High pressure piston pressure reducing type regulating valve

Abstract

The utility model belongs to valve technical field especially high -pressure piston pressure reducing type governing valve, including valve body and sleeve, valve body is the cylinder structure, is equipped with the mounting groove in the upper end surface, is equipped with the valve cavity in the mounting groove bottom surface, is equipped with the flow channel hole in the mounting groove bottom surface, is equipped with the locating sleeve in the opening, is equipped with the limiting plate in the locating sleeve top, is equipped with the fluid valve seat, fixed sleeve and stopper in the locating sleeve, is equipped with the valve core in the fixed sleeve, is equipped with the lifting spring between the valve core and stopper, is equipped with the limiting plate in the mounting groove, is equipped with the first through -hole on the limiting plate, is equipped with the piston in the first through -hole, is equipped with the unloading valve seat in the piston bottom surface, the valve core top end and unloading valve seat abut, is equipped with the guide support plate on the piston, the sleeve is connected with valve body threadedly, is equipped with the guide plate in the sleeve, is equipped with the load spring between the guide plate and guide support plate, is equipped with the cylinder cover on the sleeve, is connected with the adjusting screw rod on the cylinder cover threadedly, one end of adjusting screw rod abuts on the guide plate, the other end is equipped with the handle, improved the stability of output pressure, also convenient for adjusting output pressure.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a high-pressure piston pressure reducing regulating valve. Background Technology

[0002] High-pressure piston pressure reducing control valves are designed for high-pressure, large-differential-pressure, and harsh operating conditions (such as hydrogen, natural gas, synthetic ammonia, urea, hydrocracking, supercritical fluids, etc.). The core of the valve lies in using a piston valve core and a unique structure to overcome the challenges brought by high pressure, achieving stable pressure reduction, precise regulation, resistance to cavitation erosion, and high reliability.

[0003] Although the piston-type pressure-reducing regulating valve currently in use can achieve a certain pressure reduction effect, its output pressure stability is poor, and it will fluctuate. Moreover, the output pressure adjustment is relatively troublesome and its adaptability is poor.

[0004] To address the aforementioned problems, this utility model document proposes a high-pressure piston pressure-reducing regulating valve. Utility Model Content

[0005] This invention provides a high-pressure piston pressure reducing regulating valve, which improves the stability of the output pressure and also facilitates the adjustment of the output pressure.

[0006] This utility model provides the following technical solution:

[0007] A high-pressure piston pressure-reducing regulating valve includes a valve body and a sleeve. The valve body has a cylindrical structure with a mounting groove on its upper end face. A valve cavity is formed in the middle of the bottom surface of the mounting groove. An inlet hole and an outlet hole are formed on the side wall of the valve body. The inlet hole communicates with the valve cavity. A flow channel hole communicating with the outlet hole is also provided on the bottom surface of the mounting groove. A positioning sleeve is threadedly connected to the opening of the valve cavity. A limiting plate is provided at the top of the positioning sleeve, and a plug is threadedly connected to the inner wall of the bottom end. A fluid valve seat is held in place by the limiting plate inside the positioning sleeve. A fixing sleeve is provided below the fluid valve seat. The top of the fixing sleeve is connected to the flow channel hole. The valve seat abuts against the blockage at its bottom end. A valve core that mates with the valve seat is slidably disposed within the fixed sleeve. A lifting spring is provided between the bottom end of the valve core and the blockage, and the top end of the valve core passes through the fluid valve seat and the limiting plate. A positioning plate is inserted into the mounting groove. A flow channel groove is opened on the adjacent surface of the positioning plate and the mounting groove, and the flow channel groove is connected to the flow channel hole. A first through hole is opened in the middle of the positioning plate. A piston is slidably disposed within the first through hole. An unloading valve seat is inserted into the bottom surface of the piston. The top end of the valve core abuts against the bottom surface of the unloading valve seat. A guide support plate is provided on the top surface of the piston.

