Damping valve
By designing the main valve, pilot valve, and switch structure of the shock-absorbing valve, the valve plug is moved by the medium pressure, realizing simultaneous pressure relief in the lower chamber and the third chamber. This solves the problems of small discharge capacity and slow response speed of existing pilot-operated safety valves, and improves the pressure relief speed and shock absorption effect.
Patent Information
- Application Number
- CN202511041847.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-28
- Publication Date
- 2025-11-14
AI Technical Summary
Existing pilot-operated safety valves have small discharge capacity and slow response speed, making it difficult to effectively prevent system or equipment damage caused by overpressure.
Design a shock-absorbing valve, including a main valve, a pilot valve and a switch, which drives the movement of the valve plug through the medium pressure to achieve simultaneous pressure relief in the lower chamber and the third chamber, quickly release the medium, and improve the discharge capacity and response speed.
By simultaneously depressurizing the lower chamber and the third chamber, the medium can be quickly released, which increases the discharge capacity and response speed of the damping valve and improves the damping effect.
Smart Images
Figure CN120946818A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of safety valve technology, and more specifically, to a shock-absorbing valve. Background Technology
[0002] A safety valve is a reclosable overpressure protection device that can use the pressure of the medium itself to discharge a rated flow of fluid, thereby relieving some of the pressure in pressure vessels, pressure pipelines, boilers, and other pressure-bearing devices and equipment, preventing damage to the system or equipment due to overpressure, and ensuring the normal operation of the device and equipment as well as the safety of the operators.
[0003] In related technologies, safety valves are typically pilot-operated safety valves, which generally consist of a main valve and a pilot valve. The main valve is driven by the medium discharged from the pilot valve. However, pilot-operated safety valves in related technologies have small discharge capacity and slow response speed. Summary of the Invention
[0004] The present invention aims to at least partially solve one of the technical problems in the related art. To this end, embodiments of the present invention provide a shock-absorbing valve.
[0005] The shock-absorbing valve of this invention includes:
[0006] The main valve has a first receiving cavity and a second receiving cavity, both of which contain a medium. The first receiving cavity has an outlet. The main valve is provided with a first valve plug, which is located between the first receiving cavity and the second receiving cavity and is movable.
[0007] A pilot valve has a first chamber, a second chamber, and a third chamber. The first chamber is connected to a first receiving chamber, and a medium in the first receiving chamber can enter the first chamber. The pilot valve is provided with a second valve plug, which has a first position and a second position. In the first position, the first chamber is connected to the second chamber, and in the second position, the second chamber is connected to the third chamber.
[0008] A switcher has an upper chamber and a lower chamber. The upper chamber is connected to a second chamber, and the medium in the upper chamber can be discharged from the third chamber. The lower chamber is connected to a first receiving chamber and a second receiving chamber, and the medium in the second receiving chamber can be discharged from the lower chamber. The switcher is provided with a third valve plug, which is located between the upper chamber and the lower chamber and is movable.
[0009] In this embodiment of the shock-absorbing valve, during pressure relief, the pressure of the medium in the first receiving cavity increases and can enter the first chamber. The pressure of the medium in the first chamber drives the second valve plug to the second position, so that the second chamber and the third chamber are connected. The medium in the upper chamber can enter the third chamber through the second chamber and be discharged from the third chamber to relieve pressure. The pressure of the medium in the upper chamber decreases. Under the action of the medium pressure in the lower chamber, the third valve plug moves towards the upper chamber. The medium in the second receiving cavity can be discharged from the lower chamber to relieve pressure. The pressure of the medium in the second receiving cavity decreases. Under the action of the medium pressure in the first receiving cavity, the first valve plug moves towards the second receiving cavity, so that the medium in the first receiving cavity can be discharged from the outlet to relieve pressure. As can be seen from the above, during pressure relief, the lower chamber and the third chamber are depressurized simultaneously, so that the medium in the second receiving cavity can be discharged quickly, and thus the medium in the first receiving cavity can be discharged quickly. The response speed is fast, which increases the discharge capacity of the shock-absorbing valve and improves the shock-absorbing effect.
[0010] In some embodiments, the shock-absorbing valve has a closed state and an open state.
