DEVICE FOR CONSTANTS SUPPLYING AN EXPENDABLE APPARATUS, E.G.A SPRAY GUN, WITH AT LEAST ONE LIQUID

The invention concerns a device for constant supplying of an expendable apparatus, e.g. a spray gun, with at least one liquid of variable viscosity, e.g. a color, which device a supplying source as well as a feeder line from the latter covers the liquid of variable viscosity to the expendable apparatus. A Sprltzplstole is supplied generally by a color supply mechanism, which works with pressure, with color. The color withdraws from the spray gun by a nozzle, which can be blocked by a nozzle needle. The latter makes possible to close or release the color delivery. On the other hand partial opening makes possible for the needle to throttle the passage by the nozzle. I0 this classical system is simple, but it does not make it possible to obtain a continuous color delivery. In order to receive the regularity, one would have to regulate primarily the Zuführungsdruek of the color precisely, what could possibly happen by means of a pressure-reducing valve. That would however not be sufficient, since the withdrawal of the color depends by the nozzle bore also on the viscosity of the color. This varies however with the quality the same, with the dilution and particularly with the temperature. It is to be understood easily that it is difficult to control the temperature absolutely. Depending upon quality and dilution of the color one could in-regulate the pressure and the nozzle bore to the desired value of the withdrawal quantity, but for numerous reasons one often changes the color within a daily to e.g. change in order the colour. on the nozzle bore would have to thus in-regulate again with each change the pressure or. On the other hand it is difficult to measure a color withdrawal quantity because the simple measuring systems indicate results of measurement, which vary with the viscosity. Finally the colors work sanding off, and the wear of the nozzle bore or the nozzle needle point brings changes in the flow rate with itself, to substantial is it thus, the supply of the pistol not under constant pressure to maintain but with constant delivery volume. It is certain that then the pressure as a function of the aforementioned ratios varies, but constantness of the pressure of the color delivery is not necessary for good functioning of the spray gun. Therefore the invention set itself to the goal, a device for constant supplying of an expendable apparatus, e.g. for a spray gun of developing with at least one liquid of variable viscosity, e.g. a color an adjustable and constant withdrawal quantity of a liquid of variable viscosity to adjust permitted, always the viscosity whatever value may have. The task posed is solved according to invention by two positiv displacement pumps, which are mechanically in such a manner coupled with one another that its deliveries stand to each other in a firm relationship, whereby first of these pumps is switched on into the feeder line for the liquid of variable viscosity, against what second is switched on into a cycle, in which a liquid of constant viscosity rotates and which ent in direction of rotation behind the second pump of regulation organs for the delivery volume of the liquid of constant viscosity 0 holds. The liquid of variable viscosity can e.g. be color, the second liquid, which is from constant viscosity, can e.g. water be. If the delivery volume of the water is well regular, also the color quantity will be just as well regular, since the deliveries of the two coupled positiv displacement pumps will always remain in a being certain relationship. Or differently & 5 expressed, the regulation of the output quantity is made by an auxiliary liquid, whose characteristic is stable and independent of the characteristic of the color. In the course of the available wording it is to be accepted that the auxiliary liquid is water. The pressure of the auxiliary liquid with constant viscosity, which e.g. water can be, will not remain the same, if the two pumps are in activity. In order from there it the delivery of the water and to hold so that also those the color to a constant, in-regular value, according to invention planned that the regulation organs consist in the cycle of an adjustable pressure-reducing valve attached to the print page of the second pump and a latter a first calibrated nozzle downstream of adjustable diameter. The delivery of the water and Nr.371740 therefore also those the color are determined by the values of the calibrated nozzle. In addition the delivery volume can take place via regulation of the pressure which can be stopped at the pressure-reducing valve with given diameter the same. Now different execution forms of the invention with reference to the designs are to be described. In the designs shows: Fig.1 a