Bidirectional composite type pressure control valve

Abstract

The utility model relates to fluid control equipment technical field, concretely is a kind of two-way composite type lift type pressure control valve, including valve body, still including the A interface and B interface respectively with the communication of valve body, A interface is communicated with the lower end of valve body, B interface is communicated with the side portion of valve body, valve body is provided with valve seat, A valve port is opened at valve seat, A valve group that can be blocked is provided at A valve port, A valve group only allows fluid to flow from A interface to B interface direction, B valve port is opened in A valve group, B valve group that can be blocked is provided at B valve port, B valve group only allows fluid to flow from B interface to A interface direction.The utility model is applied to oilfield oil well wellhead, and two different directions fluid can be controlled respectively one-way flow control.The utility model is characterized in that two valve cores are composite integrated structure, and its control direction is opposite, and this integrated structure simplifies the complexity of device, especially applicable to the fluid management scene needing two-way independent control.

Description

Technical Field

[0001] This utility model relates to the field of fluid control equipment technology, specifically a bidirectional composite lifting pressure control valve. Background Technology

[0002] In the existing technology, the check valve can only control the flow of fluid in one direction. Under special working conditions, if the fluid at both ends of the check valve needs to flow under a certain pressure, the existing check valve cannot meet the above requirements.

[0003] One specific scenario involves natural gas trapped in the casing of an oil well, with the concentration gradually increasing, which hinders normal well operation and affects crude oil production. The current approach is to connect the casing gas to the oil pipeline via a check valve to release the pressure.

[0004] However, when crude oil solidifies in the pipeline or a valve unexpectedly closes, high pressure can build up in the wellhead pipeline connected to the pipeline, causing equipment damage and safety accidents. It can also affect the release of natural gas from the well casing. Ordinary check valves can only control the pressure release of natural gas from the well casing to the pipeline; when the aforementioned unexpected situations occur, creating high pressure inside the pipeline, ordinary check valves cannot provide a release outlet for the pipeline.

[0005] In addition, various types of check valves are installed on oil wells, production equipment, and pipelines in the petroleum, chemical, and refining industries. According to safety production management regulations, check valves used in pipelines handling high-temperature, high-pressure, and corrosive media must be of metal structure, meaning both the valve core and valve port are made of metal. Currently, most check valves close the valve port through a reciprocating axial motion, meaning the valve core impacts the valve port when it closes. Due to the high pressure inside the pipeline, to reduce the deformation caused by the valve core impacting the valve port when closing, key structures of check valves are made of high-hardness metal materials. However, high-hardness metal materials are not corrosion-resistant, so check valves will rust after a period of use, causing incomplete valve closure or even failure.

[0006] One-way valves used in pipelines carrying corrosive media are fitted with corrosion-resistant plastic gaskets or soft seals using sealing rings. However, these non-metallic materials are susceptible to high temperatures and aging, and are easily damaged in media containing sand or other contaminants. Therefore, the gaskets or sealing rings have a short lifespan and require frequent replacement. These problems have long plagued production enterprises in the petroleum, chemical, and refining industries, affecting normal production and posing numerous safety hazards. Utility Model Content

[0007] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a bidirectional composite lifting pressure control valve that can control the unidirectional flow of fluids in two different directions.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0009] A bidirectional composite lift-type pressure control valve includes a valve body, and an A port and a B port respectively connected to the valve body. The A port is connected to the lower end of the valve body, and the B port is connected to the side of the valve body. A valve seat is provided in the valve body, and an A valve port is provided at the valve seat. An A valve group is provided at the A valve port, which can block it. The A valve group only allows fluid to flow from the A port to the B port. A B valve port is provided on the A valve group, and a B valve group is provided at the B valve port, which can block it. The B valve group only allows fluid to flow from the B port to the A port.

[0010] The A valve group slides within the inner wall of the valve body, and the B valve group slides within the A valve group, with the sliding direction of both valve groups being set along the axial direction of the valve body.

[0011] In the above structure, the bidirectional composite lift-type pressure control valve is mainly used at the wellhead of oilfield wells. It can control the flow of fluid in two different directions in one direction. When the oil pipeline is subjected to crude oil solidification or valve closure, causing the pressure in the oil pipeline to reach a certain value, this utility model can automatically open to release pressure, thus avoiding the occurrence of pressure buildup in the wellhead pipeline.

