VALVE ARRANGEMENT FOR SIMULTANEOUS OPENING AND CLOSING OF TWO OF SEPARATE INLETS OFF FOR LIQUID OR GASEOUS MEDIA.

The invention concerns a valve arrangement to open and closing two separate inlets off for liquid or gaseous media with different characteristics, in particular different pressure, with the characteristics from the generic term of the patent claim 1.

In particular in the sanitary area frequently the problem arises, daß two inlets, for example for cold and warm water, in a Mischeinrichtung to be united, whereby the two inlets are to be opened or closed together. The engagement of a common valve after the unification of the two inlets is not possible if the two inlets stand under very different water pressure. Thus it occurs for example, daß the water heating in a pressure-free memory is made and the warm water at the tap with chilled water with a pressure by for example 3 bar to be mixed muß. In such cases is a common closing at the Auslaß the tap not possible, because the chilled water was back-pressed into the warm water line.

In such cases muß ten so far in the two inlets separated arranged valves to be used, which brought a increased technical expenditure with itself.

There is well-known self-medium-operated valves steered by armatures, which in each case exhibit the characteristics from the generic term of the patent claim 1 for itself (e.g. see to DE-A-36 42,669).

The invention is the basis the task to train a valve arrangement in the generic term of the patent claim 1 indicated kind so daß at as small an expenditure as possible common opening and Schließ EN of the two inlets is possible, even if the media flowing in them possess a substantial difference of pressure. The valve arrangement is to be close in inverse direction against as high a negative pressure as possible, but open still with low media pressures fully.

The solution of this task takes place erfindungsgemäß with the characteristics from the characteristic part of the patent claim 1st favourable further educations of the invention are descriptive in the Unteransprüchen.

The basic idea of the invention consists of planning into both inlets separated valves which are headed for however by a common pilot valve. As describes further down on the basis a remark example more near, this common pilot valve possesses two armatures, at which the armature seals, but only one solenoid coil are arranged, by which these two armatures are operated. On the one hand a good hydraulic separation of the two media is in this way guaranteed with geschloss nen valves, on the other hand one a simultaneous manipulation is possible over the common magnetic system with small expenditure.

Those erfindungsgemäß e valve arrangement is primarily meant for application of inlets, which lead both liquid media, for example water. It is in addition, with advantage applicably at inlets, of those a liquid and the other one a gaseous medium leads or also at inlets, which lead both gaseous media.

A particularly good counter-pressure tightness that erfindungsgemäß EN valve arrangement is reached, by gemäß the characteristics from the patent claims 5 and 6 the necessary Schließ strength against negative pressure is distributed on two coaxially arranged compression springs, of which one affects directly on the differential piston and the other one the anchor of the magnetic system. The feathers/springs can be dimensioned then so favorably, daß the smaller part of the Schließ strength is applied by compression spring the affecting the differential piston, during the remainder by the return spring is applied and thus directly by the magnet. This has as a consequence, daß in the opened condition of the valves the low pressure fitness is not reduced.

In the following on the basis the attached design a remark example of a valve arrangement is more near described after the invention.

In the design a valve arrangement is represented on average, which can be arranged in the sanitary area, for example at a mixing tap for cold and warm water.

Through not represented separate inlets flows cold and/or warm water with different pressure to a Zuleitungsanschluß Z1 and a Zuleitungsanschluß Z2 and by those far valve arrangement to a Ableitungsanschlu&szlig, descriptive down; A1 as well as a Ableitungsanschluß A2, to itself the not represented Mischeinrichtung anschließ EN can.

The connections Z1 and A1 and/or Z2 and a2 are arranged, so da&szlig in the represented remark example in relatively small distance from each other; between them the valve arrangement to be arranged can. To the Zuleitungsanschluß Z1 schließ t itself a valve housing 1a on, in which a differential piston 2a is adjustably arranged, which is connected with the valve housing at its edges by bellows 2.3a. The differential piston 2a carries a valve disk, which is integrated into the bellows 2.3a and faces a valve seat 4a. The Zufluß anschluß Z1, thus the Druckanschluß , those flows over the valve seat 4a with the Abflu&szlig into a circular pressure chamber 3a; anschluß A1 is connected. On the side of the differential piston 2a turned away from the valve seat 4a a Steuerraum 5a is arranged, which is limited at a side by the surface of the differential piston 2a and/or by the bellows 2.3a, while the other delimitations are formed by the inner surfaces of a guide tube 8a belonging to the magnetic system, which exhibits here a widening.