block diagram of a first execution of a device for continuous feeding of a FarbsprJtzpistole with only one color, Fig.2 a similar device, however for two different colors, Fig.3 a second execution form of the invention, Fig.4 (divides II by the dividing line into two designs, 4a and 4b) a Vorrichung for continuous feeding of a paint spray gun with a continuous, however adjustable mixture of three Spritzftfissigkeiten, with gteichbleibender sum of the three portions. In Fig.1 hinund a working drive operates --1--, e.g. a pneumatics, synchronously the pistons of two coupled with one another positiv displacement pumps --2 and 3--. In the designs is pneumatics --1-- and the pumps --2, 3-- for simplification as Differentiatpumpen represented, it is to be noticed however that they can be implemented also as double acting, differentially not working pumps. A memory --4-- for zersprfihbare color supplies by a line --5-- the coloring material to the pump --2--. The pre-determined outlet pressure can correspond to the atmospheric pressure or be appropriate more highly. Ven of the pump --2-- the FarbstofffIuß is fed. This begins at the exit of the Purepe --2--, a steered valve goes through --6--, around to a feeder line --7-- to lead, those into the color entrance of the spray gun--8--flows. Since in the conventional color spraying mechanisms generally with compressed air one works, is the valve --6-- preferably compressed air-steered. The pump --3-- feeds a water circulation. To this a line belongs --9--, a pressure reducing valve --10--, a regulating valve --11-- with preferably pneumatic control, a flow meter --12--, and a preferably pneumatically steered regulating valve --14-- with inserted calibrated nozzle --13--, their diameter is adjustable. Two compressed air circles are intended. The first circle --15--, supplies via a stop valve --16-- and a pressure-reducing valve --17-- the pneumatic drive --1--. The second circle steers on the one hand by an air supply line --18-- the Spritzpistele --8--, and on the other hand by lines --19, 20, 21, 22-- the regulating valves --6, 11 and 14--. As from Fig.l to be recognized, these three valves are preferably in such a way built that they open on actuating pressure and close with abolishment of the actuating pressure by effect of a spring action. However it could be also on actuating pressure closing valves. To this case a suitable distributor would have to be introduced, that the valves into the actuating pressure air circle --6, 11 and 14-- druckles makes, if the pistol --8-- Compressed air receives, and turned around the valves under pressure sets, if no more compressed air is supplied to the pistol. Downstream the nozzle --13-- the rotating circle of the water is by a memory --23-- supplemented, that over a line --24-- to the original side of the pump --3-- it leads back with which the circle is closed. The descriptive device for the continuous supply of spraying color works as follows: If after opening the stop valve --16-- the pneumatic drive --i-- Compressed air receives, practices this drive a Kraft on the piston rods of the pumps --2 and 3-- out. These Kraft will be alike to the sum of the forces opposite of the two pistons, whereby everyone is these forces equal the product of the effective piston surface times the pressure of the fluid (water and/or color). If the valves --6 and 11-- are closed, is indefinite the height of the pressure of the water and the color. But if one the valves --6, 11 and 14-- and at the same time even if the valve needle of the pistol opens, latter color will deliver, and the nozzle --13-- water will deliver. The water pressure takes a defined value, if the pressure of the water promoted by the pump is larger than the regulation printing of the pressure-reducing valve --10--. Likewise results an a regulation for the spraying color, whose pressure adjusts itself to the value, which is necessary for the withdrawal of the spraying nozzle. After this a regulation also the water pressure takes such a value that the sum of the counter acting forces of the two pumps --2 and 3-- is alike by the drive --'I-- expenditure-practiced Kraft. The latter can be affected by regulation of the pressure of supplied compressed air, to which the pressure-reducing valve --17-- is intended. Pneumatiseh the steered valves --6, Ii and 14-- it is intended to the fact that the printing values maintain the values reached in the enterprise with stop. Depending upon the size of the pressure of the container --4-- supplied Farbflüss [gkeit it can be necessary in such a manner to plan a regulation that the pressure of the color liquid when promotion by the pump --2-- is more gröfler than the outlet pressure from the container --4--, if perfect functioning of the flap in the pump --2-- to be ensured is. Such a regulation