A pressure relief valve with adjustable opening pressure

Abstract

The application provides a pressure relief valve with adjustable opening pressure, comprising a valve body, a valve disc, a valve rod, a sealing assembly and an adjusting hand wheel; the valve disc is sleeved on the outer peripheral wall of the valve rod and is located in the valve body, and is used for limiting the stroke of the valve rod; the sealing assembly is movably arranged in the valve body and is used for controlling the opening or closing of the pressure relief valve; one end of the valve rod is in abutment with the adjusting hand wheel, and the other end of the valve rod moves in the valve body under the driving of the adjusting hand wheel, and the distance between the other end of the valve rod and the sealing assembly is adjusted, so as to adjust the opening pressure of the pressure relief valve. The application adjusts the height of the valve rod by rotating the adjusting hand wheel, so as to adjust the distance between the sealing assembly and the valve rod, realizes the adjustment of the opening pressure of the pressure relief valve, is safer and more convenient, can quickly respond to the demand due to the characteristics of short stroke and large load, and increases the applicability.

Description

Technical Field

[0001] This application relates to the field of pressure relief valves, and more specifically, to a pressure relief valve with adjustable opening pressure. Background Technology

[0002] As pressure relief valve technology is increasingly applied across various industries, the performance of traditional pressure relief valves is constantly improving, making the development of new pressure relief valve products that meet market demands imperative. Currently used pressure relief valves often encounter several problems: limited installation height (high-pressure relief valves are too tall); non-adjustable pressure, limiting applicability; slow or jammed pressure relief process, etc. For these reasons, conventional pressure relief valves can no longer meet the diverse needs of the market. Utility Model Content

[0003] In view of one of the defects in the prior art, the purpose of this application is to provide a pressure relief valve with adjustable opening pressure.

[0004] A first aspect of this application provides a pressure relief valve with adjustable opening pressure, comprising: a valve body, a valve disc, a valve stem, a sealing assembly, and an adjusting handwheel;

[0005] The valve disc is sleeved on the outer peripheral wall of the valve stem and located in the valve body, and is used to limit the stroke of the valve stem;

[0006] The sealing assembly is movably disposed within the valve body and is used to control the opening or closing of the pressure relief valve;

[0007] One end of the valve stem abuts against the adjusting handwheel, and the other end of the valve stem moves within the valve body under the drive of the adjusting handwheel. Adjusting the distance between the other end of the valve stem and the sealing assembly adjusts the opening pressure of the pressure relief valve.

[0008] Optionally, the valve body includes: a valve cap, an upper valve seat, a lower valve seat, and a guide sleeve;

[0009] The valve cap is connected to one end of the upper valve seat, and one end of the valve disc is disposed inside the upper valve seat, while the other end is located inside the valve cap;

[0010] The guide sleeve is disposed between the upper valve seat and the lower valve seat to form a receiving chamber;

[0011] The outer circumferential wall of the adjusting handwheel is threadedly connected to the inner wall of the valve cap, and the rotation drives the valve stem to move within the valve body;

[0012] The lower valve seat is provided with an air inlet, and the sealing assembly is movably disposed within the lower valve seat to block the air inlet when subjected to pressure.

[0013] Optionally, the pressure relief valve further includes a stop ring disposed between the valve cap and the adjusting handwheel to limit the rotation angle of the adjusting handwheel and prevent the adjusting handwheel from rotating too much and coming off the valve cap.

[0014] Optionally, the pressure relief valve further includes a bushing and a disc spring assembly;

[0015] The bushing and the disc spring assembly are movably disposed within the receiving cavity;

[0016] The bushing is fitted onto the outer peripheral wall of the other end of the valve stem, and the disc spring assembly is fitted onto the outer peripheral wall of the bushing. The bushing is used to restrict the movement of the disc spring assembly.

[0017] Optionally, one end of the bushing is provided with a boss integrally formed with the bushing, and the other end is provided with a retaining ring;

[0018] One end of the disc spring assembly abuts against the retaining ring, and the other end of the disc spring assembly abuts against one end face of the boss;

[0019] The other end face of the bushing with the boss abuts against the sealing assembly. The bushing moves under the push of the sealing assembly, and the valve stem extends out from the bushing and abuts against the sealing assembly.

