Valve structure

Abstract

The utility model provides a valve structure. The valve structure comprises a valve element assembly, a valve pipe and a connector. The valve pipe is provided with a valve cavity penetrating in the axial direction of the valve pipe, and a valve element assembly is installed in the valve cavity. At least one end of the valve pipe in the axial direction of the valve pipe is arranged to be a straight section. The connector is connected to the straight section and is communicated with the valve cavity; the inner diameter of the connector is smaller than that of the valve pipe. The diameter of the valve pipe opening formed by the straight section is consistent with the diameter of the valve cavity, impurities generated in the machining process can be easily cleaned, the structures of the valve element assembly and the like are protected, the product performance is ensured, the machining technology is simple, and the production efficiency can be improved easily. The inner diameter of the connector is smaller than the inner diameter of the valve pipe, so that the inner space of the connector is smaller than the space of the valve cavity to adapt to the actual circulation amount of the valve pipe, the fluid flow can be kept stable, and the requirement for the fluid circulation amount is met.

Description

Technical Field

[0001] This application relates to the technical field of valves, and particularly to a valve structure. Background Art

[0002] A check valve is a valve used to control the flow direction of a fluid, allowing the fluid to flow freely in one direction while preventing the fluid from flowing in the opposite direction. Existing check valves generally include a valve tube and a valve core assembly, and the valve core assembly is placed inside the valve tube. In related technologies, since the valve core assembly occupies the internal space of the valve tube, which affects the flow rate output by the valve tube. To ensure that the internal flow rate of the valve tube is consistent with the pipeline flow rate, the structure at the valve tube orifice is generally set as a reduced orifice structure. However, the processing of the finished product's reduced orifice generally requires processing the inner diameter of the orifice and the flat end face. During the processing, impurities such as metal chips are likely to enter the valve body and are not easy to clean thoroughly, affecting the product cleanliness, and easily causing the valve core assembly to be damaged by impurities, resulting in an increased internal leakage of the check valve and affecting the product performance. In addition, the spinning method is usually adopted during the reduced orifice processing, the processing technology is relatively complex, prone to cracking, and affects the production efficiency of the valve structure. Summary of the Utility Model

[0003] Based on this, in view of the above technical problems, it is necessary to provide a valve structure that can ensure the product performance and stable fluid flow rate while realizing simple processing, convenient cleaning, and improving production efficiency.

[0004] The valve structure includes a valve core assembly, a valve tube, and a connector; the valve tube is configured with a valve cavity that penetrates along its own axis, and the valve core assembly is installed in the valve cavity; at least one end of the valve tube along its own axis is set as a straight section; the connector is connected to the straight section and communicates with the valve cavity; the inner diameter of the connector is smaller than the inner diameter of the valve tube.

[0005] It can be understood that the end of the valve tube is set as a straight section, and the diameter of the valve tube orifice formed by the straight section is the same as the diameter of the valve cavity, which is easy to clean the impurities generated during processing to protect the structure such as the valve core assembly, ensure the product performance, and the processing technology is simple, which is beneficial to improving the production efficiency. The straight section and the connector can be directly connected to facilitate the connection of the valve tube to the external pipeline through the connector. Since there is a valve core assembly inside the valve tube occupying the space of the valve tube, the actual flow rate of the valve tube is less than the theoretical flow rate of the valve tube. By designing the inner diameter of the connector to be smaller than the inner diameter of the valve tube, the internal space of the connector is smaller than the space of the valve cavity to adapt to the actual flow rate of the valve tube, thereby promoting the fluid to flow smoothly from the valve tube to the connector and maintaining a stable fluid flow rate, which is beneficial to meeting the requirements of the fluid flow rate.

[0006] In one embodiment, the inner diameter of the connector is d, and the inner diameter of the straight section is D, and d = (60% - 80%)D.

[0007] It is understandable that such a setting is to ensure that the flow rate of the connector can adapt to the actual flow rate of the valve pipe, so that the fluid output from the connector can meet the requirements of the fluid flow rate and pressure required for the work.

