Relief valve

Abstract

The present invention belongs to the field of valve technology, and discloses a relief valve. The relief valve comprises a valve seat and a valve core assembly, wherein the valve seat is provided with an oil inlet and an oil return port, the valve core assembly is slidably arranged in the valve seat, an adjustment assembly is installed at one end of the valve seat, a pressure regulating spring is arranged in the valve seat, one end of the pressure regulating spring abuts against the valve core assembly, and the other end abuts against the adjustment assembly, a damping chamber extending along its axial direction and closed is arranged inside the valve core assembly, an elastic damping component is accommodated in the damping chamber, one end of the elastic damping component is connected to the cavity top of the damping chamber, and the other end of the elastic damping component is connected to the cavity bottom of the damping chamber, and the elastic damping component is used to hinder the axial movement of the valve core assembly. In the relief valve provided by the present invention, the elastic damping component can hinder the movement of the valve core assembly, effectively absorb the kinetic energy of the valve core assembly during movement, thereby realizing the functions of vibration reduction, energy absorption and noise reduction.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a relief valve. Background Art

[0002] The overflow valve is generally used in hydraulic equipment and mainly plays the role of constant pressure and flow, pressure stabilization, system unloading and safety protection. The existing overflow valve mainly includes a valve seat, a valve core and a pressure regulating spring. The valve core is slidably arranged in the valve seat and compresses the pressure regulating spring.

[0003] However, due to the continuous change of pressure, the valve core will keep moving under the combined action of the hydraulic pressure and the pressure-regulating spring. When the excitation frequency of the oil pressure is close to the frequency of the valve core plus spring system itself, resonance will occur. At this time, the valve core will keep hitting the valve port of the valve seat, generating vibration and noise. This frequent opening and closing will also cause the valve core and the valve seat to be subjected to high-frequency rigid impacts with each other, resulting in large wear. At the same time, it will also reduce the reliability of the pressure-regulating spring, valve seat and valve core, thereby reducing the reliability and service life of the entire relief valve.

[0004] Therefore, there is an urgent need to provide a relief valve to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a relief valve which has the function of reducing vibration and stabilizing pressure, thereby extending the service life of the relief valve.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The overflow valve comprises a valve seat and a valve core assembly, the valve seat is provided with an oil inlet and an oil return port, the valve core assembly is slidably arranged in the valve seat, an adjusting assembly is installed at one end of the valve seat, a pressure regulating spring is arranged in the valve seat, one end of the pressure regulating spring abuts against the valve core assembly, and the other end abuts against the adjusting assembly, a damping chamber extending axially and closed is arranged inside the valve core assembly, an elastic damping component is accommodated in the damping chamber, one end of the elastic damping component is connected to the cavity top of the damping chamber, and the other end of the elastic damping component is connected to the cavity bottom of the damping chamber, and the elastic damping component is used to hinder the axial movement of the valve core assembly.

[0008] As an optional solution, the elastic damping component includes a first elastic member, a damping block and a second elastic member, one end of the first elastic member and the second elastic member are both against the inner wall of the damping cavity, and the damping block is connected between the first elastic member and the second elastic member.

[0009] As an optional solution, the elastic damping component further includes a ball, and the ball is rollingly arranged between the damping block and the side wall of the damping chamber.

[0010] As an optional solution, a ball groove is opened on the side wall of the damping block, and the ball is partially accommodated in the ball groove.

[0011] As an optional scheme, the valve core assembly includes a valve core body and a plug, the valve core body is provided with a damping chamber with an opening at one end, the plug is detachably connected to the valve core body to form a closed damping chamber, one end of the elastic damping component is connected to the plug, and the other end of the elastic damping component is connected to the valve core body.

[0012] As an optional solution, the valve core assembly further includes a spring seat, which is sleeved on the outside of the valve core body, one end of the pressure regulating spring abuts against the spring seat, and the other end of the pressure regulating spring abuts against the regulating assembly.

