CN211574378U

CN211574378U - Electromagnetic valve

Info

Publication number: CN211574378U
Application number: CN202020015537.6U
Authority: CN
Inventors: 俞舟
Original assignee: Dunan Environment Technology Co Ltd
Current assignee: Dunan Environment Technology Co Ltd
Priority date: 2020-01-03
Filing date: 2020-01-03
Publication date: 2020-09-25
Anticipated expiration: 2030-01-03

Abstract

The utility model provides a solenoid valve, which comprises a valve body component and a piston component, wherein the valve body component is provided with a containing cavity, an inlet and an outlet which are communicated with the containing cavity; the piston component is movably arranged in the accommodating cavity and comprises an outer piston, an inner piston structure and a first sealing gasket, the inner piston structure is arranged in the cavity of the outer piston, the first sealing gasket is arranged between the outer piston and the inner piston structure, the end part of the outer piston is in limit fit with the outer periphery of the annular sealing surface, and the end part of the inner piston structure is in limit fit with the inner periphery of the annular sealing surface; the piston component has a closed position and an open position, and when the piston component is in the closed position, the piston component blocks the outlet, and the annular sealing surface is abutted with the periphery of the outlet; with the piston member in the open position, the piston member is clear of the outlet and the inlet. By adopting the scheme, the rigidity and the deformation resistance of the sealing gasket are improved, so that the reliability of the electromagnetic valve is improved, and the service life of the electromagnetic valve is prolonged.

Description

Electromagnetic valve

Technical Field

The utility model relates to a solenoid valve technical field particularly, relates to a solenoid valve.

Background

When the valve is opened, the inner periphery of an annular sealing gasket in the piston component is forced upwards, and the outer periphery of the annular sealing gasket is forced downwards, so that the sealing gasket is deformed, and particularly in a high-pressure occasion, the sealing gasket is deformed seriously, so that the piston component is failed, and the sealing is poor.

Disclosure of Invention

The utility model provides a solenoid valve to avoid the sealed pad among the solenoid valve to warp, improve the reliability.

In order to achieve the above object, the present invention provides a solenoid valve, including: the valve body component is provided with a containing cavity, an inlet and an outlet which are communicated with the containing cavity; the piston component is movably arranged in the accommodating cavity and comprises an outer piston, an inner piston structure and a first sealing gasket, the inner piston structure is arranged in a cavity of the outer piston, the first sealing gasket is arranged between the outer piston and the inner piston structure, the end face, facing the outlet, of the first sealing gasket is an annular sealing surface, the end part of the outer piston is in limit fit with the outer periphery of the annular sealing surface, and the end part of the inner piston structure is in limit fit with the inner periphery of the annular sealing surface; the piston component has a closed position and an open position, and when the piston component is in the closed position, the piston component blocks the outlet, and the annular sealing surface is abutted with the periphery of the outlet; with the piston member in the open position, the piston member is clear of the outlet and the inlet.

Further, the inner piston structure comprises an inner piston and a gasket arranged at the end part of the inner piston, the inner piston is in limit fit with the outer piston, the first sealing gasket is arranged between the outer piston and the inner piston, and the gasket is in limit fit with the inner periphery of the annular sealing surface.

Further, the outer piston comprises an outer cylinder and a first limiting ring arranged at one end, close to the outlet, of the outer cylinder, and the outer wall of the outer cylinder is matched with the inner wall of the accommodating cavity; the inner piston comprises a first inner cylinder and a second inner cylinder which are connected with each other, the outer diameter of the second inner cylinder is smaller than that of the first inner cylinder, the first inner cylinder is in limit fit with the outer cylinder, and the gasket is arranged on the second inner cylinder; the first sealing gasket is positioned in an area formed by surrounding the outer cylinder, the first inner cylinder and the second inner cylinder, the first limiting ring is in limiting fit with the outer peripheral edge of the annular sealing surface, and the end surface of the first inner cylinder is abutted against one side, deviating from the outlet, of the first sealing gasket.

Furthermore, the inner wall of the outer piston is provided with a first limiting step, the outer wall of the inner piston is provided with a second limiting step, and the first limiting step is matched with the second limiting step.