[0008] In one embodiment, the connector is inserted and cooperated with the straight section, and the connector is configured with a limiting portion for abutting against the straight section.

[0009] It is understandable that the way of inserting and cooperating is simple to operate. By setting the limiting portion to limit the cooperation length of the two, it is beneficial to realize rapid assembly and positioning.

[0010] In one embodiment, the connector is inserted into the straight section; the limiting portion protrudes outward from the outer side wall of the connector along the radial direction of the connector, and the end face of the limiting portion facing the valve pipe abuts against the straight section.

[0011] It is understandable that in the case where the connector is inserted into the straight section, the limiting portion protrudes from the outer side wall of the connector, and the structure is simple and easy to produce and process.

[0012] In one embodiment, the limiting portion is recessed from the end face of the connector facing the valve pipe along the axial direction of the connector to form a limiting groove, the straight section is inserted into the limiting groove, and the bottom of the limiting groove abuts against the straight section.

[0013] It is understandable that the structure in which the limiting portion is recessed to form a limiting groove is used to cooperate with the straight section, and has a limiting effect on the straight section both radially and axially, and the structure is simple and easy to process.

[0014] In one embodiment, the straight section is inserted into the connector; the limiting portion protrudes inward from the inner side wall of the connector along the radial direction of the connector, and along the axial direction of the connector, the end face of the limiting portion facing the valve pipe abuts against the straight section.

[0015] It is understandable that in the case where the straight section is inserted into the connector, the limiting portion protrudes from the inner side wall of the connector, and the structure is simple and easy to produce and process.

[0016] In one embodiment, the outer diameter of the connector at the position of the limiting portion is b, and the outer diameter of the structure of the connector connected to the limiting portion and away from the valve pipe is a, and a = (65% - 85%)b.

[0017] It is understandable that such a setting is to enhance the thickness of the limiting portion, improve the structural strength at the position of the limiting portion, and reduce the thickness of other structures of the connecting portion to save materials.

[0018] In one embodiment, a drainage portion is formed on the inner side wall of the connector near the valve cavity side. Along the axial direction of the connector, the drainage portion is arranged to gradually expand from the connector towards the valve cavity.

[0019] It can be understood that the gradually expanding arrangement of the drainage portion forms a drainage inclined surface to guide the fluid to flow along the inclined surface, improving the smoothness of fluid flow.

[0020] In one embodiment, the included angle between the side wall of the drainage portion and the axis of the connector is α, and 30° ≤ α ≤ 60°.

[0021] It can be understood that such an arrangement can make the side wall of the drainage portion fully inclined, ensuring the drainage effect and avoiding excessive inclination angles that may affect the structural strength.

[0022] In one embodiment, the valve core assembly includes a valve seat, a magnetic member, a valve core, and a bracket. The magnetic member is installed in the valve seat, and the valve seat is provided with a flow hole. The magnetic member is spaced from the flow hole. Along the axial direction of the valve tube, a bracket is connected to the side of the valve seat away from the magnetic member. An active space communicating with the valve cavity is formed between the bracket and the valve seat, and the valve core is located in the active space. The valve core is configured to approach or move away from the magnetic member in response to the comparison of the adsorption force of the magnetic member and the magnitude of the fluid pressure, so as to close or open the flow hole.

[0023] It can be understood that controlling the one-way flow of the fluid through the adsorption cooperation of the magnetic member on the valve core is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a cross-sectional view of the first embodiment of the valve structure provided by the present application;

[0026] Figure 2 It is a cross-sectional view of the second embodiment of the valve structure provided by the present application;

[0027] Figure 3 It is a cross-sectional view of the third embodiment of the valve structure provided by the present application.

