EP1346267A1

EP1346267A1 - Positive pressure generation device and valve

Info

Publication number: EP1346267A1
Application number: EP01271566A
Authority: EP
Inventors: Bertram Bauer; Harald Merz; Wolfgang Paessler
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2000-12-19
Filing date: 2001-11-30
Publication date: 2003-09-24
Anticipated expiration: 2021-11-30
Also published as: US20040217309A1; EP1346267B1; US7073769B2; WO2002050622A1; US6799601B2; DE50108900D1; JP2004516568A; US20030010388A1; DE10063273A1; KR20020079841A

Abstract

The invention relates to a device with which a positive pressure is at least temporarily generated in a system (S) with respect to an ambient pressure (U). The device further comprises a pump (P) with a pressure side (20) and an intake side (10). When the positive pressure is generated, the pressure side (20) communicates with the system (S) and the intake side (10) communicates with the ambient pressure via at least one valve (MV1), especially a solenoid valve. The inventive device further comprises means that provide an additional cross-section of the intake volume flow when the positive pressure is generated. The invention further relates to a valve that is especially designed for use together with the inventive device.

Description

Overpressure produces fluid and valve

The present invention relates to a device for at least temporarily applying an overpressure in a system based on an ambient pressure. generate with _. a pump having a pressure side and a suction side, wherein in the generation of an overpressure the ^'pressure side of the system and the suction side of at least one ERS tes valve, in particular a solenoid valve communicating with the ambient pressure in connection with the first valve while the Intake volume flow throttles due to its cross section. Furthermore, the present invention relates to a valve, in particular an additional valve for the device according to the invention, with a valve inlet and with a valve outlet, which can be connected to one another.

State of the art

Devices of the generic type include, for example, devices which are intended to connect the pressure side or the suction side of a compressor or a pump to a system via two solenoid valves in such a way that either an overpressure or a vacuum can be generated in the system. Known, Devices suitable for this are shown in FIGS. 1 and 2.

FIG. 1 shows a device which has a compressor or a pump P with a suction side 10 and a pressure side 20. The pressure side 20 of the pump P is assigned a check valve R, which is connected to the pressure side 20 of the pump P via a power L2. The device shown is intended to generate an overpressure or a vacuum in a system S. For this purpose, a first solenoid valve MV1 and a second solenoid valve MV2 are provided, via which the pump P can be connected to the system S in a suitable manner. The first solenoid valve MV1 and the second solenoid valve MV2 are shown in their respective rest positions. In this rest position, the system S is connected to the ambient pressure via a line L7, the second solenoid valve MV2, a line L4, a line L5, the first solenoid valve MV1 and a line L8.

In order to generate an overpressure in the system S shown in FIG. 1, the second solenoid valve MV2 is switched over. As a result, the system S is connected to the pressure side 20 of the pump P via the second solenoid valve MV2, the line L3, the check valve R and the line L2. When the second solenoid valve MV2 is in the switched position, the line L4 is closed by the second solenoid valve MV2. Line L6 is likewise closed by the first solenoid valve MV1 ^' which is in its rest position. The suction side 10 of the pump P is in overpressure operation via a line L1, a line L5, the first solenoid valve MVl and a line L8 with the ambient pressure U in connection.

In order to generate a negative pressure in the case shown in Figure 1 system S, is based on the representation of Figure 1, the first solenoid valve MVl switched while the second ^'solenoid valve MV2 remains in the position shown in Figure 1 rest position. In this position, the first solenoid valve MVl the line L5 is completed by the first solenoid valve MVL while the line L6 is connected by the first solenoid valve MVl with ^'of the line L8 and thus with ambient pressure. Thus, the pressure side 20 of the pump P is connected to the ambient pressure via the line L8, the first solenoid valve ^' MVl, the line L6, the line L3, the check valve R and the line L2. The system _. S is connected to the suction side 10 of the pump P via the line L7, the second solenoid valve MV2, the line L4 and the line Ll. As mentioned, in the generic device according to FIG. 1, the system S is connected to the ambient pressure U when the first solenoid valve MV1 and the second solenoid valve MV2 are in their rest position.

