Pneumatic valve

Abstract

A pneumatic valve having a housing in which a valve chamber is arranged, the valve chamber having a first opening connected to a first housing gas port, a second opening connected to a second housing gas port, and a third opening connecting the valve chamber to an actuator chamber, the actuator chamber being connected to a third housing gas port, an SMA actuator with a movable closing element is arranged in the housing, the closing element is formed by a plunger, the plunger extends through the third opening, a sealing plate is formed at the end of the plunger extending into the valve chamber, and a first sealing element for closing the first opening and a second sealing element for closing the third opening are arranged at the position of the sealing plate. An elastic element is operatively connected to the closing element, the elastic element urges the second sealing element in the direction of the third opening when the pneumatic valve is in an active state, and the plunger and the actuator are connected with a form fit with a gap through the driving element, so that actuation of the actuator causes the plunger to move in the range of the gap through the actuator.

Description

Technical Field

[0001] The present invention relates to a pneumatic valve, which has a housing in which a valve chamber is arranged, the valve chamber having a first opening for connecting to a first housing gas port, a second opening for connecting to a second housing gas port, and a third opening for connecting the valve chamber to an actuator chamber, the actuator chamber being connected to the third housing gas port, wherein an SMA actuator having a movable closing element is arranged in the housing, wherein the closing element is formed by a plunger, which extends through the third opening and a plate is formed at the end of the plunger extending into the valve chamber, wherein a first sealing element for closing the first opening and a second sealing element for closing the third opening are arranged on the plate, wherein an elastic element is operatively connected to the closing element, and when the pneumatic valve is in an activated state, the elastic element pushes the second sealing element in the direction of the third opening. Background Art

[0002] Such a pneumatic valve is known from DE 10 2018 216 874 A1 and DE 10 2019 208 051 A1. In these valves, the first opening of the valve chamber is closed by a first sealing element when the actuator is in an unactivated state. When the actuator is in an activated state, the plunger is intended to be pushed away from the first opening toward the third opening by the force of the elastic element, as a result of which the third opening is closed by a second sealing element. The first sealing element and the second sealing element can be formed integrally from a soft material and connected to the plunger formed from a harder material. However, the first sealing element and the second sealing element can also be arranged on a plate, which is formed at the end of the plunger that is located in the valve chamber.

[0003] Such pneumatic valves are used, for example, in vehicles to adjust seat contours using fillable elastic cushions. For this purpose, the cushions are usually filled with air as the gas. An electrically actuated pneumatic valve is used to control the air supply. Static contour adjustment functions require long hold times (hours to days), placing stringent demands on the airtightness of the associated pneumatic valves.

[0004] If the valve remains closed for an extended period, the sealing element may become more adhered to the nozzle seat, possibly due to environmental influences (e.g., temperature fluctuations). When the valve is subsequently activated, the sealing element may not be released by a resilient element (e.g., an internal spring) that assists in opening the valve, or may not release within the specified timeframe. Furthermore, if it is desired to overcome a pressure differential at certain operating points to open the valve, additional force may be required to open the valve.

[0005] The increasingly common shape memory alloy (SMA) actuators have only a small force reserve, especially when subjected to multiple actuations. As disclosed in the aforementioned document, if an internal spring is to be used to assist opening and exert sufficient force on the sealing element, the SMA actuator must additionally apply this force during each valve actuation. This shortens the lifespan of the SMA actuator. In contrast, occasionally applying a higher force (for example, only for the first actuation after a relatively long hold time) seems reasonable in terms of its impact on the lifespan of the SMA actuator.

[0006] DE 10 2018 112 090 A1 describes an SMA actuator that is used in such a way that when the sealing element needs to be actively pulled away from the nozzle seat, the actuator applies an increased opening force to the sealing element. However, for this purpose, the SMA actuator must be located in the pressure chamber of the valve.

[0007] DE 10 2017 213 744 B3 discloses a pneumatic valve in which the sealing element is moved by a rotational movement. Thus, separation from the nozzle seat is assisted by a peeling movement.

[0008] DE 10 2022 207 882 A1 describes a one-piece non-return valve which can be opened by means of the intake pressure against a strong return spring.

[0009] DE 10 2023 203 271 A1 describes a valve arrangement in which a 3 / 3-way valve is formed from an interconnected 3 / 2-way valve and a 2 / 2-way valve. In this case, the SMA actuator is located in a pressure-free chamber (ie, ambient pressure).