[0028] Explanation of the reference numerals in the accompanying drawings: 100, valve structure; 10, valve core assembly; 101, movable space; 11, magnetic part; 12, valve core; 13, valve seat; 131, flow hole; 14, bracket; 20, valve tube; 201, valve cavity; 202, straight section; 21, first pipe section; 22, second pipe section; 30, connector; 31, limiting portion; 311, limiting groove; 32, drainage portion; 40, filter assembly; 41, filter bracket; 42, filter net. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0031] In this document, spatially related terms such as "upper" and "lower" are defined with reference to the accompanying drawings. Therefore, it will be understood that "upper" and "lower" are used interchangeably. It will be understood that when a layer is referred to as being "on" another layer, it can be directly formed on the other layer, or intervening layers may also be present. Therefore, it will be understood that when a layer is referred to as being "directly on" another layer, there are no intervening layers interposed therebetween.

[0032] In the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity. It is understood that when a layer or element is referred to as being "on" another layer or substrate, the layer or element may be directly on the other layer or substrate, or there may be intervening layers. In addition, it is also understood that when a layer is referred to as being "between" two layers, the layer may be the only layer between the two layers, or there may be one or more intervening layers. In addition, the same reference numerals always represent the same elements.

[0033] In the following text, although terms such as "first", "second", etc. may be used to describe various components, these components do not necessarily have to be limited to the above terms. The above terms are only used to distinguish one component from another. It will also be understood that expressions used in the singular form include the plural form, unless the singular form has a clearly different meaning in the context. In addition, in the following embodiments, it will also be understood that the terms "comprising" and / or "having" used herein indicate the presence of the stated features or components, but do not exclude the presence or addition of one or more other features or components.

[0034] In the following embodiments, when a layer, region, or element is "connected", it can be interpreted that the layer, region, or element is not only directly connected but also connected through other constituent elements disposed therebetween. For example, when a layer, region, element, etc. is described as being connected or electrically connected, the layer, region, element, etc. can not only be directly connected or directly electrically connected, but also be connected or electrically connected through another layer, region, element, etc. disposed therebetween.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0036] It should also be understood that terms such as "including / comprising" or "having", etc. specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0037] Please refer to Figures 1 to 3 , this application provides a valve structure 100. The valve structure 100 includes a valve core assembly 10, a valve tube 20, and a connector 30. The valve tube 20 is configured with a valve cavity 201 that penetrates along its own axis. The valve core assembly 10 is installed in the valve cavity 201. The valve cavity 201 provides sufficient space for fluid flow and the installation of the valve core assembly 10. The valve core assembly 10 can control the one-way flow of fluid.

[0038] In a specific embodiment, the valve core assembly 10 includes a magnetic member 11, a valve core 12, a valve seat 13, and a bracket 14. The magnetic member 11 is installed on the valve seat 13. The valve seat 13 is configured with a flow hole 131, and the magnetic member 11 is spaced from the flow hole 131. Along the axial direction of the valve tube 20, a bracket 14 is connected to the side of the valve seat 13 away from the magnetic member 11. An activity space 101 communicating with the valve cavity 201 is formed between the bracket 14 and the valve seat 13, and the valve core 12 is located in the activity space 101. The valve core 12 is configured to approach or move away from the magnetic member 11 in response to the comparison of the adsorption force of the magnetic member 11 and the fluid pressure, so as to close or open the flow hole 131. Exemplarily, the material of the valve core 12 can be a magnetic metal or a metal composite.

[0039] In actual application, along the axial direction of the valve tube 20, the fluid flows from the magnetic member 11 towards the valve core 12. When the fluid pressure is greater than the magnetic adsorption force of the magnetic member 11 on the valve core 12, the fluid can push open the valve core 12 to flow out from the flow hole 131, realizing the circulation of the fluid. When there is no fluid or the fluid flow rate in the valve tube 20 is small, the valve core 12 can block the flow hole 131 under the magnetic adsorption of the magnetic member 11. On the contrary, along the axial direction of the valve tube 20, when the fluid flows from the valve core 12 towards the magnetic member 11, the fluid presses the valve core 12 against the magnetic member 11, and the valve core 12 tightly seals the flow hole 131, and the fluid cannot pass through.

