Verteiler für eine hydraulische Flüssigkeit unter einem gesteuerten Druck

Verteiler, insbesondere hydraulischer Manipulator mit einem Druckregulierer (150) mit einer Bohrung (121), die einen Stößel (160) aufnimmt, der der Wirkung der Steuereinrichtung (110) und Rückstellkräften (172) ausgesetzt ist, einem Schieber (180), der dem Schub des Stößels (160) gegen die Kraft einer Ausgleichsfeder (188) ausgesetzt ist, und einem Hohlraum (123), der die Bohrung (121) vom Stößel und jenem (126) des Schiebers (160) trennt, der die Ausgleichsfeder (188) aufnimmt und mit dem Ausgang zum Reservoir (101) in Verbindung steht. Die Bohrung (121) begrenzt eine Dämpfungskammer (190), die mit Flüssigkeit gefüllt ist, wobei sich das Volumen der Kammer in Abhängigkeit von der Rückkehrbewegung des Stößels (160) verringert.

CONTROL SYSTEM FOR A HYDRAULIC LIFT

A hydraulic lift is raised by hydraulic fluid which passes through a servo valve and is lowered when the servo valve exhausts the hydraulic lift to a reservoir. The hydraulic fluid travels to and from the lift through a service line in which a blocking valve is disposed. A control unit opens the blocking valve against a spring bias in response to the application of a control pressure to a control element disposed on one side of the control unit. The control pressure is supplied via a control line which also actuates the servo valve. A branch control line branches from the control line and applies pressure to another control element which acts counter to the first-mentioned control element. The branch control line includes tow throttles between which a discharge line is connected and communicates with the reservoir.

LOAD-INDEPENDENT CONTROL DEVICE FOR HYDRAULIC USERS

HYDRAULIC TAX ARRANGEMENT

HYDRAULIC TAX ARRANGEMENT FOR MOBILES AN IMPLEMENT

HYDRAULIC TAX ARRANGEMENT

DEVICE OF HYDRAULIC DISTRIBUTION MULTIPLE

Multiple hydraulic distribution system e.g. for mobile arm and rotary turret assembly for an excavator

Dispositif de distribution hydraulique multiple (D) à détection de la pression de charge la plus élevée (LS) alimenté par une source (5) à régulation, comprenant: un premier groupe (1) de distributeurs (LS) ayant des fonctions anti-saturation et de division de débit indépendante de la charge, dont l'alimentation (P) est raccordée directement à la sortie régulée de la source (5) et dont la ligne (LS) est raccordée directement à l'entrée de régulation de la source avec un différentiel ( DELTAp) entre les pressions (P) et (LS); et un second groupe (10) de distributeurs LS dont l'alimentation (P') est raccordée à la sortie régulée de la source à travers un organe (17) générateur d'un différentiel de pression ( DELTAp') entre l'alimentation (P') et la ligne de régulation (LS') qui est indépendant du différentiel ( DELTAp), une entrée de commande de l'organe (17) recevant la pression de régulation (LS') et étant raccordée à la ligne (LS) à travers un organe anti-retour (14), ce grâce à quoi, ...

Schwenkantrieb mit Energierückgewinnung

Offenbart wird ein Schwenkantrieb einer mobilen Arbeitsmaschine mit einem Primärantrieb, durch den eine Sekundärantriebseinheit mit einem Betriebsmittel über eine Druckmittelleitung versorgt werden kann. An die Sekundärantriebseinheit ist ein Betriebsmittelspeicher angeschlossen, der im Motorbetrieb der Sekundärantriebseinheit ein gespeichertes Betriebsmittel bedarfsgerecht an die Sekundärantriebseinheit abgibt und im Pumpenbetrieb der Sekundärantriebseinheit Betriebsmittel von der Sekundärantriebseinheit aufnimmt. Erfindungsgemäß ist in der Druckmittelleitung ein Wegeventil zwischengeschaltet, über das der Betriebsmittelspeicher bei Bedarf vom Primärantrieb mit Betriebsmittel versorgt wird.

LEISTUNGSREGELVORRICTHUNG

STEUERSCHALTUNG FUER EIN HYDRAULISCHES KRAFTHEBER-REGELSYSTEM

BAG MACHINE WITH AT LEAST TWO TRANSVERSE SEAL CHEEKS

HYDRAULIC TAX ARRANGEMENT

HYDRAULIC VALVE ARRANGEMENT

Hydraulic control arrangement for a mobile equipment

What is disclosed is a hydraulic control arrangement for a mobile equipment, such as for a backhoe loader or a wheel loader, wherein a working tool of the equipment is adapted to be actuated by means of a hydraulic cylinder whose pressure chambers may jointly be connected with a hydraulic accumulator 14 for attenuating pitching oscillations of the working tool.

CONTROL SYSTEM FOR A HYDRAULIC LIFT DRIVEN BY A VARIABLE DISPLACEMENT PUMP

HYDRAULIC SKI SELECTOR VALVE

HYDRAULIC CONTROL DEVICE

DEVICE OF HYDRAULIC DISTRIBUTION MULTIPLE

Dispositif de distribution hydraulique multiple à fonction antisaturation et à division de débit indépendante de la charge, comportant plusieurs moyens distributeurs (31 - 33 ) commandant des charges respectives et associés en un empilement traversé par des lignes communes (P) d'alimentation en fluide de travail sous pression, (T) de retour du fluide de travail et (LS) de transmission de fluide de commande sous la pression de la charge la plus élevée; un moyen obturateur (10) est disposé dans la ligne LS entre un premier groupe de moyens distributeurs (31 - 35 ) pour lequel la ligne LS est raccordée d'une façon en soi connue au dispositif (7) de régulation de la pompe (5) et au moins un second groupe de moyens distributeurs pour lequel la ligne LS n'est pas raccordée à ce dispositif de régulation et les récepteurs correspondants respectifs reçoivent librement le débit de la pompe, la pression dans ces récepteurs étant la pression de la charge ou la pression déterminée par l'équilibre pression ...

Hydraulic distributor

A hydraulic distributor that has a regulating balance including a housing hollowed in the distributor body and containing coaxially a fixed central core. A tubular plunger is interposed sliding freely, coaxially, between the core and the housing and co-operates with a lateral orifice connected to a working orifice. The core and the plunger define between them an annular chamber. The plunger has a first radial annular surface subjected to the highest charge pressure (LS) and a second annular surface subjected to the pressure of the intake fluid. A central passage in the core constitutes a first orifice emerging at one end of the housing exposed to the highest charge pressure (LS). A second orifice emerges in the annular chamber and a third orifice is located opposite the other end of the housing and remains closed by the plunger as long as the charge pressure of the distributor is below the highest charge pressure (LS).

Method and hydraulic control system for supplying pressure medium to at least one hydraulic consumer

The invention relates to a hydraulic control arrangement and to a method for controlling a hydraulic consumer that comprises a pressure chamber on the input side and on the return side, said pressure chamber being connected to an adjusting pump or a tank via a valve device. The valve device is controlled by means of a control unit via which it can be adjusted in a regeneration mode, in which both pressure chambers are connected to the adjusting pump. According to the invention, the adjusting pump is pressure controlled, whereby in the regeneration mode, it is automatically switched to the normal operation in which the supply side of the pressure chamber is connected to the adjusting pump and the return side of the pressure chamber is connected to the tank when the pumping rate falls below the demand for the pressure medium.

CONTROL SYSTEM FOR A HYDRAULIC POWER LIFT DRIVEN BY A VARIABLE DISPLACEMENT PUMP

Load-independent control device for hydraulic users

A load-independent control device for hydraulic users has an initial position in which a control line transmitting a load pressure is connected with a tank. The control device has a control valve for the user and a switching valve, which can be controlled independently of the control valve, and has a cutoff position as well as a through position, in which it connects with the control line transmitting the load pressure to the tank.

CONTROL EQUIPMENT FOR AN IMPLEMENT WITH ARMS A SHOVEL HELD

HYDRAULIC TAX ARRANGEMENT

HYDRAULIC TAX ARRANGEMENT

HYDRAULIC TAX ARRANGEMENT FOR MOBILES AN IMPLEMENT

HYDRAULIC TAX ARRANGEMENT

Hydraulic fluid distributor, comprises an electric action with damped slider operation

Distributeur hydraulique équipé d'un tiroir (4) propre à coulisser dans un alésage (5) grâce à des moyens d'actionnement électriques (29) qui lui sont fonctionnellement accouplés, une extrémité du tiroir (4) débouchant dans une chambre radiale terminale (30) de l'alésage (5) et présentant une dimension transversale variable. Cette extrémité du tiroir est percée d'un canal (C) débouchant, d'un côté, sur la face extrême du tiroir, et, de l'autre côté, sur la surface latérale du tiroir, dans une chambre (26) de l'alésage raccordée avec un orifice de sortie (T) du distributeur, le canal (C) comportant au moins un étranglement calibré (35), ce grâce à quoi le déplacement du tiroir pénétrant dans la chambre est amorti par le reflux du fluide hydraulique hors de la chambre (30) à travers l'étranglement.