[0012] Specifically, the A valve group includes an A valve core, which includes a cylinder, side posts, and an annular component. The lower part of the cylinder is fixedly connected to multiple side posts that are evenly distributed in an annular shape around its center line. The side posts are provided to provide flow space for the fluid guided by the B valve group. The lower part of the side posts is fixedly connected to an annular component, which is located at the upper part of the A valve port, and the outer ring surface of the annular component can block the A valve port.

[0013] The B valve assembly includes a B valve core and a guide rod. The guide rod is fixedly connected to the upper part of the B valve core. The bottom inner side of the A valve core annular part is provided with a B valve port. The B valve core is located at the lower part of the B valve port and can block the B valve port.

[0014] A central column is fixedly disposed between the cylinder and the annular component of the valve core A. The central column is coaxial with the cylinder, and the guide rod is movably disposed inside the central column, which provides support for the guide rod.

[0015] The cylinder of valve A has a bushing hole in the middle. The upper end of the guide rod passes through the central column and is fixedly connected to the bushing. The bushing is movably disposed in the bushing hole.

[0016] The guide rod is externally fitted with a return spring and a shock-absorbing pad. The shock-absorbing pad is located on the upper end face of the central column, and the return spring is located between the bushing and the shock-absorbing pad.

[0017] Furthermore, valve group A can rotate while moving linearly relative to the valve body, and valve group B can rotate while moving linearly relative to valve group A. Both valve groups A and B can rotate while moving linearly to open or close, so that when closing the valve port, the valve group gradually approaches the valve port in a helical feeding manner, avoiding direct impact with the valve port and thus preventing deformation of the valve group and valve port. Moreover, for viscous media and media containing turbid impurities such as sand and iron filings, the valve group can utilize its helical movement to rotate and push the media and impurities at the valve port forward in a Tai Chi-like manner, closing the valve port. This avoids hard impact between the valve group and valve port and the impurities, while simultaneously rotating and pushing the impurities out, ensuring a tight seal.

[0018] There are two main ways to achieve a closed-loop valve group B:

[0019] First, a first pin is fixedly connected to the outside of the bushing, and a first spiral groove is opened in the bushing hole, with the first pin slidably disposed in the first spiral groove.

[0020] Secondly, the interior of the central column is provided with a second threaded groove, the guide rod is a screw structure, and the guide rod and the central column are configured as a ball screw nut pair.

[0021] Both of the above structures can achieve the goal of rotating the B valve core as the B valve core approaches or moves away from the B valve port.

[0022] A second pin is fixedly connected to the outer surface of the cylindrical body of valve core A, and a third helical groove is formed on the inner wall of the valve body, within which the second pin is slidably disposed. This structure enables valve core A to rotate as it approaches or moves away from valve port A.

[0023] A status indicator is provided on the top of the valve body. The status indicator includes an upper magnetic ring, a lower magnetic ring, a non-magnetic plate, a fixed post, and a sliding sleeve. The non-magnetic plate is fixedly connected to the top of the valve body. The fixed post is fixedly connected to the top of the non-magnetic plate. The sliding sleeve is movably sleeved on the outside of the fixed post. The sliding post is fixedly connected to the outside of the fixed post. A fourth helical slide is opened on the surface of the sliding sleeve. The sliding post slides in cooperation with the fourth helical slide. The lower part of the sliding sleeve is fixedly connected to the upper magnetic ring. The top of the cylinder of valve group A is fixedly connected to the lower magnetic ring. The upper and lower magnetic rings have the same polarity. A pointer is fixedly connected to the outside of the sliding sleeve.

[0024] In the above structure, when the fluid at port A pushes valve core A upward, the lower magnetic ring rises simultaneously with valve core A and approaches the top of the chamber. Since the upper and lower magnetic rings have the same polarity, according to the principle of magnetic repulsion, the upper magnetic ring is repelled and moves upward by the lower magnetic ring. At this time, the fourth helical slide, constrained by the sliding column, allows the sliding sleeve to rotate upward and drive the pointer to rotate. The pointer's indication indicates whether valve core A inside the valve body is open.

[0025] The beneficial effects achieved by this utility model are:

[0026] This invention is applied to the wellhead of an oilfield well, enabling unidirectional flow control of fluids flowing in two different directions. A key feature of this invention is that the two valve cores are a composite, integrated structure with opposite control directions. This integrated structure simplifies the complexity of the device and is particularly suitable for fluid management scenarios requiring bidirectional independent control.

