Solenoid valve

Abstract

Solenoid valve with a magnetic drive (12), a sealing element (42) and a single valve seat (22) associated with the sealing element (42), wherein the sealing element (42) is adjustable by means of the magnetic drive (12) between a closed position in which the sealing element (42) closes the valve seat (22) and an open position in which the sealing element (42) releases the valve seat (22), along a longitudinal axis (L) extending in the axial direction, wherein the magnetic drive (12) has a holder (38) with a receiving space (40) for the sealing element (42), which is designed such that the sealing element (42) is always mounted in the holder (38) without play in the axial direction, wherein the sealing element (42) axially bears against opposite end faces on the holder (38), which have a constant distance, wherein the holder (38) has a sealing opening (58) adjacent to the receiving space (40), via which the sealing element (42) rests against the valve seat (22) in the closed position, and wherein the solenoid valve (10) has an axial expansion chamber (46) which, opposite the sealing opening (58), directly adjoins the receiving space (40), and the receiving space (40) is at least partially larger in the radial direction than the sealing element (42) in order to form a free expansion volume (72) in the radial direction for the sealing element (42), so that the sealing element (42) can swell axially into the expansion chamber (46) and radially into the expansion volume (72), wherein the axial expansion chamber (46) has a diameter perpendicular to the longitudinal axis (L) which corresponds to at least 30% of the largest diameter of the sealing element (42) in the receiving space (40) perpendicular to the longitudinal axis (L) in the non-swollen state and / or at least 50% of the diameter of the sealing opening (58).

Description

The invention relates to a solenoid valve having a magnetic drive, a sealing element and a valve seat assigned to the sealing element. In this case, the sealing element can be adjusted along a longitudinal axis by means of the magnetic drive between a closed position, in which the sealing element closes the valve seat, and an open position, in which the sealing element releases the valve seat.Such solenoid valves are known from the prior art.The sealing elements normally used in these solenoid valves can swell upon contact with a swelling medium, for example water vapor, as a result of which the available stroke of the valve is reduced by the increased volume of the swollen sealing element. Particularly in the case of smaller valves with a stroke of less than one millimeter, such swelling of the sealing element due to the media contact can have such a strong effect that a flow reduction or functional faults of the solenoid valve occur.In order to compensate for such swelling of the sealing element, the solenoid valve is usually designed with an increased stroke. However, this has the disadvantage that a greater magnetic force must also be provided for actuating the valve.Solenoid valves are known from US 2011 / 0 308 621 A1 and from US 2007 / 0 164 243 A1.The object of the invention is to provide a solenoid valve which has a substantially constant stroke, independently of the medium which flows through the valve.To achieve the object, a solenoid valve with a magnetic drive, a sealing element and a single valve seat assigned to the sealing element is provided. The sealing element is displaceable by means of the magnetic drive between a closed position, in which the sealing element closes the valve seat, and an open position, in which the sealing element releases the valve seat, along a longitudinal axis, which extends in the axial direction. The magnetic drive has a holder with a receiving space for the sealing element, which is designed such that the sealing element is always mounted in the holder without play in the axial direction, i.e. even in the non-swollen state. The sealing element here bears axially against opposite end faces on the holder, which end faces have a constant spacing. The holder has a sealing opening adjoining the receiving space, via which the sealing element abuts the valve seat in the closed position. The solenoid valve further has an axial expansion chamber which directly adjoins the receiving space opposite the sealing opening. The receiving space is larger than the sealing element at least in sections in the radial direction in order to form a free expansion volume in the radial direction for the sealing element, so that the sealing element can swell axially into the expansion chamber and radially into the expansion volume. Furthermore, the axial expansion chamber, in particular adjacent to the receiving space, has a diameter perpendicular to the longitudinal axis which corresponds to at least 30% of the largest diameter of the sealing element in the receiving space perpendicular to the longitudinal axis in the non-swollen state. As a result, a