DISРОSIТIF DЕ DISТRIВUТIОN НYDRАULIQUЕ МULТIРLЕ

Dispоsitif dе distributiоn hуdrаuliquе multiplе (D) à détесtiоn dе lа prеssiоn dе сhаrgе lа plus élеvéе (LS) аlimеnté pаr unе sоurсе (5) à régulаtiоn, соmprеnаnt: un prеmiеr grоupе (1) dе distributеurs (LS) ауаnt dеs fоnсtiоns аnti-sаturаtiоn еt dе divisiоn dе débit indépеndаntе dе lа сhаrgе, dоnt l'аlimеntаtiоn (Р) еst rассоrdéе dirесtеmеnt à lа sоrtiе réguléе dе lа sоurсе (5) еt dоnt lа lignе (LS) еst rассоrdéе dirесtеmеnt à l'еntréе dе régulаtiоn dе lа sоurсе аvес un différеntiеl ( DЕLТАp) еntrе lеs prеssiоns (Р) еt (LS); еt un sесоnd grоupе (10) dе distributеurs LS dоnt l'аlimеntаtiоn (Р') еst rассоrdéе à lа sоrtiе réguléе dе lа sоurсе à trаvеrs un оrgаnе (17) générаtеur d'un différеntiеl dе prеssiоn ( DЕLТАp') еntrе l'аlimеntаtiоn (Р') еt lа lignе dе régulаtiоn (LS') qui еst indépеndаnt du différеntiеl ( DЕLТАp), unе еntréе dе соmmаndе dе l'оrgаnе (17) rесеvаnt lа prеssiоn dе régulаtiоn (LS') еt étаnt rассоrdéе à lа lignе (LS) à trаvеrs un оrgаnе аnti-rеtоur (14), се grâсе à quоi, ...

CONTROL FOR A LOAD-DEPENDENTLY OPERATING VARIABLE DISPLACEMENT PUMP

An electrohydraulic control for a load-dependently operating variable displacement pump (2) is equipped with a differential pressure control device (30) for ensuring a predetermined pressure drop at the control edge of a directional valve (60) integrated into the consumer supply line. The differential pressure control device comprises a servo valve, the valve spool of which is moved between first and second positions by pump output pressure against the compressive force of a spring (26) and of a control pressure led off from the supply pressure downstream of the directional valve (60). Variations in the pump output pressure and the control pressure operate the device (30) which in turn adjusts the pump (2). In order to be able to adapt the volume flow control to the different requirements of various consumers, the control pressure effective at the servo valve (30) is arbitrarily influenced by means of a separately controllable actuating device (100). <IMAGE>

Hydraulic fluid multiple distribution system

Dispositif de distribution hydraulique multiple comportant plusieurs distributeurs à régulation (LS), à fonction antisaturation et à division de débit indépendante de la charge qui sont répartis en au moins deux groupes (2, 4) avec la ligne de retour de fluide (T) du premier groupe (2) connectée à la ligne d'alimentation en fluide (P') du second groupe (4), ces deux groupes comportant respectivement deux moyens (12, 13) générateurs d'un différentiel de pression ( DELTAp, DELTAp') entre la pression d'alimentation respective (P, P') et la pression de régulation respective (LS, LS') propres à assurer la fonction de division de débit indépendante de la charge respectivement dans les deux groupes (2,4), ce grâce à quoi les deux groupes (2, 4) de distributeurs sont connectés en série.

VORSTEUERGERÄT

HYDRAULIC CONTROL CIRCUIT FOR A MOTOR VEHICLE

HYDRAULIC CONTROL CIRCUIT FOR A MOTOR VEHICLE

HYDRAULIC DISTRIBUTOR

Open centre inlet for hydraulic distributor

L'invention concerne un élément d'entrée à centre ouvert (20) pour circuit hydraulique avec fonction LS, une balance d'entrée avec un tiroir (4) soumis à un ressort de régulation (3) régulant à une valeur prédéterminée le différentiel de pression de régulation DELTAp, ce ressort (3) prenant appui sur un organe d'appui mobile (26) rappelé par un ressort (27) plus faiblement taré et apte à occuper une position de repos en l'absence de signal de pression de régulation LS, pour laquelle le ressort de régulation (3) n'est pas précontraint et le tiroir (4) établit un passage de libre circulation du fluide entre la pompe (P) et le réservoir (T), et une position de travail occupée en présence d'un signal de pression de régulation LS, pour laquelle le ressort de régulation est contraint et appuie sur le tiroir (4) en créant ainsi un différentiel de pression DELTAp entre les pressions de pompe P et de régulation LS.

Hydraulic system for the limitation of the pressures of static head and/or dynamic

L'invention concerne un circuit hydraulique pour la limitation des pressions de charge statiques et/ou dynamiques, dans un appareil utilisateur (1), au moyen d'éléments, blocs d'isolement (4) et vanne à voies multiples (3) déjà existants, dans lequel une simple soupape de limitation de pression (5) à commande directe envoie, lorsqu'est atteinte une pression maximale Pz r m a x , un signal de pression dans le circuit de pilotage d'une soupape à voies multiples (3), qui mène à l'ouverture du bloc d'isolement déverrouillable et provoque une liaison hydraulique de l'appareil utilisateur (1) avec un réservoir (8), par l'intermédiaire d'une soupape à voies multiples (5).

HYDRAULIC DISTRIBUTOR

Distributeur hydraulique comportant une balance de régulation comportant : un logement (13) évidé dans le corps du distributeur et renfermant coaxialement un noyau central fixe (30); un plongeur tubulaire (31) interposé à libre coulissement, coaxialement, entre le noyau et le logement et coagissant avec un orifice latéral (21) raccordé à un orifice de travail, le noyau et le plongeur définissant entre eux une chambre annulaire (35), le plongeur présentant une première surface annulaire radiale (37) soumise à la pression de charge la plus élevée (LS) et une seconde surface annulaire (36) soumise à la pression (P) du fluide d'admission; et un passage central (38) dans le noyau comportant un premier orifice (39) débouchant dans une extrémité (15) du logement où règne la pression de charge la plus élevée (LS), un deuxième orifice (40) débouchant dans la chambre annulaire (35) et un troisième orifice (41) situé en regard de l'autre extrémité (12) du logement et qui obturé par le plongeur tant ...

HYDRAULISCHE STEUERANORDNUNG

VENTILANORDNUNG

LOAD-INDEPENDENT CONTROL DEVICE FOR HYDRAULIC DEVICES

Procédé de réglage indépendant de grandeurs parasites de la position d'un vérin.

Le procédé de réglage est en particulier destiné à un système hydraulique central d'un tracteur, dans lequel le vérin est alimenté depuis une pompe dont on règle la pression et le débit. Après avoir effectué, à l'aide d'un capteur de position, sa conversion en un signal de réglage de position, la grandeur de réglage est amenée au dispositif de réglage proprement dit, dans lequel la grandeur de réglage est déterminée à partir d'une comparaison avec la grandeur de consigne qui est effectuée au moyen d'un régulateur monté en aval. Pour pouvoir réaliser dans la totalité de la plage de pression de charge, un comportement du circuit de réglage indépendant des grandeurs parasites agissant sur le tronçon de réglage, le signal qui est envoyé au régulateur est formé à partir de la différence entre l'écart de réglage de position et la modification dans le temps du signal de réglage de position. En choisissant des facteurs d'amplification appropriés pour le circuit de réglage, on fait disparaître l'influence ...

Fluid pressure regulation device for hydraulic remote control, has adjustment spring whose action is opposed to action of another adjustment spring that is placed in surge box mounted adjacent to free end of air slide valve

Ce dispositif comprend un corps (2) qui loge au moins un réducteur de pression (3) comportant un canal de distribution (5) qui est en relation avec une chambre de compensation (6), une conduite d'entrée (9), une conduite de sortie (10) qui est destinée à être raccordée à un dispositif à commander, un plongeur (20) qui est déplaçable en translation, un tiroir de distribution (30) comprenant une première extrémité (31) solidaire du plongeur et une deuxième extrémité (33) libre opposée à la première extrémité, une coupelle (25) qui est montée coaxiale au plongeur, et un premier ressort de régulation (35) qui est logé dans la chambre de compensation. Le dispositif comprend en outre un deuxième ressort de régulation (50) monté de manière adjacente à l'extrémité libre (33) du tiroir (30) et dont l'action est antagoniste à l'action du premier ressort de régulation (35).

Hydraulic control arrangement for the demand-feed regulated (load-sensing-regulated) hydraulic fluid supply to preferably several hydraulic consumers

A hydraulic control arrangement which is provided for the demand-feed-regulated supply of pressure medium to preferably a plurality of hydraulic consumers by proportionally adjustable directional valves. There are hydraulic pumps by which pressure medium can be conveyed in a quantity corresponding to the demand into a common inflow line leading to the directional valves. A first demand-feed regulator is assigned to the first hydraulic pump and a second demand-feed regulator to the second hydraulic pump. The two demand-feed regulators are capable of being acted upon, with the effect of increasing the pressure medium quantity discharged into the inflow line by the corresponding hydraulic pump, by a spring and, on a first active surface, by the pressure in a load-signaling line and, with the effect of reducing the pressure medium quantity discharged into the inflow line by the corresponding hydraulic pump, on a second active surface, by a pump pressure. Moreover, a nonreturn valve opening ...

Process and device for measuring the lower-link force of a tractor lifting mechanism

A process and a device for measuring the force transmitted by the lower links of a tractor lifting mechanism are described, a displacement sensor detecting a deformation, brought about by the lower-link forces, of a component fixed in a specific way to the tractor chassis. The bending bar always necessary hitherto can be omitted completely in the process according to the invention by measuring the elastic displacement of those tractor components which are located in the rigid force-flux chain between the lower links and the ground over which the tractor travels. The displacement sensor is fixed to a displacement-sensor carrier connected rigidly to a point of the tractor chassis, the distance of which from the point of articulation of the lower links is unchanged. When the displacement sensor is brought into measuring contact with the selected tractor components, the displacement sensor generates a signal, the magnitude of which corresponds to the force acting on the lower links. This process ...

