Pressure reducing valve

Abstract

The application belongs to the field of valve devices, and specifically discloses a pressure reducing valve, which comprises a valve shell, a magnetic steel assembly and a valve disc. The valve disc opens or closes the pressure reducing valve through axial movement. The valve shell is provided with a pressure regulating cavity. The valve disc divides the pressure regulating cavity into pressure regulating zones on one side and the other side. The magnetic steel assembly is installed in the pressure regulating zones along the axial direction of the valve disc. The magnetic steel assembly comprises a first magnet and a second magnet. The first magnet is installed on the opposite side of the second magnet in a same-pole repulsion manner. The second magnet is fixedly installed on the valve disc. Through the application, the technical problem that the pressure reducing valve is prone to vibration noise during work due to the compression spring and the service life of the pressure reducing valve is affected due to the wear and fatigue of the spring is solved.

Description

Technical Field

[0001] This application belongs to the field of valve technology, specifically relating to a pressure reducing valve. Background Technology

[0002] The operation of a piston-type pressure reducing valve is controlled by the downstream pressure. When the downstream pressure increases, the valve opening decreases; when the downstream pressure decreases, the valve opening increases to meet the control requirements.

[0003] Currently, pressure reducing valves on the market primarily reduce medium pressure through throttling and regulation of the opening and closing mechanism. The outlet pressure is then directly controlled by the medium pressure to automatically meet the required pressure, dynamically balancing the sum of the inlet pressure and the reset elastic force with the outlet pressure. Throughout this process, the opening and closing mechanism is constantly adjusting. Under operating conditions, when the outlet pressure decreases and falls below the set pressure, the opening of the opening and closing mechanism gradually increases; when the outlet pressure rises towards the set pressure, the opening gradually decreases until it closes. However, existing technologies primarily use mechanical compression springs to provide the reset elastic force. Due to their stiffness, natural frequency, and contact friction issues, mechanical compression springs are prone to vibration and noise during operation. Furthermore, the compression spring is constantly in a compression-recovery cycle during the dynamic operation of the pressure reducing valve, easily leading to wear and fatigue, thus affecting the valve's service life. Summary of the Invention

[0004] In view of the deficiencies or improvement needs of the prior art, this application provides a pressure reducing valve, which aims to solve the technical problems in the prior art where the compression spring causes the pressure reducing valve to easily generate vibration noise during operation, and the wear and fatigue of the spring affects the service life of the pressure reducing valve.

[0005] This application provides a pressure reducing valve, which includes a valve body, a magnet assembly, and a valve disc. The valve disc opens or closes the pressure reducing valve by axial movement. The valve body has a pressure regulating chamber, and the valve disc divides the pressure regulating chamber into pressure regulating areas on one side and the other side. The magnet assembly is installed in the pressure regulating area along the axial direction of the valve disc. The magnet assembly includes a first magnet and a second magnet. The first magnet is installed on the opposite side of the second magnet in a repulsive manner with like poles. The second magnet is fixedly installed on the valve disc.

[0006] As a further preferred embodiment, the valve housing includes a valve body and a valve cover. The top of the valve body is provided with an assembly port, and the valve cover is detachably fixed to the assembly port. The space covered by the valve body and the valve cover forms a pressure regulating chamber. An inlet and an outlet are formed on both sides of the valve body, respectively. The inlet and the outlet are respectively connected to the water passage area. The first magnet is fixed to the valve cover.

[0007] As a further preferred embodiment, the valve cover includes a cover body and a cylindrical portion, the cylindrical portion being formed on the cover body and extending away from the valve body, the first magnet being disposed inside the cylindrical portion, and the position of the first magnet on the axis of the cylindrical portion being adjustable.

[0008] As a further preferred embodiment, a connector is movably mounted on the inner side of the cylindrical portion, the position of the connector on the axis of the cylindrical portion is adjustable, and the first magnet is mounted on the connector.

[0009] As a further preferred embodiment, the connector includes an adjusting screw, which includes a head and a rod, both of which are formed with external threads. The first magnet has an annular structure, and both the inner side of the first magnet and the inner side of the cylindrical portion are formed with internal threads. The head is connected to the inner side of the cylindrical portion, and the rod is connected to the inner side of the first magnet.