[0011] In the closed state, the pressure of the medium in the first receiving cavity is the same as the pressure of the medium in the second receiving cavity, the second valve plug is located in the first position, and a portion of the medium in the first receiving cavity can sequentially enter the first chamber, the second chamber and the upper chamber, while the other portion of the medium in the first receiving cavity and the medium in the second receiving cavity can enter the lower chamber, and the pressure of the medium in the lower chamber is the same as the pressure of the medium in the upper chamber.
[0012] In the open state, the pressure of the medium in the first receiving chamber is greater than the pressure of the medium in the second receiving chamber, the second valve plug is located in the second position, the medium in the upper chamber enters the second chamber and the third chamber in sequence and is discharged from the third chamber, the third valve plug moves toward the upper chamber, and the medium in the second receiving chamber enters the lower chamber and is discharged from the lower chamber.
[0013] In some embodiments, the pilot valve is provided with an elastic element, one end of which is connected to the inner wall of the pilot valve, and the other end of which is connected to the second valve plug. In the first position, the pressure of the medium in the first chamber is equal to the elastic force of the elastic element, and in the second position, the pressure of the medium in the first chamber is greater than the elastic force of the elastic element.
[0014] In some embodiments, the pilot valve has a first opening, a second opening, and a third opening. The first receiving cavity communicates with the first chamber through the first opening, the second chamber communicates with the upper cavity through the second opening, and the third opening communicates with the third chamber. The medium in the third chamber can be discharged through the third opening.
[0015] In some embodiments, the lower cavity includes a first sub-cavity and a second sub-cavity, the first sub-cavity being in communication with the first receiving cavity, the second sub-cavity being in communication with the first sub-cavity in the closed state, and the second sub-cavity being spaced apart from the first sub-cavity and in communication with the second receiving cavity in the open state.
[0016] In some embodiments, the switch has an upper opening, a lower opening, and a discharge port. The upper opening connects the upper cavity and the second opening, the lower opening connects the first sub-chamber and the first receiving cavity, and the discharge port connects to the second sub-chamber, through which the medium in the second sub-chamber can be discharged.
[0017] In some embodiments, the damping valve further includes:
[0018] A first conduit, the first conduit connecting the first receiving cavity and the first opening;
[0019] The second conduit connects the second opening and the upper opening;
[0020] A third conduit connects the first receiving cavity and the lower opening;
[0021] A fourth conduit connects the second sub-chamber and the second receiving cavity.
[0022] In some embodiments, the main valve has an inlet chamber and an outlet chamber, both of which are in communication with the first receiving cavity. In the closed state, the first valve plug is used to block the inlet chamber and the first receiving cavity. In the open state, the first valve plug moves toward the second receiving cavity, the inlet chamber is in communication with the first receiving cavity, the medium can enter the first receiving cavity through the inlet chamber, and the medium in the first receiving cavity can be discharged through the outlet chamber.
[0023] In some embodiments, the pilot valve has a first sealing portion and a second sealing portion, the first sealing portion being located between the first chamber and the second chamber, and the second sealing portion being located between the second chamber and the third chamber. In the closed state, at least a portion of the second valve plug is located in the second sealing portion to seal the second chamber and the third chamber. In the open state, at least a portion of the second valve plug is located in the first sealing portion to seal the first chamber and the second chamber.
[0024] In some embodiments, the switcher further includes an upper sealing portion and a lower sealing portion, the upper sealing portion being located between the first sub-chamber and the second sub-chamber, and the lower sealing portion being located at the outlet. In the closed state, the third valve plug is used to block the outlet. In the open state, the third valve plug is located at the upper sealing portion to block the first sub-chamber and the second sub-chamber. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the shock-absorbing valve in the closed state according to an embodiment of the present invention.
[0026] Figure 2 This is a schematic diagram of the shock-absorbing valve in the open state according to an embodiment of the present invention.
