Gas metering valve comprising damper plate

Abstract

The invention relates to a gas metering valve (1), wherein in particular the wear of the gas metering valve (1) and the vibrations of the gas metering valve (1) resulting from operation are minimised, a damper plate (7) made of plastics material being also arranged in the valve housing (2), a clamping element (8) being provided for the damper plate (7), connecting the damper plate (7) to the valve seat (3) and clamping them against one another, and the clamping element (8) comprising a clamping disc (11), the clamping disc (11) abutting a side of the damper plate (7) facing away from the stop surface (AF), and the clamping disc (11), the damper plate (7) and the valve seat (3) being jointly connected and clamped against one another.

Description

[0001] Gas metering valve with damper plate

[0002] Technical field of the invention

[0003] The present invention relates to a gas metering valve comprising a valve housing, wherein a valve seat and a valve plate are arranged in the valve housing, the valve seat having at least one flow opening and the valve plate having a sealing surface, the sealing surface of the valve plate facing the valve seat and configured to interact with the valve seat to open the at least one flow opening of the valve seat in an open state of the gas metering valve and to close it in a closed state of the gas metering valve for metering a gas, wherein an electromagnet and a movable magnetic armature are further arranged in the valve housing, the magnetic armature being connected to the valve plate and configured to interact with the electromagnet during operation of the gas metering valve to move the valve plate connected to the magnetic armature for metering the gas.wherein the valve plate has a valve stop surface axially opposite the sealing surface, wherein a damper plate is further arranged in the valve housing, wherein the damper plate is arranged axially opposite the valve seat, wherein a valve chamber is formed between the damper plate and the valve seat in which the valve plate is movable, and wherein the damper plate has a stop surface which faces the valve stop surface of the valve plate, wherein in the open state of the gas metering valve the valve plate with the valve stop surface rests against the stop surface of the damper plate and in the closed state of the gas metering valve the valve stop surface of the valve plate is spaced apart from the stop surface of the damper plate, wherein a clamping element for the damper plate is provided which connects the damper plate to the valve seat and clamps them against each other, wherein the clamping element comprises a clamping disc.

[0004] State of the art

[0005] Gas metering valves are used to control the flow rate of a gaseous working medium, such as natural gas or hydrogen. The valve body of the gas metering valve contains a valve seat with at least one, and usually multiple, flow openings for the gaseous working medium. The valve seat is covered by a valve plate to close the flow openings and thus the gas metering valve. To open the gas metering valve, the valve plate is lifted from the valve seat. The valve plate typically comprises multiple concentrically arranged sealing rings connected by radial webs, with flow openings for the gaseous working medium also formed between these webs. These flow openings are preferably of the same shape as the flow openings of the valve seat.

[0006] The valve housing of an electromagnetically actuated gas metering valve contains a magnetic armature connected to the valve plate. Furthermore, an electromagnet is integrated into the valve housing. When electrical energy is supplied, this electromagnet interacts magnetically with the armature, thereby moving it. The connection between the armature and the valve plate also moves the plate, lifting it from the valve seat and opening the flow ports for metering the gaseous working medium. The valve plate is typically returned to its original position by a return spring acting upon it.

[0007] To prevent contact between the magnetic armature and the sensitive active surface of the electromagnet, a valve plate stop is provided for the valve plate (as disclosed in EP 3545185 B1). However, a disadvantage of this design is that the valve plate and the valve plate stop can wear relatively quickly due to the high loads, and the impact can cause vibrations in the gas metering valve, which are emitted as a disturbing noise into the vicinity of the gas metering valve. Thus, excessive wear of the valve plate or the valve plate stop can not only lead to malfunctions of the gas metering valve, but also to an annoying noise level during operation of the gas metering valve.

[0008] Summary of the invention

[0009] It is an object of the present invention to optimize the operation of a gas metering valve, in particular to reduce the wear of the gas metering valve and to minimize the vibrations of the gas metering valve caused by its operation, which in particular affect the noise level of the gas metering valve as sound emissions.

[0010] According to the invention, the problem is solved by using a plastic damper plate. Acting as a valve plate stop, the plastic damper plate provides better damping of the valve plate during operation of the gas metering valve, thus reducing wear. Furthermore, the damper plate stops the propagation of vibrations within the gas metering valve itself, thereby reducing noise generation and thus sound emissions to the surroundings, while also improving material fatigue resistance. The (full-)surface support of the valve plate against the damper plate reduces the bending stress on the plate. This allows for a reduction in plate thickness and consequently a reduction in moving mass, resulting in improved valve dynamics (faster opening and closing). The stationary damper plate also eliminates relative movement compared to moving damping elements, minimizing wear.Furthermore, an expensive coating of the valve plate stop can be dispensed with, which is particularly relevant in the dry running of the gas metering valve.