In contrast to this, it is provided in the likewise known device according to FIG. 2 that the system S is sealed when the solenoid valves are in their rest position, as will be explained in more detail below

Becomes. The device according to FIG. 2 also has a pump P with a suction side 10 and a pressure side 20. The pump P is again assigned a check valve R, which is connected to the pressure side 20 via a line L12 the pump P is connected. The system in which the overpressure or the underpressure is to be generated is again identified by S, the ambient pressure being indicated by U. The device has a first solenoid valve MV1 and a second solenoid valve MV2, the respective rest positions of which are shown in FIG. In these rest positions, the line L17 is closed by the second solenoid valve MV2, while the line L15 is closed by the first solenoid valve MV1. As a result, the system S is sealed in the rest position of the first solenoid valve MV1 and the second solenoid valve MV2.

In order to generate an overpressure in the system S, the second magnetic valve MV2 is switched over in the device according to FIG. 2, while the first magnetic valve MV1 remains in the rest position shown in FIG. When the second solenoid valve MV2 is switched, the system S is connected to the pressure side 20 of the pump P via the line L17, the second solenoid valve MV2, the line L13, the check valve R and the line L12. The line L15 is closed by the first solenoid valve MV1, just as the line L14 is closed by the second solenoid valve MV2. The suction side 10 of the pump P is connected to the ambient pressure U during the overpressure operation via the line Lll, the first solenoid valve MVl and the line L16.

In order to generate a negative pressure in the system S with the device according to FIG. 2, the first solenoid valve MV1 is switched over with reference to the illustration in FIG. 2, while the second solenoid valve MV2 remains in its rest position. System S is thereby cut the line L17 closed by the second solenoid valve ^' MV2, the line L15, the first solenoid valve MVl and the line Lll connected to the suction side 10 of the pump P. The pressure side 20 of the pump P protrudes ^" during negative pressure operation, the line L12, the check valve R, the line L13, the second solenoid valve MV2, the line L14 and a section of the line L16 closed by the first solenoid valve MVl with the ambient pressure U. in connection.

A disadvantage of the known devices shown in FIGS. 1 and 2 is that the intake volume flow is throttled by the respective first solenoid valve MV1 on the suction side, as a result of which the compressor or the pump P achieves a lower pneumatic output. An obvious solution to this problem, namely to avoid the undesired throttling of the intake volume flow by providing the suction-side solenoid valve with a sufficiently large cross section, brings with it further problems. Such a valve with a sufficiently large cross section requires large dimensions, is heavy and therefore expensive. In addition, in many cases it is desirable to use the same or similar valves on both the pressure and suction side.

Advantages of the invention

The fact that the device according to the invention provides means which, when an excess pressure is generated, provides an additional cross section for the intake volume flow Semi filters can ^'be achieved a higher pneumatic power to the pump. Furthermore, the dimensions and the weight of the first valve need not be increased and, if a second valve is provided, the same or similar first and second valves can be used.

A preferred embodiment of the device according to the invention provides that the means comprise at least one additional valve which is connected parallel to the first valve when an overpressure is generated. The cross section available for the intake volume flow can thereby be enlarged by the cross section of the additional valve.

In particular if the first valve is a solenoid valve, it is preferred that the additional valve is opened by an overpressure generated in the system. In this way, it is not necessary to provide additional energy sources for actuating the additional valve, but it is sufficient, for example, to connect a line leading to the system or the system itself to the additional valve in a suitable manner.

The device according to the invention preferably further provides that the additional valve is closed when the pressure in the system decreases, preferably automatically, for example by the decreasing pressure itself.

In a preferred embodiment of the device according to the invention, a second valve, in particular a solenoid valve, is provided, the pressure side of the pump when generating ^• the excess pressure is connected to the system via the second valve.