[0027] Reference numerals: 1. Main valve; 11. First receiving chamber; 111. Outlet; 12. Second receiving chamber; 13. First valve plug; 14. Inlet chamber; 15. Outlet chamber; 2. Pilot valve; 21. First chamber; 22. Second chamber; 23. Third chamber; 24. Second valve plug; 26. First opening; 27. Second opening; 28. Third opening; 291. First sealing part; 292. Second sealing part; 3. Switch; 31. Upper chamber; 32. Lower chamber; 321. First sub-chamber; 322. Second sub-chamber; 33. Third valve plug; 34. Upper opening; 35. Lower opening; 36. Discharge outlet; 371. Upper sealing part; 372. Lower sealing part; 4. Elastic element; 51. First pipeline; 52. Second pipeline; 53. Third pipeline; 54. Fourth pipeline. Detailed Implementation
[0028] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0029] like Figure 1 and Figure 2 As shown, the shock-absorbing valve of this embodiment includes a main valve 1, a pilot valve 2, and a switch 3. The main valve 1 has a first receiving cavity 11 and a second receiving cavity 12, both of which contain a medium. The first receiving cavity 11 has an outlet 111. A first valve plug 13 is provided in the main valve 1, which is located between the first receiving cavity 11 and the second receiving cavity 12 and is movable.
[0030] The pilot valve 2 has a first chamber 21, a second chamber 22 and a third chamber 23. The first chamber 21 is connected to the first receiving chamber 11. The medium in the first receiving chamber 11 can enter the first chamber 21. The pilot valve 2 is provided with a second valve plug 24. The second valve plug 24 has a first position and a second position. In the first position, the first chamber 21 is connected to the second chamber 22. In the second position, the second chamber 22 is connected to the third chamber 23.
[0031] The switcher 3 has an upper chamber 31 and a lower chamber 32. The upper chamber 31 is connected to the second chamber 22. The medium in the upper chamber 31 can be discharged from the third chamber 23. The lower chamber 32 is connected to the first receiving chamber 11 and the second receiving chamber 12. The medium in the second receiving chamber 12 can be discharged from the lower chamber 32. The switcher 3 is provided with a third valve plug 33, which is located between the upper chamber 31 and the lower chamber 32 and is movable.
[0032] In this embodiment of the shock-absorbing valve, during pressure relief, the pressure of the medium in the first receiving cavity 11 increases and can enter the first chamber 21. The pressure of the medium in the first chamber 21 drives the second valve plug 24 to a second position, so that the second chamber 22 communicates with the third chamber 23. The medium in the upper chamber 31 can enter the third chamber 23 through the second chamber 22 and be discharged from the third chamber 23 to relieve pressure. The pressure of the medium in the upper chamber 31 decreases, and the third valve plug 33 moves toward the upper chamber 31 under the action of the medium pressure in the lower chamber 32. The medium can be discharged and depressurized through the lower chamber 32. The pressure of the medium in the second receiving chamber 12 decreases. Under the action of the medium pressure in the first receiving chamber 11, the first valve plug 13 moves toward the second receiving chamber 12, so that the medium in the first receiving chamber 11 can be discharged and depressurized from the outlet 111. As can be seen from the above, when depressurizing, the lower chamber 32 and the third chamber 23 depressurize simultaneously, so that the medium in the second receiving chamber 12 can be discharged quickly, and thus the medium in the first receiving chamber 11 can be discharged quickly. The response speed is fast, which increases the discharge capacity of the shock-absorbing valve and improves the shock absorption effect.
[0033] Specifically, one end of the second valve plug 24 is located in the first chamber 21, and the other end of the second valve plug 24 passes through the second chamber 22 and is located in the third chamber 23. In the first position, the other end of the second valve plug 24 blocks the passage between the second chamber 22 and the third chamber 23. When the pressure of the medium in the first chamber 21 increases, the medium in the first chamber 21 can push one end of the second valve plug 24 toward the second chamber 22, so that the second valve plug 24 is in the second position, where one end of the second valve plug 24 blocks the passage between the first chamber 21 and the second chamber 22, and the second chamber 22 communicates with the third chamber 23.
[0034] In some embodiments, the damping valve has a closed state and an open state.
[0035] In the closed state, the pressure of the medium in the first receiving chamber 11 is the same as the pressure of the medium in the second receiving chamber 12, the second valve plug 24 is in the first position, and part of the medium in the first receiving chamber 11 can enter the first chamber 21, the second chamber 22 and the upper chamber 31 in sequence, and the other part of the medium in the first receiving chamber 11 and the medium in the second receiving chamber 12 can enter the lower chamber 32. The pressure of the medium in the lower chamber 32 is the same as the pressure of the medium in the upper chamber 31.
[0036] Specifically, in the closed state, the medium pressure in the first receiving chamber 11 is the same as the medium pressure in the second receiving chamber 12, and the medium pressure in the upper chamber 31 is the same as the medium pressure in the lower chamber 32, so that the first valve plug 13, the second valve plug 24 and the third valve plug 33 can remain stable.