[0027] The valve assembly structure of this invention can be controlled by sliding or by spiral sliding, which improves sealing performance and control accuracy. Its compact design and reliable performance provide a more efficient fluid control solution for oilfield development.

[0028] In addition, to facilitate observation of the valve core's operating status, a status indicator that indicates the valve core's opening and closing can be installed on the upper part of the pressure control valve. This status indicator is a modular structure installed on the outside of the pressure control valve and can be installed or removed according to the needs of the production scenario without changing or affecting the normal operation of the pressure control valve. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0030] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of valve group A in Embodiment 1 of this utility model;

[0032] Figure 3 This is a schematic diagram of the internal structure of valve group A in Embodiment 1 of this utility model;

[0033] Figure 4 This is a schematic diagram of the structure of valve group B in Embodiment 1 of this utility model;

[0034] Figure 5 This is a schematic diagram of the structure of valve group A and valve group B in Embodiment 1 of this utility model (with valve group B blocking valve port B).

[0035] Figure 6 This is a schematic diagram of the structure of valve group A and valve group B in Embodiment 1 of this utility model (with valve B port open);

[0036] Figure 7 This is a schematic diagram of the structure of Embodiment 2 of this utility model (with valve group A blocking valve port);

[0037] Figure 8 This is a schematic diagram of the structure of Embodiment 2 of this utility model (with valve A in the open state);

[0038] Figure 9 This is a schematic diagram of the structure of Embodiment 2 of this utility model (with valve B in the open state);

[0039] Figure 10 This is a scene diagram of the present invention installed at the oil wellhead;

[0040] Figure 11 This is a structural schematic diagram of Embodiment 3 of this utility model;

[0041] Figure 12 This is a schematic diagram of the structure of valve group A in embodiment three of this utility model;

[0042] Figure 13 This is a schematic diagram of the internal structure of valve group A in Embodiment 3 of this utility model;

[0043] Figure 14 This is a schematic diagram of the structure of valve group B in Embodiment 3 of this utility model;

[0044] Figure 15 This is a schematic diagram of the structure of valve group A and valve group B in embodiment three of this utility model (with valve group B blocking valve port B).

[0045] Figure 16 This is a schematic diagram of the structure of valve group A and valve group B in Embodiment 3 of this utility model (with valve B port open);

[0046] Figure 17 This is a schematic diagram of the structure of valve group A in embodiment four of this utility model;

[0047] Figure 18 This is a schematic diagram of the structure of valve group B in embodiment four of this utility model;

[0048] Figure 19 This is a schematic diagram of the structure of valve group A and valve group B in embodiment four of this utility model (with valve group B blocking valve port B).

[0049] Figure 20 This is a schematic diagram of the structure of valve group A and valve group B in embodiment four of this utility model (with valve B port open);

[0050] Figure 21 This is a structural schematic diagram of Embodiment 5 of this utility model.

[0051] In the diagram: 1. Valve body; 2. Cylinder; 3. Side post; 4. Middle post; 5. Annular part; 6. Third spiral groove; 7. Second pin; 8. A interface; 9. B interface; 10. B valve core; 11. A valve port; 12. Valve seat; 13. Bushing hole; 14. First spiral groove; 15. Through hole; 16. B valve port; 17. Guide rod; 18. Shock absorber; 19. Return spring; 20. Bushing; 21. First pin; 22. Fixing bolt; 23. Second threaded groove; 24. Non-magnetic plate; 25. Lower magnetic ring; 26. Upper magnetic ring; 27. Pointer; 28. Window; 29. ​​Sliding sleeve; 30. Sliding column; 31. Fourth spiral groove; 32. Fixing column; 33. Suction tubing; 34. Oil pipeline; 35. Wellhead; 36. Well casing. Detailed Implementation

[0052] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0053] Example 1:

[0054] like Figures 1-6 As shown, a bidirectional composite lift-type pressure control valve includes a valve body 1, and an A port 8 and a B port 9 respectively connected to the valve body 1. The A port 8 is connected to the lower end of the valve body 1, and the B port 9 is connected to the side of the valve body 1. A valve seat 12 is provided inside the valve body 1, and an A valve port 11 is provided at the valve seat 12. An A valve group capable of blocking the A valve port 11 is provided. The A valve group only allows fluid to flow from the A port 8 to the B port 9. A B valve port 16 is provided on the A valve group, and a B valve group capable of blocking the B valve port 16 is provided. The B valve group only allows fluid to flow from the B port 9 to the A port 8. The A valve group slides with the inner wall of the valve body 1, and the B valve group slides with the A valve group, and the sliding direction is set along the axial direction of the valve body 1.