[0020] Optionally, the pressure relief valve further includes a spring;

[0021] There is a gap between the inner peripheral wall of the bushing and the outer peripheral wall of the valve stem. The spring is sleeved on the valve stem and located in the gap. One end of the spring abuts against the valve disc, and the other end is located in the bushing. It is used to reset the valve stem when the adjusting handwheel is rotated upward.

[0022] The disc spring assembly is used to push the bushing when the pressure decreases, and the bushing pushes the sealing assembly to block the air inlet.

[0023] Optionally, the sealing assembly includes: a sealing gasket, a sealing bushing, and a sealing gasket copper sleeve;

[0024] The sealing gasket is disposed at one end of the sealing gasket copper sleeve, and the other end of the sealing gasket copper sleeve blocks the air inlet;

[0025] The sealing gasket and the sealing gasket copper sleeve are disposed inside the sealing bushing;

[0026] The sealing gasket copper sleeve is pressed and sealed with the sealing shaft sleeve by the sealing gasket. Under the action of external pressure, the sealing gasket copper sleeve pushes the sealing shaft sleeve to move.

[0027] Optionally, one end of the sealing bushing abuts against the end of the bushing where the boss is located;

[0028] The bushing with the boss has a limiting hole at one end, and the sealing bushing has a connecting hole at one end that is opposite to the limiting hole. The sealing gasket seals the connecting hole.

[0029] When the air inlet is subjected to external pressure, it pushes the sealing assembly to move the bushing and compress the disc spring assembly and the spring. The other end of the valve stem extends into the limiting hole and the connecting hole, pushing the sealing gasket copper sleeve to create a gap between the sealing gasket copper sleeve and the sealing bushing, thereby relieving pressure.

[0030] Optionally, a sealing groove is provided between the lower valve seat and the sealing bushing, and a first O-ring is provided in the sealing groove to prevent gas from flowing out between the sealing bushing and the lower valve seat.

[0031] Optionally, a second O-ring is provided on the outer peripheral wall of the end of the lower valve seat where the air inlet is located, to ensure that no gas leaks from the outside during the air intake process when the air inlet of the lower valve seat is connected to an external device.

[0032] This application provides a pressure relief valve with adjustable opening pressure. It adopts the technique of adding an adjusting handwheel to the pressure relief valve. By rotating the adjusting handwheel, the height of the valve stem is adjusted, thereby adjusting the distance between the sealing component and the valve stem, so as to adjust the opening pressure of the pressure relief valve. It is safer and more convenient. Due to its short stroke and high load characteristics, it can quickly respond to the demand. The wide adjustable range greatly increases its applicability.

[0033] Other technical effects resulting from the additional features will be further illustrated in the corresponding embodiments. Attached Figure Description

[0034] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0035] Figure 1 This is a structural diagram illustrating an adjustable opening pressure relief valve according to an exemplary embodiment;

[0036] Figure 2 This is a cross-sectional view of a pressure relief valve AA with adjustable opening pressure according to an exemplary embodiment;

[0037] In the diagram: 1. Lower valve seat; 100. Air inlet; 101. Sealing groove; 2. Guide sleeve; 3. Bushing; 301. Boss; 302. Limiting hole; 4. Disc spring assembly; 5. Spring; 6. Valve disc; 7. Valve stem; 8. Adjusting handwheel; 81. Abutment part; 9. First nut; 10. Upper valve seat; 11. Valve cap; 12. Stop ring; 13. First O-ring; 14. Second O-ring; 15. Screw; 16. Second nut; 17. Sealing gasket; 18. Retaining ring; 19. Sealing bushing; 190. Connecting hole; 20. Sealing gasket copper sleeve; 1000. Valve body; 2000. Sealing assembly. Detailed Implementation

[0038] The present application will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all fall within the protection scope of the present application. Parts not described in detail in the following embodiments can be implemented using existing technology.

[0039] In the description of the embodiments of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are 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.

[0040] 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 with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0041] In the description of the embodiments in this application, "multiple" means two or more, unless otherwise explicitly specified. In this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or devices.

[0043] Currently used pressure relief valves often encounter several problems: limited installation height (high-pressure relief valves are too tall); non-adjustable pressure, resulting in limited applicability; and slow or jammed pressure relief processes. Based on these issues, this application provides a pressure relief valve with adjustable opening pressure to solve these problems.