[0013] As an optional solution, the adjustment assembly includes an end cover and a screw sleeve, at least part of the end cover is located inside the valve seat, at least part of the screw sleeve is located between the end cover and the valve seat, the outer wall of the screw sleeve is connected to the valve seat, and the inner wall of the screw sleeve is threadedly connected to the end cover to achieve adjustable axial position of the end cover.

[0014] As an optional solution, the end cover is provided with a accommodating cavity near one end of the pressure regulating spring, one end of the pressure regulating spring abuts against the valve core assembly, and the other end of the pressure regulating spring extends into the accommodating cavity and abuts against the bottom of the accommodating cavity.

[0015] As an optional solution, the regulating assembly further comprises a sealing member, which is sleeved outside the end cover, and along the radial direction of the valve seat, one side of the sealing member abuts against the valve seat, and the other side of the sealing member abuts against the end cover.

[0016] As an optional solution, the adjustment assembly further includes a nut, which is threadedly sleeved on the outside of the end cover and abuts against the outer end of the threaded sleeve.

[0017] Beneficial effects of the present invention:

[0018] The present invention provides a relief valve. When the relief valve is opened, the valve core assembly moves forward to the left. At this time, the elastic damping component starts to play a role and hinders the movement of the valve core assembly. When the relief valve reaches the maximum opening, the valve core assembly starts to move in the right direction. The elastic damping component will hinder the reverse movement of the valve core assembly. Therefore, the elastic damping component will hinder the forward or reverse movement of the valve core assembly when the relief valve is working, effectively absorbing the kinetic energy of the valve core assembly during the movement process, thereby ensuring that the valve core assembly is in a stable position, greatly increasing the pressure stability of the hydraulic system, achieving the functions of vibration absorption and noise reduction, and avoiding the valve core assembly from repeatedly hitting the valve seat, thereby ensuring the reliability of the pressure regulating spring, the valve seat and the valve core assembly, and further improving the reliability and service life of the entire relief valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the overflow valve provided by the present invention;

[0020] Figure 2 is a cross-sectional view of the relief valve provided by the present invention;

[0021] Figure 3 It is a schematic diagram of the cooperation between the valve core assembly and the elastic damping component provided by the present invention;

[0022] Figure 4 It is the working state of the elastic damping component during the opening process of the overflow valve provided by the present invention;

[0023] Figure 5 This is the working state of the elastic damping component during the closing process of the overflow valve provided by the present invention.

[0024] In the figure:

[0025] 1. Valve seat; 11. Oil inlet; 12. Oil return port; 13. Abutment portion; 14. Guide groove;

[0026] 2. Valve core assembly; 21. Valve core body; 211. Damping chamber; 212. Conical sealing surface; 213. Guide section; 22. Plug; 23. Spring seat;

[0027] 3. Adjustment assembly; 31. End cover; 311. Accommodation chamber; 32. Screw sleeve; 33. Seal; 34. Nut;

[0028] 4. elastic damping component; 41. first elastic member; 42. damping block; 421. ball groove; 43. second elastic member; 44. ball;

[0029] 5. Pressure-adjusting spring. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] like Figure 1 and Figure 2 As shown, this embodiment provides a relief valve, including a valve seat 1 and a valve core assembly 2, the valve seat 1 is provided with an oil inlet 11 and an oil return port 12, the valve core assembly 2 is slidably arranged in the valve seat 1 to adjust the connection state between the oil inlet 11 and the oil return port 12, an adjusting assembly 3 is installed at one end of the valve seat 1, a pressure regulating spring 5 is arranged in the valve seat 1, one end of the pressure regulating spring 5 abuts against the valve core assembly 2, and the other end abuts against the adjusting assembly 3.