In this case in particular, the device according to the invention can furthermore be suitable for generating a negative pressure in the system in relation to the ambient pressure. It can be provided that when the negative pressure is generated, the pressure side of the pump is connected to the ambient pressure via the first valve, while the suction side of the pump is connected to the system via the second valve. As a result, the disadvantages of the prior art explained at the beginning with reference to FIGS. 1 and 2 can be eliminated.

In certain embodiments of the inventive device can be provided ^'that the additional valve additionally has the function of a relief valve in the generation of an overpressure. This embodiment is particularly useful when the additional valve is connected to the system via a line and as a result the pressure conditions in at least one area of the additional valve are approximately the same as in the system.

The present invention further relates to a valve, in particular an additional valve for the device according to the invention, as was already mentioned at the beginning. According to the invention, it is provided in this valve that the valve has a control pressure inlet that is connected to a control chamber and that the valve inlet is connected to the valve outlet when a predetermined pressure is exceeded in the control chamber. Based on the device according to the invention Such a valve can be actuated, for example, by the pressure prevailing in the system, and can thus provide an additional cross section for the intake volume flow when generating an excess pressure, without additional energy sources being required to actuate the valve.

In the valve according to the invention, it is preferably provided that the valve inlet is connected to the valve outlet by a spatial expansion of the control chamber.

For this purpose, the control room can be delimited, for example, by a membrane, which enables the spatial expansion of the control room. The control chamber can be formed, for example, by a housing that is open on one side, the open side of the control chamber then being delimited by the membrane. The housing can of course have suitable connections, for example to enable a connection of the control room to a system in which an overpressure is to be generated.

In the valve according to the invention it can further be provided that a valve chamber is provided on the side of the membrane facing away from the control chamber, which is connected to a valve outlet, and that the valve chamber is sealed with respect to the valve inlet when the membrane is at rest.

In this case in particular, it can be advantageous if the valve chamber has a valve seat which is connected to a valve disc cooperates. The valve seat and the valve disk result in a mutual seal when the valve is closed.

In this context, it can further be provided that the membrane acts on the valve disk when the control chamber is spatially expanded in such a way that the valve chamber is connected to the valve inlet. For this purpose, the valve disk is usually moved away from the valve seat.

In this connection, the membrane can act on the valve plate, for example, via a rod-shaped element.

The membrane and / or the rod-shaped element and / or the valve plate can be formed in one piece.

Furthermore, the membrane and / or the rod-shaped element and / or the valve plate can be made of a rubber-elastic. Material be formed. However, the rod-shaped element must also be designed stiff enough in this embodiment in order to be able to transmit the required force from the membrane to the valve disk.

In a preferred embodiment of the valve according to the invention it is further provided that the valve connects the control pressure inlet to the valve inlet and / or the valve outlet when a maximum pressure in the control chamber is exceeded. In this way, the valve according to the invention can additionally fulfill the function of a pressure relief valve. For this purpose in particular, it can be provided that a support plate acts on the membrane in order to seal the control space through the membrane with respect to the valve chamber, as long as the maximum pressure in the control chamber is not exceeded.

The support plate can be pretensioned by a spring element, for example a spiral spring, in order to act on the membrane in a suitable manner. If the valve according to the invention also realizes the function of a pressure relief valve, the maximum pressure at which the pressure relief valve opens can be influenced by the spring force of such a spring element.

In particular, in order to ensure a seal with respect to the valve inlet and / or the valve outlet in the rest position of the valve, it can be provided that the valve disk is pretensioned in the direction of the valve seat by a spring element.

drawings

The invention is explained in more detail below with reference to the accompanying drawings.

Show it:

1 shows a first embodiment of a generic device according to the prior art, FIG. 2 shows a second embodiment of a generic device according to the prior art,

FIG. 3 shows a first embodiment of the device according to the invention,

FIG. 4 shows a second embodiment of the device according to the invention,

FIG. 5 shows a schematic illustration of an embodiment of the valve according to the invention in its rest position, in which the valve is closed,

Figure 6 shows the valve of Figure 5 in a working position in which the valve is open, and

Figure 7 shows a possible practical embodiment of the valve according to the invention.