[0010] As a further preferred embodiment, the upper end of the cylindrical portion is formed with a mounting hole, and a cap is detachably mounted on the mounting hole.

[0011] As a further preferred embodiment, the pressure reducing valve further includes a sleeve bracket, which is installed in the pressure regulating chamber. The side of the sleeve bracket has a water passage hole communicating with the inlet, and the bottom of the sleeve bracket has a water outlet hole communicating with the water passage hole. The valve disc is slidably disposed on the sleeve bracket.

[0012] As a further preferred embodiment, the valve disc includes a valve disc body, an internal fixing bolt, and a sealing seat. The valve disc body is slidably connected to the inner wall of the sleeve bracket. The lower part of the valve disc body passes through the water outlet hole. The internal fixing bolt passes through the valve disc body axially. The sealing seat is connected to the bottom of the internal fixing bolt for opening or closing the water outlet hole. The second magnet is fixed to the top of the valve disc body.

[0013] As a further preferred embodiment, the top of the valve disc body is provided with a mounting groove, the second magnet is an annular structure, the inner wall of the mounting groove and the outer wall of the second magnet are interference-fitted, and the inner wall of the second magnet is interference-fitted with the top of the internal fixing bolt.

[0014] As a further preferred embodiment, the valve disc body includes a first boss, a second boss, and a connecting section connected sequentially from top to bottom. The diameter of the second boss is larger than the diameter of the connecting section and smaller than the diameter of the first boss. The stepped surface between the first boss and the second boss is the pressure acting surface after the valve, and the stepped surface between the second boss and the connecting section is the pressure acting surface before the valve. The inner wall of the sleeve support is provided with a step, and the pressure acting surface after the valve is provided corresponding to the step. The connecting section passes through the water outlet and forms an annular gap between it and the wall of the water outlet for fluid to pass through. The sleeve support is provided with a plurality of water guide holes extending along its axial direction. The upper end of the water guide hole extends to the stepped surface of the step, and the lower end of the water guide hole extends to the bottom of the sleeve support.

[0015] In summary, compared with the prior art, the technical solutions conceived in this application have the following main technical advantages: 1. This application replaces the mechanical spring in a traditional pressure reducing valve with a magnetic steel assembly. A second magnet is set on the valve disc, and the first and second magnets are arranged with the same pole facing each other. The valve disc is controlled by the repulsive force between the first and second magnets with the same pole facing each other. This realizes the function of the mechanical spring and avoids the mechanical vibration and noise problems of the traditional mechanical spring. Since the two magnets do not contact each other, the performance degradation caused by long-term wear and fatigue of the spring can be eliminated at the same time, which significantly improves the service life and operational stability of the pressure reducing valve.

[0016] 2. The adjustable position of the first magnet on the axis of the cylindrical part allows for dynamic adjustment of the magnetic force to adapt to different working conditions and pressure requirements, enhancing the adjustment flexibility and accuracy of the pressure reducing valve, while simplifying the magnet position calibration operation during maintenance.

[0017] 3. A removable cap is provided through the mounting hole at the upper end of the cylindrical part, which protects the internal adjusting screw and the first magnet from external impurities, and facilitates regular inspection or replacement of the magnet assembly, thereby extending the overall maintenance cycle of the pressure reducing valve and reducing the risk of failure.

[0018] 4. Tight fixation is achieved by the interference fit between the second magnet and the valve disc body and the internal fixing bolts, which prevents the second magnet from shifting or loosening due to the movement of the valve plate, ensuring the reliability of the magnetic force, simplifying the assembly process, and improving the overall durability of the structure.

[0019] 5. By equipping the valve body with a removable plug near the outlet, it is convenient for users to clean internal deposits or perform regular maintenance, avoiding the impact of impurities on the performance of the pressure reducing valve, and reserving an interface for possible future expansion functions (such as pressure sensor installation). Attached Figure Description

[0020] Figure 1This is a three-dimensional cross-sectional schematic diagram of a pressure reducing valve provided in an embodiment of this application; Figure 2 This is a three-dimensional structural diagram of the valve body in a pressure reducing valve provided in an embodiment of this application; Figure 3 This is a three-dimensional structural diagram of the valve cover in a pressure reducing valve provided in an embodiment of this application; Figure 4 This is a three-dimensional cross-sectional schematic diagram of the valve disc body in a pressure reducing valve provided in an embodiment of this application; Figure 5 This is a three-dimensional cross-sectional schematic diagram of a sleeve bracket in a pressure reducing valve provided in an embodiment of this application; Figure 6 This is a schematic diagram of the connection between the connector and the first magnet in a pressure reducing valve provided in an embodiment of this application.