Single lever hydraulic front-rear and left-right directional control for vehicle

Dispositif hydraulique de commande directionnelle d'un véhicule à l'aide d'un levier unique, comportant: un manipulateur hydraulique (1) à quatre départs avant-arrière et droite-gauche; un dispositif de sélection (4) à quatre sélecteurs (5) en pont raccordé au manipulateur et dont les sorties sont raccordées à quatre moteurs de commande arrière gauche, avant gauche et arrière droite et avant droite des organes de roulement du véhicule; un tiroir (7) à deux positions, respectivement une à liaisons directes et une à liaisons croisées, inséré dans les deux lignes d'alimentation des moteurs (6 AVG, 6 AVD ou respectivement 6 ARG, 6 ARD), une entrée (10) de commande audit tiroir étant raccordé aux sorties AVANT et ARRIERE du manipulateur, ce grâce à quoi la commande du véhicule reste rotalement ergonomique, y compris pour une rotation du véhicule sur lui-même ...

Dynamically stabilised tractor cab - is mounted on central universal joint which has sliding section for vertical movements, and damping springs at edges

The whole of the tractor cab is mounted on damped supports so that the controls and cab move at the same rate and transmit a min. of vibrations to the limbs of the driver. The cab is mounted on a central universal joint (6) and has its edges on spring dampers (3). The central universal joint is able to perform translational movements vertically, with a sliding section, and has orthogonal pivot axes.

Control system for a hydraulic lift

A control system for a hydraulic lift driven by a variable displacement pump is disclosed. It is comprised of a blocking valve which may be opened at least for lowering movement of the hydraulic lift. A control device is provided for opening and closing the blocking valve and for regulating the volumetric flow from a pump line to an operating line leading to the hydraulic lift, and the flow from the hydraulic lift to a tank line leading to a tank. In addition, a load indicating line is provided which transmits the load pressure. The control device is comprised of a servo valve with three valve positions, and is further comprised of an actuator unit which opens and closes the blocking valve. The servo valve regulates the volumetric flow to and from the hydraulic lift. The load registering line is connected to the operating line, and in the initial position of the control device the load registering line is connected via the servo valve to the tank. The middle position (blocking position) ...

LOAD-INDEPENDENT CONTROL DEVICE FOR HYDRAULIC CONSUMING DEVICES

A control device transmits hydraulic pressure from a continuously circulating pump to a hydraulic device. A pressure limiting valve communicates with the pump to exhaust the pump to reservoir when the system is in a stand-by mode. The control device includes a servo valve and a directional control valve. Movement of the latter relative to the former is possible in order to create a pressure back-up in a load indicating line which closes the pressure limiting valve, thereby increasing the pump pressure supplied to the servo valve when it is desired to initiate a working mode. Subsequent actuation of the servo valve causes hydraulic pressure to be supplied to or exhausted from the hydraulic device. Actuation of the servo valve is produced by hydraulic pressure which also communicates with the load indicating line via a one-way valve.

HYDRAULISCHE VENTILANORDNUNG

Hydraulic control system

The invention relates to a hydraulic control arrangement for supplying a pressure medium to at least one consumer. The forward line and/or the return line of the consumer comprises a distributing valve that can be continuously controlled and that has two switch positions, and a lowering brake valve that can be placed in an open position due to the pressure in the supply line. The distributing valve is in an open neutral position and can be displaced, electrically or electrohydraulically, from said neutral position into the direction of the second switch position thereof.

Hydraulic control system

What is disclosed is a hydraulic control system for controlling a hydraulic consumer actuating a working tool of a mobile equipment that is provided with oscillation damping means for attenuating oscillations during braking of the working tool. In accordance with the invention, the oscillation damping means comprise two pilot-controlled shut-off valves arranged in opposite directions, that are positioned in a connecting line between a pressure medium supply and a pressure medium drain. The shut-off valves are subjected to the pressure in the drain and in the delivery, respectively, in the opening direction, and also to this pressure and to the force of a spring in the closing direction. Following a predetermined initial stroke of a regulator of the control system, the pressure acting on the drain-side shut-off valve in the closing direction may be reduced, so that the latter is opened by the pressure in the drain, and the connecting line between delivery and return is opened.

Schlauchbeutelmaschine mit zumindest zwei Quersiegelbacken

Hydraulic control system used for working machine e.g. mini excavators, has pressure reduction device for high load pressure, which is more adjusted in dependence of controlled volumetric flow of adjuster of the hydraulic pump

The hydraulic control system has an adjustable hydraulic pump (2) via which the pressure medium is supplied to hydraulic load. A pumping controller (32) is provided for controlling the volumetric flow of an adjuster (36) of the hydraulic pump in dependence of supply pressure or highest load pressure of the hydraulic load. A pressure reduction device (56) for high load pressure is more adjusted in dependence of controlled volumetric flow.

Hydraulic control system for mobile equipment

What is disclosed is a hydraulic control system for a mobile equipment, in particular for a wheel or backhoe loader, wherein a shovel is linked to a boom. The angular position of the shovel may be kept constant through the intermediary of an orientation control device during a pivoting movement of the boom relative to the axles of the equipment. In accordance with the invention, the orientation control device is realized such that in the event of a change of a pre-set angular position, a control signal is generated through a pilot control device, whereby a shovel control unit may be controlled in such a manner that the shovel is again returned into its predetermined angular position.

HYDRAULIC CONTROL SYSTEM

The invention relates to a hydraulic control arrangement for supplying a pressure medium to at least one consumer. The forward line and/or the return line of the consumer comprises a distributing valve that can be continuously controlled and that has two switch positions, and a lowering brake valve that can be placed in an open position due to the pressure in the supply line. The distributing valve is in an open neutral position and can be displaced, electrically or electrohydraulically, from said neutral position into the direction of the second switch position thereof.

HYDRAULISCHE STEUERANORDNUNG FÜR EIN MOBILES ARBEITSGERÄT

HYDRAULISCHE STEUERANORDNUNG FÜR EIN MOBILES ARBEITSGERÄT

HYDRAULISCHE STEUERANORDNUNG

HYDRAULISCHES WEGEVENTIL

Distributor device

A device (10) for the distribution of bulk or piece goods possesses, according to the invention, a container (12), the bottom (16) of which has slipping surfaces (18) with perforations (22) and a deflecting hub (18) or a steep limitation (78) and which is seated on a vibrator (76). An upper part (50) open at the top and bottom projects contactlessly into the container and rests on columns (44) or weighing cells (64). The distance (h) between the lower edge (60) of the upper part and the container bottom (16) can be adjusted by hand or motively, in order to set, as required, the flow cross-section for the goods which are introduced through the upper part (50), are distributed via the container (12) and are discharged by conveying channels (24). Control can take place in dependence on the measured value of at least one filling-level indicator (62, 64). ...

HYDRAULISCHE STEUERVORRICHTUNG

FAHRZEUG MIT EINEM GELENKIG BEFESTIGTEN ANBAUGERAET

Hydraulic pilot control unit

A hydraulic pilot control unit includes at least one pressure control valve that can be controlled by means of an actuating device. The pressure control valve includes a control piston connected to a stem by means of a neck. The stem has a resilient operative connection to the actuating device. The neck is fastened to the stem. Thus, the mass of the control piston, which tends to oscillate, is reduced compared to the prior art.

Valve assembly

A valve assembly for load pressure-independent control of consumers is disclosed, which includes a main valve having a directional element and a metering throttle part. The valve assembly includes a shut-off valve for leakage-free shutting off of a work line leading to the consumer. This shut-off valve is designed with a pilot valve whereby a pressure chamber of the shut-off valve acting in the closing direction may be relieved towards a tank or a low-pressure source. The pilot valve is, in accordance with the invention, controlled open by a main slide of the main valve.

HYDRAULISCHE STEUERANORDNUNG ZUR BEDARFSTROMGEREGELTEN (LOAD-SENSING-GEREGELTEN) DRUCKMITTELVERSORGUNG VON VORZUGSWEISE MEHREREN, HYDRAULISCHEN VERBRAUCHERN

Steueranordnung und Steuerventil für eine derartige Steueranordnung

Offenbart ist eine hydraulische Steueranordnung zum Steuern von zumindest einem Verbraucher. Die Steueranordnung bildet hierbei ein Open-Center-System aus. Für den zumindest einen Verbraucher ist ein Steuerventil vorgesehen, über das sich ein Umlaufströmungspfad erstreckt. Dieser ist einerseits an einer Hydropumpe und andererseits an einen Tank angeschlossen. An die Hydropumpe ist der Umlaufströmungspfad über eine Pilotblende angeschlossen, die somit zwischen der Hydropumpe und dem Steuerventil vorgesehen ist. Steuert das Steuerventil den Verbraucher über eine Zumessblende an, so wird gleichzeitig der Umlaufströmungspfad zugesteuert und zusätzlich eine Verbindung zwischen dem Umlaufströmungspfad und dem Verbraucher stromabwärts der Zumessblende aufgesteuert. Über einen Differenzdruckregler wird dann eine Druckdifferenz über die Pilotblende und die Zumessblende konstant gehalten, womit ein Fluidvolumenstrom zum Verbraucher lastdruckunabhängig über die Zumessblende variierbar ist.