particularly large proportion of the sealing element is exposed on its axial side facing away from the valve seat and can therefore expand into the axial expansion chamber when the sealing element swells. Additionally or alternatively, the axial expansion chamber can have a diameter perpendicular to the longitudinal axis which corresponds to at least 50% of the diameter of the sealing opening. In this way, when the sealing element swells, the axial side of the sealing element facing away from the valve seat is sufficiently relieved, so that the sealing element expands mainly away from the valve seat and thus the stroke is not significantly reduced due to the swelling of the sealing element.It has been recognized that an expansion of the sealing element upon swelling in the direction of the valve seat can be effectively reduced or even completely prevented by providing the sealing element with expansion spaces in the form of the axial expansion chamber and the radial expansion volume, into which the sealing element can expand in a defined manner upon swelling.Because only one valve seat is situated opposite the sealing element, the sealing element can expand axially opposite the valve seat without the stroke being significantly reduced.In this way, the solenoid valve has a constant stroke and thus constant fluid data both in applications with swelling media, i.e. media which let the sealing element swell upon contact, and in applications with non-swelling media.This effect can be ensured more reliably by the holder having an end wall which is opposite the valve seat and through which the sealing opening, which is designed as a channel, extends in the axial direction.In particular, the end wall can delimit the receiving space and the expansion volume in the axial direction in order to form a barrier in the direction of the valve seat, which barrier retains the sealing element and, when swelling up, directs the expansion of the sealing element away from the valve seat in the axial direction.In one embodiment, the sealing opening has a diameter perpendicular to the longitudinal axis which is smaller over the entire length of the channel than a maximum diameter perpendicular to the longitudinal axis of the sealing element which the sealing element has in the non-swollen state in an axial section of the receiving space. This can ensure that the sealing element does not expand substantially in the direction of the valve seat via the sealing opening when the sealing element swells.In a further embodiment, the channel widens conically in the direction of the valve seat, as a result of which the diameter perpendicular to the longitudinal axis and thus the volume of individual channel sections become larger in the direction of the valve seat. The stress within the sealing element is thus ever less at a smaller distance from the valve seat, even when swelling up.In this case, it can be provided that the sealing element has an extension which, in the non-swollen state, protrudes from the receiving space into the channel and the sealing element is at least partially spaced apart radially from the channel wall in the widened portion. This design has the advantage that the extension can expand radially in the channel when the sealing element swells. This has the consequence that the expansion of the extension in the axial direction is minimized.Furthermore, in the non-swollen state of the sealing element, the extension can have a constant diameter in the axial direction perpendicular to the longitudinal axis and be formed coaxially to the channel. In this way, the extension is designed such that it reliably closes the valve seat when it bears against the latter. Furthermore, the symmetrical structure ensures that the extension expands uniformly in all radial directions when swelling.According to one embodiment, the sealing element in the region of the channel in the non-swollen state bears radially against the channel wall in a planar and play-free manner, as a result of which the sealing element is always mounted in the holder without play in the radial direction, i.e. even in the non-swollen state.In particular, the sealing element in this case bears against the holder only in the region of the channel in the radial direction. This has the advantage that the remaining radial side surfaces of the sealing element are exposed and the sealing element can thus expand over the latter in the radial direction when the sealing element swells.According to a further embodiment, the sealing element, in particular in a radial edge section, abuts on two mutually opposite annular surfaces which overlap in axial view in the axial direction and extends between them. The ring surfaces are, so to speak, projected notionally onto one another in the axial direction and overlap in the process. In this way, the sealing member is reliably fixed in the axial direction because it is clamped in the axial direction without a slant component, thus ensuring that the sealing