Further, outer piston includes outer barrel and sets up the second spacing ring of the one end of keeping away from of outer barrel the export, first spacing step is located on the inner wall of outer barrel, the second spacing ring with interior piston riveting.

Further, the inner piston has an inner balance hole, the outer piston has an outer balance hole, the cavity that is located on one side of the piston part that deviates from the outlet of the accommodation cavity is communicated with the inner balance hole, the inner balance hole is communicated with the outer balance hole, and the outer balance hole is communicated with the inlet.

Further, the inner piston has a first annular groove disposed around an outer wall of the inner piston, the inner balance hole and the outer balance hole both communicating with the first annular groove.

Further, the inner piston structure further comprises: the second sealing gasket is arranged at one end, far away from the outlet, of the inner piston, and is provided with a valve guide port which is communicated with the through hole of the inner piston, and the through hole of the inner piston is communicated with the outlet.

Further, the outer piston has a second annular groove disposed around an outer wall of the outer piston, the piston member further comprising: the elastic ring is arranged in the second annular groove, a gap is formed in the side wall of the elastic ring, and the radial section of the elastic ring is rectangular; and the sealing ring is arranged in the second annular groove, the inner wall of the sealing ring is abutted to the outer wall of the elastic ring, and the outer wall of the sealing ring is abutted to the inner wall of the accommodating cavity.

Further, the valve body member includes a valve seat member and a valve cover member connected to each other, the receiving chamber, the inlet port and the outlet port are all located in the valve seat member, and the solenoid valve further includes a needle member movably disposed in the valve cover member, the needle member cooperating with the piston member.

The technical scheme of the utility model is applied, a solenoid valve is provided, the solenoid valve comprises a valve body component and a piston component, wherein, the valve body component is provided with a containing cavity, an inlet and an outlet which are communicated with the containing cavity; the piston component is movably arranged in the accommodating cavity and comprises an outer piston, an inner piston structure and a first sealing gasket, the inner piston structure is arranged in the cavity of the outer piston, the first sealing gasket is arranged between the outer piston and the inner piston structure, the end face, facing the outlet, of the first sealing gasket is an annular sealing surface, the end part of the outer piston is in limit fit with the outer periphery of the annular sealing surface, and the end part of the inner piston structure is in limit fit with the inner periphery of the annular sealing surface; the piston component has a closed position and an open position, and when the piston component is in the closed position, the piston component blocks the outlet, and the annular sealing surface is abutted with the periphery of the outlet; with the piston member in the open position, the piston member is clear of the outlet and the inlet. Adopt above-mentioned scheme, the tip through outer piston and the tip of interior piston structure can all carry on spacingly and support to the outer peripheral edge and the interior periphery of the annular seal face of first sealed pad, has improved the rigidity and the compressive capacity of first sealed pad like this, so even open the valve under the high pressure difference, sealed pad is difficult deformation not yet, has improved reliability and life.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural diagram of a solenoid valve provided in an embodiment of the present invention;

FIG. 2 shows a schematic structural view of the piston assembly of FIG. 1;

FIG. 3 shows a schematic view of the elastic ring of FIG. 1;

FIG. 4 shows a schematic structural view of the valve cover component of FIG. 1;

figure 5 shows a schematic view of the valve needle component of figure 1.

Wherein the figures include the following reference numerals:

10. a valve body member; 11. an inlet; 12. an outlet; 13. a valve seat member; 14. a bonnet member; 15. a suction member; 16. a sleeve; 17. a valve cover; 18. a first spring; 20. an outer piston; 21. an outer cylinder; 22. a first limit ring; 23. a first limit step; 24. a second stop collar; 25. an outer balance hole; 26. a second annular groove; 31. a first gasket; 32. a gasket; 33. a second gasket; 34. a valve guide port; 35. an elastic ring; 36. a seal ring; 40. an inner piston; 41. a first inner cylinder; 42. a second inner cylinder; 43. a second limit step; 44. an inner balance hole; 45. a first annular groove; 50. a valve needle component; 51. a core iron; 52. a valve needle; 53. a second spring; 54. a gasket.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in the drawings, embodiments of the present invention provide a solenoid valve, including: a valve body part 10, wherein the valve body part 10 is provided with a containing cavity, an inlet 11 and an outlet 12 which are communicated with the containing cavity; the piston component is movably arranged in the accommodating cavity and comprises an outer piston 20, an inner piston structure and a first sealing gasket 31, the inner piston structure is arranged in the cavity of the outer piston 20, the first sealing gasket 31 is arranged between the outer piston 20 and the inner piston structure, the end surface, facing the outlet 12, of the first sealing gasket 31 is an annular sealing surface, the end part of the outer piston 20 is in limit fit with the outer periphery of the annular sealing surface, and the end part of the inner piston structure is in limit fit with the inner periphery of the annular sealing surface; the piston component has a closed position and an open position, and when the piston component is in the closed position, the piston component blocks the outlet 12, and the annular sealing surface is abutted with the periphery of the outlet 12; with the piston member in the open position, the piston member is clear of the outlet 12 and the inlet 11.