[0008] The bottom end of the sleeve is threadedly connected to the outer wall of the top end of the valve body. A guide plate is slidably arranged inside the sleeve. A load spring is provided between the guide plate and the guide support plate. A sleeve cover is threadedly connected to the top end of the sleeve. An adjusting screw is threadedly connected to the sleeve cover. One end of the adjusting screw abuts against the guide plate, and the other end is connected to a handle.

[0009] The fluid valve seat has a second through hole, the limiting plate has a third through hole, and the plug has a fourth through hole.

[0010] Furthermore, a first vent hole is provided on the top side wall of the sleeve.

[0011] Furthermore, the positioning plate has a first air supply hole, the valve body sidewall has a second exhaust hole, the bottom surface of the mounting groove has a second air supply hole, one end of the second air supply hole is connected to the first air supply hole, and the other end is connected to the second exhaust hole.

[0012] Furthermore, the contact surface between the positioning plate and the valve body is provided with two sets of O-rings, the connection between the first air inlet and the second air inlet is located between the two sets of O-rings, the contact surface between the piston and the positioning plate is provided with O-rings, the contact surface between the unloading valve seat and the piston is provided with O-rings, the contact surface between the fluid valve seat and the positioning sleeve is provided with O-rings, and the contact surface between the guide plate and the sleeve is provided with O-rings.

[0013] Furthermore, the blockage contains a filter element, and the lifting spring abuts against the filter element.

[0014] Furthermore, the piston has a positioning block on its top surface, and the guide support plate has a positioning groove on its bottom surface that matches the positioning block.

[0015] Furthermore, the diameter of the top end of the adjusting screw is smaller than that of the bottom end, and a rectangular connecting block is fitted on the side wall near the top end. The handle has a rectangular hole that matches the rectangular connecting block. The handle is fitted onto the connecting block of the adjusting screw. The top end of the adjusting screw is also provided with an anti-loosening nut.

[0016] Furthermore, a positioning hole is also provided on the bottom surface of the valve body.

[0017] In this invention, the valve is connected to an external pipeline through an input port and an output port. The regulating valve is opened by the pressure of the load spring on the valve core. The pressure of the load spring on the valve core is balanced by the elastic force of the lifting spring on the valve core and the pressure of the fluid on the piston. After the fluid pressure acts on the valve core, a portion of the pressure is lost, thus achieving a pressure reduction effect and stabilizing the output pressure. By adjusting the elastic force of the load spring, the output medium pressure can be adjusted, improving practicality. Attached Figure Description

[0018] Figure 1A cross-sectional view of a high-pressure piston pressure-reducing regulating valve provided in an embodiment of this utility model;

[0019] Figure 2 This is a cross-sectional view of a high-pressure piston pressure reducing regulating valve provided in an embodiment of the present invention.

[0020] Figure 3 This is a cross-sectional view of the valve body in a high-pressure piston pressure-reducing regulating valve provided in an embodiment of the present invention.

[0021] Figure 4 This is a cross-sectional view of the valve body from another angle in an embodiment of the present utility model.

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of the valve body in a high-pressure piston pressure-reducing regulating valve provided in an embodiment of the present invention.

[0023] Figure 6 A cross-sectional view of the positioning plate in a high-pressure piston pressure-reducing regulating valve provided in this embodiment of the utility model;

[0024] Figure 7 This is a cross-sectional view of the handle in a high-pressure piston pressure-reducing regulating valve provided in an embodiment of the present invention.

[0025] Figure label:

[0026] 1. Valve body; 101. Valve cavity; 102. Inlet port; 103. Outlet port; 104. Second air supply port; 105. Mounting groove; 106. Flow channel hole; 107. Positioning hole; 108. Second exhaust port; 2. Sleeve; 201. First exhaust port; 3. Positioning sleeve; 301. Limiting plate; 302. Third through hole; 4. Fluid valve seat; 401. Second through hole; 5. Fixing sleeve; 6. Plug; 601 1. Fourth through hole; 7. Lifting spring; 8. Piston; 9. Unloading valve seat; 10. Guide support plate; 11. Guide plate; 12. Load spring; 13. Cylinder cover; 14. Positioning plate; 1401. First air inlet; 1402. First through hole; 1403. Flow channel groove; 15. Connecting block; 16. Handle; 17. Adjusting screw; 18. O-ring; 19. Anti-loosening nut; 20. Valve core; 21. Filter element. Detailed Implementation

[0027] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0028] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of this utility model, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this utility model, and are not intended to 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 the embodiments of this utility model.