[0010] DE 10 2022 202 438 A1 and DE 10 2016 219 342 A1 both disclose pneumatic valves with SMA wire actuators.

[0011] DE 10 2016 112 115 A1 discloses a valve linear drive for connection to a valve body having a valve seat, the valve linear drive having a positive connection with play between a driver element and a pull part. Summary of the Invention

[0012] The object of the present invention is to specify a valve having an SMA actuator at ambient pressure, wherein opening can be actively assisted by the actuator. Optionally, the intention is to limit this additional force in order to protect the actuator.

[0013] This object is achieved by a pneumatic valve of the type in question, wherein the plunger and the actuator have a form-fitting connection with play via a driver element, so that actuating the actuator causes the plunger to be moved by the actuator within the range of the play.

[0014] Therefore, the actuator device is configured so that it can apply both a pushing force and a pulling force to the plunger in order to close the first opening or assist in separating the first sealing element from the first opening. However, due to the clearance of the driving element, the force of the actuator is only used when the first sealing element is difficult to release from its sealing seat at the first opening so that the existing elastic force is insufficient for this purpose.

[0015] In the design of pneumatic valves, the actuator also has:

[0016] A printed circuit board, which is arranged in the actuator chamber; an operating element, which is arranged in the actuator chamber and has an operating section for acting on the plunger and a bent section connected to the operating section and the printed circuit board; and an actuator element, which is arranged in the actuator chamber and has a first end mechanically connected to the operating section and a second end mechanically and electrically connected to the printed circuit board, wherein the actuator element is designed to cause the operating element to enter a first state when it is in an unpowered state, in which the actuator element pushes the plunger onto the first opening, and the actuator element is designed to cause the operating element to enter a second state when it is in an energized state, in which the operating section does not exert any thrust on the plunger, and therefore, due to the action of the driving element and the elastic element, the second sealing element is pulled or pushed toward the third opening.

[0017] When the SMA actuator is actuated (i.e., when the actuator element is energized), the actuator element is shortened, causing the operating section of the operating element to be pulled away from the plunger and no longer exerting direct force on the plunger. Due to the elastic force of the elastic element, the plunger then pushes or pulls the first sealing element fastened to the elastic element away from the first opening and pushes or pulls the second sealing element toward the third opening. However, if the first sealing element adheres to the sealing seat of the first opening, the driving element engages the plunger after overcoming the gap and, in addition to the elastic force, pulls the sealing element away from the first opening. The elastic element then again takes over the movement of the plunger, and the operating element no longer exerts force on the plunger.

[0018] In an advantageous embodiment of the pneumatic valve, the elastic element is formed by a coil spring in or outside the valve chamber, which is supported on a housing part or an enclosure and pushes the plunger from the second opening to the third opening.

[0019] In principle, any other suitable spring can also be used, but a helical spring is advantageous due to its generally concentric design with respect to the valve chamber.

[0020] In an alternative embodiment of the pneumatic valve, the elastic element is formed by a leaf spring which is formed on the actuating section of the actuator and also serves as a driver element.

[0021] In this way, the force of the entrainment element can be adjusted via the spring constant, so that a maximum force is generated only in the case of a maximum deflection of the leaf spring, which decreases again during the displacement of the plunger or the sealing element.

[0022] Advantageously, the entrainer element is fixedly connected to the operating section of the actuator and movably connected to the plunger in such a way that when the actuator is actuated, the entrainer element is entrained with the operating section and, after reaching the end of the gap, the plunger.

[0023] In this case, the entrainer element can be rod-shaped and can be inserted into the recess of the operating section and the recess of the plunger part and have a widened portion at its end with a larger cross section than the cross section of the recesses.

[0024] In this way, the entrainer element is initially movable, but due to the widening portion its movement is blocked and it cannot slide through / out of the recesses and can therefore exert its action on the plunger and thus a pulling force when the end of the gap is reached.

[0025] Alternatively, the entrainer element can also be fixedly connected, for example, to the operating section of the actuator.

[0026] This can be advantageous in terms of production and also prevents the entrainment element from falling out.

[0027] The driver element can also be fixedly connected to an elastic element arranged outside the valve chamber, which advantageously reduces the number of separate parts.

[0028] The driver element may have an elastic section, as a result of which a variable force is exerted on the plunger when the actuator is actuated.