HYDRAULISCHE STEUERANORDNUNG

HYDRAULISCHES WEGEVENTIL

HYDRAULISCHE STEUERANORDNUNG

Ventilanordnung für eine mobile Arbeitsmaschine

Offenbart ist eine Ventilanordnung für eine mobile Arbeitsmaschine mit einem Zumess- bzw. Steuerventil, über das ein regenerierbarer Anschluss und ein weiterer Anschluss eines Verbrauchers – z. B. Arbeitszylinder oder Motor – der mobilen Arbeitsmaschine versorgbar sind. Es ist ein – vorzugsweise gesondertes – Regenerationsventil mit nur zwei Schaltstellungen (ganz offen; ganz geschlossen) vorgesehen, über das Druckmittel vom regenerierbaren Anschluss in einen Tank ableitbar ist. Oberhalb einer vorgegebenen Druckdifferenz zwischen den Anschlüssen ist das Regenerationsventil offen und im Übrigen geschlossen. Ein Haupt- bzw. Steuerschieber des Steuerventils weist eine gemeinsame Regenerations- und Arbeitsstellung auf. Der Steuerschieber hat also keine entlang eines Verschiebeweges des Steuerschiebers von der Regenerationsstellung beabstandete Arbeitsstellung, so dass kein aktives Umschalten zwischen Arbeitsbetrieb und Regernationsbetrieb nötig ist. Disclosed is a valve arrangement for a mobile work machine with a metering or control valve, via which a regenerable connection and a further connection of a consumer -. B. cylinder or motor - the mobile machine can be supplied. There is a - preferably separate - regeneration valve with only two switch positions (fully open, fully closed) provided over the pressure medium from the regenerable connection in a tank can be derived. Above a predetermined pressure difference between the terminals, the regeneration valve is open and otherwise closed. A main or spool of the control valve has a common regeneration and working position. The spool thus has no along a displacement path of the spool from the regeneration position spaced working position, so that no active switching between working and Regernationsbetrieb is necessary.

DISTRIBUTOR OF HYDRAULIC FLUID UNDER CONTROL PRESSURE

The present invention provides a distributor of hydraulic fluid under a control pressure, capable of attenuating oscillation or vibration of a control lever or pedal. According to the present invention, a hydraulic operator comprises: an inner diameter (121) to receive a plunger (16) to which action and return power (171) of a control mechanism (110) are applied; a slide (180) to receive thrust of the plunger (160) with respect to a force of a correction spring (188); and a pressure controller (150) to space the inner diameter (121) of the plunger and the inner diameter (126) of the slide (180), to receive the correction spring (188), and having an axial cavity (123) to communicate with an outlet facing a storage (101). The inner diameter (121) restricts a damping chamber (190) filled with hydraulic liquid and the volume of the damping chamber is decreased in accordance with return motion of the plunger. COPYRIGHT KIPO 2017 ...

Hydraulic Control System

The invention relates to a hydraulic control system for providing at least one hydraulic consumer with a pressure medium. Said system comprises an LS pump system and a metering port for adjusting the pressure medium volume flow rate towards the consumer. The LS line is connected to a pressure medium sink via a current regulator. The invention is characterized in that the current regulator can be adjusted depending on the pump rate in order to modify the pressure drop at the metering port.

Hydraulic multiple distributor device

The several distributor devices (3/1-3/5) are intended for the control of corresponding loads and are arranged side by side in a stack. The stack is penetrated by a common conduit (P) for supply of a work fluid under pressure originating from a source which comprises a pump (6) for a device for throughput pressure regulation (7). Also provided are a common conduit (T) for back flow of the work fluid to a reservoir and a common conduit (LS) for transmission of control fluid under the pressure of the highest load to the device for regulating the pump. A closure device (10) is arranged in the conduit between a first group of distributor devices (3/1-3/3), for which the conduit is connected with the device for regulating the source, and at least one second group of distributor devices for which the conduit is not connected with the device for regulating the source.

STEUEREINRICHTUNG FÜR EIN ARBEITSGERÄT MIT EINER AUSLEGER GEHALTENEN SCHAUFEL

Valve arrangement

A valve assembly for load pressure-independent control of consumers is disclosed, which includes a main valve having a directional element and a metering throttle part. The valve assembly includes a shut-off valve for leakage-free shutting off of a work line leading to the consumer. This shut-off valve is designed with a pilot valve whereby a pressure chamber of the shut-off valve acting in the closing direction may be relieved towards a tank or a low-pressure source. The pilot valve is, in accordance with the invention, controlled open by a main slide of the main valve.

Hydraulic control system

The invention relates to a hydraulic control system for providing at least one hydraulic consumer with a pressure medium. Said system comprises an LS pump system and a metering port for adjusting the pressure medium volume flow rate towards the consumer. The LS line is connected to a pressure medium sink via a current regulator. The invention is characterized in that the current regulator can be adjusted depending on the pump rate in order to modify the pressure drop at the metering port.

Hydraulic control arrangement

A hydraulic control arrangement is disclosed for the load-independent control of a consumer with a continuously adjustable distribution valve having a pressure compensator down the line. According to the invention, the pressure compensator has a single-sided damping such that the movement in the opening direction is damped and the movement in the closing direction is substantially undamped. Furthermore, a control arrangement is disclosed in which a load-holding function is integrated in the pressure compensator.

Hydraulic Pilot Control Unit

A hydraulic pilot control unit includes at least one pressure control valve that can be controlled by means of an actuating device. The pressure control valve includes a control piston connected to a stem by means of a neck. The stem has a resilient operative connection to the actuating device. The neck is fastened to the stem. Thus, the mass of the control piston, which tends to oscillate, is reduced compared to the prior art. 1. A hydraulic pilot control unit comprising:at least one pressure-regulating valve, which can be controlled by way of an actuating device and which comprises a control piston, which is connected to a tappet by way of a neck,wherein the tappet is operatively connected to the actuating device, andwherein the neck is fixed to the tappet.2. The hydraulic pilot control unit as claimed in claim 1 , wherein each control piston is composed substantially of aluminum or plastic.3. The hydraulic pilot control unit as claimed in claim 1 , wherein:each tappet and the associated control piston can be displaced by the actuating device in an opening direction of the control piston, anda shear-elastic connection is provided between each neck and the associated control piston.4. The hydraulic pilot control unit as claimed in claim 3 , wherein:each shear-elastic connection has a regulating spring, which is supported against the tappet and which biases the control piston in an opening direction, anda head, which is fixed to an end portion of the neck and is inserted into a recess formed on a first end portion of the control piston, and is displaceable therein in an opening direction.5. The hydraulic pilot control unit as claimed in claim 4 , wherein each head can be brought into bearing contact with an end face of the recess when the associated tappet is displaced in an opening direction.6. The hydraulic pilot control unit as claimed in claim 1 , wherein each pressure-regulating valve has a return spring claim 1 , which is supported against a housing of the ...

HYDRAULIC VALVE ASSEMBLY

The invention relates to a hydraulic valve arrangement which is used, in particular, for a mobile machine and which has a valve housing (10) having a feed channel (34), having an outlet channel (42) and having a consumer channel (39) and has a valve bore (11) which cuts into the channels. In the valve bore (11), a valve slide (12) can be moved axially from a neutral position in at least one direction into a working position, by way of which valve slide (12) the fluidic connections between the channels can be controlled. Moreover, there is a pressure-relief and feed valve (45, 47), by way of which the pressure in the consumer channel (39) can be limited by throttled discharge of pressure fluid into the outlet channel (42) and pressure fluid can be fed from the outlet channel (42) into the consumer channel (39). The invention is based on the object of designing a hydraulic valve arrangement of this type in such a way that low manufacturing costs and a small overall size are possible. According ...

Hydraulic control device

A hydraulic control device according to the invention is of load-sensing design and serves to actuate a first hydraulic load and a second hydraulic load. Also provided are a first control valve for actuating the first hydraulic load and a second control valve for actuating the second hydraulic load. A first load signal can be measured on the basis of a load pressure with which the first hydraulic load is acted on, and a second load signal can be measured on the basis of a load pressure with which the second hydraulic load is acted on. Pressure medium from a pressure medium source can be supplied in parallel to the first control valve and to the second control valve. A load signal path can, in order to actuate an adjusting element which is assigned to the pressure medium source, be acted on with a highest presently measured load signal. A limiting device allows the second load signal to be limited to a predefined signal limit value. A switching means can be actuated by means of the second ...

Hydraulic control system

What is disclosed is a hydraulic control system for controlling a hydraulic consumer actuating a working tool of a mobile equipment that is provided with oscillation damping means for attenuating oscillations during braking of the working tool. In accordance with the invention, the oscillation damping means comprise two pilot-controlled shut-off valves arranged in opposite directions, that are positioned in a connecting line between a pressure medium supply and a pressure medium drain. The shut-off valves are subjected to the pressure in the drain and in the delivery, respectively, in the opening direction, and also to this pressure and to the force of a spring in the closing direction. Following a predetermined initial stroke of a regulator of the control system, the pressure acting on the drain-side shut-off valve in the closing direction may be reduced, so that the latter is opened by the pressure in the drain, and the connecting line between delivery and return is opened.

Hydraulic control system for mobile equipment

What is disclosed is a hydraulic control system for a mobile equipment, in particular for a wheel or backhoe loader, wherein a shovel is linked to a boom. The angular position of the shovel may be kept constant through the intermediary of an orientation control device during a pivoting movement of the boom relative to the axles of the equipment. In accordance with the invention, the orientation control device is realized such that in the event of a change of a pre-set angular position, a control signal is generated through a pilot control device, whereby a shovel control unit may be controlled in such a manner that the shovel is again returned into its predetermined angular position.