can e.g. by one in the Venti! --6-- inserted nozzle with adjustable width, similarly the nozzle --13--, to be realised. The device represented in Fig.l sees the use of an automatic spray gun --8-- forwards, since performing are provided with automatic equipment mostly with constant supply. Nontheless one can do working, the controlling of the valves with a pneumatic hand atomizer pistol or a delete pistol, i.e. one at the same time pneumatically and hydrostatically --6, ii and 14-- with valves well-known design cause, release which actuating pressure air, if the pistol with atomization compressed air works. The flow meter --12-- permitted to steer the Wasserzufluß and thus also the Farbstoffahgahe. An easy accurate attitude permits, while so far the attitude was possible after feeling only. For regulating one knows either the flow diameter of the kalihrierten nozzle --13-- change or by means of the pressure reducing valve --i0-- the pressure change. In Fig.2 a device is represented, by means of which a spray gun --8-- with two different color liquids to be supplied can. The reference numbers are invariably taken over regarding those parts, which agree with those the Fig.l, whereby however an additive A marks those parts, which serve particularly the supply and regulation of the Ith color liquid, and additive b the parts, which are necessary for the 2nd Farbflüssigkeit°. To their Druekseite are the two pumps, --2a and 2b--, over ever a feeder line --7a and/or 7b-- with a three-way valve --25-- connected, its exit by a line --7-- to Parkeingang of the pistol --8-- leads, whereby depending upon position of the valve the color from pump --2a-- or from pump --2b-- to be selected can. In truth is this three-way valve --25-- a simplified representation actually well-known distributor, those automatically the color choice make and with each Farhwechsel a flushing of the feeder line --7-- to the pistol as well as the pistol would drive through. In the block representation of the Fig.2 two compressed air control circuits are intended. The first circle, --18/19--, the impact of the pistol regulates --8-- and opening the pneumatically steered valve --14-- the water circulation. The second compressed air control circuit causes by means of a distributor--26--, that mechanically with the three-way valve --25-- , either opening of the pneumatically steered valves is coupled --6a and lla--, or opening the appropriate valves --6h and llh--, depending upon by the valve --25-- met Farhwahl. The print pages of the two pumps --Sports club and 3b-- work parallel on “a common Wasserrücklauf into the container --23--, whereby into the line a flow meter --12-- and a pneumatically steered valve --14-- with adjustable nozzle --13-- are inserted. Of the container --23-- a first common line leads --24--, itself into the two branches --24a and 24b-- giving ELT, for the sucking in side of the two pumps --3a and 3b--. In of the pumps --Ha, 8h-- outgoing line sections --ga, 9b-- are pressure-reducing valves --10a, 10b-- and pneumatiseh steered valves --lla, llb-- planned. It is to be preferred, for each of the two pumps --3a, self-service-- an own pressure-reducing valve --16a, 10b-- to plan, because it is not certain that the delivery quantity of the two colors must be alike or that their flow characteristics to agree. One must be able to adjust from there the Wasserdruek in the two cycles separately, in order to regulate thereby the quantities of water and by means of the same the coloring material quantities. If the Regelb8reieh attainable with the Druekminderern should not ausreiohen, additionally () Hilfsdüson not shown knows used, e.g. into those pneumtisch rule baron Ventile --3 A, llb-- the pumps --SA, self-service-- to insert are. Two calibrated nozzles in series, of those are then present one a certain pump in each of the two water circulations --SA or self-service-- , the other one is assigned, --13--, which is common to both cycles. As previously mentioned, further nozzles can be planned, those in the pneumatically adjustable valves --6a, 6b-- the Farbonleitungon --Ta, 7b-- to insert is, in order to obtain a Farbonliefordruck if necessary, that is higher than the Lieferdruok from the containers --4a, 4b--. In the performing after Fig.1 and 2 run by a altornierenden drive --l-- moved pumps --2 and 3 and/or 2a and 3a (2b and self-service)-- synchronously. Such drives e.g. are. i0 vorwondbar, if the source of coloring material --4 (4a, 4b)-- the coloring material with relatively low pressure delivers, which is too small for the enterprise of the pistol. However supplied with certain usual Farbspritzanlagon the color from the coloring material pours generally with a pressure, which is higher, than it requires the enterprise of the pistol. One plans then a Enorgioquolle, which is