[0055] Specifically, the A valve group includes an A valve core, which is slidably disposed inside the valve body 1. The A valve core includes a cylinder 2, side posts 3, and an annular component 5. The lower part of the cylinder 2 is fixedly connected to multiple side posts 3 that are evenly distributed in an annular shape around its center line. The side posts 3 are provided to provide flow space for the fluid guided by the B valve group. The lower part of the side posts 3 is fixedly connected to the annular component 5, which is disposed on the upper part of the A valve port 11. The outer ring surface of the annular component 5 can block the A valve port 11, and the contact surface between the two is an inclined surface.

[0056] The B valve assembly includes a B valve core 10 and a guide rod 17. The guide rod 17 is fixedly connected to the upper part of the B valve core 10. The bottom inner side of the A valve core annular part 5 is provided with a B valve port 16. The B valve core 10 is located at the lower part of the B valve port 16, and the B valve core 10 can block the B valve port 16.

[0057] A central column 4 is fixedly disposed between the cylinder 2 and the annular component 5 of the valve core A. The central column 4 and the inner annular surface of the annular component 5 are fixedly connected by multiple crossbars. The central column 4 and the cylinder 2 are coaxially disposed. The guide rod 17 is slidably disposed in the through hole 15 inside the central column 4. The central column 4 provides sliding guidance and support for the guide rod 17.

[0058] The cylinder 2 of valve core A has a bushing hole 13 in the middle. The upper end of the guide rod 17 passes through the central column 4 and is fixedly connected to the bushing 20. The bushing 20 is movably disposed in the bushing hole 13. The bushing 20 can be connected to the upper part of the guide rod 17 by fixing bolts 22. The position of the bushing 20 is adjustable, which makes it easy to adjust the initial position of valve group B, and then adjust the preset pressure of valve group B.

[0059] The guide rod 17 is externally fitted with a return spring 19 and a shock-absorbing pad 18. The shock-absorbing pad 18 is located on the upper end face of the central column 4, and the return spring 19 is located between the bushing 20 and the shock-absorbing pad 18.

[0060] The specific working principle of this utility model is as follows: when fluid enters through interface A 8, valve core A opens and drives valve core B 10 to rise together (e.g., Figure 8 As shown in the figure, when the fluid stops entering through port A 8, the valve core of valve A descends and closes port A 11 under the combined force of gravity and the reverse flow at port A 11.

[0061] When the fluid pressure entering through port B 9 exceeds the force of the return spring 19 of valve core B 10, the fluid passes through the gap between the side posts 3 of valve core A and pushes valve core B 10 open via the fluid channel (e.g., Figure 6 , Figure 9 (As shown). When the fluid stops entering through port B 9, valve core 10 closes port B 16 under the combined force of the return spring 19 and the reverse flow of the valve.

[0062] This invention is mainly applied to the wellhead of oil wells in oil fields. It can control the unidirectional flow of fluids in two different directions. When the oil pipeline 34 is subjected to crude oil solidification or valve closure, causing the pressure inside the oil pipeline 34 to reach a certain value, this invention can automatically open to release pressure, thus avoiding the occurrence of pressure buildup in the wellhead pipeline.

[0063] In practical applications, such as Figure 10As shown, the well casing 36 is located outside the sucker pipe 33, and the oil pipeline 34 is connected to the wellhead 35 of the sucker pipe 33. The two interfaces of this invention are respectively connected to the well casing 36 and the oil pipeline 34. When the gas pressure inside the well casing 36 is greater than the pressure in the oil pipeline 34, valve core A opens, and gas inside the well casing 36 enters through interface A 8, passes through the pressure control valve, and then enters the oil pipeline 34 to release the pressure. If the oil pipeline 34 experiences high pressure due to blockage or human error by closing a valve in the flow path, valve core B 10 opens, and crude oil enters through interface B 9, passes through the pressure control valve, and then enters the well casing 36 to release the pressure, thus preventing safety accidents.