Hydraulic control device

The invention relates to a hydraulic control device for a priority, first hydraulic consumer and a subordinate, second hydraulic consumer, pressure medium being deliverable to the first or the second consumer via a first or a second metering diaphragm. A pressure scale which allows a constant pressure difference to be adjusted above the first metering diaphragm is mounted upstream from the first metering diaphragm. For this purpose, said pressure scale is provided with a valve piston encompassing a first control edge, by means of which a first flow area between a feeding duct and the first metering diaphragm can be controlled.; A second pressure scale which can be impinged upon in the closing direction by control pressure prevailing in a control chamber while being impinged upon in the opening direction by the pressure applied downstream from the second measuring diaphragm is mounted downstream from the second measuring diaphragm. A variable delivered amount of pressure medium source can ...

Hydraulic control arrangement for a mobile equipment

Hydraulic control arrangement for a mobile equipment What is disclosed is a hydraulic control arrangement for a mobile equipment, such as for a backhoe loader or a wheel loader, wherein a working tool of the equipment is adapted to be actuated by means of a hydraulic cylinder whose pressure chambers may jointly be connected with a hydraulic accumulator 14 for attenuating pitching oscillations of the working tool.

Hydraulic control system for a mobile piece of equipment

What is disclosed is a control arrangement for an equipment, in particular a wheel loader or a backhoe loader having a shovel mounted articulatedly at a boom, wherein the control arrangement enables a control of the shovel by means of a control pressure of a boom control unit, so that the latter may be taken into a target position during lowering of the boom or while the boom is taken into a floating condition.

Hydraulic control arrangement

A hydraulic control arrangement includes a common variable displacement pump configured to supply pressure medium to two consumer groups. The pressure level of a control block assigned to one of the consumer groups is set to a different pressure level than that of a further control block assigned to the other consumer group.

Control device for a work device comprising a scoop held on an extension arm

On a work appliance, an extension arm is held rotatably, and a scoop is held rotatably on the extension arm. Actuation of the extension arm and of the scoop is by means of hydraulic cylinders. Each cylinder is assigned a valve which controls the flow of pressure medium from a pump to the cylinder and from the latter to the tank. A rotational movement of the extension arm is accomplished with the top edge of the scoop maintaining its angular position when the extension arm is being raised or lowered. Valves which control the flow of pressure medium to the cylinders are activated with the ratio of the pressure medium quantities supplied to the cylinders being kept at a constant value independently of the size of the control signal controlling the flow of pressure medium to a cylinder for the actuation of the extension arm.

Hydraulic control arrangement

A hydraulic control arrangement is disclosed for the control of a consumer, comprising at least one mechanically operated continuously adjustable distribution valve with a subsequent LUDV pressure compensator down the line. In order to lock the consumer the control arrangement is provided with a spring holding the pressure compensator piston in a closed position. Furthermore, the LS line carrying the highest load pressure of all consumers is connected to a reservoir by means of a flow regulator, wherein the pump control may also be relieved by the flow regulator in the sense of a reduction of the pumped volume. According to the invention, the LUDV pressure compensator is pressure-compensated by means of a nozzle through which a connection between the LS line and a portion of the pressure medium flow path downstream of the pump and upstream of the outlet of the pressure compensator is generated. Said nozzle is preferably integrated in the pressure compensator piston.

Hydraulic control arrangement

A hydraulic control arrangement is disclosed for the load pressure independent control of a consumer, comprising a distribution valve forming an inlet metering orifice, a corresponding individual pressure compensator, a stop valve provided for each consumer connection which may be released by means of a pilot valve and an anti-cavitation valve by means of which pressure medium can be drawn from a reservoir to avoid cavitation. According to the invention, the distribution valve and the stop valves are arranged along two parallel axes, while the axes of the two pilot valves are arranged perpendicularly to these two axes. The anti-cavitation valves in turn extend perpendicularly to the axes of the distribution valves, the stop valves and the anti-cavitation valves.

Control device for a work device comprising a scoop held on an extension arm

On a work appliance, an extension arm is held rotatably, and a scoop is held rotatably on the extension arm. The actuation of the extension arm and of the scoop takes place in each case by means of a hydraulic cylinder. Each cylinder is assigned a valve which controls the flow of pressure medium from a pump to the cylinder and from the latter to the tank. A rotational movement of the extension arm entails a change in the angular position of the top edge of the scoop, this change having an adverse effect during the raising of the extension arm, particularly when the scoop is full. So that the top edge of the scoop maintains its angular position when the extension arm is being raised or lowered, the valves which control the flow of pressure medium to the cylinders can be activated in such a way that the ratio of the pressure medium quantities supplied to the cylinders is kept at a constant value independently of the size of the control signal controlling the flow of pressure medium to the ...

Hydraulic control assembly

A hydraulic control assembly, in particular for controlling hydraulic consumers of a mobile machine, includes a load reporting line (26) that can be subjected to the highest load pressure of a plurality of hydraulic consumers, triggered simultaneously each via a respective main control valve (38, 57), and that is connectable by an end portion (26a) to a pump regulator (25). A pressure limiting valve (50) limits the control pressure in the end portion (26a) of the load reporting line (26). The pressure limiting valve (50) is adjustable as a function of the magnitude of a pilot control signal serving to trigger a main control valve (38, 57).

Hydraulic control device

The invention relates to a hydraulic control device for a priority, first hydraulic consumer and a subordinate, second hydraulic consumer, pressure medium being deliverable to the first or the second consumer via a first or a second metering diaphragm. A pressure scale which allows a constant pressure difference to be adjusted above the first metering diaphragm is mounted upstream from the first metering diaphragm. For this purpose, said pressure scale is provided with a valve piston encompassing a first control edge, by means of which a first flow area between a feeding duct and the first metering diaphragm can be controlled. A second control edge which allows a second flow area to be controlled between the feeding duct and a load signaling line is provided on the valve piston of the first pressure scale.

Pilot device

What is disclosed is a pilot apparatus whereby at least two mechanically operable control valves and two electrically or electro-hydraulically operable control valves may be driven. The pilot apparatus comprises a pivoted lever having two handles, on each of which a switching element for driving the electrically/electro-hydraulically operable control valves is provided.

METHOD AND HYDRAULIC CONTROL SYSTEM FOR SUPPLYING PRESSURE MEDIUM TO AT LEAST ONE HYDRAULIC CONSUMER

The invention relates to a hydraulic control arrangement and to a method for controlling a hydraulic consumer that comprises a pressure chamber on the input side and on the return side, said pressure chamber being connected to an adjusting pump or a tank via a valve device. The valve device is controlled by means of a control unit via which it can be adjusted in a regeneration mode, in which both pressure chambers are connected to the adjusting pump. According to the invention, the adjusting pump is pressure controlled, whereby in the regeneration mode, it is automatically switched to the normal operation in which the supply side of the pressure chamber is connected to the adjusting pump and the return side of the pressure chamber is connected to the tank when the pumping rate falls below the demand for the pressure medium.

Hydraulic control system for a mobile piece of equipment

Hydraulic control arrangement for a mobile equipment What is disclosed is a control arrangement for an equipment, in particular a wheel loader or a backhoe loader having a shovel mounted articulatedly at a boom, wherein the control arrangement enables a control of the shovel by means of a control pressure of a boom control unit, so that the latter may be taken into a target position during lowering of the boom or while the boom is taken into a floating condition.

HYDRAULIC CONTROL ARRANGEMENT

A hydraulic control arrangement includes a common variable displacement pump configured to supply pressure medium to two consumer groups. The pressure level of a control block assigned to one of the consumer groups is set to a different pressure level than that of a further control block assigned to the other consumer group. 1. A hydraulic control arrangement with , comprising:a variable displacement pump configured to supply pressure medium to two consumer groups, to which a control block is assigned in each case, the variable displacement pump being adjustable as a function of a control pressure,wherein the control pressure level in one of the control blocks is limited by a pressure-limiting valve, andwherein a pressure-limiting valve assigned to the other control block is configured to limit the control pressure level to a value different from the first pressure-limiting valve.2. The control arrangement as claimed in claim 1 , wherein the control blocks are any desired pairing of identical or different control blocks from the following group of throttle control blocks: LUDV control blocks and LS control blocks.3. The control arrangement as claimed in claim 2 , wherein the throttle control block is configured in the open-center type of construction with a control line being connected to a tank in a basic position.4. The control arrangement as claimed in claim 3 , wherein the control blocks are connected in series with their control lines claim 3 , the control pressure in the control block adjacent to the variable displacement pump in the flow direction being limited to a higher value than the control pressure of the other control block.5. The control arrangement as claimed in claim 4 , wherein the control lines of the control blocks are connected to one another via a non-return valve.6. The control arrangement as claimed in claim 3 , wherein the control blocks are connected in parallel with their control lines.7. The control arrangement as claimed in claim 6 , ...

Patent DE3000606C2

CONTROL CIRCUIT FOR A HYDRAULIC LIFTER OPERATED BY A VARIABLE FLOW PUMP

CONTROL CIRCUIT FOR A HYDRAULIC LIFTER OPERATED BY A VARIABLE FLOW PUMP

HYDROSTATIC POWER STEERING FOR VEHICLES

Une direction assistée de véhicule présente un servomécanisme commandant la force d'un vérin de direction et il est prévu un circuit de réglage pour régler une quantité d'huile proportionnelle à la rotation du volant. Une pompe manuelle 18 entraînée par le volant 26 est branchée en parallèle à ce circuit 16, 14, 10, 28, 22, 24. De cette manière on peut choisir le rapport de transmission de la pompe manuelle indépendamment de l'adaptation du circuit de réglage de la force auxiliaire, de sorte que le véhicule demeure orientable dans tous les états de fonctionnement. De plus, il en résulte la possibilité de configurer le circuit de réglage de force auxiliaire à réaction externe de façon que les grandeurs perturbatrices d'un système asservi affectant la soupape de direction, les vérins de direction et la cinématique de direction puissent être éliminées par réglage. A vehicle power steering has a servomechanism controlling the force of a steering cylinder and an adjustment circuit is provided for adjusting an amount of oil proportional to the rotation of the steering wheel. A manual pump 18 driven by the flywheel 26 is connected in parallel to this circuit 16, 14, 10, 28, 22, 24. In this way it is possible to choose the transmission ratio of the manual pump independently of the adaptation of the control circuit. adjustment of the auxiliary force, so that the vehicle remains steerable in all operating states. In addition, this results in the possibility of configuring the external feedback auxiliary force adjustment circuit so that the disturbing quantities of a servo system affecting the steering valve, steering cylinders and steering kinematics can be eliminated by setting.