[0035] Combination Figure 1 and Figure 2, the hydraulic oil enters from the oil inlet 11 of the valve seat 1, and the hydraulic pressure acts on the right end face of the valve core assembly 2 to the left. When the hydraulic pressure acting on the valve core assembly 2 is greater than the elastic force of the pressure regulating spring 5, the valve core assembly 2 moves to the left to open the oil inlet 11. At this time, the oil inlet 11 and the oil return port 12 are connected, and the hydraulic oil entering from the oil inlet 11 flows out from the oil return port 12, so that the excess flow overflows back to the oil tank, thereby playing the role of constant pressure and flow, pressure stabilization, system unloading and safety protection. When the hydraulic pressure acting on the valve core assembly 2 is less than the elastic force of the pressure regulating spring 5, the valve core assembly 2 moves to the right and finally cuts off the connection between the oil inlet 11 and the oil return port 12. When it is necessary to adjust the opening pressure of the overflow valve, change the depth of the adjusting assembly 3 screwed into the valve seat 1 to change the length of the pressure regulating spring 5, so that the pressure regulating spring 5 is further compressed or relaxed, thereby changing the opening pressure.

[0036] like Figure 1 As shown, the oil inlet 11 and the oil return port 12 are both opened on the peripheral side of the valve seat 1, and the oil inlet 11 and the oil return port 12 are both provided in plurality, and the plurality of oil inlet 11 and the plurality of oil return ports 12 are spaced and evenly arranged around the circumference of the valve seat 1.

[0037] However, when the overflow valve in the related technology is in use, due to the continuous change of pressure, the valve core will move continuously under the joint action of the hydraulic pressure and the pressure-regulating spring 5. When the excitation frequency of the oil pressure is close to the frequency of the valve core plus spring system itself, resonance will occur. At this time, the valve core will continuously hit the valve port of the valve seat 1, generating vibration and noise. Such frequent opening and closing will also cause the valve core and the valve seat 1 to be subjected to high-frequency rigid impacts with each other, resulting in large wear. At the same time, it will also reduce the reliability of the pressure-regulating spring 5, the valve seat 1 and the valve core, thereby reducing the reliability and service life of the entire overflow valve.

[0038] In order to solve the above problems, Figure 2 and Figure 3 As shown, in the present embodiment, a damping chamber 211 extending axially and closed is provided inside the valve core assembly 2, wherein the end of the damping chamber 211 close to the pressure regulating spring 5 is the chamber top, and the end away from the pressure regulating spring 5 is the chamber bottom. The damping chamber 211 accommodates an elastic damping component 4, one end of the elastic damping component 4 is connected to the chamber top of the damping chamber 211, and the other end of the elastic damping component 4 is connected to the chamber bottom of the damping chamber 211. The elastic damping component 4 is used to hinder the axial movement of the valve core assembly 2.

[0039] Among them, the elastic damping component 4 plays a role in hindering but not preventing the movement of the valve core assembly 2. When the relief valve is opened, the valve core assembly 2 moves forward to the left. At this time, the elastic damping component 4 begins to play a role and hinders the movement of the valve core assembly 2. When the relief valve reaches the maximum opening, the valve core assembly 2 begins to move in the right direction. The elastic damping component 4 will hinder the reverse movement of the valve core assembly 2. Therefore, when the relief valve is working, the elastic damping component 4 will hinder the forward or reverse movement of the valve core assembly 2, effectively absorbing the kinetic energy of the valve core assembly 2 during the movement, thereby ensuring that the valve core assembly 2 is in a stable position, greatly increasing the pressure stability of the hydraulic system, achieving the functions of vibration absorption and noise reduction, and preventing the valve core assembly 2 from repeatedly hitting the valve seat 1, thereby ensuring the reliability of the pressure regulating spring 5, the valve seat 1 and the valve core assembly 2, thereby improving the reliability and service life of the entire relief valve.