member expands into the axial expansion chamber without substantial restrictions when the sealing member swells.In particular, the annular surfaces can extend in each case in a plane which is perpendicular to the longitudinal axis, as a result of which the sealing element expands particularly advantageously when swelling up.It is furthermore advantageous if the holder is designed such that the sealing element is always mounted without play in the radial direction in the holder, i.e. even in the non-swollen state, in order to ensure that the sealing element always has a defined position and reliably closes the valve seat in the closed position of the solenoid valve.In one embodiment, the axial expansion chamber, in particular adjacent to the receiving space, has a diameter perpendicular to the longitudinal axis which corresponds to at least 50% of the largest diameter of the sealing element in the receiving space perpendicular to the longitudinal axis in the non-swollen state.Additionally or alternatively, the axial expansion chamber, in particular adjacent to the receiving space, can have a diameter perpendicular to the longitudinal axis which corresponds to at least 70% of the diameter of the sealing opening.Furthermore, it can be provided that the sealing opening has a smallest diameter perpendicular to the longitudinal axis, which corresponds to at least 50% of the largest diameter of the sealing element in the receiving space perpendicular to the longitudinal axis in the non-swollen state. This design ensures that the sealing element does not expand substantially in the direction of the valve seat via the sealing opening when the sealing element swells.In order to ensure a particularly homogeneous expansion away from the valve seat, the axial expansion chamber can be arranged coaxially with respect to the receiving space.In a further embodiment, the radial expansion volume and the receiving space have an axial height which corresponds to at least 50%, in particular at least 75%, of the axial height of the sealing element. This has the advantage that a particularly large proportion of the radial side surfaces of the sealing element are exposed and the sealing element can thus expand via the latter into the radial expansion volume when the sealing element swells.It is advantageous if the sealing element, the receiving space, the axial expansion chamber and / or the radial expansion volume are designed rotationally symmetrically with respect to the longitudinal axis. This rotationally symmetrical configuration promotes the sealing element to expand uniformly away from the valve seat when it swells.Furthermore, the volume of the axial expansion chamber and the radial expansion volume in total can be at least 10%, in particular at least 20%, of the volume of the sealing element in the non-swollen state. Thus, a sufficiently large volume is available in the axial expansion chamber and in the radial expansion volume in order to completely compensate for the volume increase of the sealing element in the swollen state. By allowing the sealing element to expand infinitely into these provided expansion spaces in this way, the sealing element is reliably prevented from expanding substantially in the direction of the valve seat.According to one embodiment, the holder is part of a closure part actuated by the magnetic drive or forms the closure part, as a result of which the solenoid valve can be designed to be particularly compact and cost-effective.In particular, the closure part can form a valve armature of the solenoid valve.It can further be provided that the closure part has an axial passage which extends from the axial expansion chamber as far as an opposite axial end of the closure part, in particular wherein the closure part has a transverse channel which extends in the radial direction from the axial passage through the closure part and opens into a valve chamber of the solenoid valve. This design ensures that the medium washes around the closure part and the sealing element during operation, as a result of which the solenoid valve operates reliably and can be designed in a particularly simple manner.According to a further embodiment, the solenoid valve has a connection diameter with a nominal width of 0.8 to 3 mm, in particular 1.2 to 2.7 mm and / or has a stroke of between 0.6 and 1.0 mm and is thus a particularly small and compact solenoid valve.Further advantages and features will become apparent from the following description and from the attached drawings. In these show:FIG. 1 shows a side view of a solenoid valve according to the invention with a solenoid drive and a sealing element, which are shown in a partial sectional view in a closed position of the solenoid valve,FIG. 2 is a side view of the solenoid valve from FIG. 1 in an open position, wherein the solenoid drive and the sealing element are shown in a partial sectional view, andFIG. 