sufficient, around the two pumps --2 and 3-- to operate the erfindungsgomäßen color promotion device, and the alternating drive --i-- can be void. Actually can if the Farbquollo --4-- the color under high pressure supplies, the Farbpumo --2-- as engine and the Wasserpumpo works --S-- mltziohen. Such an arrangement is represented in Pig.3. During this execution are the pumps --2 and S-- doppoltwirkond. Each of these pumps points a cylinder --27-- up, that of two cylinder caps --29, 30-- and in that itself a piston is locked --28-- moved. The two pistons --28-- are by a common piston rod --31-- connected, by its whole length the same Quorschnitt and those exhibits those the four cylinder caps --29, $0-- penetrates, whereby seals or Stopfbüchson ensure the Diehthoit. Each Zylindordockel --29, 30-- range points one sucks ffnung with a valve in its untoron --$3 and/or 35-- and within its upper range a Druoköffnung with a valve --$2 and/or. $4-- up. These four valves steered by compressed air. As shown in addition, in Fig.S, the valves on pressure open, them could be so built that them on pressure schlieiBon. The controlling of the four valves is in such a way eingorißhtet that the exit port at the cylinder end and the outlet at the other end are open, if the firstmentioned Austrittsklappo and D e Hinso footstep-fold at the other end are closed and turned around. More exactly said, belongs to the four Vontilen --32, SS, 34, 35-- a compressed air Umschaltevontil--$6--. Its Eingangsöffnung is attached to a Steuordruckluftquello. Between two exit ports can be selected by presenting a slidegate valve. An exit port of the valve --36-- is by lines --S7, 38, 39, 40-- to the two valves --33 and $4-- ange $5 closed, the other exit port by lines --41, 42, 43, 44-- to the valves --$2 and 35--. The position DOS of slidegate valve in the valve --36-- one steers pneumatically. Hiefür are two air intakes --45, 46-- planned, which by switching valves --47, 48--, those for their part by a Necke --49-- on the Kolbenstango --31-- are operated, either to a source of compressed air or to the Außonluft to be put on. The Parbquolle --4-- is by a line --5-- to the Saugöffnungon of the pump --2-- with the Ventilon --33, 35-- attached. Of the Drucköffnungon of the pump with the valves --32, 34-- a feeder line leads --7-- to the entrance of the spray gun --8--. The Auslässo of the valves --$2, 34-- at the water pump --3-- are with the Druckmindercr --10-- connected, the Einlässo of the valves --33, 35-- at the same Wassorpumpo --S-- stand by a line --24-- with the container --23-- in connection. The Wirkungswoise of the descriptive device is the following: In the position shown in Fig.S the Umschaltoventil lets --36-- Compressed air the two valves --33-- and the two valves --34-- come. These open from there. Sohin steps the color which is at pressure into the cylinder --27-- the Farbpumpo --2-- at the side right of the piston. The pump works as engine. The piston rod --31-- , the pump is shifted to the left --3-- Förderarboitet carries out. In the cylinder --27-- æarbpumpo --2-- left of the piston color present steps by the valve --34-- out and becomes the pistol --8-- supplied. Likewise becomes in pump --3-- on the left of water present by valve --34-- in the direction of the pressure-reducing valve --I0-- pressed, from there to the run measurer --12--, to the valve --14-- and by the nozzle --12--. Water becomes at the same time from the container --23-- by the line --24-- and the valve --33-- into the cylinder --27-- sucked in. As soon as the two pistons --28-- the stroke way in the direction of left (in the designs) completed, puts the driver --4a-- the transfer valve --47-- on source of compressed air over, whereby the entrance --45-- the switching valve --36-- and the slidegate valve in the latter its position keeps an impulse changed. Now compressed air subjects the two valves --32--and the two valves --35--, so that these open. At the same time the valves close--33 I0 and 34--, since they are not to no more at actuating pressure, with spring action. Consequently now color from the container steps --4-- by the valve --35-- into the left side of the cylinder --27-- the pump --2-- , which works as engine. The common piston rod --31-- with the two pistons --28-- moves to the right. The color, those before the cylinder of the pump --2-- from right had filled, becomes now by the valve --32-- and the line --7-- into the pistol --8-- pressed. Likewise becomes from the right cylinder side of the pump --3-- the water by the valve --32-- through into the pressure-reducing valve --10-- pressed. If the two pistons terminated their stroke way to the right, the driver puts --49-- the transfer valve --48-- over. The valve --36-- contains a printing impulse at his entrance --46--, and the Sehieberstellung