HYDROSTATIC POWER STEERING FOR VEHICLES

Hydraulic distributor

The invention concerns a hydraulic distributor comprising a regulating balance including: a housing (13) hollowed in the distributor body and containing coaxially a fixed central core (30); a tubular plunger (31) interposed sliding freely, coaxially, between the core and the housing and co-operating with a lateral orifice (21) connected to a working orifice, the core and the plunger defining between them an annular chamber (35), the plunger having a first radial annular surface (37) subjected to the highest charge pressure (LS) and a second annular surface (36) subjected to the pressure (P) of the intake fluid; and a central passage (38) in the core comprising a first orifice (39) emerging in one end (15) of the housing where prevails the highest charge pressure (LS), a second orifice (40) emerging in the annular chamber (35) and a third orifice (41) located opposite the other end (12) of the housing and which is closed by the plunger as long as the charge pressure of the distributor does not constitute the highest charge pressure (LS).

Control system for a hydraulic lift driven by a variable displacement pump

A control system for a hydraulic lift driven by a variable displacement pump is disclosed. It is comprised of a blocking valve which may be opened at least for lowering movement of the hydraulic lift. A control device is provided for opening and closing the blocking valve and for regulating the volumetric flow from a pump line to an operating line leading to the hydraulic lift, and the flow from the hydraulic lift to a tank line leading to a tank. In addition, a load indicating line is provided which transmits the load pressure. The control device is comprised of a servo valve with three valve positions, and is further comprised of an actuator unit which opens and closes the blocking valve. The servo valve regulates the volumetric flow to and from the hydraulic lift. The load registering line is connected to the operating line, and in the initial position of the control device the load registering line is connected via the servo valve to the tank. The middle position (blocking position) of the servo valve is next to the initial position of said servo valve, and in turn a third valve position is next to the blocking position [of said valve] and serves to connect the operating line to the pump.

LOAD INDEPENDENT CONTROL DEVICE FOR HYDRAULIC USER DEVICES

Un dispositif de commande comporte une unité de commande et une soupape à voies multiples, qui est susceptible d'être commandée indépendamment de l'unité de commande. Une ligne de commande commune 94 est susceptible d'être alimentée par la pression de la pompe et est reliée par une soupape antiretour 100, 96 à la ligne de commande 40 laissant passer la pression de charge XL S , qui est reliée au côté commande d'une soupape de limitation de pression 60 servant à la pression de circulation de la pompe. A control device comprises a control unit and a multi-way valve, which can be controlled independently of the control unit. A common control line 94 is capable of being supplied by the pressure of the pump and is connected by a non-return valve 100, 96 to the control line 40 passing the charge pressure XL S, which is connected to the control side d a pressure limiting valve 60 for the circulation pressure of the pump.

Bag forming, filling and sealing machine with at least two transversal sealing devices

Hydraulic control circuit for a trailer brake valve

A hydraulic control circuit for one or more consumers, to have priority of supply, is described such as, for example, for a trailer brake valve, which is supplied by a pump by way of a priority valve, which pump is also used for supplying at least one additional secondary consumer. The supply line for the secondary consumer branches off downstream of the priority valve and a pressure governor, which is actuated by the pressure in the trailer brake line in such a way that, in the event of simultaneous operation of secondary consumer and brake, the pressure governor is modulated in the closing direction, is assigned to each secondary consumer.

CONTROL CIRCUIT FOR A HYDRAULIC CYLINDER WORKING WITH A VARIABLE FLOW PUMP.

Il présente une clapet d'arrêt débloqué pour effectuer les mouvements d'abaissement du vérin, avec un dispositif de commande mettant en et hors circuit le clapet d'arrêt et une conduite d'information de charge. L'unité de réglage (70) comporte deux côtés de commande (74,76) agissant en sens opposé, dont celui (76) qui sollicite la clapet d'arrêt (60) en direction de la fermeture est déchargé en pression lorsqu'on se trouve dans les positions finales (B;D) de la servovalve (10). Un dispositif d'équilibrage de pression (84,10,82,86,88) est prévu et veille, en position (C), à ce que les pressions puissent s'équilibrer des deux côtés de commande (74,76), avec un retard temporel. It has an unblocked shut-off valve to perform the lowering movements of the cylinder, with a control device switching the shut-off valve on and off and a load information line. The adjustment unit (70) has two control sides (74,76) acting in opposite directions, of which the one (76) which urges the shut-off valve (60) in the direction of closing is released under pressure when is in the end positions (B; D) of the servovalve (10). A pressure balancing device (84,10,82,86,88) is provided and ensures, in position (C), that the pressures can be balanced on both control sides (74,76), with a time delay.

Patent DE3432159C2

REGULATION FOR A VARIABLE CYLINDER PUMP ACCORDING TO THE LOAD

La régulation comporte un dispositif de réglage de la pression différentielle, pour assurer une perte de charge prédéterminée sur au moins un bord de commande d'une vanne de distribution insérée dans la conduite d'alimentation des récepteurs. Le dispositif de réglage de la pression différentielle comporte une vanne pilote 30 dont l'obturateur peut être amené, à l'encontre de la pression d'un ressort 26 et d'une pression de commande, dérivée de la pression d'alimentation en aval de la vanne de distribution, par la pression de la pompe en amont de la vanne de distribution, d'une première position augmentant le volume déplacé de la pompe à cylindrée variable, dans une deuxième position réduisant ce volume. La pression de commande, agissant sur la vanne pilote 30 peut être volontairement influencée au moyen d'un dispositif de positionnement commandé séparément. The regulation comprises a device for adjusting the differential pressure, to ensure a predetermined pressure drop on at least one control edge of a distribution valve inserted in the supply line of the receivers. The device for adjusting the differential pressure comprises a pilot valve 30, the shutter of which can be brought, against the pressure of a spring 26 and a control pressure, derived from the downstream supply pressure of the distribution valve, by the pressure of the pump upstream of the distribution valve, from a first position increasing the displaced volume of the variable displacement pump, in a second position reducing this volume. The control pressure acting on the pilot valve 30 can be deliberately influenced by means of a separately controlled positioning device.

HYDRAULIC CONTROL DEVICE.

Dispositivo de control hidráulico para un primer consumidor hidráulico principal (14) y para un segundo consumidor hidráulico secundario (15), con un primer orificio de estrangulación (17) a través del cual se pueden conducir medios de presión al primer consumidor hidráulico (14), y un regulador de presión (45), conectado previamente al primer orificio de estrangulación (17), con el que se puede ajustar una diferencia de presión constante sobre el primer orificio de estrangulación (17) y que a tal efecto presenta un émbolo de válvula (48) con un primer reborde regulador (77) que sirve para controlar una primera sección de paso entre un conducto de alimentación (13) y el primer orificio de estrangulación (17), con un segundo orificio de estrangulación (31) a través del cual se pueden conducir medios de presión al segundo consumidor hidráulico (15) y al que se encuentra conectado posteriormente un segundo regulador de presión (30) que puede ser sometido, en la dirección de cierre, a una presión de control existente en una cámara de control (34), y, en dirección de apertura, a la presión existente después del segundo orificio de estrangulación (31), con una fuente de medio de presión (10) de caudal variable que, dependiendo de la presión de carga más alta de los consumidores hidráulicos accionados (14, 15), se puede controlar de manera tal, que la presión en el conducto de alimentación (13) se encuentre por encima de la presión de carga más alta, en una diferencia de presión determinada, y con un conducto de detección de carga (38), que puede ser sometido a la presión de carga del segundo consumidor hidráulico (15) o a una presión derivada del mismo, y que se encuentra conectado con la cámara de control (34) del segundo regulador de presión (30) así como con un elemento de regulación (11) de la fuente de medio de presión (10), caracterizado porque en el émbolo de válvula (48) del primer regulador de presión (45) se encuentra previsto un segundo reborde regulador (79) ...

MULTIPLE HYDRAULIC DISTRIBUTION DEVICE

Device for damping the self-movements of the masses of a linear two-mass oscillator

A description is given of a device for damping the self-movements of the masses of a linear two-mass oscillator such as that which is present, for example, in a wheel-suspension system of a motor vehicle with two spring-damper systems connected in series. The spring-damper system arranged between the two masses is assigned a controller, the actuating signal of which influences the transmission behaviour of a controlled damping member in such a way that the damping force is proportional to the sum of the separately weighted absolute velocities of the two masses. In this way, it is possible to raise the oscillation screening of the two spring-damper systems in the frequency range between the natural frequencies of the two systems and to reduce the thermal loading of the damping member.