3 is a detailed view of the detail A from FIG. 1.In FIG. 1, a solenoid valve 10 is shown with a solenoid drive 12 and a fluid housing 14.The fluid housing 14 has a fluid inlet 16 and a fluid outlet 18, which open via channels into a valve chamber 20 of the solenoid valve 10 and are connected to one another in terms of flow via the latter, wherein the inlet and outlet can also be interchanged.The fluid inlet 16 ends with its channel at a valve seat 22 of the solenoid valve 10.The magnetic drive 12 has a coil 24, a core guide tube 26, a fixed magnetic plug 28 which is fixedly mounted in a core guide tube 26, and a closure part 30 which is arranged in the core guide tube 26 such that it can be displaced axially in the longitudinal direction L.In the embodiment shown, the closure part 30 is a valve armature of the magnetic drive 12.The closure part 30 has a circular cylindrical geometry in the core guide tube 26 and has an end face 34 at a first axial end 32, which end face is opposite the magnet plug 28 and serves as a contact surface.At an opposite second axial end 36 of the closure part 30, which is opposite the valve seat 22, a holder 38 with a receiving space 40 for a sealing element 42 of the solenoid valve 10 is arranged.The holder 38 is formed integrally with the closure part 30, i.e. is a one-piece component of the closure part 30.In an alternative embodiment, the holder 38 can be formed separately from the closure part 30 and fastened to the latter.The closure part 30 has an axial passage 44 which extends from the first axial end 32 in the longitudinal direction L through the closure part 30 and opens into the receiving space 40 via an axial expansion chamber 46.The axial passage 44 is connected in terms of flow to the valve chamber 20 via a radial transverse channel 48 of the closure part 30.The closure part 30 has at its second axial end 36 a radially outwardly projecting collar 50, on which a spring 52 of the solenoid valve 10 is supported.In an axially opposite manner, the spring 52 is supported on a section 54 of the core guide tube 26 and acts on the closure part 30 in the axial direction toward the valve seat 22.Optionally, the portion of the closure portion 30 along which the spring 52 extends may taper toward the second end 36, as shown in FIG. 1.In an alternative embodiment, the spring 52 may be disposed in the axial passage 44, which then forms a spring space for the spring 52.In FIG. 1, in which the solenoid valve 10 is shown in a closed position, the spring 52 presses the closure part 30 with the sealing element 42 in the axial direction onto the valve seat 22, so that the latter is closed and thus no medium can flow from the fluid inlet 16 via the valve seat 22 to the fluid outlet 18.In order to adjust the solenoid valve 10 into an open position (see FIG. 2 ), a magnetic force is generated by means of the coil 24, which magnetic force pulls the closure part 30 axially in the direction of the magnet plug 28 counter to the force of the spring 52 until the end face 34 bears against the magnet plug 28. As a result, the second axial end 36 of the closure part 30 with the sealing element 42 is removed from the valve seat 22 in the axial direction, so that the fluid inlet 16 is connected in terms of flow to the fluid outlet 18 via the valve seat 22 and the valve chamber 20.The solenoid valve 10 is designed to be in contact with the medium. This means that when the solenoid valve 10 is open, medium flows into the valve chamber 20 and flushes the closure part 30 as far as the magnet plug 28.Via the axial passage 44 and the transverse channel 48, all volumes into which medium can flow via the closure part 30 are always in communication with the valve chamber 20 in terms of flow, so that the medium can be displaced from these volumes at any time with low pressure and does not impair the function of the magnetic drive 12.The solenoid valve 10 is designed as a 2 / 2 directional valve with a single valve seat 22, to which the sealing element 42 is assigned.In particular, the solenoid valve 10 is a small, compact solenoid valve with a connection diameter with a nominal width of 0.8 to 3 mm, in particular 1.2 to 2.7 mm.In the present exemplary embodiment, the solenoid valve 10 has a stroke H of 0.6 mm between the valve seat 22 and the sealing element 42.The stroke H corresponds here to the distance M between the closure part 30 and the magnetic plug 28.In principle, the solenoid valve 10 can have an arbitrarily large stroke H. Preferably, however, the stroke H is between 0.6 and 1.0 mm and is thus comparatively small.In order to ensure that the stroke H does not change significantly even when the sealing element 42 swells upon contact with the medium and is subsequently in a swollen state with an increased volume, the solenoid valve 10 and in particular the holder 38 are designed, as will be explained below with reference to FIG. 3.In all the figures, the sealing element 42 is shown in its initial state, i.e. in the non-swollen state.The holder 38 encloses the receiving space 40, in which the