The technical scheme of the utility model is applied, a solenoid valve is provided, the solenoid valve comprises a valve body part 10 and a piston part, wherein, the valve body part 10 is provided with a containing cavity, an inlet 11 and an outlet 12 which are communicated with the containing cavity; the piston component is movably arranged in the accommodating cavity and comprises an outer piston 20, an inner piston structure and a first sealing gasket 31, the inner piston structure is arranged in the cavity of the outer piston 20, the first sealing gasket 31 is arranged between the outer piston 20 and the inner piston structure, the end surface, facing the outlet 12, of the first sealing gasket 31 is an annular sealing surface, the end part of the outer piston 20 is in limit fit with the outer periphery of the annular sealing surface, and the end part of the inner piston structure is in limit fit with the inner periphery of the annular sealing surface; the piston component has a closed position and an open position, and when the piston component is in the closed position, the piston component blocks the outlet 12, and the annular sealing surface is abutted with the periphery of the outlet 12; with the piston member in the open position, the piston member is clear of the outlet 12 and the inlet 11. Adopt above-mentioned scheme, can all carry on spacingly and support to the outer peripheral edge and the interior peripheral edge of the annular seal face of first sealed pad 31 through the tip of outer piston 20 and the tip of interior piston structure, improved rigidity and the compressive capacity of first sealed pad 31 like this, even so open the valve under the high pressure difference, sealed pad is difficult for the deformation, has improved reliability and life.

In the present embodiment, the inner piston structure includes an inner piston 40 and a gasket 32 disposed at an end portion of the inner piston 40, the inner piston 40 is in limit fitting with the outer piston 20, the first packing 31 is disposed between the outer piston 20 and the inner piston 40, and the gasket 32 is in limit fitting with an inner peripheral edge of the annular sealing surface. This increases the contact area with the inner periphery of the annular seal surface by the gasket 32, thereby improving the stopper effect.

Specifically, the outer piston 20 comprises an outer cylinder 21 and a first limit ring 22 arranged at one end of the outer cylinder 21 close to the outlet 12, and the outer wall of the outer cylinder 21 is matched with the inner wall of the accommodating cavity; the inner piston 40 comprises a first inner cylinder 41 and a second inner cylinder 42 which are connected with each other, the outer diameter of the second inner cylinder 42 is smaller than that of the first inner cylinder 41, the first inner cylinder 41 is in limit fit with the outer cylinder 21, and the gasket 32 is arranged on the second inner cylinder 42; the first sealing gasket 31 is located in the area formed by the outer cylinder 21, the first inner cylinder 41 and the second inner cylinder 42, the first limiting ring 22 is in limited fit with the outer periphery of the annular sealing surface, and the end surface of the first inner cylinder 41 is abutted against one side of the first sealing gasket 31 departing from the outlet 12. Through the above arrangement, two end faces and two annular faces of the first sealing gasket 31 can be supported and limited, the outer peripheral edge and the inner peripheral edge of the annular sealing surface are limited, the deformation resistance of the first sealing gasket 31 is improved, and therefore deformation of the first sealing gasket 31 is avoided.

Optionally, the second inner cylinder 42 has a limit step in limit fit with the gasket 32, and the second inner cylinder 42 is riveted with the gasket 32, so that the reliable connection between the second inner cylinder 42 and the gasket 32 is realized.