[0040] In this embodiment, if Figure 2 and Figure 3 As shown, the elastic damping component 4 specifically includes a first elastic member 41, a damping block 42, and a second elastic member 43. One end of the first elastic member 41 and the second elastic member 43 are both against the inner wall of the damping chamber 211. The outer diameter of the damping block 42 is slightly smaller than the inner diameter of the damping chamber 211. The damping block 42 is connected between the first elastic member 41 and the second elastic member 43. Specifically, the first elastic member 41 and the second elastic member 43 can be welded to the damping block 42. One end of the first elastic member 41 away from the damping block 42 is connected to the top of the damping chamber 211, and one end of the second elastic member 43 away from the damping block 42 is connected to the bottom of the damping chamber 211. In this embodiment, the first elastic member 41 and the second elastic member 43 can be springs.

[0041] like Figure 4 As shown, when the hydraulic pressure acting on the valve core assembly 2 is greater than the elastic force of the pressure regulating spring 5, the valve core assembly 2 moves to the left. At this time, the acceleration of the valve core assembly 2 is to the left, the second elastic member 43 is compressed, and the first elastic member 41 is stretched. Overall, the force applied by the internal elastic member to the valve core assembly 2 is to the right (+X direction), thereby preventing the valve core assembly 2 from moving to the left. Figure 5 As shown, when the liquid pressure acting on the valve core assembly 2 is less than the elastic force of the pressure-adjusting spring 5, the valve core assembly 2 moves to the right. At this time, the acceleration of the valve core assembly 2 is to the right, the first elastic member 41 is compressed, and the second elastic member 43 is stretched. Overall, the force applied by the internal elastic member to the valve core assembly 2 is to the right (-X direction), thereby hindering the valve core assembly 2 from moving to the right.

[0042] Therefore, no matter what the motion state of the valve core assembly 2 is, the force of the first elastic member 41 and the second elastic member 43 in the internal damping chamber 211 on the valve core assembly 2 is opposite to the direction of the external force, effectively absorbing external kinetic energy, achieving the purpose of reducing impact and noise, and the higher the acceleration of the valve core assembly 2, the stronger the internal damping effect, achieving the effect of "stronger when facing strong forces". At the same time, the fundamental reason for the generation of the internal damping force of the valve core assembly 2 is the external acceleration, so the elastic damping component 4 plays a role in hindering but not preventing the movement of the valve core assembly 2, and therefore does not affect the performance of the valve.

[0043] In another optional embodiment, two damping blocks 42 may be provided between the first elastic member 41 and the second elastic member 43 , and another elastic member may be provided between the two damping blocks 42 , which can also achieve the above-mentioned damping effect.

[0044] Furthermore, if Figure 3 As shown, the elastic damping component 4 also includes a ball 44, which is rolled and arranged between the damping block 42 and the side wall of the damping chamber 211. When the damping block 42 moves relative to the valve core assembly 2, the ball 44 has a certain supporting effect on the damping block 42, and the ball 44 can convert the sliding friction between the damping block 42 and the valve core assembly 2 into rolling friction, thereby reducing the friction force and extending the service life. At the same time, the hydraulic oil can lubricate the ball 44, and there is no need to add lubricating oil separately for maintenance.

[0045] like Figure 3 As shown, a ball groove 421 is provided on the side wall of the damping block 42, and the ball 44 is partially accommodated in the ball groove 421. The ball groove 421 is used to fix and limit the ball 44. The ball 44 rotates in the ball groove 421, which can ensure the stability and reliability of the movement of the ball 44.

[0046] In an optional embodiment, the ball groove 421 may be an annular groove surrounding the damping block 42, a circle of balls 44 may be arranged in the annular groove, and one, two or more annular grooves may be arranged along the axial direction of the damping block 42. In another optional embodiment, the ball groove 421 may be two, three, four or more individually opened grooves uniformly and spaced around the damping block 42, and one ball 44 is accommodated in each groove.

