Solenoid valve

Abstract

solenoid valve (10), in particular a media-separated solenoid valve, with a valve actuator (16) comprising an electromagnet (18), an actuator (28) which is movably mounted between an open position and a closed position by means of the valve drive (16), a fluid housing (12) with a valve seat (20), wherein a fluid channel (22) runs in the fluid housing (12) from a first fluid port (24) to the valve seat (20) and from the valve seat (20) to a second fluid port (26), a diaphragm (30) that interacts with the valve seat (20), wherein the actuator (28) is coupled to the diaphragm (30) so that in the closing position the actuator (28) presses the diaphragm (30) onto the valve seat (20) and in the opening position lifts the diaphragm (30) away from the valve seat (20), a support ring (34) which is movably mounted in the direction of movement of the actuator (28), surrounds the actuator (28) and rests against the membrane (30), wherein a drive geometry (48) is provided between the support ring (34) and the actuator (28), which is designed such that when the actuator (28) moves from the closed position to the open position, there is a free stroke between the actuator (28) and the support ring (34), such that when the actuator (28) is initially moved from the closed position, no movement of the support ring (34) is caused and after bridging the free stroke, the support ring (34) is moved by the drive geometry (48) together with the actuator (28) in the direction of the open position of the actuator (28).

Description

[0001] The invention relates to a solenoid valve comprising a diaphragm that interacts with a valve seat, wherein an actuator movably mounted between an open position and a closed position is coupled to the diaphragm and the actuator presses the diaphragm onto the valve seat in the closed position and lifts the diaphragm off the valve seat in the open position.

[0002] In particular, the solenoid valve is a media-separated valve, meaning that the valve actuator is isolated from the medium controlled by the valve.

[0003] For this purpose, the diaphragm present in the valve is usually designed as a separating diaphragm, meaning that the diaphragm not only seals the valve seat but also serves to seal the valve actuator.

[0004] A disadvantage of such valves is that the diaphragm's wetted surface area can be relatively large. Depending on the fluid pressure at the valve inlet, a correspondingly high force is transmitted to the actuator via this wetted surface, against which the actuator must work. Consequently, a sufficiently powerful electromagnet is necessary in the valve actuator to switch the valve. Otherwise, leakage can occur at the valve seat. However, the larger the electromagnet, the greater the required installation space and the higher its energy consumption.

[0005] US 2017 / 0017243A1 describes a solenoid valve and a method for controlling the solenoid valve.

[0006] CN 1 12 228 588 B discloses an electromagnetic valve with a diaphragm for shutting off a valve channel.

[0007] It is therefore an object of the invention to provide a solenoid valve that has a compact design and at the same time ensures a tight closure of the valve.

[0008] This problem is solved according to the invention by a solenoid valve, in particular a media-separated solenoid valve, with a valve actuator comprising an electromagnet, an actuating element movably mounted by means of the valve actuator between an open position and a closed position, a fluid housing with a valve seat, wherein a fluid channel runs in the fluid housing from a first fluid port to the valve seat and from the valve seat to a second fluid port, a diaphragm that interacts with the valve seat, wherein the actuating element is coupled to the diaphragm, so that in the closed position the actuating element presses the diaphragm onto the valve seat and in the open position lifts the diaphragm from the valve seat, and a support ring movably mounted in the direction of movement of the actuating element, which surrounds the actuating element and bears against the diaphragm.Between the support ring and the actuator, a drive geometry is provided which is designed such that when the actuator moves from the closed position to the open position, there is a free stroke between the actuator and the support ring, such that when the actuator initially moves from the closed position, no movement of the support ring is caused and after bridging the free stroke, the support ring is moved by the drive geometry together with the actuator in the direction of the open position of the actuator.

[0009] In addition to the actuator, the support ring exerts a closing force on the diaphragm, ensuring the solenoid valve remains reliably closed even under increased fluid pressure. Specifically, the support ring provides an annular surface that offers additional support for the diaphragm. This reduces the force the actuator must exert on the diaphragm when the solenoid valve is closed.