Hydraulic control arrangement for the demand-feed regulated (load-sensing-regulated) hydraulic fluid supply to preferably several hydraulic consumers

The invention relates to a hydraulic control arrangement for the demand-feed regulated hydraulic fluid supply of preferably several hydraulic consumers which are provided with proportionally adjustable directional control valves (12). A required amount of hydraulic fluid can be delivered by two hydraulic pumps (30, 31) via a common supply line leading to the directional control valves. A first demand-feed regulator (45) is associated with the first hydraulic pump (30) and a second demand-feed regulator (46) is associated with the second hydraulic pump (31). A return valve (36) which opens into the feed line is mounted between the first hydraulic pump (30) and the feed line (26). According to the invention, a return valve (37) that opens into the feed line (26) is also arranged between the second hydraulic pump (31) and the feed line (26). Means (90, 91, 95, 96) for regulating the power use of the demand-feed regulator (45, 46) are provided, whereby said means can be modified in such a way that the hydraulic consumers can be exclusively supplied with hydraulic fluid by the first hydraulic pump (30) or the second hydraulic pump (31).

LOAD INDEPENDENT CONTROL DEVICE FOR HYDRAULIC USER DEVICES

HYDROSTATIC POWER STEERING FOR VEHICLES

MULTIPLE HYDRAULIC DISTRIBUTION DEVICE

Blocking valve control system for lift driven by variable displacement pump

A hydraulic lift is raised by hydraulic fluid which passes through a servo valve and is lowered when the servo valve exhausts the hydraulic lift to a reservoir. The hydraulic fluid travels to and from the lift through a service line in which a blocking valve is disposed. A control unit opens the blocking valve against a spring bias in response to the application of a control pressure to a control element disposed on one side of the control unit. The control pressure is supplied via a control line which also actuates the servo valve. A branch control line branches from the control line and applies pressure to another control element which acts counter to the first-mentioned control element. The branch control line includes tow throttles between which a discharge line is connected and communicates with the reservoir.

CONTROL CIRCUIT FOR A HYDRAULIC LIFTER OPERATED BY A VARIABLE FLOW PUMP

Le circuit comporte des premiers organes de réglage de l'unité de commande 30 et de la servovanne 10 sollicités par une conduite de commande commune (pression x2 ). A partir de la conduite de commande commune 35, il est dérivé une conduite de commande de dérivation 60 qui est guidée vers un organe de réglage 42 supplémentaire de l'unité de commande 30, agissant en s'opposant au premier organe de réglage 33, et présentant deux étranglements 43, 44 entre lesquels est dérivée une conduite de décharge 62 allant au réservoir T, qui est obturée lorsque la servovanne 10 se trouve en position centrale C. The circuit comprises first regulators of the control unit 30 and of the servo valve 10 urged by a common control line (pressure x2). From the common control line 35, a bypass control line 60 is derived which is guided to an additional adjustment member 42 of the control unit 30, acting in opposition to the first adjustment member 33, and having two constrictions 43, 44 between which is derived a discharge pipe 62 going to the tank T, which is closed when the servo valve 10 is in the central position C.

Hydraulic control arrangement

A hydraulic control arrangement is disclosed, for the load-independent control of a user with a continuously adjustable distribution valve (4) having a pressure compensator (2) down the line. According to the invention, the pressure compensator has a single-sided damping such that the movement in the opening direction is damped and the movement in the closing direction is essentially undamped. Furthermore, a control arrangement is disclosed in which a load holding function is integrated in the pressure compensator.

CONTROL CIRCUIT FOR A HYDRAULIC POWER LIFT OPERATED WITH A PUMP

HYDRAULIC CONTROL CIRCUIT FOR A MOTOR VEHICLE FOR PRIORLY SUPPLYING ONE OR MORE CONSUMERS

A control circuit includes a control system for a spring-prestressed priority valve (13) which supplies two consumers, one VI as a matter of priority. The consumer (VI) having priority is arranged to receive system pressure supplied by a pump (20) through a pressure regulator (1) and a further priority valve (12) for a secondary consumer VIII. The other consumer VII is supplied with a maximum pressure below this system pressure. For this purpose, the priority valve (13) is controlled on both sides by the pressure in the supply line (24) to the consumer (VI) having priority, a control valve (6) being inserted in the control line (26) on the spring side, said control valve (26) being prestressed into the blocking position and being controlled via a load-indicating line (27) by the other consumer VII. counter to the spring force, so that the pressure on the spring side of the priority valve is raised in order to bring the priority valve (13) into a throttling position for the supply line to the other consumer VII. <IMAGE>

CONTROL CIRCUIT FOR A HYDRAULIC LIFTER OPERATED BY A VARIABLE FLOW PUMP

Il présente une servo-vanne 10 à trois positions de connexion B, C, D et une unité de réglage 30, qui connecte et déconnecte la soupape d'obturation 20. La conduite d'information de la charge Xls est raccordée à la conduite de travail A et au réservoir, lorsque le dispositif de commande est en position de départ. La position centrale, respectivement d'obturation C suit d'abord à cette occasion la position de départ de connexion B de la servo-vanne 10, dans laquelle la conduite de travail A est reliée à la conduite de réservoir D, puis s'ensuivant une position de connexion D, dans laquelle la conduite de travail A est reliée à la conduite de pompe P. It has a servo valve 10 with three connection positions B, C, D and an adjustment unit 30, which connects and disconnects the shut-off valve 20. The load information line Xls is connected to the supply line. work A and to the tank, when the control device is in the starting position. The central position, respectively shutter C first follows on this occasion the starting position of connection B of the servo-valve 10, in which the working line A is connected to the tank line D, then following a connection position D, in which the working line A is connected to the pump line P.

PLUNGER FOR HYDRAULIC FLUID PRESSURE REDUCER

Spring support for a driver's cab

Patent FR2646688B1

SINGLE LEVER DIRECTIONAL CONTROL HYDRAULIC DEVICE FOR VEHICLE

Hydraulic control arrangement

A hydraulic control arrangement is disclosed for the load pressure independent control of a user, with a distribution valve, formed from an inlet metering orifice, a corresponding individual pressure compensator, a stop valve, provided for each user connection, which may be closed by means of a pilot valve, and an anti-cavitation valve, by means of which pressure medium can be drawn form a reservoir to avoid cavitation. According to the invention, the distribution valve and the stop valves are arranged along two parallel axes, whilst the axes of the both pilot valves are arranged perpendicular to these two axes. The anti-cavitation valves run perpendicular to the axes of the distribution valves, the pilot valves and the anti-cavitation valves.

Hydraulic control arrangement

The invention relates to a hydraulic control arrangement that is used particularly for controlling hydraulic consumers of a mobile machine tool. Said hydraulic control arrangement comprises a load signaling line to which the maximum load pressure of several hydraulic consumers that are simultaneously triggered via one respective main control valve can be applied, and a final section of which can be connected to a pump regulator. The hydraulic control arrangement further comprises a pressure relief valve which allows the control pressure to be limited in the final section of the load signaling line. In order to be able to easily and inexpensively control the pressure also for several hydraulic consumers, the pressure relief valve can be displaced in accordance with the level of a pilot signal that is used for triggering a main control valve.

Hydraulic arrangement

A hydraulic arrangement is described which, as a function of a pressure in an accumulator, automatically connects a pressure-medium source either preferably to the accumulator or to a consumer feed line, as is the case, for example, in an accumulator-loading valve. The arrangement has a pilot-control valve which has a housing as well as a pilot-control piston as valve body, the pilot-control piston, with main control edges, connecting an annular control space in the housing as a function of its position to one of two pressure spaces of different pressure level. Furthermore, the arrangement has a pressure balance which is connected to the annular space and is thereby actuated by the pilot-control valve, the pilot-control piston of which is in driving engagement with a piston section of larger diameter, which with the pilot-control piston together with the housing defines a differential pressure space. The control piston has two further auxiliary control edges, via which the differential pressure space, before the reversal of the annular control space to a lower pressure level, can be brought into connection with the pressure space of lower pressure level. With this hydraulic arrangement, the snap-over action of the pilot-control piston from one tilting position into another stable tilting position is intensified so that critical choking phenomena no longer appear.

Hydraulic control device

A hydraulic control device according to the invention is of load-sensing design and serves to actuate a first hydraulic load and a second hydraulic load. Also provided are a first control valve for actuating the first hydraulic load and a second control valve for actuating the second hydraulic load. A first load signal can be measured on the basis of a load pressure with which the first hydraulic load is acted on, and a second load signal can be measured on the basis of a load pressure with which the second hydraulic load is acted on. Pressure medium from a pressure medium source can be supplied in parallel to the first control valve and to the second control valve. A load signal path can, in order to actuate an adjusting element which is assigned to the pressure medium source, be acted on with a highest presently measured load signal. A limiting device allows the second load signal to be limited to a predefined signal limit value. A switching means can be actuated by means of the second load signal such that, at the latest when the second load signal reaches the signal limit value, the signal conveyed on the load signal path is limited by the limiting device.

Resvosterzo idrostatico per veicoli.