Description of the embodiments

FIG. 3 shows an embodiment of the device according to the invention, which is obtained when the basic idea of the present invention is applied to the device according to the prior art shown in FIG. 1. The embodiment according to FIG. 3 therefore shows (again) a device which has a compressor or a pump P with a suction side 10 and a pressure side 20. The pressure side 20 of the pump P is assigned a check valve R, which has an output L2 the pressure side 20 of the pump P is connected. The device shown is intended to generate an overpressure or a vacuum in a system S. For this purpose, a first solenoid valve MV1 and a second solenoid valve MV2 are provided, via which the pump P can be connected to the system S in a suitable manner. The first solenoid valve MV1 and the second solenoid valve MV2 are shown in their respective rest positions. In this rest position, the system S is connected to the ambient pressure via a line L7, the second solenoid valve MV2, a line L, a line L5, the first solenoid valve MV1 and a line L8.

In order to provide an additional cross section for the intake volume flow when generating an excess pressure, an additional valve ZV is also provided in the embodiment shown in FIG. 3, which is connected in parallel to the first solenoid valve MV1 via two lines L9, L10. The additional valve can be formed by a valve according to the invention, in which case line L9 is connected to the valve outlet of the additional valve, while line L10 is connected to the valve inlet of additional valve ZV. In this case, the control chamber of the additional valve ZV is connected to the system S or a line L7 leading to it via a control line SL. In the rest position of the additional valve ZV shown in FIG. 3, both the line L9 and the line L10 are closed by the additional valve ZV. The generation of an overpressure begins at the one shown in FIG

Device by switching the second solenoid valve MV2, the first solenoid valve MV1 in its rest position remains. The additional valve ZV is initially still closed. When the second valve MV2 is switched, the pressure side 20 of the pump P is connected to the system S via the line L2, the check valve R, the line L3, the second solenoid valve MV2 and the line ^" L7. The suction side 10 of the pump P is closed at this point in time via the line L1, the first solenoid valve MV1 and the line L8 in connection with the ambient pressure, as has already been explained. By operating the pump P, an overpressure is built up in the system S in relation to the ambient pressure, which is via the control line SL is also supplied to the additional valve ZV. As soon as the overpressure in the system S and thus in a region of the additional valve ZV, for example a control room, exceeds a predetermined value, the additional valve ZV opens by opening its valve with its valve outlet and thus the Connects lines L9 and L10, thereby creating an additional cross-section, namely the cross-section of the additional valve ZV, for the intake vol internal flow provided so that the throttling of the intake volume flow through the first solenoid valve MVl no longer has a negative effect. As soon as the overpressure in the system S and thus in the additional valve ZV decreases again, the additional valve ZV returns to its rest position, in which the lines L9 and L10 are closed.

The additional valve ZV has on the generation of a negative pressure in the system S has no effect, since it is held by generating a negative pressure in its illustrated rest position, ^'in which the lines are closed off by the additional valve ZV L9 and L10. In order in the system S To generate a vacuum, the first solenoid valve MV1 is (also) based on the illustration in FIG. 3 switched over, while the second solenoid valve MV2 and the additional valve ZV remain in the rest position shown in FIG. In this position of the first solenoid valve MVl, the line L5 is closed by the first solenoid valve MVl, while the line L6 is connected by the first solenoid valve MVl to the line L8 and thus to the ambient pressure. The pressure side 20 of the pump P is thus connected via the line L8, the first solenoid valve MV1, the line L6, the line ^' L3, the check valve R and the line L2. Ambient pressure in connection. The system S is connected via the line L7, the second solenoid valve MV2, the line L4 and the line L1 to the suction side 10 of the pump P.