[0044] Reference Figures 1 to 2 As shown in one embodiment of this application, a pressure relief valve with adjustable opening pressure includes a valve body 1000, a valve disc 6, a valve stem 7, a sealing assembly 2000, and an adjusting handwheel 8.

[0045] The valve disc 6 is sleeved on the outer peripheral wall of the valve stem 7 and located inside the valve body 1000 to limit the stroke of the valve stem 7; the sealing assembly 2000 is movably disposed inside the valve body 1000 to control the opening or closing of the pressure relief valve; one end of the valve stem 7 abuts against the adjusting handwheel 8, and the other end of the valve stem 7 moves inside the valve body 1000 under the drive of the adjusting handwheel 8, adjusting the distance between the other end of the valve stem 7 and the sealing assembly 2000 to adjust the opening pressure of the pressure relief valve.

[0046] Specifically, during the operation of the pressure relief valve, the valve disc 6 is sleeved on the outer peripheral wall of the valve stem 7 and located within the valve body 1000, guiding the valve stem 7 and limiting its stroke, ensuring that the direction and distance of movement of the valve stem 7 are within a set range. The sealing assembly 2000 is movably disposed within the valve body 1000 to control the opening or closing state of the pressure relief valve. When it is necessary to adjust the opening pressure of the pressure relief valve, the operator only needs to rotate the adjusting handwheel 8. One end of the valve stem 7 is connected to the adjusting handwheel 8. The other end of the valve stem 7 moves within the valve body 1000, causing a change in the distance between the valve stem 7 and the sealing assembly 2000. The opening pressure of the pressure relief valve is set by the distance between the valve stem 7 and the sealing assembly 2000. When the system pressure reaches the set opening pressure, the sealing assembly 2000 moves under pressure, and the pressure relief valve opens to release pressure. When the system pressure is lower than the set opening pressure, the sealing assembly 2000 resets, and the pressure relief valve closes, thereby achieving the adjustment and control of the opening pressure of the pressure relief valve.

[0047] In the above embodiments of this application, by adjusting the handwheel 8 to drive the valve stem 7 to move up and down within the valve body 1000, the distance between the valve stem 7 and the sealing assembly 2000 is adjusted, thereby achieving precise adjustment of the opening pressure of the pressure relief valve. This ensures that the system operates within a safe pressure range, avoiding safety accidents or equipment failures caused by excessively high or low pressure, and greatly improving the stability and safety of the system. At the same time, the valve disc 6 is sleeved on the outer peripheral wall of the valve stem 7 to guide the valve stem 7 and limit its stroke, ensuring the stability and reliability of the valve stem 7's movement, and further improving the overall performance of the pressure relief valve.

[0048] In some specific embodiments of this application, the valve body 1000 includes: valve cap 11, upper valve seat 10, lower valve seat 1 and guide sleeve 2.

[0049] The valve cap 11 is connected to one end of the upper valve seat 10, and one end of the valve disc 6 is located inside the upper valve seat 10, while the other end is located inside the valve cap 11. The guide sleeve 2 is located between the upper valve seat 10 and the lower valve seat 1, forming a receiving chamber. The outer circumferential wall of the adjusting handwheel 8 is threadedly connected to the inner wall of the valve cap 11, and the valve stem 7 is moved within the valve body 1000 by rotation. The lower valve seat 1 is provided with an air inlet 100, and the sealing assembly 2000 is movably located within the lower valve seat 1 to block the air inlet 100 when pressure is received.

[0050] Specifically, refer to Figure 2 As shown, a valve body 1000 is formed by connecting the valve cap 11, upper valve seat 10, guide sleeve 2, and lower valve seat 1. One end of the valve disc 6 is placed inside the upper valve seat 10, and the other end is located in the space enclosed by the valve cap 11. The outer peripheral wall of the adjusting handwheel 8 is connected to the inner wall of the valve cap 11 by a thread. When the operator rotates the adjusting handwheel 8, the adjusting handwheel 8 will drive the valve stem 7 to move within the valve body 1000 due to the transmission action of the thread, thereby adjusting the position of the valve stem 7. The lower valve seat 1 is provided with an air inlet 100. The sealing assembly 2000 is movably disposed inside the lower valve seat 1. In the initial state, the sealing assembly 2000 is basically not subjected to any other compressive force except for its own weight. When there is pressure in the air inlet 100, it will act on the bottom of the sealing assembly 2000 to form an upward force, and the sealing assembly 2000 will block the air inlet 100. When the system pressure changes to a certain condition, the sealing assembly 2000 will move, causing the air inlet 100 to open or close.