In this embodiment, the inner wall of the outer piston 20 has a first limit step 23, the outer wall of the inner piston 40 has a second limit step 43, and the first limit step 23 is matched with the second limit step 43. With the above arrangement, accurate positioning of the outer piston 20 and the inner piston 40 is achieved, and pressing of the first packing 31 at the time of assembly can be avoided.

In this embodiment, the outer piston 20 includes an outer cylinder 21 and a second limiting ring 24 disposed at an end of the outer cylinder 21 away from the outlet 12, the first limiting step 23 is located on an inner wall of the outer cylinder 21, and the second limiting ring 24 is riveted with the inner piston 40. By the arrangement, the reliable connection of the outer piston 20 and the inner piston 40 is realized, and the riveting mode is convenient to operate.

In this embodiment the inner piston 40 has an inner balance bore 44 and the outer piston 20 has an outer balance bore 25, the cavity of the receiving chamber on the side of the piston part facing away from the outlet 12 communicating with the inner balance bore 44, the inner balance bore 44 communicating with the outer balance bore 25 and the outer balance bore 25 communicating with the inlet 11. Through the arrangement, the action of the electromagnetic valve is convenient to realize.

Further, the inner piston 40 has a first annular groove 45 provided around the outer wall of the inner piston 40, and the inner balance hole 44 and the outer balance hole 25 are both communicated with the first annular groove 45. The weight of the inner piston 40 can be reduced by the above arrangement, the operation is facilitated, and the communication between the inner balance hole 44 and the outer balance hole 25 is facilitated.

In this embodiment, the inner piston structure further comprises: and a second gasket 33, wherein the second gasket 33 is arranged at one end of the inner piston 40 far away from the outlet 12, the second gasket 33 is provided with a pilot valve port 34, the pilot valve port 34 is communicated with the through hole of the inner piston 40, and the through hole of the inner piston 40 is communicated with the outlet 12. Optionally, the second sealing gasket 33 is in limit fit with the inner piston 40 through a limit step, and one end of the inner piston 40 far away from the outlet is riveted with the second sealing gasket 33. By the above arrangement, a reliable connection of the second gasket 33 to the inner piston 40 is achieved.

In this embodiment, the outer piston 20 has a second annular groove 26 disposed around the outer wall of the outer piston 20, and the piston assembly further comprises: the elastic ring 35 is arranged in the second annular groove 26, a gap is formed in the side wall of the elastic ring 35, and the radial section of the elastic ring 35 is rectangular; and a seal ring 36 disposed in the second annular groove 26, wherein an inner wall of the seal ring 36 abuts against an outer wall of the elastic ring 35, and an outer wall of the seal ring 36 abuts against an inner wall of the accommodating chamber. Thus, the sealing ring 36 can be supported by the elastic ring 35, so that the sealing ring 36 has a tendency of expanding outwards, and the outer wall of the sealing ring 36 is tightly matched with the inner wall of the accommodating cavity, thereby improving the sealing property and reducing the leakage of the piston part. Moreover, the section of the elastic ring 35 is rectangular, so that the radial space can be greatly saved, the installation difficulty is reduced, the tensile force of the sealing ring 36 is improved, and the leakage around the piston component is reduced.

In the present embodiment, the valve body part 10 includes a valve seat part 13 and a valve cover part 14 connected to each other, the receiving chamber, the inlet 11 and the outlet 12 are located in the valve seat part 13, and the solenoid valve further includes a needle part 50, the needle part 50 is movably disposed in the valve cover part 14, and the needle part 50 is engaged with the piston part. The division of the valve body member 10 into two parts, a valve seat member 13 and a bonnet member 14, facilitates manufacture and assembly. The valve cover part 14 and the valve needle part 50 are matched to enable the valve needle part 50 to block or avoid the valve guide port 34 on the second sealing gasket 33 of the piston part, so that the electromagnetic valve can be opened or closed.