[0021] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 100. Valve housing; 10. Valve body; 10a. Inlet; 10b. Outlet; 10c. Pressure regulating chamber; 10d. Assembly hole; 10e. Plug; 11. Plug; c1. Water passage area; c2. Pressure regulating area; 20. Valve cover; 21. Cover body; 22. Cylindrical part; 22a. Mounting hole; 23. Connector; 231. Head; 232. Stem; 24. Cap; 30. Opening and closing assembly; 31. Sleeve bracket; 31a. Water passage hole; 31b. Water outlet hole; 31c. Water guide hole; 31d. Step; 32. Valve disc; 321. Valve disc body; 321a. Mounting groove; 3211. First boss; 3212. Second boss; 3213. Connecting section; 321b. Pressure action surface after valve; 321c. Pressure action surface before valve; 322. Internal fixing bolt; 323. Sealing seat; 33. First magnet; 34. Second magnet. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0023] This application provides a pressure reducing valve, such as... Figure 1 As shown, it includes a valve housing 100, a magnet assembly, and a valve disc 32.

[0024] The valve disc 32 opens or closes the pressure reducing valve by axial movement. The valve housing 100 has a pressure regulating chamber 10c, which is divided by the valve disc 32 into a water-passing area c1 on one side and a pressure regulating area c2 on the other side. Specifically, for example... Figure 2As shown, the valve housing 100 includes a valve body 10 and a valve cover 20. The top of the valve body 10 is provided with an assembly port 10d. The valve cover 20 is detachably fixed to the assembly port 10d. The space covered by the valve body 10 and the valve cover 20 forms a pressure regulating chamber 10c. An inlet 10a and an outlet 10b are formed on both sides of the valve body 10, respectively. The inlet 10a and the outlet 10b are respectively connected to the water passage area c1. Specifically, the valve cover 20 is threadedly connected to the assembly hole 10d.

[0025] The magnet assembly is located in the pressure regulating zone c2 and includes a first magnet 33 and a second magnet 34. The first magnet 33 is installed on the opposite side of the second magnet 34 with like poles repelling each other. The second magnet 34 is fixedly installed on the valve disc 32. In this embodiment, the first magnet 33 is disposed on the valve cover 20, thereby forming the first magnet 33 and the second magnet 34 with like poles facing each other.

[0026] As a preferred embodiment of this application, the pressure reducing valve includes a sleeve bracket 31, which is installed in the pressure regulating chamber 10c. Specifically, the sleeve bracket 31 is fixed in the pressure regulating chamber 10c by the cooperation of the valve cover 20 and the assembly hole 10d; the valve disc 32 is slidably disposed on the sleeve bracket 31.

[0027] Combination Figure 5 As shown, the sleeve support 31 has a water passage hole 31a on its side that communicates with the inlet 10a, and a water outlet hole 31b on its bottom that communicates with the water passage hole 31a.

[0028] Specifically, such as Figure 3 As shown, the valve cover 20 includes a cover body 21 and a cylindrical portion 22. The cylindrical portion 22 is formed on the cover body 21 and extends away from the valve body 10. A first magnet 33 is disposed inside the cylindrical portion 22, and the position of the first magnet 33 on the axis of the cylindrical portion 22 is adjustable. This adjustable position of the first magnet 33 on the axis of the cylindrical portion 22 allows for dynamic adjustment of the magnetic force to adapt to different operating pressure requirements, enhancing the adjustment flexibility and accuracy of the pressure reducing valve, while simplifying the magnet position calibration operation during maintenance.

[0029] The position of the first magnet 33 on the axis of the cylindrical part 22 is adjustable, preferably in the following manner: a connector 23 is movably installed on the inner side of the cylindrical part 22, the position of the connector 23 on the axis of the cylindrical part 22 is adjustable, and the first magnet 33 is installed on the connector 23.