[0051] The valve stem 7 and valve disc 6 are connected by a first nut 9. The valve cap 11 and upper valve seat 10 are fixedly connected by screws 15 and a second nut 16.

[0052] Furthermore, the adjusting handwheel 8 and the valve stem 7 are provided with an abutment part 81. One end of the valve stem 7 can be inserted into the abutment part 81 when the adjusting handwheel 8 is rotated downward. Because a first nut 9 is provided, when the adjusting handwheel is rotated downward, the bottom of the abutment part 81 contacts the first nut 9, so that the valve stem 7 moves downward through the first nut 9. When the adjusting handwheel 8 is rotated upward, the valve stem 7 is reset by the spring 5.

[0053] In the above embodiments of this application, by adjusting the threaded connection between the handwheel 8 and the inner wall of the valve cap 11, the position of the valve stem 7 can be precisely adjusted by rotation, thereby adjusting the opening pressure of the pressure relief valve and achieving the effect of adjustable opening pressure of the pressure relief valve. The lower valve seat 1 is provided with an air inlet 100 and a sealing component 2000 that can move to block the air inlet 100. The opening or closing of the air inlet 100 can be controlled in a timely and accurate manner according to changes in system pressure, thereby achieving effective regulation of system pressure and improving the safety and stability of the system.

[0054] In some specific embodiments of this application, the pressure relief valve also includes a stop ring 12, which is disposed between the valve cap 11 and the adjusting handwheel 8 to limit the rotation angle of the adjusting handwheel 8 and prevent the adjusting handwheel 8 from rotating too much and coming off the valve cap 11.

[0055] In the above embodiments of this application, by setting a stop ring 12 to limit the rotation angle of the adjusting handwheel 8, it is prevented from exceeding the set rotation angle and dislodging from the valve cap 11 when the opening pressure of the pressure relief valve is set by adjusting the position of the first wheel adjusting valve rod 7, thereby improving the performance.

[0056] In some specific embodiments of this application, the pressure relief valve further includes a bushing 3 and a disc spring assembly 4; the bushing 3 and the disc spring assembly 4 are movably disposed in the receiving chamber; the bushing 3 is sleeved on the outer peripheral wall of the other end of the valve stem 7, and the disc spring assembly 4 is sleeved on the outer peripheral wall of the bushing 3, and the bushing 3 is used to restrict the movement of the disc spring assembly 4.

[0057] Specifically, by setting up bushing 3 and disc spring assembly 4 in the receiving chamber opposite to guide sleeve 2, the movement of disc spring assembly 4 is restricted by bushing 3, thereby improving the pressure relief effect of the pressure relief valve. Bushing 3 is used for the combined installation of disc spring assembly 4, and its length determines how many disc springs can be installed. With the addition of retaining ring 18, the movement of disc spring assembly 4 can be restricted.

[0058] It should be noted that the guide sleeve 2 is to ensure that the disc spring assembly 4 can contact the bottom of the upper valve seat 10 to form a spring force. Its height depends on the total height of the disc spring assembly 4 and is part of the housing.

[0059] The disc spring assembly 4 includes 5 disc springs (also known as disc washers), and the installation method adopts an odd number of disc springs paired together.

[0060] In some specific embodiments of this application, for the pressure relief valve, one end of the bushing 3 is provided with a boss 301 integrally formed with the bushing 3, and the other end is provided with a retaining ring 18; one end of the disc spring assembly 4 abuts against the retaining ring 18, and the other end of the disc spring assembly 4 abuts against one end face of the boss 301; the other end face of the bushing 3 with the boss 301 abuts against the sealing assembly 2000, and the bushing 3 moves under the push of the sealing assembly 2000, and the valve stem 7 extends out from the bushing 3 and abuts against the sealing assembly 2000.