[0029] In this embodiment of the invention, 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 indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0030] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0031] References to "one embodiment" or "some embodiments" as used in this specification mean that one or more embodiments of the present invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0032] Example:

[0033] Reference Figures 1-6As shown, a high-pressure piston 8 pressure-reducing regulating valve includes a valve body 1 and a sleeve 2. The valve body 1 has a cylindrical structure with a mounting groove 105 on its upper end face. A valve cavity 101 is opened in the middle of the bottom surface of the mounting groove 105. An input hole 102 and an output hole 103 are opened on the side wall of the valve body 1. The input hole 102 is connected to the valve cavity 101. The bottom surface of the mounting groove 105 is also provided with a flow channel hole 106 connected to the output hole 103. A positioning sleeve 3 is threadedly connected to the opening of the valve cavity 101. A limiting plate 301 is provided at the top of the positioning sleeve 3, and a plug 6 is threadedly connected to the inner wall of the bottom end. A fluid valve seat 4 is locked inside the positioning sleeve 3 against the limiting plate 301. A fixing sleeve 5 is provided below the fluid valve seat 4. The top of the fixing sleeve 5 is connected to the flow channel hole 106. The valve seat 4 abuts against the blockage 6 at its bottom end. A valve core 20 that mates with the valve seat is slidably installed inside the fixed sleeve 5. A lifting spring 7 is provided between the bottom end of the valve core 20 and the blockage 6. The top end of the valve core 20 passes through the fluid valve seat 4 and the limiting plate 301. A positioning plate 14 is inserted into the mounting groove 105. A flow channel groove 1403 is opened on the adjacent surface of the positioning plate 14 and the mounting groove 105. The flow channel groove 1403 is connected to the flow channel hole 106. A first through hole 1402 is opened in the middle of the positioning plate 14. A piston 8 is slidably installed in the first through hole 1402. An unloading valve seat 9 is inserted into the bottom surface of the piston 8. The top end of the valve core 20 abuts against the bottom surface of the unloading valve seat 9. A guide support plate 10 is provided on the top surface of the piston 8.

[0034] The bottom end of the sleeve 2 is threaded to the outer wall of the top of the valve body 1. A guide plate 11 is slidably arranged inside the sleeve 2. A load spring 12 is provided between the guide plate 11 and the guide support plate 10. A sleeve cover 13 is threaded to the top of the sleeve 2. An adjusting screw 17 is threaded to the sleeve cover 13. One end of the adjusting screw 17 abuts against the guide plate 11, and the other end is connected to a handle 16.

[0035] The fluid valve seat 4 has a second through hole 401, the limit plate 301 has a third through hole 302, and the plug 6 has a fourth through hole 601. The second through hole 401, the third through hole 302, and the fourth through hole 601 facilitate the passage of the medium.

[0036] The fluid valve seat 4 is connected to an external pipeline through the inlet port 102 and the outlet port 103. It is locked inside the positioning sleeve 3 and abuts against the limiting plate 301. The fluid valve seat 4 is supported by the fixing sleeve 5, and the position of the fixing sleeve 5 is positioned by the plug 6, thus stabilizing the position of the fluid valve seat 4. Simultaneously, the plug 6 supports the lifting spring 7, allowing the lifting spring 7 to exert a spring force on the valve core 20. The top of the valve core 20 abuts against the unloading valve seat 9, which is locked onto the piston 8. The piston 8 abuts against the load spring 12, which exerts a spring force on the piston 8, and in turn, on the valve core 20. The spring force of the load spring 12 acts downwards on the valve core 20, while the lifting spring 7 and the medium pressure act upwards on the valve core 20. When the medium is delivered, the lifting spring 7 buffers part of the elastic force of the load spring 12, and the medium pressure buffers another part of the medium pressure, thereby consuming part of the medium pressure and achieving the effect of pressure reduction. Since the elastic forces of the load spring 12 and the lifting spring 7 are stable, the medium pressure loss is stable. When the pressure of the medium input through the input port 102 is stable, the pressure of the pressure-reduced medium output through the output port 103 is also stable. The load spring 12 is positioned by the guide plate 11 and the guide support plate 10, which also ensures that the load spring 12 contracts and moves stably when squeezed, thereby ensuring the stability of the action of the load spring 12 on the piston 8, ensuring the stability of the pressure of the medium on the piston 8 in the flow channel groove 1403, making the medium pressure output through the output port 103 stable, and improving the stability of the regulating valve.