is again changed. The valves --33 and 34-- open again, the valves --32 and 35-- close. The descriptive procedure begins again. The regulation of the water circulation takes place in the same way as with the remarks after Fig.l and 2, with the pressure-reducing valve --10-- and the adjustable nozzle --13--. If the two pumps --2 and 3-- or volumes, which are in certain relationship to each other, the deliveries, have the same volume of the water and stand for the color equally large or it in a certain relationship to each other. Therefore is, if the water delivery is correctly regular, the color supply from the print page of the pump --2-- likewise regularly, u.zw to the same value as the water supply or in certain relation to the latter. If the pump --2-- as engine, as represented in Fig.3, the pumps double acting Kelbenpumpen work and give Differentialpumpen, because not the latters, working as engine, must be no regular output. Furthermore is to be considered: If the color source --4-- to Fig.3 under relatively low pressure supplies, can the double acting pumps --2 and 3-- both of them as pumps work, if their common piston rod is attached mechanically to one hinund working drive, e.g. to a pneumatic motor as in Fig.l. If on the other hand the two color sources --4a and 4b-- from Fig.2 under sufficiently high pressure supply, can of the engine --la-- and the Differentialpumpen --2a and 3a-- formed unit by a unit to be replaced, those from two double acting pumps --2 and 3-- the Fig.3 is formed. Dassebe is valid for the unit --lb/2b/3b-- the Fig.2. With described the execution forms the above one knows a color spray gun with only one coloring material (Fig.1 and 3) and with two different colors (Fig.2) to operate alternatively. Now there are coloring materials, which consist of two components, which let the desired color order react with one another and result only from Copolymerisation. This mutual reaction of the two components not possibly makes their previous mixing or makes it more difficult. The problem consists thus of creating a supply installation which secures a continuous mixing in continuous relationship in accordance with condition of the requirements and with continuous total yield. In addition the mixing proportion must be adjustable according to the type of the color and the regulations of the producer. Also the total yield must be adjustable, in order to guarantee a correct supply and a good functioning of the pistol. Sometimes it is also necessary to dilute the color with a dilution or a solvent. The dilution degree must be adjustable constant, however in the enterprise depending upon paint type and operating instruction. Sehließlioh is wfinschenswert it to be able to use the solvent for flushing at least one part of the lines flowed through by the color. The invention makes possible to solve also this problem. In the following described with reference to Fig.4a and 4b one for this purpose developed device. Appropriate parts receive appropriate reference symbols also here. The group --A-- covers one hinund working drive --la--, e.g. a compressed air engine, that the pistons of two intercoupled positiv displacement pumps --2a and 3a--, e.g. Differentialpumpen, synchronously propels. Preferably is the drive --la--, the pump --2a-- and the pump --3a-- coaxially arranged, whereby these three elements by linkages --50-- are held together. The piston rod of the piston --51a-- the drive --la-- is direct with the piston rod --52a-- the pump --3a-- and by means of linkages --53a-- also with the piston rod --54a-- the pump --2a-- connected. I0 such an coaxial arrangement is particularly favourable, because all demands toward the axle of this construction unit --A-- work and these from there in the equilibrium largely also always are, as the loads of the pumps --2a or 3a-- to be like. The pump --2a-- sucks through a line --5a-- from a container --4a-- a first distributed inventory part on, e.g. a color additive, to the color, those the spray gun --8-- to supply is, and the pump presses this additive over a Verbindungslcitung --7a-- into a controllable valve --6a--. The pump --SA-- a liquid of continuous viscosity, e.g., sucks water from a container --23-- by an inlet --24--, those the three construction units --A, B and C-- is common. It presses the water into a cycle --9a--, that in common collecting line --9-- to the container leads back. In the cycle --9a-- are intended, in order of the flow: pressure-reducing valve druckluftgesteuertet --19a--, a controllable valve --1la--, an adjustable nozzle--13a--, a flow meter --12a--. Thus the water pressure with the entering the pressure-reducing valve --10a-- not too much, preferably is this a primary pressure-reducing valve varies --55a-- upstream, around an actually constant pressure at the withdrawal