sealing element 42 is received, and has an end wall 56 with a sealing opening 58 at the second axial end 36, as can be seen in FIG. 3.The sealing opening 58 is formed as an axial channel 60 through the end wall 56, which is axially opposite the valve seat 22 and opens into the receiving space 40.The channel 60 has, adjacent to the receiving space 40, a circular cylindrical section 62 and a conical section 64 adjoining it in the axial direction, in which the diameter of the channel 60 increases in the axial direction towards the valve seat 22.The receiving space 40 extends in the axial direction from the end wall 56 as far as the axial expansion chamber 46, to which the receiving space 40 directly adjoins or into which the receiving space 40 merges.The axial expansion chamber 46 has a radius r 1, which is smaller than the maximum radius r 2 of the sealing element 42 in the receiving space 40.The sealing element 42 further has an axial extension 66, which extends from the receiving space 40 through the channel 60 in the direction of the valve seat 22 and which has a contact surface 68, which in the closed position of the solenoid valve 10 bears against the valve seat 22 and tightly closes it.In the embodiment shown, the extension 66 extends in the axial direction up to the height of the second axial end 36 of the closure part 30 or of the holder 38.In principle, the extension 66 can extend as far as possible in the axial direction into the channel 60 or beyond the latter, wherein the stroke H corresponds to the axial distance between the contact surface 68 and the valve seat 22 in the open position of the solenoid valve 10 (see FIG. 2 ).The extension 66 is designed in the form of a circular cylinder with a radius r 3 which corresponds to the radius r 3 of the circular cylindrical section 62. Thus, the extension 66 in the circular cylindrical section 62 bears flat against the holder 38 in the radial direction without play, while a gap 70 is formed in the radial direction between the holder 38 and the extension 66 in the conical section 64.The radius r 3 of the circular cylindrical section 62 is smaller than the maximum radius r 2 of the sealing element 42 in the receiving space 40.The receiving space 40 has a radius r 4, which is greater than the maximum radius r 2 of the sealing element 42 in the receiving space 40, as a result of which the receiving space 40 has a free expansion volume 72, which surrounds the sealing element 42 in the receiving space 40 in the form of a hollow cylinder.The receiving space 40 or the expansion volume 72 has an axial height h 1, which is smaller than the total axial height h 2 of the sealing element 42.Due to this configuration, the sealing element 42 is mounted in the holder 38 without play radially exclusively via the extension 66, which can also be different in an alternative embodiment.In the axial direction, the sealing element 42 is mounted without play between a first annular surface 74, which encloses the sealing opening 58, and an opposite second annular surface 76, which encloses the opening to the axial expansion chamber 46.Here, the two annular surfaces 74, 76 extend in a plane which is perpendicular to the longitudinal axis L and are directly opposite one another in the axial direction.The corresponding contact surfaces with which the sealing element 42 abuts the two annular surfaces 74, 76 in its radial edge section 78 extend parallel to the annular surfaces 74, 76, whereby a particularly good bearing is ensured. Furthermore, this mounting, in particular on the first annular surface 74, promotes the manner in which the sealing element 42 expands upon swelling, as will be described later.The sealing element 42, the extension 66, the channel 60, the receiving space 40, the radial expansion volume 72, the axial expansion chamber 46 and the valve seat 22 are configured, inter alia, rotationally symmetrical and coaxially with respect to the longitudinal axis L.In the illustrated embodiment, the radius r 1 of the axial expansion chamber 46 is about 1.65 mm, the radius r 2 of the sealing member 42 is about 2.5 mm, and the radius r 3 of the sealing opening 58 is about 2.1 mm.The diameter of the axial expansion chamber 46 is thus about 66% of the maximum diameter of the sealing element 42 and about 79% of the minimum diameter of the sealing opening 58.Of course, in an alternative embodiment, the solenoid valve 10 may have substantially any dimensions. Preferably, however, the diameter of the axial expansion chamber 46 is at least 30%, in particular at least 50%, of the maximum diameter of the sealing element 42 and / or at least 50%, in particular at least 70%, of the minimum diameter of the sealing opening 58.Further, the minimum diameter of the seal opening 58 is about 84% of the maximum diameter of the seal member 42.In principle, the ratio of the minimum diameter of the sealing opening 58 to the maximum diameter of the sealing element 42 can be of any desired size. Preferably, however, the