[0040] In this way, through the cooperation of the magnetic member 11 and the valve core 12, the one-way flow control of the fluid can be automatically realized, the structure is simple, and the adsorption force of the magnetic member 11 helps the valve core 12 to reset. Among them, the bracket 14 can abut against the valve core 12, thereby restricting the moving distance of the valve core 12 relative to the magnetic member 11, so that the valve core 12 is within the adsorbable range of the magnetic member 11.

[0041] Exemplarily, the magnetic member 11 can be set as a magnet, and the valve core 12 can be set as a diaphragm. Among them, adopting the sheet-like structure of the diaphragm can increase the contact area with the fluid and is easy to be pushed by the fluid. This is only an example here.

[0042] As Figures 1 to 3 shown, in a specific embodiment, the valve structure 100 further includes a filtering component 40. Along the axial direction of the valve tube 20, the filtering component 40 is installed on the side of the magnetic member 11 away from the valve core 12 to realize the filtering effect on the fluid.

[0043] More specifically, the filtering component 40 includes a filtering bracket 41 and a filter net 42 connected to the filtering bracket 41, and the filtering bracket 41 is connected to the valve seat 13.

[0044] In some embodiments, the valve tube 20 includes a first tube section 21 and a second tube section 22. The first tube section 21 and the second tube section 22 are connected oppositely to form the valve tube 20. The valve core assembly 10 is assembled between the first tube section 21 and the second tube section 22. With this arrangement, the valve core assembly 10 can be first assembled with one of the first tube section 21 and the second tube section 22 and then connected to the other, which is simple to assemble and conducive to improving the assembly efficiency. Among them, the first tube section 21 and the second tube section 22 can be respectively connected to the valve seat 13 by welding, such as laser welding, etc. The welding connection is firm and conducive to forming a good seal, reducing the possibility of fluid leakage.

[0045] Furthermore, at least one end of the valve tube 20 along its own axis is provided as a straight section 202; the connector 30 is connected to the straight section 202 and communicates with the valve cavity 201. Among them, the structure of the straight section 202 is simple, with fewer production and processing processes and simple processing, which is conducive to improving the production efficiency of the valve tube 20 and is also simpler during connection and assembly. At the same time, after the straight section 202 is processed, the impurities at the location of the straight section 202 can be easily cleaned out of the valve cavity 201, which is convenient for cleaning and has a high cleaning efficiency, so that the impurities generated during the processing are not easily retained in the valve cavity 201 to protect the structure of the valve core assembly 10 and ensure the product performance. It should be noted that the straight section 202 here refers to the structure formed by straightening the end of the valve tube 20.

[0046] As Figures 1 to 3 shown, in some embodiments, the valve tube 20 is formed by smooth and continuous straight processing along its own axis and naturally forms a straight end, that is, the straight section 202.

[0047] As Figures 1 to 3 shown, furthermore, the inner diameter of the connector 30 is smaller than the inner diameter of the valve tube 20. With this arrangement, the space inside the connector 30 is smaller than the space inside the valve tube 20. Since structures such as the valve core assembly 10 are provided inside the valve tube 20, occupying the space of the valve cavity 201, the fluid flow rate inside the valve cavity 201 decreases. The smaller space of the connector 30 is adapted to the fluid flow rate of the valve cavity 201 to promote the smooth flow of the fluid to meet the requirements of the flow rate and pressure of the output fluid.

[0048] In summary, through the setting of the straight section 202 of the valve tube 20 and the setting that the inner diameter of the connector 30 is smaller than the inner diameter of the valve tube 20, the present application can, on the premise of ensuring stable fluid flow rate and meeting the flow rate requirements, avoid necking processing of the end of the valve tube 20 and use straight processing, making the valve tube 20 easy to clean, conducive to protecting the valve core assembly 10 from the influence of impurities, ensuring the product performance, and the structure of the straight section 202 is simple and the processing is convenient, which is conducive to improving the production efficiency and realizing mass production.

[0049] As Figures 1 to 3As shown, in a specific embodiment, the inner diameter of the connector 30 is d, and the inner diameter of the straight section 202 is D, where d = (60% - 80%)D. This setting promotes stable fluid flow and meets the requirements for the flow output of the valve structure 100. Exemplarily, d = 60%D, 70%D, or 80%D.