[0061] Specifically, by setting a boss 301 at one end of the bushing 3 and a retaining ring 18 at the other end, the disc spring assembly 4 is located between the boss 301 and the retaining ring 18, restricting the movement of the disc spring assembly 4. At the same time, one end of the bushing 3 abuts against the sealing assembly 2000. After a certain pressure is generated at the air inlet 100, the sealing assembly 2000 is pushed to move. The sealing assembly 2000 pushes the bushing 3 to move, thereby compressing the disc spring assembly 4. During the movement of the bushing 3, the valve stem 7 can extend from the bushing 3 and abut against the sealing assembly 2000. After the pressure reaches a certain value, the valve stem 7 opens the sealing assembly 2000 to release pressure.

[0062] In some specific embodiments of this application, the pressure relief valve also includes a spring 5; there is a gap between the inner peripheral wall of the bushing 3 and the outer peripheral wall of the valve stem 7, the spring 5 is sleeved on the valve stem 7 and located in the gap, one end of the spring 5 abuts against the valve disc 6, and the other end is located in the bushing 3, for resetting the valve stem 7 when the adjusting handwheel 8 is rotated upward.

[0063] The disc spring assembly 4 is used to push the bushing 3 when the pressure decreases, and the bushing 3 pushes the sealing assembly 2000 to return it to its initial state.

[0064] It should be noted that the function of spring 5 is to adjust the spring force when handwheel 8 is rotated upwards, so that valve stem 7 returns to its original position.

[0065] Specifically, by setting a spring 5 between the valve stem 7 and the bushing 3, the extension and retraction of the spring 5 are adjusted when the distance between the valve stem 7 and the sealing assembly 2000 is adjusted by adjusting the handwheel 8. When the pressure for release is reached, the bushing 3 pushes the spring 5 and the disc spring assembly 4 to compress, and the valve stem 7 pushes open the sealing assembly 2000 to release pressure. After the release is completed, the spring 5 and the disc spring assembly 4 restore the valve stem 7 and the bushing 3 to their initial state through their own elasticity, thus closing the release.

[0066] In some specific embodiments of this application, the sealing assembly 2000 includes: a sealing gasket 17, a sealing bushing 19, and a sealing gasket copper sleeve 20.

[0067] The sealing gasket 17 is placed at one end of the sealing gasket copper sleeve 20, and the other end of the sealing gasket copper sleeve 20 blocks the air inlet 100; the sealing gasket 17 and the sealing gasket copper sleeve 20 are placed inside the sealing bushing 19; the sealing gasket copper sleeve 20 is pressed and sealed with the sealing bushing 19 by the sealing gasket 17, and under the action of external pressure, the sealing gasket copper sleeve 20 pushes the sealing bushing 19 to move.

[0068] Specifically, refer to Figure 2 As shown, during the operation of the sealing assembly 2000 of the pressure relief valve, the sealing gasket 17 is installed at one end of the sealing gasket copper sleeve 20 and located inside the sealing bushing 19. The other end of the sealing gasket copper sleeve 20 blocks the air inlet 100 of the lower valve seat 1. In the initial state, the sealing assembly 2000 is basically not subjected to any other compressive force except for its own weight. Once there is pressure at the air inlet, it will act on the bottom of the sealing gasket copper sleeve 20 to form an upward force. Through the sealing gasket 17 and the sealing bushing 19, the sealing effect is achieved, preventing the medium from leaking from the air inlet 100. Leakage; When the pressure inside the system changes, the external pressure continues to act on the sealing gasket copper sleeve 20 from the air inlet 100. Under the pressure, the sealing gasket copper sleeve 20 will drive the sealing gasket 17 to push the sealing bushing 19 to move. Since the force-bearing area of ​​the sealing gasket copper sleeve 20 is much larger than that of the sealing bushing 19, it always maintains a squeezed sealing state during the upward movement until the sealing gasket copper sleeve 20 contacts the valve stem 7 to change the sealing state, thereby realizing the opening or closing of the pressure relief valve to maintain the system pressure within a safe range.

[0069] Among them, the bushing 3 and the sealing bushing 19 also have a self-centering function, that is, they automatically make the center of the sealing bushing 19 coincide with the center of the bushing 3, ensuring that the two are in a coaxial state and avoiding eccentricity.