[0029] Therefore, the actuator device is designed so that it can apply a downward pushing force and an upward pulling force to the plunger.The actuator device can be formed integrally or as an assembled component. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The invention is described in more detail below based on exemplary embodiments with the aid of the accompanying drawings, in which:

[0031] Figure 1A first design variant of the pneumatic valve according to the invention is shown in the unactuated state,

[0032] Figure 2 A first design variant of the valve is shown in the actuated state during the filling process,

[0033] Figure 3 shows a detailed view of a pneumatic valve according to the invention in an unactuated state,

[0034] Figure 4 A detailed view of a first design variant of the valve is shown in an actuated intermediate state,

[0035] Figure 5 A detailed view of a first design variant of the valve is shown in the final open state,

[0036] Figure 6 shows a detailed view of a second design variant of the pneumatic valve according to the invention in the unactuated state,

[0037] Figure 7 A detailed view of a second design variant of the valve is shown in an actuated intermediate state,

[0038] Figure 8 A detailed view of a second design variant of the valve is shown in the final open state,

[0039] Figure 9 A detailed view of a third design variant of the pneumatic valve according to the invention is shown in the unactuated state,

[0040] Figure 10 A detailed view of a third design variant of the valve is shown in an actuated intermediate state,

[0041] Figure 11 A detailed view of a third design variant of the valve is shown in the final open state. DETAILED DESCRIPTION

[0042] Figure 1 A cross-sectional view of a pneumatic valve is shown, which comprises a housing 1 having a first housing part 17, which in the exemplary embodiment shown is designed as a base plate. The housing 1 also comprises a second housing part 18, which is designed as a cover, and finally a third, cup-shaped housing part 19, which is designed as an insert between the first and second housing parts 17, 18 and on which a supply port 27 and a connection port 28 are formed. An actuator chamber 30 is formed between the third housing part 19 and the second housing part 18, in which the actuator 6 is mounted.

[0043] The valve chamber 2 is formed in the third housing portion 19 by having a pot-shaped shaped portion into which is inserted an enclosure 2a serving as a cover for the valve chamber 2. The connection between the pot-shaped shaped portion and the enclosure 2a is achieved, for example, by a press fit or a seal. It may be advantageous to absorb the pressing and sealing forces by means of a latch, threaded fastening, or the like.

[0044] The valve chamber 2 has a first opening 3, a second opening 4 and a third opening 5. In the exemplary embodiment shown, the first opening 3 and the second opening 4 are formed in the third housing part 19 and the third opening 5 is formed in the enclosure 2a that closes the valve chamber 2. Thus, gas, for example compressed air, can be guided into the housing 1, for example from a compressor via the supply port 27, wherein the compressed air can enter the valve chamber 2 via the first opening 3 and from the valve chamber via the second opening 4 and the connection port 28 into the air cushion that can be connected to the connection port. On the other hand, compressed air from the air cushion can reach the valve chamber 2 via the connection port 28 and the second opening 4 and return from the valve chamber to the supply opening and be discharged in the absence of a higher pressure at the supply opening.

[0045] If the pneumatic valve is not actuated, compressed air can pass from the air cushion connected to the connection port 28 via the connection port 28 and the second opening 4 into the valve chamber 2 and from the valve chamber via the third opening 5 into the actuator chamber 30. An outlet opening 29 for connection to, for example, ambient air is formed in the second housing part 18, through which air from the air cushion can then enter the surrounding environment.

[0046] The closing element is formed in the valve chamber 2 by the plunger 7. A sealing plate 11 is arranged or molded at the end of the plunger that extends into the valve chamber 2. A first sealing element 11a is arranged (e.g., molded, adhered, or otherwise fastened) on the side of the sealing plate 11 facing the first opening 3, and a second sealing element 11b is arranged (e.g., molded, adhered, or otherwise fastened) on the side facing the third opening 5. The sealing plate 11, together with the sealing elements 11a and 11b, can be made of a softer material than the plunger 7.

[0047] A widening 8 is formed at the end of the plunger 7 that projects out of the valve chamber and forms a point of engagement for the entrainment element 20 due to its overlap with the plunger pin.

[0048] exist Figure 1 and Figure 2In the exemplary embodiment shown, an elastic element 10, for example in the form of a coil spring, is arranged in the valve chamber 2. One end of the elastic element 10 is supported on the wall of the valve chamber 2 in the region of the first opening 3, while the other end of the elastic element is supported on a sealing plate 11. When the valve is activated, the elastic element 10 is intended to push the sealing plate 11 away from the first opening 3 and thus open it. In the final state, the elastic element 10 pushes the second sealing element 11b onto the third opening 5 and seals it.