[0030] Specifically, in this embodiment, the connector 23 includes an adjusting screw, such as... Figure 6As shown, the adjusting screw includes a head 231 and a rod 232, both of which have external threads. The first magnet 33 has a ring-shaped structure, and both the inner side of the first magnet 33 and the inner side of the cylindrical portion 22 have internal threads. The head 231 is connected to the inner side of the cylindrical portion 22, and the rod 232 is connected to the inner side of the first magnet 33. Using the adjusting screw with internal and external threads as the connecting part 23, the axial position of the first magnet 33 can be precisely controlled by rotating the screw, thereby achieving fine adjustment of the magnetic force and improving the response sensitivity of the pressure reducing valve to pressure fluctuations.

[0031] The upper end of the cylindrical part 22 has a mounting hole 22a, and a cap 24 is detachably mounted on the mounting hole 22a. The mounting hole 22a at the upper end of the cylindrical part 22 is equipped with a detachable cap 24, which not only protects the internal adjusting screw and the first magnet 33 from external impurities, but also facilitates regular inspection or replacement of the magnet assembly, extends the overall maintenance cycle of the pressure reducing valve and reduces the risk of failure.

[0032] In this embodiment, the valve disc 32 includes a valve disc body 321, an inner fixing bolt 322, and a sealing seat 323. The valve disc body 321 is slidably connected to the inner wall of the sleeve bracket 31. The lower part of the valve disc body 321 passes through the water outlet hole 31b. The inner fixing bolt 322 passes through the valve disc body 321 axially. The sealing seat 323 is connected to the bottom of the inner fixing bolt 322 to open or close the water outlet hole 31b. The second magnet 34 is fixed to the top of the valve disc body 321. The second magnet 34 is fixed to the top of the valve disc body 321 to ensure the stability of the magnetic force application point. The separate sealing seat 323 design reduces the impact of wear on sealing performance and extends the life of key components.

[0033] Preferably, the top of the valve disc body 321 has a mounting groove 321a, and the second magnet 34 has an annular structure. The inner wall of the mounting groove 321a and the outer wall of the second magnet 34 are interference-fitted, and the inner wall of the second magnet 34 is interference-fitted with the top of the inner fixing bolt 322. The interference fit between the second magnet 34 and the valve disc body 321 and the inner fixing bolt 322 achieves tight fixation, preventing the second magnet 34 from shifting or loosening due to valve plate movement, ensuring the reliability of the magnetic force, simplifying the assembly process, and improving the overall durability of the structure.

[0034] In this embodiment, the valve disc body 321 is a cylindrical multi-protrusion structure, specifically including a first protrusion 3211, a second protrusion 3212, and a connecting section 3213 connected sequentially from top to bottom. The diameter of the second protrusion 3212 is larger than the diameter of the connecting section 3213 and smaller than the diameter of the first protrusion 3211. The stepped surface between the first protrusion 3211 and the second protrusion 3212 is the valve downstream pressure action surface 321b, and the stepped surface between the second protrusion 3212 and the connecting section 3213 is the valve upstream pressure action surface 321c. The inner sidewall of the sleeve bracket 31 is provided with a step 31d, and the valve downstream pressure action surface 321b is provided corresponding to the step 31d. The connecting section 3213 passes through the water outlet 31b and forms an annular gap between it and the wall of the water outlet 31b for fluid to pass through. After the water enters through the water passage 31a on the periphery of the sleeve support 31, it flows out through the annular gap between the connecting section 3213 and the wall of the outlet 31b, and finally flows through the pressure reducing valve at the outlet 10b. The above structural design optimizes the pressure transmission path and, combined with the annular gap between the connecting section 3213 and the outlet 31b, achieves more precise flow control and pressure balance. The pressure action surface 321b after the valve is set to correspond to the step 31d. The step 31d can limit the movement of the valve disc body 321. When the valve disc body 321 moves downward to the maximum opening, the pressure action surface 321b after the valve abuts against the step 31d. At this time, the valve disc body 321 reaches the limit position of movement.

[0035] More preferably, the sleeve support 31 is provided with a plurality of water guide holes 31c extending along its axial direction. The upper end of the water guide hole 31c extends to the step surface of the step, and the lower end of the water guide hole 31c extends to the bottom of the sleeve support 31. The water guide hole 31c on the sleeve support 31 guides the outlet side pressure to the valve post-pressure action surface 321b above the valve disc 32, which helps to achieve dynamic balance of the upper and lower pressures of the valve disc 32, reduces local turbulence and impact vibration, helps to reduce operating noise and improve the smoothness of opening and closing action, and ensures stable flow regulation and rapid response.