[0010] The support ring also prevents the membrane from stretching, thus extending its service life by reducing material fatigue.

[0011] Because there is a free stroke between the actuator and the support ring, the support ring is only lifted from the valve seat when the actuator has already moved a certain distance closer to the electromagnet, thus exerting a greater magnetic force on the actuator. This allows the mechanical work of the electromagnet to be utilized more efficiently. In particular, less magnetic power is required; that is, compared to a valve without a support ring, a smaller solenoid coil can be used for the same nominal valve size, which in turn is advantageous with regard to the required installation space. The current consumption of the electromagnet is also reduced as a result.

[0012] The additional support of the diaphragm makes it possible to operate the solenoid valve in both over-clamp and under-clamp flow modes.

[0013] Due to the idle stroke, the support ring has a particularly reduced stroke compared to the actuator.

[0014] The actuator and the support ring are each, for example, subjected to a spring force towards the valve seat. The springs provide the necessary closing force to close the solenoid valve against the fluid pressure and to keep it closed when the solenoid valve is de-energized.

[0015] When the solenoid valve is open, the pressurized diaphragm area is relatively large, so the fluid pressure exerts a relatively high force on the diaphragm. Because two parallel springs act on the actuator and the support ring, the closing force is large enough to press the diaphragm against the valve seat, counteracting the fluid pressure.

[0016] The two springs can be joined together in one piece, in particular where, viewed in a cross-sectional view, the two springs form an M-shape, with the V-shaped inner section of the spring pressing against the actuator and the cylindrical outer section against the support ring. This means that, due to the M-shaped design of the springs, they can act on radially spaced surfaces despite being joined in one piece. By forming the two springs as one piece, handling them during assembly is considerably simplified.

[0017] According to one embodiment, the actuator has an intermediate section that tapers conically towards the valve seat, in which the spring acting on the actuator is located. This contributes to a compact design of the valve, particularly with regard to the space required in the radial direction.

[0018] For example, an anchor sleeve is provided that also extends laterally to the actuator. The anchor sleeve can have a radial flange at its end near the valve seat, on which the spring acting on the actuator and the spring acting on the support ring are supported, thus providing a continuous support surface for the springs in a simple manner.

[0019] The solenoid valve can comprise a valve body that can be attached to the fluid housing, wherein the valve body has a receiving space in which the support ring is arranged.

[0020] To ensure that the support ring does not exert excessive force on the diaphragm, a stop is preferably provided in the valve housing to limit the movement of the support ring towards the valve seat. This has a positive effect on the service life of the diaphragm.

[0021] The support ring is guided axially within the valve housing, for example. This axial guidance simultaneously positions the support ring radially, ensuring that the diaphragm is automatically supported in the correct position.

[0022] The receiving chamber may contain a radially inward projection extending from the valve housing, which rests against the diaphragm. This projection can serve to support the diaphragm and simultaneously act as a stop for the support ring. This also contributes to a compact design.

[0023] According to one embodiment, the drive geometry is formed by a collar projecting radially inwards on the support ring, which is arranged to overlap radially with a collar projecting radially outwards from the actuator. In the closed state of the solenoid valve, an axial gap exists between the two collars, in particular to create the idle stroke.

[0024] Specifically, the drive geometry can be formed by a collar projecting radially inwards on the support ring or a collar projecting outwards on the actuator, which projects into a groove on the actuator or on the support ring and sits in the groove with an axial play, the play defining the free stroke.

[0025] In both cases, the carrying geometry is implemented in a mechanically simple way.

[0026] The wetted surface of the membrane is preferably flat. This results in a low membrane height and ease of cleaning. Furthermore, the fluid-filled volume within the fluid housing is reduced.

[0027] To couple the membrane to the actuator, a coupling geometry can be present on the membrane and a receptacle can be formed in the actuator in which the coupling geometry is positively engaged.