FIG. 4 shows a device which can be obtained by applying the basic idea of the present invention to the known device from FIG. 2, according to which the system S is sealed when the solenoid valves are in their rest position. The device according to FIG. 4 therefore also has a pump P with a. Suction side 10 and a pressure side 20. The pump P is again assigned a check valve R, which is connected to the pressure side of the pump P via a line L12. The system in which the overpressure or the underpressure ^{• is} to be generated is again identified with S, the ambient pressure being indicated with U. The device has a first solenoid valve MV1 and a second solenoid valve MV2, the respective rest position of which is shown in FIG. The line is in this rest position L17 is closed by the second solenoid valve MV2, while the line L15 is closed by the first solenoid valve MV1. As a result, the system S is sealed in the rest position of the first solenoid valve MV1 and the second solenoid valve M 2.

In the embodiment according to FIG. 4, too, the means which provide an additional cross section for the intake volume flow when an excess pressure is generated are formed by an additional valve ZV, which, like in the embodiment according to FIG. 3, can be formed by a valve according to the invention. Starting from the illustration according to FIG. 4, in which both the additional valve ZV, the first solenoid valve MV1 and the second solenoid valve MV2 are in the respective rest position, the generation of an overpressure in the system S begins with the switching over of the second solenoid valve MV2. This connects the system S via the line L17, the second solenoid valve MV2, the line L13, the check valve R and the line L12 to the pressure side 20 of the pump P, while the suction side 10 of the pump P via line Lll, the first solenoid valve MVl and line L16 are connected to the ambient pressure. First, the additional valve ZV is closed as mentioned, that is, it closes the lines L18 and L19, via which it is connected in parallel to the first solenoid valve MV1. At least one area of the additional valve ZV, for example a control room, is connected to the system S or to a line L17 leading to it via a control line SL. As soon as the pressure in the system S and thus in a region of the additional valve ZV exceeds a certain pressure, the additional valve opens. til ZV and connects the lines L18 and L19, which provides the additional cross section for the intake volume flow, so that the throttling of the intake volume flow through the first solenoid valve MVl no longer has a negative effect. As soon as the pressure in the system S or a corresponding area in the additional valve ZV decreases again, the additional valve ZV returns to its rest position in which it is. Lines L18 and L19 are closed, as shown in FIG. 4.

In this embodiment, too, the additional valve ZV has no effect on the generation of a negative pressure in the system S ^' , since it remains in the rest position shown, in which it closes the lines L18 and L19. In order to generate a negative pressure in the system S with the device according to FIG. 4, the first solenoid valve MV1, based on the illustration in FIG. 4, is therefore switched over, while the second solenoid valve MV2 and the additional valve ZV remain in the rest position. As a result, the system S is connected to the suction side 10 of the pump P via a section of the line L17 closed by the second solenoid valve MV2, the line L15, the first solenoid valve MVl and the line Lll. The pressure side 20 of the pump P is connected to the ambient pressure U during the negative pressure operation via the line L12, the check valve R, the line L13, the second solenoid valve MV2, the line L14 and a section of the line L16 closed by the first solenoid valve MVl , FIG. 5 shows a schematic illustration of a valve according to the invention, which can be used, for example, as an additional valve in the device according to FIG. 3 and the device according to FIG. 4. According to the representation of Figure 5, the valve is in the rest position in which it is closed. In this closed position, valve inlet 100 and valve outlet 101 are not connected to one another. A valve housing, designated overall by 110, forms, among other things, the lower section of a control chamber 103 _, into which a control pressure inlet 102 opens. The control chamber 103 is bounded at the top by a diaphragm 104 having its periphery fixed under seal to _the, housing 110th A valve chamber 105 is located above the membrane 104, into which the valve outlet 101 opens. The valve chamber 105, which is closed according to the illustration in FIG. 5, forms a valve seat 108 through its upper end section. A valve plate 107 interacts with the valve seat 108 and is connected to the membrane 104 by a rod-shaped element 106. In the illustrated embodiment, the valve disk 107 on the valve seat, biased by a spring member 109, so that ^'a good seal between valve plate 107 and valve seat 108 is obtained. In the embodiment according to FIG. 5, a valve inlet chamber 111 is provided, into which the valve inlet 100 opens. Such a valve inlet chamber 111 can be dispensed with, for example, if the valve inlet is to be formed by the valve environment. Due to the fact that a spring 109 prestresses the valve plate 107 in the direction of the valve seat 108, both the valve inlet 100 and the valve outlet 101 are sealed in the rest position of the valve. FIG. 6 shows the valve from FIG. 5 in a working position in which the valve inlet 100 is connected to the valve outlet 101. As a result of an overpressure in the control chamber 103, the diaphragm 104 has deformed such that it acts on the valve plate 107 via the rod-shaped element 106 in such a way that the valve plate 107 is lifted from the valve seat 108 against the bias by the spring 109. As a result, the valve inlet 100 is connected to the valve outlet 101 ^' via the valve inlet chamber ^' 111 and the valve chamber 105, so that the valve is in the open state. As soon as the overpressure in control chamber 103 decreases again, diaphragm 104 returns to its rest position, as a result of which valve plate 107 lowers and rests on valve seat 108 with a seal.