[0049] Furthermore, an actuator 6 is arranged in the housing 1. The actuator 6 is formed by a printed circuit board 12, which is mounted on corresponding struts of the third housing part 19 and mechanically connected to the corresponding struts of the third housing part. An operating element 13 is connected to the printed circuit board 12 and has an operating section 14 that is in direct contact with the plunger 7 and a bent section 15 that is connected to the printed circuit board 12.

[0050] The actuator 6 further comprises an actuator element 16, which is preferably formed using a wire made of a shape memory alloy, which contracts when loaded with an electric current supplied by a circuit (not shown) on the printed circuit board 12. In the inactive state, the operating element 13 is preloaded / prestressed so that the operating element 13 pushes its operating section 14 against the plunger 7 and thus pushes the sealing plate 11 and the first sealing element 11a optionally attached thereto onto the first opening 3 against the force of the elastic element 10.

[0051] The actuator element 16 is connected both to the operating element 13 and to the printed circuit board 12 , for example by means of a crimp connection.

[0052] Advantageously, the actuator element 16 is formed above the upper side of the printed circuit board 12, and the operating element 13 is formed below the lower side of the printed circuit board 12, resulting in a very compact design. In principle, the design can also be mirror-inverted, so that the actuator element 16 is located below the printed circuit board 12 and the operating element 13 is located above the printed circuit board 12.

[0053] Advantageously, a final position detection element 26 is formed on the operating element 13, which contacts the printed circuit board 12 when the actuator 6 is actuated and enables current to flow, as a result of which reaching the final position is detected, so that the current can be shut off or at least reduced by the actuator element 16 so that the actuator element is not overloaded.

[0054] The pneumatic valve has a driving element 20. Figure 1 and Figure 2In the exemplary embodiment of the invention, the entrainment element is fixedly connected to the operating section 14 of the operating element 13, for example, is formed in or on the operating section. However, the entrainment element can also be glued, soldered or welded. Other suitable connection methods are possible.

[0055] The plunger 7 has a widening 8 or step at its upper end, preferably as part of a hard component. A driver element 20 can engage with the widening 8 from below in a form-fitting manner and thus exert a tensile force on the plunger 7. Alternatively, the plunger 7 can also have a corresponding recess into which the driver element 20 can engage. The lower end of the plunger 7 contains sealing elements 11a, 11b and preferably consists of a soft component.

[0056] exist Figure 2 Shown in Figure 1 The second activated state of the valve is a state in which the first opening 3 is open and air can flow from the supply port 27 through the valve chamber 2 via the connection port 28 into the connection air cushion.

[0057] exist Figure 2 and all other figures, the same parts are provided with Figure 1 The same reference numerals are used throughout, wherein for reasons of clarity not all reference numerals are always shown.

[0058] Activation of the actuator 6 causes the operating element 13 to be lifted, and thus the plunger 7 is also pushed upwards by the elastic force of the elastic element 10. The first sealing element 11a is then no longer pushed onto the first opening 3, which is therefore opened.

[0059] Figures 3 to 5 Shown Figure 1 and Figure 2 Detailed view of the pneumatic valve diagram. Figure 3 and Figure 5 The states shown correspond to Figure 1 and Figure 2 status. Figure 4 The state is an intermediate state in the actuated state. However, in the intermediate state, the first opening 3 is not yet opened due to the adhesion of the first sealing element 11a because the elastic force of the elastic element 10 is insufficient to overcome the adhesion.

[0060] exist Figure 1 and Figure 3 In the inactive, held state, plunger 7 is pushed onto the lower nozzle seat of the first opening due to the restoring force of actuator 6, thereby sealing the first opening. The force of elastic element 10 in valve chamber 2 is significantly smaller than the restoring force of actuator 6. In this state, due to the clearance, driving element 20 has no contact with widened portion 8 of the plunger.

[0061] At the start of the opening process (see Figure 4 ), the first sealing element 11a may be prevented from opening by adhesion or by a positive pressure difference between the valve chamber 2 and the supply port 27. In this case, the operating section 14 of the actuator 6 is initially raised to a certain extent so that the entraining element 20 contacts the widened portion 8 of the plunger 7 from below and exerts an upwardly directed force on the plunger 7 in order to release the first sealing element 11a from the nozzle seat of the first opening 3.