Regolazione di una pompa a portata variabile che lavora in funzione del carico

Circuito di comando per un sollevatore meccanico azionato idraulicamente con una pompa a portata variabile

Hydraulisches wegeventil

Hydraulische steueranordnung für ein mobiles arbeitsgerät

Hydraulische steueranordnung

Hydraulische steuervorrichtung

Hydraulische steueranordnung

Hydraulische steueranordnung

Hydraulische steueranordnung

Hydraulische steuervorrichtung

Eine hydraulische Steuervorrichtung ist in load-sensing Technik ausgeführt und dient der Ansteuerung eines ersten hydraulischen Verbrauchers und eines zweiten hydraulischen Verbrauchers. Des Weiteren sind ein erstes Steuerventil zur Ansteuerung des ersten hydraulischen Verbrauchers und ein zweites Steuerventil zur Ansteuerung des zweiten hydraulischen Verbrauchers vorhanden. Ein erstes Lastsignal ist auf der Grundlage eines Lastdrucks, mit dem der erste hydraulische Verbraucher beaufschlagt ist, und ein zweites Lastsignal ist auf der Grundlage eines Lastdrucks, mit dem der zweite hydraulische Verbraucher beaufschlagt ist, erfassbar. Dem ersten Steuerventil und dem zweiten Steuerventil ist Druckmittel von einer Druckmittelquelle parallel zuführbar. Ein Lastmeldepfad ist zur Ansteuerung eines der Druckmittelquelle zugeordneten Stellorgans mit einem höchsten gegenwärtig erfassten Lastsignal beaufschlagbar. Eine Begrenzungsvorrichtung erlaubt die Begrenzung des zweiten Lastsignals auf einen vorgegebenen Signalgrenzwert. Ein Schaltmittel ist durch das zweite Lastsignal so ansteuerbar, dass, spätestens wenn das zweite Lastsignal den Signalgrenzwert erreicht, das auf dem Lastmeldepfad geführte Signal durch die Begrenzungsvorrichtung begrenzt wird.

負荷圧減少を伴うハイドロリック式の制御ユニットおよび該制御ユニットに用いられるハイドロリック式の弁ブロック

【課題】効率が高められたハイドロリック式の制御ユニットと、この制御ユニットに用いられる弁ブロックとを提供する。 【解決手段】調節可能なハイドロポンプ２が設けられており、該ハイドロポンプ２の圧送通路４を介して、少なくとも１つのハイドロリック式の消費器６に圧力媒体が供給可能であり、さらに、ポンプレギュレータ３２が設けられており、該ポンプレギュレータ３２を介して、圧送圧と、１つまたはそれ以上のハイドロリック式の消費器６の最高負荷圧とに関連して、ハイドロポンプ２の調節装置３６の作動体積流量が調整可能であり、さらに、最高負荷圧に対する減圧装置５６が設けられているハイドロリック式の制御ユニットにおいて、減圧装置５６が、作動体積流量に関連して調節可能である。 【選択図】図１

Circuito di comando per un sollevatore meccanico azionato idraulicamente con una pompa a portata variabile

Dispositivo di comando indipendente dal carico per utenze idrauliche

Dispositivo per la regolazione di un organo di posizionamento partico larmente per la regolazione dell apparecchio di sollevamento di un trattore una mietitrebbiatrice o simile

Hydraulische steueranordnung

Die Erfindung betrifft eine hydraulisches Steueranordnung, die insbesondere für die Steuerung von hydraulischen Verbrauchern einer mobilen Arbeitsmaschine vorgesehen ist und die eine Lastmeldeleitung, die mit dem höchsten Lastdruck mehrerer gleichzeitig über jeweils ein Hauptsteuerventil angesteuerter hydraulischer Verbraucher beaufschlagbar ist und mit einem Endabschnitt an einen Pumpenregler anschließbar ist, und ein Druckbegrenzungsventil aufweist, mit dem der Steuerdruck im Endabschnitt der Lastmeldeleitung begrenzbar ist. Eine Drucksteuerung auch für mehrere hydraulische Verbraucher erhält man auf einfache und kostengünstige Weise dadurch, dass das Druckbegrenzungsventil in Abhängigkeit von der Höhe eines der Ansteuerung eines Hauptsteuerventils dienenden Vorsteuersignals verstellbar ist.

Hydraulische steueranordnung

Die Erfindung betrifft eine hydraulisches Steueranordnung, die insbesondere für die Steuerung von hydraulischen Verbrauchern einer mobilen Arbeitsmaschine vorgesehen ist und die eine Lastmeldeleitung, die mit dem höchsten Lastdruck mehrerer gleichzeitig über jeweils ein Hauptsteuerventil angesteuerter hydraulischer Verbraucher beaufschlagbar ist und mit einem Endabschnitt an einen Pumpenregler anschließbar ist, und ein Druckbegrenzungsventil aufweist, mit dem der Steuerdruck im Endabschnitt der Lastmeldeleitung begrenzbar ist. Eine Drucksteuerung auch für mehrere hydraulische Verbraucher erhält man auf einfache und kostengünstige Weise dadurch, dass das Druckbegrenzungsventil in Abhängigkeit von der Höhe eines der Ansteuerung eines Hauptsteuerventils dienenden Vorsteuersignals verstellbar ist.

Circuito di comando a pompa per un sollevatore idraulico azionato con una pompa a portata variabile

Steuereinrichtung für ein arbeitsgerät mit einer ausleger gehaltenen schaufel

Hydraulische steueranordnung

Procedimento e dispositivo per misurare la forza dei bracci oscillanti inferiori di un apparecchio di sollevamento per trattore.

Hydraulische steueranordnung

Hydraulische steueranordnung

Offenbart ist eine hydraulische Steueranordnung zur Druckmittelversorgung zweier Verbrauchergruppen über eine gemeinsame Verstellpumpe. Erfindungsgemäß ist das Druckniveau eines einer Verbrauchergruppe zugeordneten Steuerblocks auf ein anderes Druckniveau eingestellt als dasjenige eines weiteren der anderen Verbrauchergruppe zugeordneten Steuerblocks.

Hydraulische steueranordnung

Offenbart ist eine hydraulische Steueranordnung zur Druckmittel Versorgung zumindest eines Verbrauchers, wobei im Vorlauf und/oder im Rücklauf des Verbrauchers ein stetig verstellbares Wegeventil mit zwei Schaltstellungen und ein Senkbremsventil angeordnet sind, wobei letzteres vom Druck im Zulauf in eine Öffnungsstellung bringbar ist. Das Wegeventil ist mit einer offenen Neutralstellung ausgeführt und kann elektrisch oder elektrohydraulisch aus dieser Neutralposition in Richtung seiner zweiten Schaltstellung verschoben werden.

Procede et dispositif de mesure de la force transmise par les barres d'attelage inferieures d'un systeme de relevage d'un tracteur

SELON LE PROCEDE, UN CAPTEUR DE DEPLACEMENT DETECTE UNE DEFORMATION, DETERMINEE PAR LA FORCE TRANSMISE PAR LES BARRES INFERIEURES, D'UN ELEMENT FIXE DE FACON DEFINIE SUR LE CHASSIS, CARACTERISE EN CE QU'ON MESURE LE DEPLACEMENT ELASTIQUE DES ELEMENTS DU TRACTEUR QUI SONT DISPOSES DE MANIERE A FORMER UNE CHAINE OU PARCOURS RIGIDE 100 A 106 DE PASSAGE DE LA FORCE ENTRE LES BARRES INFERIEURES U ET LE SOL. LE DISPOSITIF COMPREND UN CAPTEUR DE DEPLACEMENT 104 RELIE DE FACON RIGIDE EN UN POINT DU CHASSIS 1, DONT LA DISTANCE A PAR RAPPORT AU POINT D'ARTICULATION 101 DES BARRES INFERIEURES EST IMMUABLE ET QUI SUPPORTE UN CAPTEUR DE DEPLACEMENT 30 QUI RESTE EN CONTACT DE MESURE AVEC UN ELEMENT DU TRACTEUR QUI EST DISPOSE DANS LA CHAINE RIGIDE CONSTITUEE ENTRE LES BARRES INFERIEURES U ET LE SOL ET PAR OU PASSE LA FORCE.

Procedimento e dispositivo per misurare la forza dei bracci oscillanti inferiori di un apparecchio di sollevamento per trattore

Hydraulische ventilanordnung

Hydraulische steueranordnung für ein mobiles arbeitsgerät

Distributeur hydraulique a tiroir en plusieurs parties

Distributeur hydraulique (1) comportant un corps (2) muni d'un alésage (3) débouchant sur au moins une face (4, 5) dudit corps (2) et abritant un tiroir de distribution (6) à coulissement axial dont au moins une extrémité fait saillie hors du corps, caractérisé en ce que le tiroir (6) est constitué en au moins deux parties, à savoir une partie centrale (7) qui reste abritée dans l'alésage (3) quelle que soit la position axiale occupée par le tiroir dans l'alésage et au moins un embout (8, 9), solidarisé à la susdite partie centrale (7), qui correspond approximativement au moins à la portion du tiroir saillant hors de l'alésage du corps lorsque le tiroir est déplacé axialement dans sa position extrême en direction de ladite face.

Schlauchbeutelmaschine mit zumindest zwei quersiegelbacken

Vorsteuergerät

Offenbart ist ein Vorsteuergerät, über das zumindest zwei mechanisch betätigbare Steuerventile (8, 10) und zwei elektrisch oder elektrohydraulisch betätigbare Steuerventile (20, 22) ansteuerbar sind. Das Vorsteuergerät hat einen Schwenkhebel mit zwei Handgriffen (2, 4), an denen jeweils ein Schaltelement (12) zur Ansteuerung der elektrisch/elektrohydraulisch betätigbaren Steuerventile vorgesehen ist.

Vorsteuergerät

Offenbart ist ein Vorsteuergerät, über das zumindest zwei mechanisch betätigbare Steuerventile (8, 10) und zwei elektrisch oder elektrohydraulisch betätigbare Steuerventile (20, 22) ansteuerbar sind. Das Vorsteuergerät hat einen Schwenkhebel mit zwei Handgriffen (2, 4), an denen jeweils ein Schaltelement (12) zur Ansteuerung der elektrisch/elektrohydraulisch betätigbaren Steuerventile vorgesehen ist.