[0028] Alternatively, a coupling geometry can be formed on the actuator, wherein a receptacle is provided on the membrane in which the coupling geometry is positively engaged.

[0029] The two aforementioned alternatives allow for easy coupling of the diaphragm with the actuator and also easy replacement if the diaphragm needs to be replaced due to wear.

[0030] The alternative, in which the receptacle is formed in the actuator, also allows for a particularly compact design in the radial direction.

[0031] Further advantages and features of the invention will become apparent from the following description and from the accompanying drawings, to which reference is made. The drawings show: - Fig. 1 a solenoid valve according to the invention in a sectional view, - Fig. 2. Turn off the solenoid valve Fig. 1 in an exploded view, - Fig. 3 a sectional view of the solenoid valve Fig. 1 in the area of ​​the valve seat when the solenoid valve is closed, - Fig. 4 a sectional view of the solenoid valve from Fig. 1 in the area of ​​the valve seat when the solenoid valve is in a half-open state, - Fig. 5 a sectional view of the solenoid valve from Fig. 1 in the area of ​​the valve seat in the fully open state of the solenoid valve, - Fig. 6 a sub-assembly of an alternative embodiment according to the invention, - Fig. 7 a sectional view of a solenoid valve according to a further embodiment of the invention, and - Fig. 8 a sectional view of the solenoid valve from Fig. 6 in the area of ​​the valve seat when the solenoid valve is closed.

[0032] Fig. Figure 1 shows a sectional view of a solenoid valve 10. The solenoid valve 10 is a diaphragm valve, specifically a piston valve.

[0033] For example, the solenoid valve 10 is used in hydrogen applications, but it is not limited to these.

[0034] The solenoid valve 10 comprises a fluid housing 12, a valve housing 14 and a valve actuator 16, which includes an electromagnet 18.

[0035] The fluid housing 12 is attached to the valve housing 14, on which the valve actuator 16 is mounted.

[0036] Additionally, a flange 17 is provided, which closes off the valve housing 14 at the top.

[0037] A valve seat 20 is formed in the fluid housing 12. A fluid channel 22 runs in the fluid housing 12 from a first fluid port 24 to the valve seat 20 and from the valve seat 20 to a second fluid port 26. Alternatively, a third fluid port 27 can also extend from or lead to the valve seat 20.

[0038] The solenoid valve 10 further comprises a movable, plunger-like actuator 28, which can be moved between an open position and a closed position by means of the valve drive 16.

[0039] A diaphragm 30 interacts with the valve seat 20, the media-contacting surface of which is flat in the exemplary embodiment.

[0040] The membrane 30, for example, is made of an elastomer material, in particular perfluorocarbon rubber (FFKM) or ethylene propylene diene monomer rubber (EPDM).

[0041] The diaphragm 30 is clamped between the fluid housing 12 and the valve housing 14. The diaphragm 30 therefore also serves to seal the valve actuator 16 against the fluid housing 12.

[0042] Optionally, the diaphragm 30 can have a bead on its edge that penetrates grooves in the fluid housing 12 and in the valve housing 14 and is also clamped therein.

[0043] The actuator 28 is positively coupled to the diaphragm 30, for example, so that in the closing position the actuator 28 presses the diaphragm 30 onto the valve seat 20 and in the opening position lifts the diaphragm 30 from the valve seat 20.

[0044] In the exemplary embodiment, the coupling of the membrane 30 with the actuator 28 is realized by having, for example, a mushroom-shaped coupling geometry 29 on the actuator 28 and a complementary receptacle 31 on the membrane 30 in which the coupling geometry 29 is positively engaged.

[0045] The valve housing 14 contains a receiving chamber 32 in which a sleeve-shaped support ring 34 as well as a first spring 36 and a second spring 38 are housed.

[0046] The support ring 34 is movably mounted in the direction of movement of the actuator 28, wherein the support ring 34 is axially guided on its outer circumference in the valve housing 14.

[0047] To limit the movement of the support ring 34 towards the valve seat 20, a stop 39 is provided in the valve housing 14, which is formed by a step in the valve housing 14.