[0011] According to the invention, a clamping element is provided for the damper plate, which connects the damper plate to the valve seat and clamps them against each other. This compensates for settling losses of the damper plate, particularly those caused by thermal expansion and relaxation, in a simple manner.

[0012] The clamping element comprises a clamping disc, the clamping disc bearing against a side of the damper plate facing away from the stop surface, and the clamping disc, the damper plate, and the valve seat being connected and preloaded against each other, preferably by means of at least one screw with a Belleville spring. The clamping disc ensures a more even distribution of the preload on the damper plate.

[0013] Preferably, the plastic of the damper plate is fiber-reinforced, preferably with carbon fiber, glass fiber, or mineral fiber. Polyphenylene sulfide or polyetheretherketone is particularly preferred as the fiber-reinforced plastic of the damper plate. This results in a wide selection of plastics, making various embodiments conceivable.

[0014] In a preferred embodiment of the gas metering valve, the valve seat is divided into two parts: a valve seat plate and a valve seat support plate. This also reduces the overall wear of the gas metering valve, since only the valve seat plate, which interacts with the valve plate, needs to be replaced, while the valve seat support plate can be reused.

[0015] In a preferred embodiment, at least one screw with a disc spring is provided as the clamping element for the damper plate, wherein the disc spring is arranged axially between a screw head of the at least one screw and the valve seat. The disc spring can be provided at different locations axially along the screw, thereby allowing for different configurations of the gas metering valve.

[0016] In a preferred embodiment of the gas metering valve, a stroke ring is arranged axially between the damper plate and the valve seat, or axially between the clamping disc and the valve seat. The stroke ring has a predefined thickness to define the stroke of the valve plate within the valve chamber. Depending on the design and application of the gas metering valve, the valve chamber and thus the stroke of the valve plate can be easily and flexibly adjusted by changing the thickness of the stroke ring.

[0017] Preferably, the assembly consisting of at least the damper plate, the valve seat, and the valve plate with the attached magnetic armature is detachably connected to the valve housing, preferably via the valve seat, and particularly preferably via the valve seat support plate. This allows the entire assembly to be replaced easily and quickly during servicing or maintenance work on the gas metering valve.

[0018] In a preferred embodiment of the gas metering valve, the damper plate is arranged axially between the valve plate and the electromagnet, and the damper plate has a central guide recess through which the magnetic armature extends. This central guide recess is designed to limit a predetermined radial offset between the magnetic armature and the valve plate connected to the magnetic armature, so that in the closed state of the gas metering valve, despite the radially offset valve plate, at least one flow opening of the valve seat remains closed. The damper plate thus simultaneously serves as a guide for the magnetic armature, and in the event of a failure, it acts as a kind of fail-safe mechanism.

[0019] Preferably, at least one recess is provided in the damper plate in which a guide spring for the valve plate is arranged, the guide spring being connected to the valve plate and designed to exert a spring force on the valve plate and bias it into the closed state of the gas metering valve. This improves the tightness of the gas metering valve in the closed state.

[0020] In a preferred embodiment of the gas metering valve, a spacer ring is arranged axially between the damper plate and the electromagnet or between the clamping disk and the electromagnet. The electromagnet is arranged to be axially movable within the valve housing, and a return spring for the electromagnet is provided in the valve housing. This return spring is designed to exert a spring force on the electromagnet to clamp it against the spacer ring. This allows, in particular, height variations due to thermal and relaxation-related settling losses of the damper plate to be compensated for, and prevents the individual components in the gas metering valve from loosening.

[0021] Character description

[0022] The present invention is explained in more detail below with reference to Figures 1 to 3, which show exemplary, schematic, and non-limiting advantageous embodiments of the invention. Figure 1 shows a sectional view of a gas metering valve according to the invention, Figure 2 shows a sectional view of another embodiment of the gas metering valve, and Figure 3 shows a preferred embodiment of the damper plate.

[0023] Fig. 1 shows a sectional view of a preferred embodiment of the gas metering valve 1 according to the invention. The gas metering valve 1 basically comprises a valve housing 2, wherein a valve seat 3, a valve plate 4, an electromagnet 5, a magnetic armature 6 and a damper plate 7 are arranged in the valve housing 2.