Specifically, the valve cover member 14 includes a sleeve 16, a suction member 15 provided in the sleeve 16, and a valve cover 17 connected to the sleeve 16, the valve cover 17 being connected to the valve seat member 13, and the valve cover 17 having an end surface for restricting the piston member. A first spring 18 is further provided in the sleeve 16, and both ends of the first spring 18 are engaged with the attraction piece 15 and the needle member 50, respectively. The valve needle component 50 comprises a core iron 51, a valve needle 52, a second spring 53 and a gasket 54, wherein the core iron 51 is movably arranged in the sleeve 16, the valve needle 52 is arranged in the core iron 51, the valve needle 52 is used for sealing the valve guide opening, the gasket 54 is fixedly connected with the core iron 51, the second spring 53 is sleeved on the valve needle 52, one end of the second spring 53 is abutted against the valve needle 52, and the other end of the second spring 53 is abutted against the gasket 54.

During production, the inner piston 40 is riveted with the first sealing gasket 31 and the gasket 32, and then forms an inner piston structure with the second sealing gasket 33. The inner piston structure is assembled with the outer piston 20, the inner piston 40 and the outer piston 20 are provided with positioning surfaces, the positioning surfaces are positioned by metal positioning surfaces in a contact mode, riveting is conducted, the inner piston 40 and the outer piston 20 can be fixed after riveting, the positioning surfaces of the inner piston 40 and the outer piston 20 are extruded during riveting, the first sealing gasket 31 and the outer piston 20 can be slightly contacted and a certain small gap can be reserved, and the outer end face of the first sealing gasket 31 is not excessively extruded due to accuracy. Therefore, the first packing 31 is not deformed by pressure when the inner piston 40 and the outer piston 20 are riveted, and the flatness of the first packing 31 can be ensured to improve internal leakage. Meanwhile, the inner piston 40 and the outer piston 20 have enough connection rigidity, and the consistency of the overall action of the piston components and the connection strength are ensured.

The piston part is internally provided with a second sealing gasket 33, the second sealing gasket 33 is provided with a pilot valve port 34, and for the nonlinear pilot structure, the piston part can be not provided with the pilot valve port which is independently arranged at other parts.

In another arrangement, not shown, the inner and outer balance holes are eliminated and the valve closing capability is improved by increasing the outer piston damping and increasing the core iron spring force. For example, increasing the spring force of the elastomeric ring 35 may increase the damping of the piston member.

The bonnet member 14 is formed by welding a bonnet 17, a sleeve 16, and a suction member 15, the bonnet 17 is provided with a stopper surface for stopping the piston member, the bonnet 17 is provided with a positioning surface for positioning the valve seat member 13, and the bonnet 17 and the valve seat member 13 are hermetically welded at the positioning surface.

The valve needle part 50 consists of a core iron 51, a valve needle 52 and a second spring 53, the core iron 51 does not need to overcome the pressure difference force when the high-pressure valve opening starts, the elastic force of the second spring 53 and the first spring 18 is overcome, when the core iron 51 moves to a certain distance, the valve needle 52 is driven to move, the electromagnetic force is large at the moment, and after the core iron 51 is completely sucked, the valve needle 52 continues to move upwards under the action of the second spring 53, so that the opening degree of a pilot valve is ensured.

Through the scheme, the pretightening force is arranged on the inner side and the outer side of the first sealing gasket 31, so that the rigidity of the sealing gasket is greatly improved. When the valve is opened under the high pressure difference, when the piston part receives upward force, the inner piston 40 and the outer piston 20 are riveted into a whole, and the first sealing gasket 31 is driven to move upwards, so that the sealing gasket is not easy to deform, the connection strength between the sealing gasket and the piston is improved, further, the inner leakage can be reduced, and the service life of the electromagnetic valve is prolonged.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A solenoid valve, comprising:

a valve body component (10), wherein the valve body component (10) is provided with a containing cavity, and an inlet (11) and an outlet (12) which are communicated with the containing cavity;

the piston component is movably arranged in the accommodating cavity and comprises an outer piston (20), an inner piston structure and a first sealing gasket (31), the inner piston structure is arranged in the cavity of the outer piston (20), the first sealing gasket (31) is arranged between the outer piston (20) and the inner piston structure, the end face, facing the outlet (12), of the first sealing gasket (31) is an annular sealing surface, the end of the outer piston (20) is in limit fit with the outer periphery of the annular sealing surface, and the end of the inner piston structure is in limit fit with the inner periphery of the annular sealing surface;

the piston part has a closed position in which it blocks the outlet (12) and an open position in which the annular sealing surface abuts the peripheral edge of the outlet (12); with the piston member in the open position, the piston member is clear of the outlet (12) and the inlet (11).