[0048] The step forms a radially inward projection 41 from the valve housing 14, which rests against and supports the diaphragm 30.

[0049] The support ring 34 and the actuator 28 are each subjected to force towards the valve seat by means of one of the two springs 36, 38, so that the support ring 34 and the actuator 28 are moved into a closed position or held in this position when the solenoid valve 10 is de-energized.

[0050] The springs 36, 38 are arranged concentrically to each other and overlapping in the axial direction.

[0051] To enable a compact design, the actuator 28 has an intermediate section 40 that tapers conically towards the valve seat 20, in which the spring 38 acting on the actuator 28 is located.

[0052] Both springs 36, 38 are supported by an anchor sleeve 42, which also extends laterally to the actuator 28 and has a radial flange 43 formed by forming at its end near the valve seat 20. Specifically, the springs 36, 38 are supported by the radial flange.

[0053] The radial flange 43 of the anchor sleeve 42 is in turn supported on the flange 17.

[0054] The actuator 28 also has a projection 44 on which the spring 38 rests with its opposite end.

[0055] The spring 36 associated with the support ring 34 rests against an end face of the support ring 34.

[0056] To ensure precise positioning of the spring 36, a collar 46 is provided on the support ring 34, projecting axially from the end face towards the valve drive 16, which forms a lateral guide for the spring 36.

[0057] The sectional view shows that the springs 36 and 38, when viewed together, have an M-shape. Specifically, spring 36, which acts on the support ring 34, is cylindrical, while spring 38, which acts on the actuator 28, is V-shaped.

[0058] The actuator 28 protrudes from the valve drive 16 into the receiving chamber 32 and is coupled to the diaphragm 30 in the receiving chamber 32, as mentioned.

[0059] Furthermore, the actuator 28 is coupled to the support ring 34.

[0060] More precisely, a drive geometry 48 is provided between the support ring 34 and the actuator 28. The drive geometry 48 is designed such that when the actuator 28 moves from the closed position to the open position, there is a free stroke between the actuator 28 and the support ring 34. Consequently, when the actuator 28 initially moves out of the closed position, the support ring 34 does not move. After bridging this free stroke, the drive geometry 48 moves the support ring 34, together with the actuator 28, towards the open position of the actuator 28.

[0061] The idle stroke is, for example, between 0.2 and 0.5 mm, in particular 0.4 mm.

[0062] In the exemplary embodiment, the drive geometry 48 is formed by a collar 50 projecting radially inwards on the support ring 34, which is arranged in a radially overlapping direction with a collar 52 projecting radially outwards from the actuating element 28, so that the support ring 34 and the actuating element 28 are coupled in the axial direction.

[0063] In an alternative embodiment, which is not shown for the sake of simplicity, a transverse pin is inserted in the actuator 28 instead of the collar 50, which carries the support ring 34 along with it.

[0064] In the closed state of the solenoid valve 10, there is in particular an axial distance between the two collars 50, 52 which corresponds to the idle stroke.

[0065] A groove is formed between the projection 44 and the collar 52 on the actuator 28, into which the collar 50 projects, with axial play of the collar 50 in the groove to create the free stroke. Conversely, the groove can also be located in the support ring 34, and the collar projecting into the groove can be located in the actuator 28. Assembly can be achieved either by the elasticity of, for example, a plastic support ring 34, or by attaching a ring forming the collar 52 or the projection 44, or by a bayonet fitting or similar mechanism.

[0066] The support ring 34 is therefore moved in the same axis as the actuator 28, which makes the design of the solenoid valve 10 particularly simple in terms of complexity and number of components. All forces and movements act in one axis; no mechanical deflections, axes of rotation, or other complex couplings are necessary. In particular, all movements occur in the direction of action of the electromagnet 18, which corresponds to the direction of movement of the actuator 28.

[0067] The support ring 34 rests against the diaphragm 30 when the solenoid valve 10 is closed. Specifically, the support ring 34 is in contact with the diaphragm 30 along an annular contact surface 53.