from the pressure-reducing valve --10a-- to obtain. The latter permits it to keep the water pressure continuous to a value which depends on the size of the control air printing, which affects the pressure-reducing valve. With this state of affairs is the water flow through the nozzle --13a-- constantly; it can be regulated by adjusting the nozzle diameter. There now the two pumps --2a and 3a-- and thus their deliveries are coupled continuously proportionally with restraint, whereby the porportionality factor of the stroke areas is certain, remain themselves also the delivery of the pump --2a-- constantly and proportionally what latter can be changed both at the pressure-reducing valve with the Wasserförderung, --10a-- and at the adjustable nozzle --13a-- to be regulated can. The two other construction units, --B and C--, and their accessories similarly developed and from there in detail are not described, similar ones of parts are characteristic, however with same reference numbers by the additives --b or C-- instead of --A-- differentiated. It is to be only said that the pump --2b-- to promote, e.g. a hardener, and the pump know a second color additive --2C-- a further additive, e.g. a dilution. In all other respects can in the cycle --9c-- at least one part of the controlling means to be short circuit; then one receives when desired a higher Wasserförderung and therefore also a larger promotion at solvents, if one wants to e.g. flush a part of the farbdurchflossenen cycle. For this purpose is parallel to the valve --11c--, the nozzle --18c-- and the flow meter --12c-- a detour line --56-- planned, in which a controllable valve --57-- lies. The three Druokminderer --10a, 10b, 10c-- are by a line --58--, those by a compressed air-steered pressure-reducing valve --60-- passes through, to a common source of actuating pressure air --59-- attached. The valves --6a, 6b, 6c, lla, llb, 11c and 57-- are preferably controllable by compressed air. E.g. are the valves --6a, 6b, 6c and 57-- in the basic position closed, the valves --11a, llb, 11c-- opened. The drives --la, Ib, IC-- as well as the above-mentioned valves can be provided with compressed air by control equipment, which is further below described. The original sides of the valves --6a, 6b, 6c-- lead to the collecting inlet --61-- a mixer --62--, which works depending upon need resting or moved. The exit of the mixer is by the feeder line --7-- with the entrance of the spray gun --8-- connected. This becomes from source of compressed air --59-- over a line --63--, those by a distributor --64-- and a Druekminderer --65-- goes, supplied with compressed air. The distributor --64-- is intended, around the line --66-- to pressurize, if the pistol works and the pressure from it escape to let, if the pistol does not work; if the line --66-- at pressure is, sets it over a timer --68-- a distributor --67-- in activity. This permits a direct, direct effect, if the line --66-- at pressure is, i.e. if the pistol begins to work. If however the pistol stops working, the decrease of pressure in the controlling of the distributor retards --67--. , Stopping the Druckluftantriebe permits --la, lb, IC-- to retard and to retard concomitantly the Drueklosmachen of the cycle line, if the pistol --8-- a short instant between two spraying procedures one stops. In a state of rest, if the pistol out of operation and the line --66-- without pressure is, is the distributor --67-- in the position shown in Fig.4b. Then is the line --69-- with the Druckluftquele --70-- connected and the valves open in basic position --la, 11b, 1ic-- are at air pressure, are thus closed. However are the lines --71, 72, 73-- connected with free air, so that the drives --la, lb, IC-- stand quietly and the valve --6c-- in his closed basic position remains. A distributor --74--, which can take two positions, a connection between the lines places in a position (is shown in Fig.4b) --75 and 72-- and at the same time Drueklosmachung of the line --76-- ago. In its second position it connects the line --72-- with the line --76--, during pressure-free making of the line --75--. Thus are with the first position of the distributor --74-- and under the descriptive initial conditions the valves closed in basic position --6a, 6b, 57-- smooth Steuerdruek and thus closed. If one presses compressed air on the cock of the pistol and omits these sohin, the distributor sets --64-- the line --66-- under pressure. In the consequence see moved the distributor --67--, now the lines --71, 72, 73, 75-- with source of compressed air --70-- , however the line connects --69-- to blow off lets. Consequently the valves open --11a, llb, 11c-- and come in connection with outside air. The drives receive at the same time --la, lb, le-- Compressed air and start. The valves --6a, 6b, 6c-- open. The