In the differential piston 2a a centrically arranged axial relief passage 2.1a is, by those the Steuerraum 5a with the Abfluß anschluß A1 is connected. Further one points to the differential piston 2a auß ermittig arranged axial tax drilling 2.2a up, by which the Steuerraum 5a is connected with the pressure chamber 3a. The axial relief passage 2.1a is verschließ bar by an armature poetry 6.1a, to äuß eren end of an armature 6a is arranged, which in the guide tube 8a is adjustably led.

In similar way is the Zufluß anschluß Z2 over an accordingly mounted valve with the Abfluß anschluß A2 connected. The valve construction of appropriate construction units described above the index “b” is named the same reference numbers under adding.

The two valves of a common magnetic system St steered with a solenoid coil 7 located on a mother board 13, which an electrical Anschluß a guide tube possesses 7.1 and is arranged in their longitudinal axis, which from two escape-end to each other-standing tubing parts of 8a and 8b exists. In the two parts of 8a and 8b of the guide tube are adjustably led the two armatures 6a and 6b, at of them in each case the differential pistons 2a and 2b turned äuß eren ends the armature sealing gene 6.1a and/or 6.1b are arranged. Like the design to infer, the two armatures 6a and 6b are to both sides of the transverse centre plane of the solenoid coil 7, thus quasi mirror-symmetrically, arranged. Between them are two bolted firmly with one another head pieces 9a and 9b arranged in the guide tube, which serve as attack for the two armatures. The armatures 6a and 6b exhibit in each case at that the head pieces turned side axial drillings 6.2a and/or 6.2b, in which a return spring 11a and/or 11b is arranged in each case, which pushes over a stopper 11.1a and/or 11.1b away at the head piece 9a and/or 9b.

In the Steuerraum 5a and/or 5b of each valve 11b one is additionally coaxial on the differential pistons 2a and/or 2b in Schlie&szlig to the return spring 11a and/or; direction working screwing jerk feather/spring 12a and/or 12b arranged.

In the following on the basis valve the named the index “A” the function mode of the valve arrangement is described.

By the Zufluß anschluß Z1 under pressure inflowing medium arrives over the pressure chamber 3a and the tax drilling 2.2a into the Steuerraum 5a. The Flächenverhältnisse at the differential piston 2a are in such a way selected, daß during by the armature poetry 6.1a of locked relief passage 2.1a of the differential pistons 2a under the pressure of the medium in the Steuerraum 5a and the valve moves downward by putting the valve disk on on the valve seat 4a schließ t.

The same procedure takes place with the opposite valve via via the Zufluß anschluß Z2 inflowing medium.

If the magnetic system St is excited and opened by tightening the anchor 6the relief passage 2.1a, then a pressure balance between the Steuerraum 5a and the Abflu&szlig steps; A1 up, and the differential piston 2a lifts itself due to the pressure lining up in the pressure chamber 3a, so daß the valve opens. Since with the exciting of the magnetic system the other anchor 6b is tightened also at the same time, also the other valve opens and both media flow out of the Abfluß connections A1 and a2 out.

When ding-activate the magnetic system St the two anchors 6a and 6b become au&szlig due to the forces after return springs; EN pressed and the relief passages 2.1a and/or 2.1b again locked. Then Schlie&szlig the affecting the differential pistons 2a and/or 2b; strength sits down together from Kraft of the return spring 11a and/or 11b and Kraft of the additional coil spring 12a and/or 12b. Due to the coaxial arrangement and the parallel connection of the two screwing jerk feathers/springs 11a and 12a and/or 11b and 12b the reset spring 12a for the movement of the differential piston 2a can be dimensioned relatively small and takes over only one part of the necessary Schließ strength, which has as a consequence, daß the valve arrangement a outstanding low pressure fitness exhibits.