[0037] In the open state, the pressure of the medium in the first receiving chamber 11 is greater than the pressure of the medium in the second receiving chamber 12. The second valve plug 24 is in the second position. The medium in the upper chamber 31 enters the second chamber 22 and the third chamber 23 in sequence and is discharged from the third chamber 23. The third valve plug 33 moves toward the upper chamber 31. The medium in the second receiving chamber 12 enters the lower chamber 32 and is discharged from the lower chamber 32.
[0038] Specifically, in the open state, a medium is introduced into the first receiving cavity 11, increasing the pressure of the medium in the first receiving cavity 11. The medium in the first receiving cavity 11 can enter the first chamber 21, increasing the pressure of the medium in the first chamber 21 and driving the second valve plug 24 to move toward the second chamber 22. The first chamber 21 is closed, and the second chamber 22 is connected to the third chamber 23. The medium in the upper chamber 31 can sequentially enter the second chamber 22 and the third chamber 23 and be discharged from the third chamber 23. The pressure of the medium in the upper chamber 31 decreases, and the third valve plug 33 moves toward the upper chamber 31. The medium in the second receiving cavity 12 enters the lower chamber 32 and is discharged from the lower chamber 32. The pressure of the medium in the second receiving cavity 12 decreases, and the first valve plug 13 moves toward the second receiving cavity 12. The medium in the first chamber 21 is discharged from the outlet 111.
[0039] In some embodiments, the pilot valve 2 is provided with an elastic element 4. One end of the elastic element 4 is connected to the inner wall surface of the pilot valve 2, and the other end of the elastic element 4 is connected to the second valve plug 24. In the first position, the pressure of the medium in the first chamber 21 is equal to the elastic force of the elastic element 4. In the second position, the pressure of the medium in the first chamber 21 is greater than the elastic force of the elastic element 4.
[0040] Specifically, in the closed state, the second valve plug 24 is in the first position, and the first chamber 21, the second chamber 22, and the upper chamber 31 are connected. The pressure of the medium in the first chamber 21 is balanced with the elastic force of the elastic element 4. In the open state, the pressure of the medium in the first chamber 21 increases, and the pressure of the medium in the first chamber 21 is greater than the elastic force of the elastic element 4. The pressure of the medium in the first chamber 21 drives the second valve plug 24 to the second position, thereby closing the first chamber 21 and connecting the second chamber 22 with the third chamber 23.
[0041] In some embodiments, the pilot valve 2 has a first opening 26, a second opening 27, and a third opening 28. A first receiving cavity 11 communicates with a first chamber 21 through the first opening 26, allowing media within the first receiving cavity 11 to enter the first chamber 21 through the first opening 26. A second chamber 22 communicates with an upper chamber 31 through the second opening 27, allowing media within the upper chamber 31 to enter the second chamber 22 through the second opening 27. A third opening 28 communicates with a third chamber 23, allowing media within the third chamber 23 to be discharged through the third opening 28.
[0042] In some embodiments, the lower cavity 32 includes a first sub-cavity 321 and a second sub-cavity 322. The first sub-cavity 321 is in communication with the first receiving cavity 11. In the closed state, the second sub-cavity 322 is in communication with the first sub-cavity 321. In the open state, the second sub-cavity 322 is spaced apart from the first sub-cavity 321 and is in communication with the second receiving cavity 12.
[0043] Specifically, one end of the third valve plug 33 is located in the first sub-chamber 321, and the other end of the third valve plug 33 is located in the second sub-chamber 322.
[0044] In some embodiments, the switch 3 has an upper opening 34, a lower opening 35, and a discharge port 36. The upper opening 34 connects the upper chamber 31 and the second opening 27, allowing the medium in the upper chamber 31 to enter the second chamber 22 through the upper opening 34 and the second opening 27. The lower opening 35 connects the first sub-chamber 321 and the first receiving chamber 11, allowing the medium in the first receiving chamber 11 to enter the second sub-chamber 322 through the lower opening 35, thereby increasing the pressure of the medium in the second sub-chamber 322 and enabling the medium in the second sub-chamber 322 to drive the third valve plug 33 to move toward the upper chamber 31. The discharge port 36 connects to the second sub-chamber 322, allowing the medium in the second sub-chamber 322 to be discharged through the discharge port 36.