[0036] Understandably, in order to ensure sealing, sealing rings are provided between the first boss 3211 and the sleeve bracket 31, between the second boss 3212 and the sleeve bracket 31, and between the sleeve bracket 31 and the side wall of the pressure regulating chamber 10c.

[0037] A plug 10e is formed on the side wall of the valve body 10, and a plug 11 is detachably installed on the plug 10e. The plug 10e is located at the end of the valve body 10 near the outlet 10b. By equipping the plug 10e of the valve body 10 near the outlet 10b with a detachable plug 11, it is convenient for users to clean internal deposits or perform regular maintenance, so as to avoid the performance of the pressure reducing valve being affected by impurities. At the same time, it reserves an interface for possible future expansion functions (such as pressure sensor installation).

[0038] The pressure regulation in this embodiment is as follows: The valve disc 32 operates under the combined action of fluid pressure and magnetic force. The sealing seat 323 at the bottom of the valve disc 32 controls the opening degree of the outlet hole 31b. The second magnet 34 at the top of the valve disc 32 and the first magnet 33 on the valve cover 20, whose position is axially adjustable, generate a repulsive force due to their like poles opposing each other. This magnetic force is equivalent to a preset reference pressure. By rotating the adjusting screw (connector 23) to change the position of the first magnet 33, the magnitude of the magnetic force can be adjusted, thereby setting the target pressure value at the outlet 10b.

[0039] The working process of this application embodiment is as follows: During operation, when outlet 10b is closed, the pressure at outlet 10b will continue to increase. When the fluid pressure acting on valve disc 32 exceeds the magnetic force, it will continuously push valve disc 32 to move upward, causing sealing seat 323 to reduce the opening of water outlet 31b until it is closed. When outlet 10b flows normally at a certain flow rate, sealing seat 323 maintains a certain opening degree to outlet hole 31b. At this time, the sum of inlet pressure and magnetic force forms a dynamic balance with outlet pressure. If the water flow rate at outlet 10b is increased, the pressure at outlet 10b will decrease, breaking the dynamic balance. The magnetic force pushes valve disc 32 downward, causing sealing seat 323 to increase the opening of water outlet 31b, thereby increasing the water flow rate of the pressure reducing valve. At this time, the magnetic force decreases due to the increased spacing between the magnets, until the sum of the inlet pressure and the magnetic force forms a new dynamic balance with the outlet pressure. Conversely, if the water flow rate at outlet 10b is decreased, the pressure at outlet 10b will increase, breaking the dynamic balance. The magnetic force pushes valve disc 32 upward, causing sealing seat 323 to decrease the opening of water outlet 31b, thereby reducing the water flow rate of the pressure reducing valve. At this time, the magnetic force increases due to the decreased spacing between the magnets, until the sum of the inlet pressure and the magnetic force forms a new dynamic balance with the outlet pressure.

[0040] In summary, this application achieves valve control through the repulsive force between the first magnet 33 and the second magnet 34 with the same poles facing each other. This achieves the function of a mechanical spring while avoiding the mechanical vibration and noise problems of traditional mechanical springs. Since the two magnets do not contact each other, the performance degradation of the spring caused by long-term wear and fatigue can be eliminated at the same time, which significantly improves the service life and operational stability of the pressure reducing valve.

[0041] It should be understood that expressions such as "comprising" and "may include" as used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "comprising" and / or "having" may be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or combination thereof, but should not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0042] It should be understood that the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0044] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pressure reducing valve, characterized in that, The valve includes a valve housing (100), a magnet assembly, and a valve disc (32). The valve disc (32) opens or closes the pressure reducing valve by axial movement. The valve housing (100) has a pressure regulating chamber (10c). The valve disc (32) divides the pressure regulating chamber (10c) into a water passage area (c1) on one side and a pressure regulating area (c2) on the other side. The magnet assembly is installed in the pressure regulating area (c2) along the axial direction of the valve disc. The magnet assembly includes a first magnet (33) and a second magnet (34). The first magnet (33) is installed on the opposite side of the second magnet (34) in a repulsive manner. The second magnet (34) is fixedly installed on the valve disc (32).