[0047] like Figure 2 and Figure 3As shown, the valve core assembly 2 includes a valve core body 21 and a plug 22. The valve core body 21 is used to achieve communication or cutoff between the oil inlet 11 and the oil return port 12. A damping chamber 211 with an opening at one end is provided in the valve core body 21. The plug 22 is detachably connected to the valve core body 21 to form a closed damping chamber 211. The surface of the plug 22 serves as the cavity top of the damping chamber 211. One end of the elastic damping component 4 is connected to the plug 22, and the other end of the elastic damping component 4 is connected to the valve core body 21. Specifically, one end of the first elastic member 41 away from the damping block 42 can be hooked and connected to the plug 22, and one end of the second elastic member 43 away from the damping block 42 can be hooked and connected to the valve core body 21. The plug 22 can be connected to the valve core body 21 by threaded connection, which is convenient for disassembly and assembly, thereby facilitating maintenance and replacement of parts.

[0048] Specifically, Figure 2 As shown, the valve seat 1 is provided with an abutment portion 13, which is a right-angle structure, and a conical sealing surface 212 is formed on the valve core body 21. When the conical sealing surface 212 abuts against the abutment portion 13, the oil inlet 11 and the oil return port 12 are disconnected, and the seal between the conical sealing surface 212 and the abutment portion 13 is a line contact seal formed by the annular line and the conical surface, and the sealing effect is good.

[0049] Furthermore, if Figure 2 As shown, a guide groove 14 is provided at one end of the valve seat 1 near the oil inlet 11, and a guide section 213 adapted to the guide groove 14 is formed at one end of the valve core body 21, so that a structure similar to an axial hole matching is formed between the valve core body 21 and the valve seat 1, ensuring the coaxiality between the valve core body 21 and the valve seat 1 during the opening and closing process, allowing the valve core body 21 to move more smoothly.

[0050] like Figure 2 As shown, the valve core assembly 2 also includes a spring seat 23, which is sleeved on the outside of the valve core body 21, one end of the pressure regulating spring 5 abuts against the spring seat 23, and the other end of the pressure regulating spring 5 abuts against the regulating assembly 3. The elastic force of the pressure regulating spring 5 can act on the valve core body 21 through the spring seat 23, and the spring seat 23 and the valve core body 21 can be an integrally formed structure, or the spring seat 23 and the valve core body 21 can also be processed separately, and then connected into one by threaded connection or welding, etc., so that the processing of the spring seat 23 and the valve core body 21 is convenient.

[0051] Furthermore, in the present embodiment, the adjusting assembly 3 comprises an end cover 31 and a screw sleeve 32, at least a portion of the end cover 31 is located inside the valve seat 1, at least a portion of the screw sleeve 32 is located between the end cover 31 and the valve seat 1, an outer wall of the screw sleeve 32 is connected to the valve seat 1, an outer ring of the screw sleeve 32 and the valve seat 1 may be optionally threaded, interference fit or connected via a wire retaining ring, an inner wall of the screw sleeve 32 is threadedly connected to the end cover 31 to achieve adjustable axial position of the end cover 31, and to facilitate adjustment of the depth of the end cover 31 screwed into the valve seat 1, so as to change the length of the pressure regulating spring 5, thereby changing the valve opening pressure of the relief valve.

[0052] like Figure 2 As shown, an accommodating cavity 311 is formed at one end of the end cover 31 close to the pressure regulating spring 5, one end of the pressure regulating spring 5 abuts against the spring seat 23 of the valve core assembly 2, and the other end of the pressure regulating spring 5 extends into the accommodating cavity 311 and abuts against the bottom of the accommodating cavity 311. A part of the pressure regulating spring 5 is located in the accommodating cavity 311, which can reduce the axial size of the entire relief valve and is conducive to the miniaturization of the product.

[0053] Furthermore, if Figure 2 As shown, the regulating assembly 3 further includes a sealing member 33, which is sleeved outside the end cover 31, and along the radial direction of the valve seat 1, one side of the sealing member 33 abuts against the valve seat 1, and the other side of the sealing member 33 abuts against the end cover 31. In this way, a good sealing effect can be achieved between the end cover 31 and the valve seat 1 to avoid leakage. The sealing member 33 can be an O-ring.