[0045] In some embodiments, the damping valve further includes a first conduit 51, a second conduit 52, a third conduit 53, and a fourth conduit 54. The first conduit 51 connects the first receiving cavity 11 and the first opening 26, allowing the medium in the first receiving cavity 11 to enter the first chamber 21 through the first conduit 51. The second conduit 52 connects the second opening 27 and the upper opening 34, allowing the medium in the upper chamber 31 to enter the second chamber 22 through the second conduit 52. The third conduit 53 connects the first receiving cavity 11 and the lower opening 35, allowing the medium in the first receiving cavity 11 to enter the first sub-chamber 321 through the third conduit 53. The fourth conduit 54 connects the second sub-chamber 322 and the second receiving cavity 12, allowing the medium in the second receiving cavity 12 to enter the second sub-chamber 322 through the fourth conduit 54.
[0046] In some embodiments, the main valve 1 has an inlet cavity 14 and an outlet cavity 15, both of which are in communication with the first receiving cavity 11. In the closed state, the first valve plug 13 is used to block the inlet cavity 14 and the first receiving cavity 11. In the open state, the first valve plug 13 moves toward the second receiving cavity 12, the inlet cavity 14 communicates with the first receiving cavity 11, the medium can enter the first receiving cavity 11 through the inlet cavity 14, and the medium in the first receiving cavity 11 can be discharged through the outlet cavity 15.
[0047] Specifically, the outlet 111 of the first receiving cavity 11 is formed in the exiting oral cavity 15.
[0048] In some embodiments, the pilot valve 2 has a first sealing portion 291 and a second sealing portion 292. The first sealing portion 291 is located between a first chamber 21 and a second chamber 22, and the second sealing portion 292 is located between the second chamber 22 and a third chamber 23. In the closed state, at least a portion of the second valve plug 24 is located in the second sealing portion 292 to seal the second chamber 22 and the third chamber 23. In the open state, at least a portion of the second valve plug 24 is located in the first sealing portion 291 to seal the first chamber 21 and the second chamber 22.
[0049] In some embodiments, the switch 3 has an upper sealing portion 371 and a lower sealing portion 372. The upper sealing portion 371 is located between the first sub-chamber 321 and the second sub-chamber 322, and the lower sealing portion 372 is located at the outlet 36. In the closed state, the third valve plug 33 is used to block the outlet 36, and in the open state, the third valve plug 33 is located at the upper sealing portion 371 to block the first sub-chamber 321 and the second sub-chamber 322.
[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, 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 this invention.
[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0052] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0053] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0054] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0055] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.
Claims
1. A shock-absorbing valve, characterized in that, include: The main valve (1) has a first receiving cavity (11) and a second receiving cavity (12), both of which contain a medium. The first receiving cavity (11) has an outlet (111). The main valve (1) is provided with a first valve plug (13), which is located between the first receiving cavity (11) and the second receiving cavity (12) and is movable. A pilot valve (2) has a first chamber (21), a second chamber (22) and a third chamber (23). The first chamber (21) is connected to the first receiving chamber (11). The medium in the first receiving chamber (11) can enter the first chamber (21). The pilot valve (2) is provided with a second valve plug (24). The second valve plug (24) has a first position and a second position. In the first position, the first chamber (21) is connected to the second chamber (22). In the second position, the second chamber (22) is connected to the third chamber (23). A switcher (3) has an upper chamber (31) and a lower chamber (32). The upper chamber (31) is connected to the second chamber (22). The medium in the upper chamber (31) can be discharged from the third chamber (23). The lower chamber (32) is connected to the first receiving chamber (11) and the second receiving chamber (12). The medium in the second receiving chamber (12) can be discharged from the lower chamber (32). A third valve plug (33) is provided in the switcher (3). The third valve plug (33) is located between the upper chamber (31) and the lower chamber (32) and is movable.