[0068] The annular contact surface 53 is radially spaced from the actuator 28 around its circumference. Specifically, the annular contact surface 53 lies between the central region of the diaphragm 30, to which the actuator is coupled, and the rigidly clamped region of the diaphragm 30.

[0069] Fig. Figure 2 additionally shows the solenoid valve 10 in an exploded view.

[0070] Based on the Fig. Sections 3 to 5 below describe the opening process of the solenoid valve 10.

[0071] In Fig. Figure 3 shows the solenoid valve 10 in a closed state. Specifically, the solenoid valve 10 is closed when de-energized.

[0072] In this state, the actuator 28 presses the diaphragm 30 against the valve seat 20, and the support ring 34 rests against the diaphragm 30, providing additional support. The support ring 34 assists the actuator 28 in keeping the solenoid valve 10 closed against the fluid pressure applied at the fluid inlet. Specifically, the support ring 34 reduces the force exerted by the fluid on the actuator 28 by increasing the diaphragm area subjected to the force from above and thus the overall closing force.

[0073] The fluid inlet can be formed either through the fluid port 24 or through the fluid port 26 / 27, that is, the solenoid valve 10 can be over-clamp flowed or under-clamp flowed.

[0074] In both cases, the solenoid valve 10 is kept closed by the actuator 28 and the support ring 34, or by the combination of spring forces acting on the actuator 28 and the support ring 34.

[0075] A higher fluid pressure can be switched in an under-clamp solenoid valve 10 than in an over-clamp solenoid valve 10. For example, with the pressure in the Fig. Figures 1 to 5 illustrate that solenoid valve 10 can be switched with an overseat flow at a fluid pressure of 2 bar, while with an underseat flow at a fluid pressure of 5 bar. However, these values ​​are only examples and also depend, among other things, on the nominal diameter of the valve seat 20.

[0076] For example, the nominal diameter is that specified in the Fig. 1 to 5 illustrate solenoid valves between 3 mm and 5 mm.

[0077] In both cases, the additional support provided by the support ring 34 makes it possible to switch a higher fluid pressure than would be possible without the support ring 34. In particular, the support ring 34 increases the possible fluid pressure at the fluid inlet by 50%. This is also referred to as back pressure tightness.

[0078] At the same time, the support ring 34 improves the pressure stability of the relatively thin and large-area membrane 30 by preventing uncontrolled expansion of the membrane 30. This also extends the service life of the membrane 30.

[0079] During the opening process of the solenoid valve 10, the actuator 28 is first moved out of its closed position by energizing the electromagnet 18, as shown in Fig. 4 is illustrated.

[0080] Due to the free stroke between the actuator 28 and the support ring 34, the support ring 34 initially remains in its starting position and continues to be in contact with the diaphragm 30.

[0081] The valve actuator 16, in particular the electromagnet 18, must therefore initially only provide the force to move the actuator 28.

[0082] In the Fig. In position 4 shown, the actuator 28 has been raised by an amount that exactly corresponds to the idle stroke.

[0083] In this process, the air gap between the actuator 28 and the electromagnet 18 has decreased, resulting in a higher force acting on the actuator in this position than in the closed position of the actuator 28.

[0084] Due to the increased force on the actuator 28, after bridging the idle stroke, it is possible to also move the support ring 34 from its initial position, so that the solenoid valve 10 is fully opened, as described in Fig. 5 is illustrated.

[0085] This two-stage opening process allows for better utilization of the magnetic power of the electromagnet 18, resulting in energy savings. In other words, it is possible to use a less powerful electromagnet 18 than would be the case if the support ring 34 had to be moved simultaneously with the actuator 28 without any idle stroke, which is advantageous with regard to the manufacturing costs of the solenoid valve 10.

[0086] The electromagnet 18 could not provide a sufficiently large magnetic force to move the support ring 34 out of the closed position together with the actuator 28 from the outset; a more powerful electromagnet 18 would be required for this.