[0050] As Figures 1 to 3 shown, in an alternative embodiment, the connector 30 is in plug-in fit with the straight section 202. In this way, the plug-in fit method is simple to operate and convenient for assembly.

[0051] As Figures 1 to 3 shown, in a further embodiment, the connector 30 is configured with a limiting portion 31 for abutting against the straight section 202 to limit the mating length of the two, which is beneficial for quick positioning and assembly and improves the stability during connection.

[0052] In a specific embodiment, the connection between the connector 30 and the valve pipe 20 is welded to form a good seal and prevent fluid leakage. Exemplarily, welding methods such as laser welding and argon arc welding can be used, which are simple to operate, and only examples are given here.

[0053] In some embodiments, the connector 30 is made of stainless steel, which has a relatively low material price, is beneficial for reducing production costs, and has good corrosion resistance.

[0054] As Figure 1 shown, in the first embodiment, the connector 30 is inserted into the straight section 202; the limiting portion 31 protrudes radially outward from the outer sidewall of the connector 30, and the end face of the limiting portion 31 facing the valve pipe 20 abuts against the straight section 202. In this way, the limiting portion 31 is arranged outside the connector 30 to form a simple structure in this plug-in manner, which is convenient for processing, and can effectively limit the mating length of the connector 30 and the straight section 202 to promote quick assembly and positioning and is not easy to shake during welding.

[0055] As Figure 2 shown, in the second embodiment, the limiting portion 31 is recessed axially from the end face of the connector 30 facing the valve pipe 20 to form a limiting groove 311, and the straight section 202 is inserted into the limiting groove 311, and the bottom of the limiting groove 311 abuts against the straight section 202. In this way, the side wall of the limiting groove 311 has a radial limiting effect on the straight section 202, and the bottom wall of the limiting groove 311 has an axial limiting effect on the straight section 202, thereby improving the assembly stability of the straight section 202 and the connector 30.

[0056] As Figure 3As shown, in the third embodiment, the straight section 202 is inserted into the connector 30; the limiting portion 31 is formed by protruding radially inward from the inner side wall of the connector 30 along the radial direction of the connector 30. Along the axial direction of the connector 30, the end face of the limiting portion 31 facing the valve tube 20 abuts against the straight section 202. In this way, the limiting portion 31 is arranged inside the connector 30 to effectively limit the straight section 202 in this plugging manner, with a simple structure and easy to process.

[0057] As Figure 1 shown, in a specific embodiment, the outer diameter of the connector 30 at the position of the limiting portion 31 is b, and the outer diameter of the structure of the connector 30 that is connected to the limiting portion 31 and away from the valve tube 20 is a, and a = (65% - 85%)b. Since the inner diameter of the connector 30 remains unchanged, the wall thickness dimension at the limiting portion 31 is relatively large, which is beneficial to ensuring the structural strength and enhancing the structural stability at the limiting portion 31. At the same time, the outer diameter of the other structures except the limiting portion 31 is smaller, that is, the wall thickness dimension is smaller, which is beneficial to reducing material damage and reducing weight while ensuring the structural strength. Exemplarily, a = 65%b, 70%b or 85%b.

[0058] As Figures 1 to 3 shown, in an alternative embodiment, a drainage portion 32 is formed on the inner side wall of the connector 30 near the valve cavity to guide the fluid to enter the valve cavity 201 from the connector 30 or to enter the inside of the connector 30 from the valve cavity 201.

[0059] In the first embodiment and the second embodiment, the drainage portion 32 is connected to the end face of the connector 30 facing the valve cavity 201; in the third embodiment, the drainage portion 32 is connected to the limiting end face formed by the limiting portion 31.

[0060] As Figures 1 to 3 shown, further, along the axial direction of the connector 30, the drainage portion 32 is arranged to gradually expand from the connector 30 towards the valve cavity 201. In this way, the drainage portion 32 forms an inclined slope, and the fluid can flow along the slope, reducing the dead angle of fluid flow and promoting the smooth flow of the fluid.