[0070] It should be noted that, under the condition that the opening pressure has not been reached, the sealing gasket copper sleeve 20 and the sealing gasket 17 are pushed upward by the gas pressure to move the sealing shaft sleeve 19 (the sealing gasket 17 and the sealing shaft sleeve 19 are squeezed to form a seal). When the opening pressure is reached, the sealing gasket copper sleeve 20 and the sealing gasket 17 are blocked by the valve stem and cannot continue to move upward, while the sealing shaft sleeve 19 continues to move upward, thus creating a gap between the two, causing the seal to fail and achieving the purpose of pressure relief.

[0071] In some specific embodiments of this application, for the pressure relief valve, one end of the sealing bushing 19 abuts against the end of the bushing with the boss 301; the end of the bushing 3 with the boss 301 is provided with a limiting hole 302, and the end of the sealing bushing 19 is provided with a connecting hole 190 opposite to the limiting hole 302, and the sealing gasket 17 seals the connecting hole 190.

[0072] When the air inlet 100 is subjected to external pressure, it first pushes the sealing assembly 2000 to achieve a seal. After the pressure continues to increase, the sealing gasket copper sleeve 20 pushes the sealing bushing 19 to move towards the valve stem 7, pushing the bushing 3 to move and compress the disc spring assembly 4 and the spring 5. The other end of the valve stem 7 extends into the limiting hole 302 and the connecting hole 190, pushing the sealing gasket copper sleeve 20, so that a gap is created between the sealing gasket copper sleeve 20 and the sealing bushing 19 to release pressure.

[0073] It should be noted that the sealing principle is that the sealing gasket 17 installed inside the sealing gasket copper sleeve 20 is pressed tightly against the sealing bushing 19. After air intake, the copper sleeve lifts the sealing bushing 19 and moves upward together, compressing the disc spring assembly 4. At this time, the seal is not open. When the disc spring assembly 4 reaches a certain deformation, the sealing gasket copper sleeve 20 touches the bottom of the valve stem 7, causing a gap between the sealing gasket copper sleeve 20 and the sealing bushing 19, resulting in seal failure and pressure release. The greater the initial distance between the valve stem 7 and the upper surface of the sealing gasket copper sleeve 20, the greater the required opening pressure.

[0074] In some specific embodiments of this application, for the pressure relief valve, a sealing groove 101 is provided between the lower valve seat 1 and the sealing sleeve 19, and a first O-ring 13 is provided in the sealing groove 101 to prevent gas from flowing out between the sealing sleeve 19 and the lower valve seat 1.

[0075] The lower valve seat 1 has a second O-ring 14 on the outer peripheral wall of the end with the air inlet 100, which is used to ensure that no gas leaks from the outside during the air intake process when the air inlet 100 of the lower valve seat 1 is connected to external equipment.

[0076] In the above embodiments of this application, a sealing groove 101 and a first O-ring 13 are provided between the lower valve seat 1 and the sealing sleeve 19. At the same time, a second O-ring 14 is provided on the outer peripheral wall of the lower valve seat 1 at the end where the air inlet 100 is located. The first O-ring 13 can effectively prevent gas from flowing out from the gap between the sealing sleeve 19 and the lower valve seat 1, avoiding the impact of internal gas leakage on the normal working performance of the pressure relief valve and the stability of the system pressure. The second O-ring 14 ensures that gas will not leak from the outside of the connection during the air intake process when the air inlet 100 of the lower valve seat 1 is connected to external equipment, ensuring the sealing of the connection between the system and the external equipment, and improving the safety, reliability and operating efficiency of the entire system.

[0077] The preferred features in the above embodiments can be used individually in any embodiment, or in any combination thereof, provided they do not conflict with each other. Furthermore, parts not described in detail in the embodiments can be implemented using existing technologies.

[0078] The foregoing has described some specific embodiments of this application. It should be understood that this application is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of this application. The above-described preferred features can be used in any combination without conflict.

Claims

1. A pressure relief valve with adjustable opening pressure, characterized in that include: Valve body, valve disc, valve stem, sealing assembly, and adjusting handwheel; The valve disc is sleeved on the outer peripheral wall of the valve stem and located in the valve body, and is used to limit the stroke of the valve stem; The sealing assembly is movably disposed within the valve body and is used to control the opening or closing of the pressure relief valve; One end of the valve stem abuts against the adjusting handwheel, and the other end of the valve stem moves within the valve body under the drive of the adjusting handwheel. Adjusting the distance between the other end of the valve stem and the sealing assembly adjusts the opening pressure of the pressure relief valve.