FIG. 7 shows a sectional view of a possible practical embodiment of the valve according to the invention. The valve again has a housing designated overall by 110. A valve outlet 101 opens into a valve chamber 105. In the embodiment according to FIG. 7, the valve inlet 100 is formed by a distance (not shown) between the valve plate 107 and the valve seat 108, which is created when the valve opens. A control pressure inlet 102 opens into a control chamber 103, which is delimited at the top by a membrane 104. In the embodiment according to FIG. 7, the valve also works as a pressure relief valve. ^" For this purpose, a support plate 112 is provided which, under the action of a spring 113, acts on the outer region of the membrane 104 in such a way that it counteracts the control chamber 103 during normal operation. seals over the valve chamber 105. The operation for connecting the inlet valve 100 with the valve outlet 101 of the valve illustrated in Figure 7 ^'corresponds to the operation, as explained with reference to FIGS 5 and 6. FIG. As soon as the pressure in the control chamber 103 exceeds a certain value, the membrane 104 deforms in such a way that the rod-shaped element 106 and the valve plate 107 formed integrally therewith are moved upward, so that the mentioned distance between the valve plate 107 and the valve seat moves 108 results. When the pressure in the control chamber 103 exceeds a predetermined maximum pressure, the peripheral portion moves the membrane 104 against the force exerted by the spring 113 bias upward and thus connects the control pressure inlet 102 with ^• the valve outlet 101, so that the function of a relief valve obtained becomes. In the embodiment according to FIG. 7, the valve plate 107 is formed in one piece with the rod-shaped element 106, for example from a rigid plastic material, while the membrane 104 is formed from an elastic material. However, embodiments are also conceivable in which, for example, the membrane 104, the rod-shaped element 106 and the valve plate 107 are formed in one piece from a material which is elastic at least with a thin cross section, in order to take over the function of the membrane 104.

In the above description, the first valve and the second valve have been described in the form of corresponding solenoid valves. However, the invention is not based on the

Limited use of such solenoid valves, but can be implemented with any other valves, for example pneumatic valves.

The medium flowing through the lines of the device according to the invention and the medium contained in the system S, the pressure of which is to be increased or decreased, can be the same or different. Particularly if these media differ, suitable separation devices, for example in the form of a membrane or the like, can be provided in the system S. All suitable liquid or gaseous substances can be considered as the flow medium.

The ambient pressure U need not necessarily be an atmospheric ambient pressure, but any pressure prevailing in another system can also be considered as the ambient pressure.

The preceding description of the exemplary embodiments according to the present invention is only for illustrative purposes and not for the purpose of restricting the invention. Various changes and modifications are possible within the scope of the invention without leaving the scope of the invention and its equivalents.