delivery volumes of the three components, those of the pumps --2a, 2b, 2C-- into the feeder lines --7a, 7b, 7c-- it is promoted, can be in-regulated independently by the fact that one the water circulation quantities in the cycles --9a, 9b, 9e-- regulates and/or the nozzles --13a, 13b, 13c-- adjusted. It st also possible, the mixing proportion between color and the hardener, those the mixer --62-- are supplied to adjust according to regulation of the producer. In addition it is also possible, the dilution and thus the V [that skosität the spray gun supplied mixture to regulate, by one by adjusting the nozzle --13c-- the quantity the mixer of coming diluent regulates. Finally it is also possible, the total quantity for that the pistol supplied mixture under complete maintenance by attitude of the nozzles --13a, 13b, 13c-- to regulate fixed mixing proportion of the three components, by one the water pressure in the three cycles --9a, 9b, 9e-- at the same time by means of dreß the pressure-reducing valves --10a, 10b, 10e-- changed, which one reaches by that one the upstream common pressure-reducing valve --66-- and thus the actuating pressure at the three pressure-reducing valves varies. With stopping time one must the lines, by which the mixture flowed, cleans and flushes. The execution of this operation permit the distributor --74-- and the controllable valve --57--. In Fig.4b is the distributor --74-- in working position drawn. In this situation is the valve closed in basic position --67-- (Fig.4a) placed on printing discharge opening, thus closed, while the controllable valves --6a, 6b--, (Fig.4b) with the line --72-- in connection are located, so that it of the distributor --67-- for the normal function of the pistol --8-- (i.e. for the color supply described above) to be steered. For flushing one puts the hand lever of the distributor --74-- into the position dash-dotted in the designs over. Then the normally closed valves become --6a, 6b-- posed on printing discharge opening, i.e. closed, while the line --76-- with the line --72-- into connection and the normally closed valve comes --57-- over the distributor --67-- and the two lines --72, 76-- Control printing receives, as soon as one presses on the departure of the pistol. In this case the pneumatic drives receive --la, lb, IC-- Pressure, but only the pump --2C-- solvent, because only the valve can promote --6c-- opens, the two valves --6a and 6b-- but remain closed. Furthermore valve opens --57--, and the nozzle --13c-- as well as the flow meter --12c-- are by the line --56-- gone around, thus stopped. This permits a large water delivery and from there a large delivery from L6semlttel to the Durchspfilen of the Sammeleinlassers --61--, the mixer --62--, the feeder line --7-- and the spray gun --8--. In so far the saying had assumed the three controllable valves --1la, 11b, 11c-- by such with open basic position are formed. In addition, it is possible to replace it by such with closed basic position. Then they must to the line --71-- I0 to be attached, and the line --69-- would be void. In Fig, 4a, 4b example shown are three Bauelnheiten --A, B, C-- to the supply of color etc. intended. Possible it would however be to plan one or more further construction units for further mixture components e.g. for still different Farbtönungen. Also one could supply two or more 8pritzpistelen from the plant. Then one would have for each of the three construction units --A, B, C-- just as many controlling means for the water circulation plan, i.e. valves --11-- and nozzles --13--, as pistols are present. Furthermore a distributor must similar to the distributor at each line, which supplies a pistol with compressed air, --64--, to be planned, that the function of compressed air distributors similarly the distributor --67-- steers. Furthermore production of the equilibrium between the VersorgungsIeitungen of the different pistols is necessary, in order to divide the delivery evenly with this system. In so far the saying it is accepted that the pumps --2a, 2b, 2C-- the two color components and the dilution from the three containers --4a, 4b, 4c-- suck in. If however the three liquids are delivered under pressure, the pumps can work as engine and at it the three water pumps --aa, off, 3c-- along-pull, so that the drives --la, lb, le-- been void can. In this case one uses pumps with controllable valves, similarly as shown in Fig.3. Managing the invention is descriptive in an application to the paint spraying, it understands itself however that it is applicable everywhere, where a Vlrbrauchsglrät must be supplied with one or more liquids a variable viscosity with constant supply quantity. The descriptive execution forms are to be only understood as examples, whereby variants are possible in the context of the invention.