[0062] Once the first sealing element 11a of the sealing plate 11 has been released from the lower nozzle seat ( Figure 5 ), the sealing plate is moved to its upper position by the elastic element 10 (e.g., a coil spring) and is held in this position by the elastic element 10 and, if appropriate, the pressure in the valve chamber 2. The valve is thus open, while the third opening 5 is sealed by the second sealing element 11b. The operating section 14 of the actuator 6 then moves further into its upper end position, so that, due to the clearance, the operating section and the entraining element 20 no longer contact the plunger 7 in either direction and therefore no longer exert any force on the plunger 7.

[0063] As already explained, the driving element 20 can be molded in one piece on the actuator component (for example, as a tab of an injection-molded part or a stamped and bent part) or can be installed separately as an additional component (for example, as a snap-on component), which can contact the piston 7 from below and the corresponding actuator component from above and is fastened to one of the two components in a non-detachable manner.

[0064] exist Figures 6 to 8 Each of the figures shows a detailed view of a second embodiment of the pneumatic valve according to the present invention. Here again, the same parts are provided with the same reference numerals. Figures 3 to 5 The same actuation state.

[0065] The illustrated configuration makes it possible to structurally limit the force applied by the actuator 6 to a maximum permissible value. This may be necessary if, due to environmental conditions or a fault, an excessive force is required to open the valve, or if opening does not occur within the specified actuation time of the SMA actuator 6. Both situations may lead to overloading of the SMA actuator 6 and thus to its premature failure.

[0066] The driver element 20 ′ is configured here as an elastic element in the form of a leaf spring, which yields when the tension is too great. Thus, if the plunger 7 is unable to release the first sealing element 11 a from the lower nozzle seat at the first opening 3 , the SMA actuator 6 can be moved further into its final position. Furthermore, this configuration makes it possible to dispense with an internal spring in the valve chamber 2 .

[0067] In the non-operating hold state ( Figure 6 ), the plunger pushes the first sealing element 11a onto the lower nozzle seat of the first opening 3 by the restoring force of the actuator 6 and thereby seals the first opening. In this process, the entire restoring force of the actuator 5 acts on the plunger 7 to apply a sealing force to the lower nozzle seat (i.e., the restoring force is not reduced by the reaction force of the internal spring).

[0068] Once the SMA actuator 6 is raised at the start of the opening process (see Figure 7 ), the driver element 20' exerts an upwardly directed force on the plunger 7, which increases as the stroke increases. This force is limited to a maximum permissible value by the elastic driver element 20'; this value occurs when the SMA actuator 6 reaches its final position but the plunger 7 is still firmly held in its rest position (for example, due to adhesion to the lower nozzle seat).

[0069] Once the plunger 7 has been released from the lower nozzle seat, the plunger is carried by the actuator 6 until it abuts against the third opening 5. At the same time, the push and pull forces exerted on the plunger 7 by the actuator 6 cancel each other out.

[0070] If the plunger 7 has reached its upper position, the valve is fully open (see Figure 8 ). The SMA actuator 6 can then be moved further to its own final position. In the process, the driving element 20' then again exerts a (limited) pulling force on the plunger 7, which is used to push the plunger onto the upper ventilation nozzle seat of the third opening 5. Therefore, the ventilation nozzle can be sealed even without an internal spring.

[0071] This tensile element of the SMA actuator 6 can likewise be formed integrally in one piece on a part of the actuator 6 (e.g. as a tab of an injection-molded or stamped bent part), and can also be mounted separately on the actuator 6 and / or the plunger 7 as an additional component (e.g. as a snap-fit), which (simultaneously) contacts the plunger from below and contacts the operating section of the actuator 6 from above and is secured to one of the two components in a captive manner.

[0072] In the third configuration, Figures 9 to 11 As shown, the elastic element 10 located inside is replaced by an elastic element 10' located outside the valve chamber 2. This elastic element abuts against the widened portion 8 of the plunger 7 from below and is supported on the upper cover of the valve chamber 2. When the valve is in the open state (see Figure 11 ), the elastic element 10 ′ holds the plunger 7 in its upper position.

[0073] In addition, a driver element 20" is formed on the outer elastic element 10' as a link, which, similar to the driver elements 20, 20' of the first and second embodiments, can provide an additional force for opening the valve. This is achieved by supporting the driver element 20" on the actuator 6 (see Figure 10 The driving element 20 ″ can also be formed elastically so as to limit the maximum force of the actuator 6 acting on the plunger 7.

[0074] When the valve is in the fully open state, neither the plunger 7 nor the driving element 20" is in contact with the actuator 6 (see Figure 11 ).