Claims

Expectations

1. Device for generating a positive pressure in a system (S) at least temporarily with respect to an ambient pressure (U), with a pump (P) which has a pressure side (20) and a suction side (10), during the generation an overpressure the pressure side (20) with the "system (S) and the suction side (10) via at least a first valve (MVl), in particular a solenoid valve, is connected to the ambient pressure (U), - the first valve (MVl ) throttles the intake volume flow due to its cross section, characterized in that means (ZV) are provided which provide an additional cross section for the intake volume flow when an overpressure is generated.

2. Device according to claim 1, characterized in that the means comprise at least one additional valve (ZV) which is connected in parallel to the first valve (MVl) when generating an excess pressure.

3. Device according to one of the preceding claims, characterized in that the additional valve (ZV) is opened by an overpressure generated in the system.

4. Device according to one of the preceding claims, characterized in that the additional valve (ZV) is closed as the pressure in the system (S) decreases.

5. Device according to one of the preceding claims, characterized in that a second valve (MV2), in particular a solenoid valve, is provided, and that the pressure side of the pump (P) when generating the excess pressure via the second valve (MV2) with the System (S) communicates.

6. Device according to one of the preceding claims, characterized in that it is furthermore suitable for generating a negative pressure in the system (S) in relation to the ambient pressure (U), and that the pressure side (20) of the pump when generating the negative pressure (P) is connected to the ambient pressure (U) via the first valve (MVl) while the suction side of the pump (P) is connected to the system (S) via the second valve (MV2).

7. Device according to one of the preceding claims, characterized in that the additional valve (ZV) additionally has the function of a pressure relief valve when generating an overpressure.

8. Valve, in particular additional valve for a device according to one of the preceding claims, with a valve inlet (100) and with a valve outlet (101), which can be connected to one another, characterized in that the valve has a control pressure inlet (102) with a Control room (103) communicates, and that the valve inlet (100) is connected to the valve outlet (101) when a predetermined pressure is exceeded in the control chamber (103).

9. Valve according to claim 8, characterized in that the valve inlet (100) is connected to the valve outlet (101) by a spatial expansion of the control chamber (103).

10. Valve according to one of claims 8 to 9, dadurcli characterized in that the control chamber (103) is delimited by a membrane (104) which enables the spatial expansion of the control chamber (103).

11. Valve according to one of claims 8 to 10, characterized in that on the side of the diaphragm (104) facing away from the control chamber (103) a valve chamber (105) is provided which is connected to the valve outlet (101), and that the valve chamber (105) is sealed against the valve inlet (100) when the membrane (104) is at rest.

12. Valve according to one of claims 8 to 11, characterized in that the valve chamber (105) has a valve seat (108) which cooperates with a valve plate (107).

13. Valve according to one of claims 8 to 12, characterized in that the membrane (104) acts on the valve plate (107) in the case of a spatial expansion of the control chamber (103) such that the valve chamber (105) with the valve inlet (100) is connected.

14. Valve according to one of claims 8 to 13, characterized in that the membrane (104) acts on the valve plate (107) via a rod-shaped element (106).

15. Valve according to one of claims 8 to 14, characterized in that the membrane (104) and / or the rod-shaped element (106) and / or the valve plate ^' (107) are integrally formed.

16. Valve according to one of claims 8 to 15, characterized in that the membrane (104) and / or the rod-shaped element (106) _. and / or the valve disk (107) is formed from a rubber-elastic material.

17. Valve according to one of claims 8 to 16, characterized in that the valve connects the control pressure inlet (102) with the valve inlet (100) and / or the valve outlet (101) when a maximum pressure in the control chamber (103) is exceeded ,

18. Valve according to one of claims 8 to 17, characterized in that a support plate (112) on the membrane

(104) acts to seal the control chamber (103) through the membrane (104) against the valve chamber (105) as long as the maximum pressure in the control chamber (103) is not exceeded.

19. Valve according to one of claims 8 to 18, character- ized in that the support plate (112) is biased by a spring element (113) to act on the membrane (104).

20. Valve according to one of claims 8 to 19, characterized in that the valve plate (107) is biased by a spring element (109) in the direction of the valve seat (108).