[0037] The positioning sleeve 3 is threaded into the valve cavity 101. The positioning sleeve 3 is positioned by the limiting plate 301 to ensure that the positioning sleeve 3 is at the top opening of the valve cavity 101. The bottom opening of the valve cavity 101 is sealed by the plug 6. The plug 6 supports and positions the fixing sleeve 5, and the fixing sleeve 5 supports and positions the fluid valve seat 4 to ensure the stability of the fluid valve seat 4. This ensures the effective cooperation between the valve core 20 and the fluid valve seat 4 and guarantees the stability of the pressure when the medium passes through the fluid valve seat 4.

[0038] By rotating the handle 16, the adjusting screw 17 is driven to rotate. The adjusting screw 17 moves up and down, which in turn pushes the guide plate 11 to move downward or causes the guide plate 11 to move upward under the action of the load spring 12. This adjusts the force of the load spring 12 on the piston 8, thereby adjusting the position of the valve core 20, the force of the lifting spring 7 between the valve core 20 and the plug 6, and the pressure of the medium in the flow channel groove 1403 on the surface of the piston 8. The elastic force of the lifting spring 7 plus the pressure of the medium on the surface of the piston 8 are balanced with the elastic force of the load spring 12.

[0039] The top side wall of the sleeve 2 has a first vent hole 201.

[0040] The first exhaust port 201 facilitates the adjustment of the air pressure inside the sleeve 2 above the guide plate 11, making the air pressure the same as the external atmospheric pressure. This maintains the stability of the air pressure above the guide plate 11 and prevents the air pressure from affecting the movement of the guide plate 11 when it moves up and down, thereby affecting the elastic force of the load spring 12 and thus affecting the stability of the medium output pressure.

[0041] The positioning plate 14 has a first air supply hole 1401, the valve body 1 has a second exhaust hole 108 on its side wall, and the mounting groove 105 has a second air supply hole 104 on its bottom surface. One end of the second air supply hole 104 is connected to the first air supply hole 1401, and the other end is connected to the second exhaust hole 108.

[0042] The air pressure below the guide plate 11 inside the sleeve 2 is the same as the external atmospheric pressure through the first air inlet 1401, the second air inlet 104, and the second exhaust port 108. This keeps the air pressure below the guide plate 11 stable and prevents the air pressure from affecting the movement of the guide plate 11 and thus affecting the elastic force of the load spring 12, thereby affecting the stability of the medium output pressure.

[0043] Two sets of O-rings 18 are provided on the contact surface between the positioning plate 14 and the valve body 1. The connection between the first air inlet 1401 and the second air inlet 104 is located between the two sets of O-rings 18. O-rings 18 are embedded on the contact surface between the piston 8 and the positioning plate 14, on the contact surface between the unloading valve seat 9 and the piston 8, on the contact surface between the fluid valve seat 4 and the positioning sleeve 3, and on the contact surface between the guide plate 11 and the sleeve 2. By setting O-rings 18, the sealing performance inside the regulating valve is improved, preventing media leakage and enhancing the safety of the regulating valve operation.

[0044] The blockage 6 contains a filter element 21, and the lifting spring 7 rests against the filter element 21.

[0045] By filtering the medium through the filter element 21, impurities can be prevented from entering the valve body 1, thus avoiding the impact of impurities on the adjustment accuracy.