[0087] However, the effect that the magnetic force acting on the actuator 28 increases with increasing proximity to the electromagnet 18 is used here.

[0088] To close the solenoid valve 10, the actuator 28 and the support ring 34 are moved back into the closed position by the spring force of the two springs 36, 38.

[0089] When the solenoid valve 10 closes, the support ring 34 thus exerts an additional closing force on the diaphragm 30 and consequently enables the solenoid valve 10 to close against a higher fluid pressure than would be the case without the support ring 34.

[0090] Fig. Figure 6 illustrates an alternative embodiment of a solenoid valve 10.

[0091] The essential difference of the in Fig. 6 illustrated embodiment compared to the one in the Fig. The embodiment illustrated in Figures 1 to 5 consists in the fact that the two springs 36, 38 are integrally connected. In particular, the springs 36, 38 are part of a one-piece double spring. However, the basic shape of the double spring corresponds to that shown in Figure 1 to 5. Fig. 1. The shape of the two individual springs shown.

[0092] The use of a one-piece double spring simplifies the assembly of the solenoid valve 10, since the assembly of the individual springs 36, 38 is challenging, especially for small nominal diameters of the solenoid valve 10.

[0093] In the Fig. 7 and Fig. Figure 8 illustrates another embodiment of the solenoid valve 10.

[0094] A difference between the in the Fig. 7 and Fig. 8 illustrated embodiment and the one in the Fig. The difference in the embodiment of the solenoid valve 10 illustrated in Figures 1 to 5 lies in the manner of coupling the actuator 28 with the diaphragm 30, as can be seen particularly well in the detailed view in Figures 1 to 5. Fig. 7 can be seen.

[0095] During the Fig. 6 and Fig. In the embodiment shown in Figure 7, a coupling geometry 54 is provided on the membrane 30, and a receptacle 56 is formed in the actuator 28 in which the coupling geometry 54 is positively engaged. For this purpose, the receptacle 56 has radially inwardly projecting projections 58 which engage in a recess 60 on the coupling geometry 54.

[0096] The coupling geometry 54 on the membrane 30 has, in particular, the shape of a mushroom.

[0097] The fastening mechanism between the actuator 28 and the diaphragm 30 is different compared to the embodiment according to the Fig. 1 to 15 are essentially the reverse.

[0098] The in the Fig. 6 and Fig. However, the embodiment shown in Figure 7 is advantageous with regard to the radial dimensions. In other words, the actuator 28 and the coupling geometry 54 can be made narrower in the radial direction than in the reversed arrangement. This also allows the section of the support ring 34 that rests against the diaphragm 30 to be positioned closer to the actuator 28. In this way, the fluid pressure against which the solenoid valve 10 can be switched can be increased even further. For example, the solenoid valve 10 can be switched against a fluid pressure of up to 10 bar. Furthermore, this design is suitable for valves with small nominal diameters, for example, a nominal diameter between 1 mm and 3 mm.

[0099] Another difference from the one in the Fig.The embodiment of the solenoid valve 10 shown in Figures 1 to 5 consists in the fact that the radially inwardly projecting projection 41 is extended. This is also due to the fact that the section of the support ring 34 in contact with the diaphragm 30 is arranged closer to the actuator 28. The extension of the projection 41 restricts the movement of the diaphragm 30, and in particular, further prevents the diaphragm 30 from stretching.

[0100] Furthermore, the support ring 34 is angled inwards at its end near the valve seat 20 by means of the projection 41, so that a radially thinner-walled sleeve extension runs radially inside the projection 41 towards the diaphragm 30 and presses against it.

[0101] It is advantageous if the support ring 34 is located in the area of ​​the opening of the fluid connection 26 and, if present, 27, in order to support the membrane 30 in this area.