[0064] Example 2:

[0065] like Figures 7-9 As shown, based on Embodiment 1, a status indicator is provided on the outer side of the top of the valve body 1. The status indicator includes an upper magnetic ring 26, a lower magnetic ring 25, a non-magnetic plate 24, a fixed post 32, and a sliding sleeve 29. The top of the valve body 1 is fixedly connected to the non-magnetic plate 24, and the top of the non-magnetic plate 24 is fixedly connected to the fixed post 32. The sliding sleeve 29 is movably sleeved on the outside of the fixed post 32, and the outside of the fixed post 32 is fixedly connected to the sliding post 30. A fourth spiral slide 31 is opened on the surface of the sliding sleeve 29. The sliding post 30 and the fourth spiral slide 31 slide in cooperation. The lower part of the sliding sleeve 29 is fixedly connected to the upper magnetic ring 26. The top of the cylinder 2 of valve group A is fixedly connected to the lower magnetic ring 25. The upper magnetic ring 26 and the lower magnetic ring 25 have the same polarity.

[0066] The sliding sleeve 29 is externally fixedly connected to a pointer 27.

[0067] The non-magnetic plate 24 can be made of non-magnetic materials such as stainless steel 304 or stainless steel 316. Both the upper magnetic ring 26 and the lower magnetic ring 25 are ring-shaped structures.

[0068] In the above structure, when the fluid at interface A 8 pushes valve core A upward, the lower magnetic ring 25 rises simultaneously with valve core A and approaches the top of the chamber (e.g., Figure 8 (As shown). Since the upper magnetic ring 26 and the lower magnetic ring 25 have the same polarity, according to the principle that like poles repel each other, the upper magnetic ring 26 is repelled by the lower magnetic ring 25 and moves upward. At this time, under the restriction of the sliding column 30, the fourth spiral slide 31 makes the sliding sleeve 29 only able to rotate and slide upward, driving the pointer 27 to rotate. By indicating the pointer 27, it can be known whether the valve core A inside the valve body 1 is open.

[0069] When fluid stops flowing into port A8, the valve core of valve A rotates and descends under the combined force of gravity and the reverse inrush force of port A8, closing valve port A11 (e.g., Figure 7 (As shown).

[0070] A transparent window 28 is provided on the top of the valve body 1. The transparent window 28 covers the outside of the status indicator. The transparent window 28 is made of transparent material, so as to facilitate observation of the position of the pointer 27 and determine the status of valve core A.

[0071] Example 3:

[0072] like Figures 11-16 As shown, this embodiment is basically the same as Embodiment 1, except that the A valve group can rotate while moving linearly relative to the valve body 1, and the B valve group can rotate while moving linearly relative to the A valve group. The A and B valve groups can rotate while moving linearly to open or close, so that when closing the valve port, the valve group gradually approaches the valve port in a helical feeding manner, avoiding direct impact with the valve port and thus preventing deformation of the valve group and valve port. Furthermore, for viscous media and turbid impurities such as sand and iron filings, the valve group can utilize its helical movement to rotate and push the medium and impurities at the valve port forward in a Tai Chi-like manner, closing the valve port. This avoids hard impact between the valve group and valve port and the impurities, while simultaneously rotating and pushing the impurities out, ensuring a tight seal.

[0073] Specifically, a second pin 7 is fixedly connected to the outer surface of the cylindrical body 2 of valve core A, and a third spiral groove 6 is formed on the inner wall of valve body 1, with the second pin 7 slidably disposed within the third spiral groove 6. This structure enables valve core A to rotate as it approaches or moves away from valve port 11.

[0074] Furthermore, the specific structure of valve group B is as follows: a first pin 21 is fixedly connected to the outside of the bushing 20, a first spiral groove 14 is opened on the inner wall of the bushing hole 13, and the first pin 21 is slidably disposed in the first spiral groove 14.

[0075] The above structure enables the valve core 10 to be near or far from the valve port 16 (e.g. Figure 15 , Figure 16 As shown, the guide rod 17 and the bushing 20 cause the valve core 10 B to rotate.

[0076] The specific working principle of this utility model is as follows: when fluid enters through interface A 8, valve core A opens and drives valve core B 10 to rise together (e.g., Figure 8 As shown), when the fluid stops entering through port A 8, the valve core of valve A rotates and descends under the combined force of gravity and the reverse flow at valve port A 11 to close valve port A 11.