[0046] The piston 8 has a positioning block on its top surface, and the guide support plate 10 has a positioning groove on its bottom surface that matches the positioning block.

[0047] The piston 8 supports the guide support plate 10 through the cooperation of the positioning plate 14 and the positioning groove, preventing the guide support plate 10 from changing position due to the elastic force, which would affect the force stability of the piston 8 and thus affect the pressure regulation accuracy.

[0048] The top diameter of the adjusting screw 17 is smaller than the bottom diameter. A rectangular connecting block 15 is fitted on the side wall near the top. The handle 16 has a rectangular hole that matches the rectangular connecting block 15. The handle 16 is fitted onto the connecting block 15 of the adjusting screw 17. The top of the adjusting screw 17 is also provided with an anti-loosening nut 19.

[0049] The small diameter of the top end of the adjusting screw 17 makes it easy to hold the handle 16 in place. The rectangular connecting block 15 fits into the rectangular hole, which makes it easy for the handle 16 to drive the adjusting screw 17 to rotate. The anti-disengagement nut 19 presses the handle 16 to prevent it from falling off the adjusting screw 17.

[0050] The bottom surface of valve body 1 also has a positioning hole 107.

[0051] The positioning hole 107 facilitates the installation of the control valve in the operating position, ensuring the stability of the control valve's position during use and guaranteeing the stability of the control valve's output pressure.

[0052] In use, the medium is connected to an external input pipeline through the input port 102 connector and to an external output pipeline through the output port 103 connector. The medium pressure input through the input port 102 is constant. The medium enters the valve chamber 101 through the input port 102, then enters the fixed sleeve 5 through the fourth through port 601, and then enters the chamber formed by the flow channel groove 1403 and the mounting groove 105 through the second through port 401 and the third through port 302, exerting pressure on the bottom surface of the piston 8. The piston 8 is balanced by the medium pressure and the elastic force of the lifting spring 7 on the valve core 20, and the elastic force of the load spring 12 on the piston 8. The pressure of the medium is reduced relative to the pressure at the input port 102, achieving a pressure reduction effect. The pressure on the piston 8 reaches a dynamic balance state, and the output pressure is stable.

[0053] When the handle 16 is turned, causing the adjusting screw 17 to move downward, the adjusting screw pushes the guide plate 11 downward. The guide plate 11 compresses the load spring 12, increasing the pressure on the top surface of the piston 8. The piston 8 moves downward, pushing the valve core 20 downward, causing the lifting spring 7 to contract. The lifting spring 7 exerts a greater force on the piston 8, but the change in the elasticity of the lifting spring 7 is relatively small. At this time, the pressure of the medium in the flow channel 1403 on the bottom surface of the piston 8 increases to balance the pressure of the load spring 12 on the piston 8. The flow channel 1403 is connected to the output hole 103 through the flow channel hole 106, thereby increasing the pressure of the medium output from the output hole 103. When the handle 16 is turned, the adjusting rod moves upward, and the adjusting screw 17 no longer presses against the guide plate 11. The guide plate 11 moves upward under the force of the load spring 12. The force of the load spring 12 decreases, which reduces the pressure on the top surface of the piston 8. The piston 8 moves upward, and the valve core 20 moves upward under the action of the lifting spring 7. The force of the load spring 12 decreases significantly, while the force of the lifting spring 7 decreases less. Therefore, the pressure of the medium on the piston 8 in the flow channel groove 1403 decreases, and the pressure of the medium decreases, thereby reducing the pressure of the medium output from the output hole 103.

[0054] In actual use, the valve body 1 has two input holes 102 and two output holes 103 on its side wall. One input hole 102 and one output hole 103 are used to connect to the external medium conveying pipeline, while the other input hole 102 and output hole 103 are connected to a pressure gauge, which allows the operator to check the medium pressure at the regulating valve input hole 102 and output hole 103 in real time. This allows the operator to adjust the medium output pressure as needed and also check whether the regulating valve is working properly.

[0055] The rectangular connecting block 15 is integrally formed with the adjusting screw 17, which improves the stress resistance of the adjusting screw 17.