[0024] The gas metering valve 1 has a gas inlet E and a gas outlet A, wherein the gas inlet E and the gas outlet A are connected in the valve housing 2 by at least one flow channel 15. The gas inlet E and the gas outlet A can, in principle, be located at any point in the valve housing 2. Through the interaction of the valve plate 4 of the gas metering valve 1 with the valve seat 3, the flow channel 15 is opened when the gas metering valve 1 is open and closed when the gas metering valve 1 is closed. Thus, over the opening time (depending on the gas pressure and the gaseous working medium), the gas metering valve 1 meters a gaseous working medium, such as natural gas or hydrogen, and releases a metered quantity of the gaseous working medium at the gas outlet A (for example, into a combustion chamber of an internal combustion engine).

[0025] In the embodiment shown in Figures 1 and 2, the gas inlet E of the gas metering valve 1 is provided at one axial end of the valve housing 2. The valve seat 3, which forms the gas outlet A of the gas metering valve 1, is preferably arranged at the opposite axial end of the valve housing 2. The valve seat 3 has at least one flow opening 30, which is opened or closed by interaction with the valve plate 4. Depending on the embodiment, a suitable number of flow openings 30 can be provided, which form the largest possible flow cross-section to allow the flow of the largest possible quantity of gas.

[0026] The valve seat 3 of the gas metering valve 1 according to the invention is preferably designed in two parts, comprising a valve seat plate 3a and a valve seat support plate 3b axially abutting it. The valve seat plate 3a interacts with the valve plate 4 to open and close the gas metering valve 1. In this case, both the valve seat support plate 3b and the valve seat plate 3a have flow openings for the gaseous working medium.

[0027] The valve seat 3 is preferably detachably connected to the valve housing 2, for example by screws (not shown). In the case of a two-part valve seat 3, the valve seat support plate 3b is preferably connected to the valve housing 2. In the illustrated embodiment, the gas metering valve 1 is axially flowed through. However, it is of course also possible for the gaseous working medium to be metered to be supplied at a suitable location in the valve housing 2 through a radially designed gas inlet E or discharged at a differently arranged gas outlet A.

[0028] The valve plate 4 is preferably disc-shaped and has a sealing surface DF on a first end face. The sealing surface DF of the valve plate 4 faces the valve seat 3 during operation. The sealing surface DF is that part of the first end face of the valve plate 4 which, during operation of the gas metering valve 1, interacts with the valve seat 3 to meter the gaseous working medium by opening or closing the at least one flow opening 30. The valve seat 3 and the valve plate 4 are generally made of a solid material, e.g., metal such as steel, or a fiber-reinforced plastic.

[0029] The valve plate 4 can also have a number of flow openings 40 in a known manner, which are, for example, designed as a number of concentric sealing rings connected to each other by radial webs distributed around the circumference. The number of flow openings 40 of the valve plate 4 should provide the largest possible flow cross-section to enable the flow of the largest possible quantity of gas per unit of time. The flow openings 40 of the valve plate 4 are opened by the interaction of the valve plate 4 with the valve seat 3 when the gas metering valve 1 is open and closed when the gas metering valve 1 is closed.

[0030] The magnetic armature 6 is designed to interact with the electromagnet 5 during operation of the gas metering valve 1 to move the valve plate 4 for metering the gaseous working medium, with the valve plate 4 being connected to the magnetic armature 6 for this purpose. As shown in Figures 1 and 2, an axial end of the magnetic armature 6, which faces away from the electromagnet 5, is connected to the valve plate 4. Preferably, the valve plate 4 is connected to the magnetic armature 6 via a centrally arranged screw 18. This makes it easy to replace the valve plate 4. Furthermore, this type of connection is advantageous due to the different material requirements of the magnetic armature 6 and the valve plate 4. Alternatively, and if possible, the valve plate 4 can also be connected to the magnetic armature 6 in another way, in particular by frictional connection, positive connection, or material connection, such as welding or bonding.

[0031] The supply of electric current to the electromagnet 5, in order to move the magnetic armature 6 and the associated valve plate 4, can be effected via a connector 19 in the valve housing 2. According to the invention, the damper plate 7, made of plastic, is provided in the valve housing 2. The damper plate 7 has a greater radial dimension than axial dimension. The plastic of the damper plate 7 is preferably fiber-reinforced. For example, the plastic of the damper plate 7 is reinforced with carbon fiber, glass fiber, or mineral fiber. Polyphenylene sulfide (PPS) or polyetheretherketone (PEEK) is preferably provided as the fiber-reinforced plastic of the damper plate 7.