[0061] As Figure 1 shown, in a specific embodiment, the included angle between the side wall of the drainage portion 32 and the axis of the connector 30 is α, and 30° ≤ α ≤ 60°. In this way, to ensure that the drainage portion 32 forms a properly inclined side wall for drainage, ensuring the fluid drainage effect, so that the fluid near the wall of the valve cavity 201 can be guided into the inside of the connector 30, or the fluid in the connector 30 can fully enter the valve cavity 201. Exemplarily, α = 30°, 45° or 60°.

[0062] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0063] The above-described embodiments only express several implementation manners of the present invention, and their descriptions are relatively specific and detailed. However, it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several variations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A valve structure, characterized in that, Comprising: A valve core assembly (10); A valve pipe (20) configured with a valve cavity (201) running through it along its own axis, and the valve core assembly (10) is installed in the valve cavity (201); at least one end of the valve pipe (20) along its own axis is set as a straight section (202); A connector (30) connected to the straight section (202) and communicating with the valve cavity (201); the inner diameter of the connector (30) is smaller than the inner diameter of the valve pipe (20).

2. The valve structure according to claim 1, characterized in that, The inner diameter of the connector (30) is d, and the inner diameter of the straight section (202) is D, where d = (60% - 80%)D.

3. The valve structure according to claim 1, characterized in that, The connector (30) is in plug-in fit with the straight section (202), and the connector (30) is configured with a limiting portion (31) for abutting against the straight section (202).

4. The valve structure according to claim 3, characterized in that, The connector (30) is inserted into the straight section (202); the limiting portion (31) protrudes radially outward from the outer side wall of the connector (30) along the radial direction of the connector (30), and the end face of the limiting portion (31) facing the valve pipe (20) abuts against the straight section (202).

5. The valve structure according to claim 3, characterized in that, The limiting portion (31) forms a limiting groove (311) by being recessed axially along the connector (30) from the end face of the connector (30) facing the valve pipe (20), the straight section (202) is inserted into the limiting groove (311), and the bottom of the limiting groove (311) abuts against the straight section (202).

6. The valve structure according to claim 3, characterized in that, The straight section (202) is inserted into the connector (30); The limiting portion (31) protrudes radially inward from the inner side wall of the connector (30) along the radial direction of the connector (30), and along the axial direction of the connector (30), the end face of the limiting portion (31) facing the valve pipe (20) abuts against the straight section (202).

7. The valve structure according to claim 3, wherein The outer diameter of the connector (30) at the location of the limiting portion (31) is b, and the outer diameter of the structure of the connector (30) that is connected to the limiting portion (31) and is away from the valve pipe (20) is a, where a = (65% - 85%)b.

8. The valve structure according to claim 1, wherein, The inner side wall of the connector (30) on the side close to the valve cavity (201) is configured with a drainage portion (32), and along the axial direction of the connector (30), the drainage portion (32) is gradually expanded from the connector (30) towards the valve cavity (201).

9. The valve structure according to claim 8, characterized in that, The angle between the side wall of the drainage portion (32) and the axis of the connector (30) is α, where 30° ≤ α ≤ 60°.

10. The valve structure according to any one of claims 1 to 9, characterized in that, The spool assembly (10) includes a valve seat (13), a magnetic member (11), a spool (12), and a bracket (14). The magnetic member (11) is installed on the valve seat (13). The valve seat (13) is configured with a flow passage hole (131), and the magnetic member (11) is spaced apart from the flow passage hole (131). Along the axial direction of the valve tube (20), a bracket (14) is connected to the side of the valve seat (13) away from the magnetic member (11). An active space (101) communicating with the valve cavity (201) is formed between the bracket (14) and the valve seat (13), and the spool (12) is located in the active space (101). The spool (12) is configured to approach or move away from the magnetic member (11) in response to the comparison of the adsorption force of the magnetic member (11) and the magnitude of the fluid pressure, so as to close or open the flow passage hole (131).

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