minimum diameter of the sealing opening 58 is at least 50% of the maximum diameter of the sealing element 42.In particular, in all cases the maximum diameter of the sealing element 42 is greater than the diameter of the axial expansion chamber 46 and the minimum diameter of the sealing opening 58, in order to ensure reliable axial mounting of the sealing element 42 even in the non-swollen state.Furthermore, in the embodiment shown, the axial height h 1 of the receiving space 40 or of the expansion volume 72 is approximately 2.5 mm and the height h 2 of the sealing element 42 is approximately 3.1 mm.The radius r 4 of the receiving space 40 or of the expansion volume is approximately 2.7 mm.The axial height h 1 of the receiving space 40 or of the expansion volume 72 is therefore approximately 81% of the axial height h 2 of the sealing element 42.Of course, in an alternative embodiment, the axial height h 1 of the receiving space 40 or of the expansion volume 72 can have any proportion of the axial height h 1 of the sealing element 42. Preferably, however, the axial height h 1 of the receiving space 40 or of the expansion volume 72 corresponds to at least 50%, in particular at least 75%, of the axial height h 1 of the sealing element 42.In particular, in all cases the axial height h 1 of the receiving space 40 or of the expansion volume 72 is less than or equal to the axial height h 1 of the sealing element 42 in order to ensure reliable radial mounting of the sealing element 42 even in the non-swollen state.Due to this configuration, the sealing element 42 is also mounted in the holder 38 in the non-swollen state and thus always without play, both radially and axially.In operation, when the sealing member 42 contacts a swelling medium, such as water vapor, and swells, the sealing member 42 expands radially into the expansion volume 72 and axially into the axial expansion chamber 46.The axial expansion chamber 46 and the expansion volume 72 are dimensioned such that their common volume amounts to approximately 15% of the volume of the sealing element 42 in the initial state.In principle, the volume of the axial expansion chamber 46 and the expansion volume 72 can each be of any desired size. Preferably, however, its common volume is at least 10%, in particular at least 20%, of the volume of the sealing element 42 in the non-swollen state.In this way, sufficiently large expansion spaces are provided in the form of the axial expansion chamber 46 and the expansion volume 72, into which the sealing element 42 can expand when it swells.The geometry of the holder 38 further facilitates that the sealing element 42 expands away from the valve seat 22 mainly in the radial direction as well as in the axial direction.In particular, the manner in which contact surfaces, on which the sealing element 42 is supported during swelling, and free surfaces, via which the swelling sealing element 42 expands into the expansion spaces, are arranged and are designed like these, ensure in this case that the sealing element 42 cannot expand substantially in the direction of the valve seat 22.Thus, the stroke H of the solenoid valve 10 remains constant even if the sealing member 42 should swell.

Claims

Solenoid valve having a magnetic drive (12), a sealing element (42) and a single valve seat (22) assigned to the sealing element (42), wherein the sealing element (42) is adjustable by means of the magnetic drive (12) between a closed position, in which the sealing element (42) closes the valve seat (22), and an open position, in which the sealing element (42) releases the valve seat (22), along a longitudinal axis (L) which extends in the axial direction, wherein the magnetic drive (12) has a holder (38) with a receiving space (40) for the sealing element (42), which is designed such that the sealing element (42) is mounted in the holder (38) always without play in the axial direction, wherein the sealing element (42) bears axially against opposite end faces on the holder (38), which have a constant spacing, wherein the holder (38) has a sealing opening (58) adjoining the receiving space (40), via which the sealing element (42) abuts the valve seat (22) in the closed position, and wherein the solenoid valve (10) has an axial expansion chamber (46), which directly adjoins the receiving space (40) opposite the sealing opening (58), and the receiving space (40) is at least partially larger in the radial direction than the sealing element (42) in order to form a free expansion volume (72) in the radial direction for the sealing element (42), such that the sealing element (42) can swell axially into the expansion chamber (46) and radially into the expansion volume (72), wherein the axial expansion chamber (46) has a diameter perpendicular to the longitudinal axis (L), which corresponds to at least 30% of the largest diameter of the sealing element (42) in the receiving space (40) perpendicular to the longitudinal axis (L) in the non-swollen state and / or