2. The electromagnetic valve according to claim 1, characterized in that the inner piston structure comprises an inner piston (40) and a gasket (32) arranged at the end of the inner piston (40), the inner piston (40) being in a limit fit with the outer piston (20), the first sealing gasket (31) being arranged between the outer piston (20) and the inner piston (40), the gasket (32) being in a limit fit with the inner periphery of the annular sealing surface.

3. The solenoid valve of claim 2,

the outer piston (20) comprises an outer cylinder body (21) and a first limiting ring (22) arranged at one end, close to the outlet (12), of the outer cylinder body (21), and the outer wall of the outer cylinder body (21) is matched with the inner wall of the accommodating cavity;

the inner piston (40) comprises a first inner cylinder body (41) and a second inner cylinder body (42) which are connected with each other, the outer diameter of the second inner cylinder body (42) is smaller than that of the first inner cylinder body (41), the first inner cylinder body (41) is in limit fit with the outer cylinder body (21), and the gasket (32) is arranged on the second inner cylinder body (42);

the first sealing gasket (31) is located in an area formed by surrounding the outer cylinder body (21), the first inner cylinder body (41) and the second inner cylinder body (42), the first limiting ring (22) is in limiting fit with the outer periphery of the annular sealing surface, and the end face of the first inner cylinder body (41) is abutted to one side, deviating from the outlet (12), of the first sealing gasket (31).

4. The solenoid valve according to claim 2, characterized in that the inner wall of the outer piston (20) has a first limit step (23) and the outer wall of the inner piston (40) has a second limit step (43), the first limit step (23) cooperating with the second limit step (43).

5. The solenoid valve according to claim 4, characterized in that the outer piston (20) comprises an outer cylinder (21) and a second limit ring (24) arranged at one end of the outer cylinder (21) remote from the outlet (12), the first limit step (23) being located on the inner wall of the outer cylinder (21), the second limit ring (24) being riveted with the inner piston (40).

6. A solenoid valve according to claim 2, characterised in that the inner piston (40) has an inner balancing hole (44) and the outer piston (20) has an outer balancing hole (25), the cavity of the receiving chamber on the side of the piston part facing away from the outlet (12) communicating with the inner balancing hole (44), the inner balancing hole (44) communicating with the outer balancing hole (25), the outer balancing hole (25) communicating with the inlet (11).

7. A solenoid valve according to claim 6 characterised in that the inner piston (40) has a first annular groove (45) provided around the outer wall of the inner piston (40), the inner balance hole (44) and the outer balance hole (25) both communicating with the first annular groove (45).

8. The solenoid valve of claim 2 wherein said inner piston structure further comprises:

the second sealing gasket (33) is arranged at one end, far away from the outlet (12), of the inner piston (40), the second sealing gasket (33) is provided with a valve guide opening (34), the valve guide opening (34) is communicated with a through hole of the inner piston (40), and the through hole of the inner piston (40) is communicated with the outlet (12).

9. The solenoid valve of claim 1 wherein the outer piston (20) has a second annular groove (26) disposed around an outer wall of the outer piston (20), the piston assembly further comprising:

the elastic ring (35) is arranged in the second annular groove (26), a gap is formed in the side wall of the elastic ring (35), and the radial section of the elastic ring (35) is rectangular;

and the sealing ring (36) is arranged in the second annular groove (26), the inner wall of the sealing ring (36) is abutted to the outer wall of the elastic ring (35), and the outer wall of the sealing ring (36) is abutted to the inner wall of the accommodating cavity.

10. A solenoid valve according to claim 1 wherein the valve body member (10) comprises a valve seat member (13) and a valve cover member (14) connected to each other, the receiving chamber, the inlet (11) and the outlet (12) each being located in the valve seat member (13), the solenoid valve further comprising a needle member (50), the needle member (50) being movably arranged in the valve cover member (14), the needle member (50) cooperating with the piston member.