[0032] The damper plate 7 is arranged axially opposite the valve seat 3. A valve chamber 12 is formed between the damper plate 7 and the valve seat 3, in which the valve plate 4 is movable. Depending on the embodiment, the damper plate 7 can, for example, be arranged axially between the valve seat 3 and the electromagnet 5 and the magnetic armature 6 (as shown in Figures 1 and 2). Alternatively, it would also be possible for the valve seat 3 to be arranged axially between the damper plate 7 and the electromagnet 5. Crucially, the sealing surface DF of the valve plate 4 faces the valve seat 3, and an end face of the valve plate 4 axially opposite the sealing surface DF faces the damper plate 7. The valve plate 4 has a valve stop surface VAF on a second end face axially opposite the sealing surface DF, which faces the damper plate 7.The valve stop surface VAF is part of the second end face of the valve plate 4, preferably the entire second end face, which interacts with the damper plate 7 during operation of the gas metering valve 1.

[0033] According to the invention, the damper plate 7 has a stop surface AF on one end face, which faces the valve plate 4 or the valve stop surface VAF of the valve plate 4. The stop surface AF is that part of the end face of the damper plate 7, preferably the entire end face, which interacts with the valve stop surface VAF of the valve plate 4 during operation of the gas metering valve 1. In the open state of the gas metering valve 1, the valve plate 4 with the valve stop surface VAF rests against the stop surface AF of the damper plate 7. In the closed state of the gas metering valve 1, the valve stop surface VAF of the valve plate 4 is axially spaced from the stop surface AF of the damper plate 7. The stop of the valve plate 4 against the damper plate 7 is designed such that, in the open state of the gas metering valve 1, a residual air gap remains between the electromagnet 5 and the magnetic armature 6, so that the magnetic armature 6 never strikes the electromagnet 5.

[0034] As shown in Figures 1 and 2, the damper plate 7 is preferably arranged axially between the valve plate 4 and the electromagnet 5. The damper plate 7 has a central guide recess 7a through which the magnetic armature 6 extends. The central guide recess 7a is designed to limit a predetermined radial offset between the magnetic armature 6 and the valve plate 4 connected to the magnetic armature 6. The maximum permissible radial offset is selected depending on the embodiment of the valve plate 4 and the valve seat 3, in particular the respective flow openings, such that, in the closed state of the gas metering valve 1, despite the radially offset valve plate 4, at least one flow opening 30 of the valve seat 3 remains closed and thus the flow channel 15 of the gas metering valve 1 is interrupted.Determining the radial offset and thus the dimensioning of the centric guide recess 7a is within the capabilities of an average professional. Because the damper plate 7 is made of plastic (a tribologically favorable material), friction and wear of the magnetic armature 6 are reduced.

[0035] Preferably, a clamping element 8 is provided for the damper plate 7, which connects the damper plate 7 to the valve seat 3 and clamps them against each other. For example, the clamping element 8 for the damper plate 7 is designed as at least one screw 9 with an optional disc spring 10. The clamping element 8 can optionally also include a clamping washer 11. The clamping washer 11 is connected to the damper plate 7 and the valve seat 3 via at least one screw 9, which can include a disc spring 10, and clamped against each other, as shown in Figures 1 and 2. The clamping washer 11 is arranged in contact with a surface of the damper plate 7 facing away from the stop surface AF. The disc spring 10 is arranged axially between a screw head 9a of the at least one screw 9 and the valve seat 3. In principle, the disc spring 10 can be arranged at any position along the screw 9. As shown in Figures 1 and 2, the clamping washer 11 is located on a surface of the damper plate 7 facing away from the stop surface AF.As shown in Figures 1 and 2, the disc spring 10 of the respective screw 9 is arranged axially between the screw head 9a of the screw 9 and the clamping washer 11. The damper plate 7 can have a number of screw recesses 7d through which one of the screws 9 extends. As shown in Figure 3, for example, six screw recesses 7d are provided, which are evenly spaced from one another in the circumferential direction of the damper plate 7.