to at least 50% of the diameter of the sealing opening (58).Solenoid valve according to Claim 1, characterized in that the holder (38) has an end wall (56) which is situated opposite the valve seat (22) and through which the sealing opening (58), which is designed as a channel (60), extends in the axial direction, in particular wherein the end wall (56) delimits the receiving space (40) and the expansion volume (72) in the axial direction.Solenoid valve according to Claim 2, characterized in that the duct (60) widens conically in the direction of the valve seat (22).Solenoid valve according to Claim 3, characterized in that the sealing element (42) has an extension (66) which, in the non-swollen state, projects from the receiving space (40) into the duct (60), and the sealing element (42) is at least in sections spaced apart radially from the duct wall in the widened section (64), in particular in the end region of the sealing opening (58) which is close to the valve seat (22).Solenoid valve according to Claim 4, characterized in that, in the non-swollen state of the sealing element (42), the extension (66) has a constant diameter in the axial direction perpendicular to the longitudinal axis and is formed coaxially with the duct (60).Solenoid valve according to Claim 4 or 5, characterized in that, in the non-swollen state, the sealing element (42) bears radially against the duct wall in a planar and play-free manner in the region of the duct (60), bears in particular bears against the holder (38) only in the region of the duct (60).Solenoid valve according to one of the preceding claims, characterized in that the sealing element (42), in particular in a radial edge section (78), bears in the axial direction against two mutually opposite annular surfaces (74, 76) which overlap in axial view and extend between them, in particular wherein the annular surfaces (74, 76) each extend in a plane which is perpendicular to the longitudinal axis (L).Solenoid valve according to one of the preceding claims, characterized in that the holder (38) is designed in such a way that the sealing element (42) is always mounted in the holder (38) without play in the radial direction.Solenoid valve according to one of the preceding claims, characterized in that the axial expansion chamber (46) has a diameter perpendicular to the longitudinal axis (L) which corresponds to at least 50% of the largest diameter of the sealing element (42) in the receiving space (40) perpendicular to the longitudinal axis (L) in the non-swollen state and / or which corresponds to at least 70% of the diameter of the sealing opening (58).Solenoid valve according to one of the preceding claims, characterized in that the sealing opening (58) has a smallest diameter perpendicular to the longitudinal axis (L) which corresponds to at least 50% of the largest diameter of the sealing element (42) in the receiving space (40) perpendicular to the longitudinal axis (L) in the non-swollen state.Solenoid valve according to one of the preceding claims, characterized in that the axial expansion chamber (46) is arranged coaxially with respect to the receiving space (40).Solenoid valve according to one of the preceding claims, characterized in that the radial expansion volume (72) and the receiving space (40) have an axial height (h 1) which corresponds to at least 50%, in particular at least 75%, of the axial height (h 2) of the sealing element (42).Solenoid valve according to one of the preceding claims, characterized in that the sealing element (42), the receiving space (40), the axial expansion chamber (46) and / or the radial expansion volume (72) are designed rotationally symmetrically with respect to the longitudinal axis (L).Solenoid valve according to one of the preceding claims, characterized in that the volume of the axial expansion chamber (46) and the radial expansion volume (72) in total amounts to at least 10%, in particular at least 20%, of the volume of the sealing element (42) in the non-swollen state.Solenoid valve according to one of the preceding claims, characterized in that the holder (38) is part of a closure part (30) actuated by the magnetic drive (12) or forms the closure part (30), in particular wherein the closure part (30) forms a valve armature of the solenoid valve (10).Solenoid valve according to Claim 15, characterized in that the closure part (30) has an axial passage (44) which extends from the axial expansion chamber (46) to an opposite axial end (32) of the closure part (30), in particular wherein the closure part (30) has a transverse duct (48) which extends in the radial direction from the axial passage (44) through the closure part (30) and opens into a valve chamber (20) of the solenoid valve (10).Solenoid valve according to one of the preceding claims, characterized in that the solenoid valve (10) has a connection diameter with a nominal width of 0.8 to 3 mm, in particular 1.2 to 2.7 mm, and / or has a stroke (H) of between 0.6 and 1.0 mm.

Images