2. The pressure relief valve of claim 1, wherein, The valve body includes: a valve cap, an upper valve seat, a lower valve seat, and a guide sleeve; The valve cap is connected to one end of the upper valve seat, and one end of the valve disc is disposed inside the upper valve seat, while the other end is located inside the valve cap; The guide sleeve is disposed between the upper valve seat and the lower valve seat to form a receiving chamber; The outer circumferential wall of the adjusting handwheel is threadedly connected to the inner wall of the valve cap, and the rotation drives the valve stem to move within the valve body; The lower valve seat is provided with an air inlet, and the sealing assembly is movably disposed within the lower valve seat to block the air inlet when subjected to pressure.

3. A pressure relief valve according to claim 2, wherein The pressure relief valve also includes a stop ring disposed between the valve cap and the adjusting handwheel to limit the rotation angle of the adjusting handwheel and prevent the adjusting handwheel from rotating too much and coming off the valve cap.

4. The pressure relief valve of claim 2, wherein, The pressure relief valve also includes a bushing and a disc spring assembly; The bushing and the disc spring assembly are movably disposed within the receiving cavity; The bushing is fitted onto the outer peripheral wall of the other end of the valve stem, and the disc spring assembly is fitted onto the outer peripheral wall of the bushing. The bushing is used to restrict the movement of the disc spring assembly.

5. The pressure relief valve of claim 4, wherein, One end of the bushing is provided with a boss integrally formed with the bushing, and the other end is provided with a retaining ring; One end of the disc spring assembly abuts against the retaining ring, and the other end of the disc spring assembly abuts against one end face of the boss; The other end face of the bushing with the boss abuts against the sealing assembly. The bushing moves under the push of the sealing assembly, and the valve stem extends out from the bushing and abuts against the sealing assembly.

6. A pressure relief valve according to claim 5, wherein The pressure relief valve also includes a spring; There is a gap between the inner peripheral wall of the bushing and the outer peripheral wall of the valve stem. The spring is sleeved on the valve stem and located in the gap. One end of the spring abuts against the valve disc, and the other end is located in the bushing. It is used to reset the valve stem when the adjusting handwheel is rotated upward. The disc spring assembly is used to push the bushing when the pressure decreases, and the bushing pushes the sealing assembly to block the air inlet.

7. The pressure relief valve of claim 5, wherein the pressure relief valve is configured to adjust the opening pressure by adjusting the pressure of the fluid in the pressure chamber. The sealing assembly includes: a sealing gasket, a sealing bushing, and a copper sleeve for the sealing gasket; The sealing gasket is disposed at one end of the sealing gasket copper sleeve, and the other end of the sealing gasket copper sleeve blocks the air inlet; The sealing gasket and the sealing gasket copper sleeve are disposed inside the sealing bushing; The sealing gasket copper sleeve is pressed and sealed with the sealing shaft sleeve by the sealing gasket. Under the action of external pressure, the sealing gasket copper sleeve pushes the sealing shaft sleeve to move.

8. A pressure relief valve with adjustable opening pressure according to claim 7, characterized in that, One end of the sealing bushing abuts against the end of the bushing where the boss is located; The bushing with the boss has a limiting hole at one end, and the sealing bushing has a connecting hole at one end that is opposite to the limiting hole. The sealing gasket seals the connecting hole. When the air inlet is subjected to external pressure, it pushes the sealing assembly, which in turn pushes the bushing to move, thereby compressing the disc spring assembly and the spring. The other end of the valve stem extends into the limiting hole and the connecting hole, pushing the sealing gasket copper sleeve to create a gap between the sealing gasket copper sleeve and the sealing bushing, thus releasing pressure.

9. A pressure relief valve with adjustable opening pressure according to claim 7, characterized in that, A sealing groove is provided between the lower valve seat and the sealing bushing, and a first O-ring is provided in the sealing groove to prevent gas from flowing out between the sealing bushing and the lower valve seat.

10. A pressure relief valve with adjustable opening pressure according to claim 2, characterized in that, The lower valve seat has a second O-ring on the outer peripheral wall of the end where the air inlet is located, which is used to ensure that no gas leaks from the outside during the air intake process when the air inlet of the lower valve seat is connected to an external device.

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