Claims

[1] Solenoid valve (10), in particular a media-separated solenoid valve, with a valve actuator (16) comprising an electromagnet (18), an actuator (28) which is movably mounted between an open position and a closed position by means of the valve drive (16), a fluid housing (12) with a valve seat (20), wherein a fluid channel (22) runs in the fluid housing (12) from a first fluid port (24) to the valve seat (20) and from the valve seat (20) to a second fluid port (26), a diaphragm (30) that interacts with the valve seat (20), wherein the actuator (28) is coupled to the diaphragm (30) so that in the closing position the actuator (28) presses the diaphragm (30) onto the valve seat (20) and in the opening position lifts the diaphragm (30) away from the valve seat (20), a support ring (34) which is movably mounted in the direction of movement of the actuator (28), surrounds the actuator (28) and rests against the membrane (30), wherein a drive geometry (48) is provided between the support ring (34) and the actuator (28), which is designed such that when the actuator (28) moves from the closed position to the open position, there is a free stroke between the actuator (28) and the support ring (34), such that when the actuator (28) is initially moved from the closed position, no movement of the support ring (34) is caused and after bridging the free stroke, the support ring (34) is moved by the drive geometry (48) together with the actuator (28) in the direction of the open position of the actuator (28). [2] Solenoid valve (10) according to claim 1, characterized by, that the actuator (28) and the support ring (34) are each subjected to a spring force towards the valve seat (20) by means of a spring (36, 38). [3] Solenoid valve (10) according to claim 2, characterized by , that the two springs (36, 38) are connected in one piece, in particular wherein the two springs (36, 38) are viewed in a sectional view in an M-shape, wherein the V-shaped inner section of the spring presses against the actuating element (28) and the cylindrical outer section presses against the support ring (34). [4] Solenoid valve (10) according to claim 2 or 3, characterized by , that the actuator (28) has an intermediate section (40) that tapers conically towards the valve seat (20), in which the spring (38) acting on the actuator (28) is located. [5] Solenoid valve (10) according to one of claims 2 to 4, characterized by, that an anchor sleeve (42) is provided which also extends laterally to the actuator (28), wherein the anchor sleeve (42) has a radial flange (43) at its end near the valve seat (20) on which the spring (38) acting on the actuator (28) and the spring (36) acting on the support ring (34) are supported. [6] Solenoid valve (10) according to any one of the preceding claims, characterized by , that the solenoid valve (10) comprises a valve housing (14) that can be attached to the fluid housing (12), wherein the valve housing (14) has a receiving chamber (32) in which the support ring (34) is arranged, and wherein a stop (39) is provided in the valve housing (14) that limits movement of the support ring (34) towards the valve seat (20). [7] Solenoid valve (10) according to claim 6, characterized by , that the support ring (34) is axially guided in the valve housing (14). [8] Solenoid valve (10) according to claim 6 or 7, characterized by, that in the receiving chamber (32) there is a projection (41) extending radially inwards from the valve housing (14) which rests against the diaphragm (30). [9] Solenoid valve (10) according to any one of the preceding claims, characterized by , that the drive geometry (48) is formed by a collar (50) projecting radially inwards on the support ring (34), which is arranged in a radially overlapping direction with a collar (52) projecting radially outwards from the actuating element (28). [10] Solenoid valve (10) according to any of the preceding claims, characterized by , that the drive geometry (48) is formed by a collar (50) projecting radially inwards on the support ring (34) or a collar (52) projecting outwards on the actuator (28), which projects into a groove on the actuator (28) or on the support ring (34) and sits with axial play in the groove. [11] Solenoid valve (10) according to any of the preceding claims, characterized by, that the media-contacting surface of the membrane (30) is flat. [12] Solenoid valve (10) according to any of the preceding claims, characterized by , that a coupling geometry (54) is present on the membrane (30) and wherein a receptacle (56) is formed in the actuator (28) in which the coupling geometry (54) is positively engaged. [13] Solenoid valve according to any one of claims 1 to 11, characterized by , that a coupling geometry (29) is present on the actuator (28), wherein a receptacle (31) is present on the membrane (30) in which the coupling geometry (29) is positively received.

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