[0054] like Figure 2 As shown, the adjustment assembly 3 further includes a nut 34 , which is threadedly mounted outside the end cover 31 and abuts against the outer end of the threaded sleeve 32 , and the nut 34 can prevent the threaded sleeve 32 from loosening.

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Relief valve, characterized in that: The invention comprises a valve seat (1) and a valve core assembly (2), wherein the valve seat (1) is provided with an oil inlet (11) and an oil return port (12), the valve core assembly (2) is slidably arranged in the valve seat (1), an adjusting assembly (3) is installed at one end of the valve seat (1), a pressure regulating spring (5) is arranged in the valve seat (1), one end of the pressure regulating spring (5) abuts against the valve core assembly (2), and the other end abuts against the adjusting assembly (3), the interior of the valve core assembly (2) is provided with a damping chamber (211) extending along its axial direction and arranged in a closed manner, the damping chamber (211) contains an elastic damping component (4), one end of the elastic damping component (4) is connected to the cavity top of the damping chamber (211), and the other end of the elastic damping component (4) is connected to the cavity bottom of the damping chamber (211), and the elastic damping component (4) is used to hinder the axial movement of the valve core assembly (2).

2. The relief valve according to claim 1, characterized in that: The elastic damping component (4) comprises a first elastic member (41), a damping block (42) and a second elastic member (43); one end of the first elastic member (41) and one end of the second elastic member (43) are both in contact with the inner wall of the damping chamber (211); and the damping block (42) is connected between the first elastic member (41) and the second elastic member (43).

3. The relief valve according to claim 2, characterized in that: The elastic damping component (4) further comprises a ball (44), wherein the ball (44) is arranged to roll between the damping block (42) and the side wall of the damping chamber (211).

4. The relief valve according to claim 3, characterized in that: A ball groove (421) is provided on the side wall of the damping block (42), and the ball (44) is partially accommodated in the ball groove (421).

5. The relief valve according to claim 1, characterized in that: The valve core assembly (2) comprises a valve core body (21) and a plug (22); a damping chamber (211) having an opening at one end is provided in the valve core body (21); the plug (22) is detachably connected to the valve core body (21) to form a closed damping chamber (211); one end of the elastic damping component (4) is connected to the plug (22), and the other end of the elastic damping component (4) is connected to the valve core body (21).

6. The relief valve according to claim 5, characterized in that: The valve core assembly (2) further comprises a spring seat (23), wherein the spring seat (23) is sleeved outside the valve core body (21), one end of the pressure regulating spring (5) abuts against the spring seat (23), and the other end of the pressure regulating spring (5) abuts against the regulating assembly (3).

7. The relief valve according to claim 1, characterized in that: The regulating assembly (3) comprises an end cover (31) and a screw sleeve (32), wherein at least a portion of the end cover (31) is located inside the valve seat (1), and at least a portion of the screw sleeve (32) is located between the end cover (31) and the valve seat (1), an outer side wall of the screw sleeve (32) is connected to the valve seat (1), and an inner side wall of the screw sleeve (32) is threadedly connected to the end cover (31), so as to achieve adjustable axial position of the end cover (31).

8. The relief valve according to claim 7, characterized in that: The end cover (31) is provided with a receiving cavity (311) at one end close to the pressure regulating spring (5); one end of the pressure regulating spring (5) abuts against the valve core assembly (2); the other end of the pressure regulating spring (5) extends into the receiving cavity (311) and abuts against the bottom of the receiving cavity (311).

9. The relief valve according to claim 7, characterized in that: The regulating assembly (3) further comprises a sealing member (33), wherein the sealing member (33) is sleeved outside the end cover (31), and along the radial direction of the valve seat (1), one side of the sealing member (33) abuts against the valve seat (1), and the other side of the sealing member (33) abuts against the end cover (31).

10. The relief valve according to claim 7, characterized in that: The adjustment assembly (3) further comprises a nut (34), wherein the nut (34) is threadedly sleeved on the outside of the end cover (31) and abuts against the outer end of the threaded sleeve (32).

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