[0036] A stroke ring 13 is preferably arranged between the damper plate 7 and the valve seat 3. The stroke ring 13 rests axially against the damper plate 7 and the valve seat 3 or the valve seat plate 3a. The stroke ring 13 has a predefined thickness to define the valve chamber 12 and, consequently, the stroke of the valve plate 4 within the valve chamber 12. As an alternative to the embodiments shown in Figures 1 and 2, the stroke ring 13 can also be arranged axially between the clamping disk 11 and the valve seat 3. This would be the case, for example, in Figures 1 and 2, if the damper plate 7 does not extend completely to the inner edge of the valve housing 2 and is arranged radially within the stroke ring 13. If no stroke ring 13 is provided, the damper plate 7 and / or the valve seat 3 can, for example, be designed accordingly to form the valve chamber 12.The hub ring 13 is preferably connected to the damper plate 7 by the screw 9, and optionally to the clamping plate 11, to the valve seat 3.

[0037] Preferably, an assembly 20 consisting of at least the damper plate 7, the valve seat 3, and the valve plate 4 with an attached magnetic armature 6 is detachably connected to the valve housing 2. The assembly 20 is detachably connected to the valve housing 2, for example, via the valve seat 3, and preferably, if present, via the valve seat support plate 3b. For example, the assembly 20 is connected to the valve housing 2 via the valve seat support plate 3b by means of screws (not shown). As shown in Figures 1 and 2, the assembly 20 particularly preferably comprises the damper plate 7, the valve seat 3 (designed as valve seat plate 3a and valve seat support plate 3b), the valve plate 4 with the attached magnetic armature 6, the clamping disc 11, and the piston ring 13, which are connected to each other via the screws 9 with disc springs 10. Of course, the assembly 20 is not limited to this embodiment, and other embodiments are conceivable (e.g.,(without hub ring 13 and / or without tension washer 11). The assembly 20 can therefore be removed as a whole by detaching it from the valve housing 2.

[0038] The damper plate 7 preferably has at least one spring recess 7b in which a guide spring 14 for the valve plate 4 is arranged. The guide spring 14 is connected to the valve plate 4 and is designed to exert a spring force on the valve plate 4 and bias it into the closed position of the gas metering valve 1. The guide spring 14 keeps the gas metering valve 1 closed when the electromagnets 5 are not energized, or closes the gas metering valve 1. As shown in Fig. 3, the spring recesses 7b for the guide springs 14 extend through the damper plate 7, and as can be seen in Figs. 1 and 2, the guide springs 14 extend through the damper plate 7 and are arranged on the clamping disk 11. For example, six spring recesses 7b are provided in the damper plate 7, which are spaced evenly apart from each other in the circumferential direction of the damper plate 7.

[0039] The damper plate 7 can further have a number of flow-through openings 7c, which are, for example, designed as a number of circular bores. When the flow channel 15 is open, the gaseous working medium flows through the number of flow-through openings 7c, which should form the largest possible flow cross-section to allow the flow of the largest possible quantity of gas. For example, six flow-through openings 7c are provided in the damper plate 7, which are evenly spaced from one another in the circumferential direction of the damper plate 7. Corresponding flow-through openings can also be provided in the clamping disk 11, if present (not shown). As shown in the embodiment according to Fig. 2, a spacer ring 16 is preferably arranged axially between the clamping disk 11 and the electromagnet 5.Alternatively, and if no clamping washer 11 is present, the spacer ring 16 can also be arranged axially between the damper plate 7 and the electromagnet 5. The electromagnet 5 is arranged to be axially movable within the valve housing 2, and a return spring 17 is provided for the electromagnet 5 within the valve housing 2. This return spring is designed to exert a spring force on the electromagnet 5 to compress it against the spacer ring 16. The return spring 17 can, for example, be a disc spring. The return spring 17 is preferably arranged between the electromagnet 5 and an end cap 21, which is detachably connected to the housing 2 (e.g., by screws 22). In Fig. 1, the end cap 21 is shown without the return spring 17. Alternatively, as shown in Fig. 2, a plunger 23 can also be provided within the housing 2, which is movably arranged between the end cap 21 and the electromagnet 5.In this case, the return spring 17 is arranged between the end cap 21 and the plunger 23, with the return spring 17 pressing the plunger 23 against the electromagnet 5. This preloads the individual components within the valve housing 2 against each other and prevents them from loosening, e.g., in the event of deformation of the damper plate 7.