2. The pressure reducing valve according to claim 1, characterized in that, The valve housing (100) includes a valve body (10) and a valve cover (20). The valve body (10) has an assembly port (10d) on its top. The valve cover (20) is detachably fixed to the assembly port (10d). The space covered by the valve body (10) and the valve cover (20) forms a pressure regulating chamber (10c). An inlet (10a) and an outlet (10b) are formed on both sides of the valve body (10). The inlet (10a) and the outlet (10b) are respectively connected to the water passage area (c1). The first magnet (33) is fixed to the valve cover.

3. The pressure reducing valve according to claim 2, characterized in that, The valve cover (20) includes a cover body (21) and a cylindrical portion (22), the cylindrical portion (22) being formed on the cover body (21) and extending away from the valve body (10), the first magnet (33) being disposed inside the cylindrical portion (22), and the position of the first magnet (33) on the axis of the cylindrical portion (22) being adjustable.

4. The pressure reducing valve according to claim 3, characterized in that, A connector (23) is movably installed on the inner side of the cylindrical part (22). The position of the connector (23) on the axis of the cylindrical part (22) is adjustable. The first magnet (33) is installed on the connector (23).

5. The pressure reducing valve according to claim 4, characterized in that, The connector (23) includes an adjusting screw, which includes a head (231) and a rod (232) both having external threads. The first magnet (33) has an annular structure. Both the inner side of the first magnet (33) and the inner side of the cylindrical part (22) have internal threads. The head (231) is connected to the inner side of the cylindrical part (22), and the rod (232) is connected to the inner side of the first magnet (33).

6. The pressure reducing valve according to claim 3, characterized in that, The upper end of the cylindrical part (22) is formed with a mounting hole (22a), and a cap (24) is detachably mounted on the mounting hole (22a).

7. The pressure reducing valve according to claim 2, characterized in that, The pressure reducing valve also includes a sleeve bracket (31), which is installed in the pressure regulating chamber (10c). The side of the sleeve bracket (31) is provided with a water passage hole (31a) communicating with the inlet (10a), and the bottom of the sleeve bracket (31) is provided with a water outlet hole (31b) communicating with the water passage hole (31a). The valve disc (32) is slidably disposed on the sleeve bracket (31).

8. The pressure reducing valve according to claim 7, characterized in that, The valve disc (32) includes a valve disc body (321), an inner fixing bolt (322), and a sealing seat (323). The valve disc body (321) is slidably connected to the inner wall of the sleeve bracket (31). The lower part of the valve disc body (321) passes through the water outlet (31b). The inner fixing bolt (322) passes through the valve disc body (321) axially. The sealing seat (323) is connected to the bottom of the inner fixing bolt (322) for opening or closing the water outlet (31b). The second magnet (34) is fixed to the top of the valve disc body (321).

9. The pressure reducing valve according to claim 8, characterized in that, The valve body (321) has an installation groove (321a) on its top. The second magnet (34) is an annular structure. The inner wall of the installation groove (321a) and the outer wall of the second magnet (34) are interference-fitted. The inner wall of the second magnet (34) is interference-fitted with the top of the inner fixing bolt (322).

10. The pressure reducing valve according to claim 8, characterized in that, The valve disc body (321) includes a first boss (3211), a second boss (3212), and a connecting section (3213) connected sequentially from top to bottom. The diameter of the second boss (3212) is larger than the diameter of the connecting section (3213) and smaller than the diameter of the first boss (3211). The stepped surface between the first boss (3211) and the second boss (3212) is the downstream pressure action surface (321b), and the stepped surface between the second boss (3212) and the connecting section (3213) is the upstream pressure action surface (321c). The inner wall of the sleeve support (31) is provided with a step (31d), and the pressure action surface (321b) after the valve is provided corresponding to the step (31d); the connecting section (3213) passes through the water outlet (31b) and forms an annular gap between it and the wall of the water outlet (31b) for fluid to pass through; the sleeve support (31) is provided with a plurality of water guide holes (31c) extending along its axial direction; the upper end of the water guide hole (31c) extends to the step surface of the step (31d), and the lower end of the water guide hole (31c) extends to the bottom of the sleeve support (31).

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