[0075] In the mentioned embodiment, even if the SMA actuator 6 is not located in the pressure chamber, the SMA actuator 6 can apply an increased force for separating the adhered first sealing element 11 a when needed.

[0076] In this case, the internal elastic element 10 in the valve chamber 2 can be configured to apply very little force, since it only has to move the plunger 7 to the upper final position and not to detach the adhered first sealing element 11a. This reduces the force that would normally have to be applied by the SMA actuator 6 and thus extends its service life.

[0077] In an alternative embodiment, the internal elastic element can be completely omitted, because when the valve is actuated, the actuator 6 exerts a corresponding force upward, which allows the plunger 7 to rest against the upper ventilation nozzle seat. The maximum force can be limited by the force / displacement characteristics of the actuator 6 or the driving element 20'. Thus, even in the event of a malfunction, the SMA actuator is protected from overloading.

[0078] In another embodiment, the outer elastic element 10 ′ replaces the inner elastic element 10 and is also part of the entrainment element 20 ″.

Claims

1. A pneumatic valve comprising a housing (1) in which a valve chamber (2) is arranged, the valve chamber having a first opening (3) for connection to a first housing gas port (27), a second opening (4) for connection to a second housing gas port (28), and a third opening (5) for connecting the valve chamber (2) to an actuator chamber (30), the actuator chamber being connected to the third housing gas port (29), in, An SMA actuator (6) having a movable closing element is arranged in a housing (1), wherein the closing element is formed by a plunger (7) which extends through the third opening (5) and has a sealing plate (11) formed at the end of the plunger extending into the valve chamber (2), and a first sealing element (11a) for closing the first opening (3) and a second sealing element (11b) for closing the third opening (5) are arranged on the sealing plate. wherein the elastic element (10, 10', 20') is operatively connected to the closing element, and when the pneumatic valve is in an activated state, the elastic element pushes the second sealing element (11b) toward the third opening (5), in, The plunger (7) and the actuator (6) have a positive connection with a gap via a driver element (20; 20'; 20"), so that actuating the actuator (6) causes the plunger (7) to move through the actuator (6) within the range of the gap.

2. The pneumatic valve according to claim 1, wherein: The actuator (6) further comprises: a printed circuit board (12) arranged in the actuator chamber (30), an operating element (13) which is arranged in the actuator chamber (30) and has an operating section (14) for acting on the plunger (7) and a bent section (15) connecting the operating section (14) to the printed circuit board (12), and an actuator element (16) arranged in the actuator chamber (30) and having a first end mechanically connected to the operating section (14) and a second end mechanically and electrically connected to the printed circuit board (12), The actuator element (16) is designed to cause the operating element (13) to enter a first state when it is in a non-energized state, in which the operating element pushes the plunger (7) onto the first opening (3), and the actuator element is designed to cause the operating element (13) to enter a second state when it is in a energized state, in which the operating section (14) does not exert any thrust on the plunger (7), and therefore, due to the action of the driving element (20; 20'; 20") and the elastic element (10; 10'), the second sealing element (11b) is pulled or pushed toward the third opening (5).

3. The pneumatic valve according to claim 1 or 2, characterized in that: The elastic element (10; 10') is formed by a coil spring in or outside the valve chamber (2), which is supported on the housing part (19) or the enclosure (2a) and pushes the plunger (7) from the second opening (3) to the third opening (5).

4. The pneumatic valve according to claim 1 or 2, characterized in that: The elastic element (20') is formed by a leaf spring which is formed on the operating section (14) of the actuator (6) and also serves as the entraining element (20').

5. The pneumatic valve according to any one of claims 1, 2 or 4, characterized in that: The entraining element (20') is fixedly connected to the operating section (14) of the actuator (6) and is movably connected to the plunger (7) in such a way that when the actuator (6) is actuated, the entraining element is entrained along with the operating section (14) and, after reaching the end of the gap, the plunger (7).

6. The pneumatic valve according to any one of claims 1 to 3, characterized in that: The driver element (20; 20') is fixedly connected to the operating section (14) of the actuator (6).

7. The pneumatic valve according to claim 3, wherein: The driver element (20") is fixedly connected to an elastic element (10') arranged outside the valve chamber (2).

8. The pneumatic valve according to claim 4, wherein: The driver element (20') has an elastic section, whereby a variable force is exerted on the plunger (7) when the actuator (6) is actuated.

Images