Claims

Patent claims 1. Gas metering valve (1) comprising: a valve housing (2) wherein a valve seat (3) and a valve plate (4) are arranged in the valve housing (2), wherein the valve seat (3) has at least one flow opening (30) and the valve plate (4) has a sealing surface (DF), wherein the sealing surface (DF) of the valve plate (4) faces the valve seat (3) and is configured to interact with the valve seat (3) in order to release the at least one flow opening (30) of the valve seat (3) in an open state of the gas metering valve (1) and to close it in a closed state of the gas metering valve (1) for metering a gas with the gas metering valve (1), wherein an electromagnet (5) and a movable magnetic armature (6) are further arranged in the valve housing (2), wherein the magnetic armature (6) is connected to the valve plate (4) and the magnetic armature (6) is designed to cooperate with the electromagnet (5) during operation of the gas metering valve (1) in order to move the valve plate (4) connected to the magnetic armature (6) for metering the gas, wherein the valve plate (4) has a valve stop surface (VAF) axially opposite the sealing surface (DF), wherein a damper plate (7) is further arranged in the valve housing (2), wherein the damper plate (7) is arranged axially opposite the valve seat (3), wherein a valve chamber (12) is formed between the damper plate (7) and the valve seat (3), in which the valve plate (4) is movable, wherein the damper plate (7) has a stop surface (AF) which faces the valve stop surface (VAF) of the valve plate (4), wherein in the open state of the gas metering valve (1) the valve plate (4) with the valve stop surface (VAF) rests against the stop surface (AF) of the damper plate (7) and in the closed state of the gas metering valve (1) the valve stop surface (VAF) of the valve plate (4) is spaced apart from the stop surface (AF) of the damper plate (7), wherein a clamping element (8) is provided for the damper plate (7), which connects the damper plate (7) to the valve seat (3) and clamps them against each other, wherein the clamping element (8) comprises a clamping disc (11), characterized in that the damper plate (7) is made of plastic, and that the clamping disc (11) rests against a side of the damper plate (7) facing away from the stop surface (AF), and that the clamping disc (11), the damper plate (7) and the valve seat (3) are connected together and clamped against each other.

2. Gas metering valve (1) according to claim 1, characterized in that the plastic of the damper plate (7) is fiber reinforced, preferably with carbon fiber, glass fiber or mineral fiber.

3. Gas metering valve (1) according to claim 2, characterized in that the fiber-reinforced plastic of the damper plate (7) is polyphenylene sulfide or polyetheretherketone.

4. Gas metering valve (1) according to one of claims 1 to 3, characterized in that the valve seat (3) is designed in two parts as a valve seat plate (3a) and a valve seat support plate (3b).

5. Gas metering valve (1) according to one of claims 1 to 4, characterized in that the clamping disc (11), the damper plate (7) and the valve seat (3) are jointly connected to a disc spring (10) by means of at least one screw (9) and are preloaded against each other.

6. Gas metering valve (1) according to one of claims 1 to 5, characterized in that a stroke ring (13) is arranged axially between the damper plate (7) and the valve seat (3) or axially between the clamping disk (11) and the valve seat (3), wherein the stroke ring (13) has a predefined thickness to define a stroke of the valve plate (4) in the valve chamber (12).

7. Gas metering valve (1) according to one of claims 1 to 6, characterized in that the assembly (20) consisting of at least the damper plate (7), the valve seat (3) and the valve plate (4) with connected magnetic armature (6) is detachably connected to the valve housing (2), preferably via the valve seat (3), particularly preferably via the valve seat support plate (3b).

8. Gas metering valve (1) according to one of claims 1 to 7, characterized in that the damper plate (7) is arranged axially between the valve plate (4) and the electromagnet (5) and the damper plate (7) has a central guide recess (7a) through which the magnetic armature (6) extends, wherein the central guide recess (7a) is designed to limit a predetermined radial offset of the magnetic armature (6) and the valve plate (4) connected to the magnetic armature (6), so that in the closed state of the gas metering valve (1) despite radially offset valve plate (4) the at least one flow opening (30) of the valve seat (3) is closed.

9. Gas metering valve (1) according to one of claims 1 to 8, characterized in that at least one spring recess (7b) is provided in the damper plate (7) in which a guide spring (14) for the valve plate (4) is arranged, wherein the guide spring (14) is connected to the valve plate (4) and the guide spring (14) is designed to act on the valve plate (4) with a spring force and to bias it into the closed state of the gas metering valve (1).

10. Gas metering valve (1) according to one of claims 1 to 9, characterized in that a spacer ring (16) is arranged axially between the clamping disk (11) and the electromagnet (5), wherein the electromagnet (5) is arranged axially movable in the valve housing (2) and that a return spring (17) for the electromagnet (5) is provided in the valve housing (2), which is designed to act on the electromagnet (5) with a spring force in order to tension it against the spacer ring (16).

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