[0056] A spherical washer is fitted onto the anti-loosening nut 19 on the adjusting screw 17 to prevent the anti-loosening nut 19 from loosening and causing the handle 16 to fall off.

[0057] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. In the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A high-pressure piston pressure-reducing regulating valve, characterized in that, The device includes a valve body and a sleeve. The valve body has a cylindrical structure with a mounting groove on its upper surface. A valve cavity is formed in the center of the bottom surface of the mounting groove. An inlet hole and an outlet hole are formed on the side wall of the valve body. The inlet hole communicates with the valve cavity. A flow channel hole communicating with the outlet hole is also provided on the bottom surface of the mounting groove. A positioning sleeve is threadedly connected to the opening of the valve cavity. A limiting plate is provided at the top of the positioning sleeve, and a plug is threadedly connected to the inner wall of the bottom end. A fluid valve seat is held in place by the limiting plate inside the positioning sleeve. A fixing sleeve is provided below the fluid valve seat, and the top of the fixing sleeve abuts against the fluid valve seat. The bottom end abuts against the blockage. A valve core that slidably cooperates with the valve seat is slidably arranged inside the fixed sleeve. A lifting spring is provided between the bottom end of the valve core and the blockage. The top end passes through the fluid valve seat and the limiting plate. A positioning plate is locked in the mounting groove. A flow channel groove is opened on the adjacent surface of the positioning plate and the mounting groove. The flow channel groove is connected to the flow channel hole. A first through hole is opened in the middle of the positioning plate. A piston is slidably arranged in the first through hole. An unloading valve seat is locked on the bottom surface of the piston. The top end of the valve core abuts against the bottom surface of the unloading valve seat. A guide support plate is provided on the top surface of the piston. The bottom end of the sleeve is threadedly connected to the outer wall of the top end of the valve body. A guide plate is slidably arranged inside the sleeve. A load spring is provided between the guide plate and the guide support plate. A sleeve cover is threadedly connected to the top end of the sleeve. An adjusting screw is threadedly connected to the sleeve cover. One end of the adjusting screw abuts against the guide plate, and the other end is connected to a handle. The fluid valve seat has a second through hole, the limiting plate has a third through hole, and the plug has a fourth through hole.

2. The high-pressure piston pressure-reducing regulating valve according to claim 1, characterized in that, The top side wall of the sleeve has a first vent hole.

3. The high-pressure piston pressure-reducing regulating valve according to claim 1, characterized in that, The positioning plate has a first air supply hole, the valve body side wall has a second exhaust hole, the bottom surface of the mounting groove has a second air supply hole, one end of the second air supply hole is connected to the first air supply hole, and the other end is connected to the second exhaust hole.

4. A high-pressure piston pressure-reducing regulating valve according to claim 3, characterized in that, The contact surface between the positioning plate and the valve body is provided with two sets of O-rings. The connection between the first air inlet and the second air inlet is located between the two sets of O-rings. The contact surface between the piston and the positioning plate is provided with O-rings. The contact surface between the unloading valve seat and the piston is provided with O-rings. The contact surface between the fluid valve seat and the positioning sleeve is provided with O-rings. The contact surface between the guide plate and the sleeve is provided with O-rings.

5. A high-pressure piston pressure-reducing regulating valve according to claim 1, characterized in that, The blockage contains a filter element, and the lifting spring rests against the filter element.

6. A high-pressure piston pressure-reducing regulating valve according to claim 1, characterized in that, The piston has a positioning block on its top surface, and the guide support plate has a positioning groove on its bottom surface that matches the positioning block.

7. A high-pressure piston pressure-reducing regulating valve according to claim 1, characterized in that, The diameter of the top end of the adjusting screw is smaller than that of the bottom end. A rectangular connecting block is fitted on the side wall near the top end. The handle has a rectangular hole that matches the rectangular connecting block. The handle is fitted onto the connecting block of the adjusting screw. The top end of the adjusting screw is also provided with an anti-loosening nut.

8. A high-pressure piston pressure-reducing regulating valve according to claim 1, characterized in that, The bottom surface of the valve body also has a positioning hole.

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