2. The shock-absorbing valve according to claim 1, characterized in that, The shock-absorbing valve has a closed state and an open state. In the closed state, the pressure of the medium in the first receiving cavity (11) is the same as the pressure of the medium in the second receiving cavity (12), the second valve plug (24) is located in the first position, and part of the medium in the first receiving cavity (11) can sequentially enter the first chamber (21), the second chamber (22) and the upper chamber (31), and the other part of the medium in the first receiving cavity (11) and the medium in the second receiving cavity (12) can enter the lower chamber (32), and the pressure of the medium in the lower chamber (32) is the same as the pressure of the medium in the upper chamber (31); In the open state, the pressure of the medium in the first receiving chamber (11) is greater than the pressure of the medium in the second receiving chamber (12), the second valve plug (24) is located in the second position, the medium in the upper chamber (31) sequentially enters the second chamber (22) and the third chamber (23) and is discharged from the third chamber (23), the third valve plug (33) moves toward the upper chamber (31), and the medium in the second receiving chamber (12) enters the lower chamber (32) and is discharged from the lower chamber (32).
3. The shock-absorbing valve according to claim 1, characterized in that, The pilot valve (2) is provided with an elastic element (4). One end of the elastic element (4) is connected to the inner wall of the pilot valve (2), and the other end of the elastic element (4) is connected to the second valve plug (24). In the first position, the pressure of the medium in the first chamber (21) is equal to the elastic force of the elastic element (4). In the second position, the pressure of the medium in the first chamber (21) is greater than the elastic force of the elastic element (4).
4. The shock-absorbing valve according to claim 2, characterized in that, The pilot valve (2) has a first opening (26), a second opening (27) and a third opening (28). The first receiving cavity (11) is connected to the first chamber (21) through the first opening (26). The second chamber (22) is connected to the upper chamber (31) through the second opening (27). The third opening (28) is connected to the third chamber (23). The medium in the third chamber (23) can be discharged through the third opening (28).
5. The shock-absorbing valve according to claim 4, characterized in that, The lower cavity (32) includes a first sub-cavity (321) and a second sub-cavity (322). The first sub-cavity (321) is connected to the first receiving cavity (11). In the closed state, the second sub-cavity (322) is connected to the first sub-cavity (321). In the open state, the second sub-cavity (322) is spaced apart from the first sub-cavity (321) and is connected to the second receiving cavity (12).
6. The shock-absorbing valve according to claim 5, characterized in that, The switch (3) has an upper opening (34), a lower opening (35) and a discharge port (36). The upper opening (34) connects the upper cavity (31) and the second opening (27). The lower opening (35) connects the first sub-cavity (321) and the first receiving cavity (11). The discharge port (36) connects to the second sub-cavity (322). The medium in the second sub-cavity (322) can be discharged through the discharge port (36).
7. The shock-absorbing valve according to claim 6, characterized in that, Also includes: The first conduit (51) connects the first receiving cavity (11) and the first opening (26); The second conduit (52) connects the second opening (27) and the upper opening (34); The third pipe (53) connects the first receiving cavity (11) and the lower opening (35); The fourth conduit (54) connects the second sub-chamber (322) and the second receiving cavity (12).
8. The shock-absorbing valve according to claim 2, characterized in that, The main valve (1) has an inlet cavity (14) and an outlet cavity (15). Both the inlet cavity (14) and the outlet cavity (15) are connected to the first receiving cavity (11). In the closed state, the first valve plug (13) is used to block the inlet cavity (14) and the first receiving cavity (11). In the open state, the first valve plug (13) moves toward the second receiving cavity (12). The inlet cavity (14) is connected to the first receiving cavity (11). The medium can enter the first receiving cavity (11) through the inlet cavity (14), and the medium in the first receiving cavity (11) can be discharged through the outlet cavity (15).
9. The shock-absorbing valve according to claim 2, characterized in that, The pilot valve (2) has a first sealing portion (291) and a second sealing portion (292). The first sealing portion (291) is located between the first chamber (21) and the second chamber (22), and the second sealing portion (292) is located between the second chamber (22) and the third chamber (23). In the closed state, at least a portion of the second valve plug (24) is located in the second sealing portion (292) to block the second chamber (22) and the third chamber (23). In the open state, at least a portion of the second valve plug (24) is located in the first sealing portion (291) to block the first chamber (21) and the second chamber (22).
10. The shock-absorbing valve according to claim 6, characterized in that, The switch (3) also has an upper sealing part (371) and a lower sealing part (372), the upper sealing part (371) being located between the first sub-chamber (321) and the second sub-chamber (322), and the lower sealing part (372) being located at the outlet (36). In the closed state, the third valve plug (33) is used to block the outlet (36). In the open state, the third valve plug (33) is located at the upper sealing part (371) to block the first sub-chamber (321) and the second sub-chamber (322).