[0077] When the fluid pressure entering through port B 9 exceeds the force of the return spring 19 of valve core B 10, the fluid passes through the gap between the side posts 3 of valve core A and pushes valve core B 10 open via the fluid channel (e.g., Figure 16 , Figure 9(As shown). Because the first pin 21 on the sleeve 20 of valve group B is embedded in the first spiral groove 14, when valve core 10 of B is opened, the first pin 21 rotates along the first spiral groove 14, causing valve core 10 of B to rotate and open. When fluid stops entering through port 9 of B, valve core 10 of B rotates and closes port 16 of B under the combined force of the return spring 19 and the reverse flow of the flow through port 16 of B.

[0078] Example 4:

[0079] The structure of this embodiment is basically the same as that of embodiment three, except that, as Figures 17-20 As shown, the B valve group's rotary closing mechanism is achieved using the following structure: The inner part of the central column 4 has a second threaded groove 23; the guide rod 17 is a lead screw structure; and ball bearings are provided between the guide rod 17 and the central column 4, thus forming a ball screw nut pair. This allows the guide rod 17 to rotate relative to the central column 4, thereby achieving the rotary closing or opening of the B valve core 10 (e.g., ...). Figure 19 , Figure 20 (As shown).

[0080] Based on the above structure, the bushing 20 and the bushing hole 13 are in a sliding fit.

[0081] Example 5:

[0082] like Figure 21 As shown, the structure of this embodiment is based on the structure of embodiment three or embodiment four, with the addition of a status indicator. The structure of the status indicator is the same as that in embodiment two.

Claims

1. A bidirectional composite lift-type pressure control valve, characterized in that, The valve body (1) includes an A port (8) and a B port (9) that are connected to the valve body (1) respectively. The A port (8) is connected to the lower end of the valve body (1), and the B port (9) is connected to the side of the valve body (1). A valve seat (12) is provided inside the valve body (1). An A valve port (11) is provided at the valve seat (12). An A valve group that can block the A valve port (11) is provided at the A valve port (11). The A valve group only allows fluid to flow from the A port (8) to the B port (9). A B valve port (16) is provided on the A valve group. A B valve group that can block the B valve port (16) is provided at the B valve port (16). The B valve group only allows fluid to flow from the B port (9) to the A port (8). The A valve group slides with the inner wall of the valve body (1), the B valve group slides with the A valve group, and the sliding direction is set along the axial direction of the valve body (1).

2. The bidirectional composite lifting pressure control valve according to claim 1, characterized in that, The A valve group includes an A valve core, which includes a cylinder (2), side posts (3) and an annular part (5). The lower part of the cylinder (2) is fixedly connected to multiple side posts (3) that are evenly distributed in an annular shape around its center line. The lower part of the side posts (3) is fixedly connected to the annular part (5). The annular part (5) is located on the upper part of the A valve port (11), and the outer ring surface of the annular part (5) can block the A valve port (11).

3. The bidirectional composite lifting pressure control valve according to claim 2, characterized in that, The B valve assembly includes a B valve core (10) and a guide rod (17). The guide rod (17) is fixedly connected to the upper part of the B valve core (10). The bottom inner side of the A valve core annular part (5) is provided with a B valve port (16). The B valve core (10) is located at the lower part of the B valve port (16), and the B valve core (10) can block the B valve port (16).

4. The bidirectional composite lifting pressure control valve according to claim 3, characterized in that, A central column (4) is fixedly arranged between the cylinder (2) and the annular part (5) of the valve core A. The central column (4) is coaxial with the cylinder (2), and the guide rod (17) is movably arranged inside the central column (4).

5. The bidirectional composite lifting pressure control valve according to claim 4, characterized in that, The cylinder (2) of valve core A has a bushing hole (13) in the middle. The upper end of the guide rod (17) passes through the central column (4) and is fixedly connected to the bushing (20). The bushing (20) is movably disposed in the bushing hole (13).

6. The bidirectional composite lift-type pressure control valve according to claim 5, characterized in that, The guide rod (17) is externally fitted with a return spring (19) and a shock absorber (18). The shock absorber (18) is located on the upper end face of the central column (4), and the return spring (19) is located between the bushing (20) and the shock absorber (18).

7. The bidirectional composite lift-type pressure control valve according to claim 6, characterized in that, The bushing (20) is externally fixedly connected to a first pin (21), and a first spiral groove (14) is provided in the bushing hole (13). The first pin (21) is slidably disposed in the first spiral groove (14).

8. The bidirectional composite lift-type pressure control valve according to claim 6, characterized in that, The inner part of the central column (4) is provided with a second threaded groove (23), and the guide rod (17) is a screw structure. The guide rod (17) and the central column (4) are configured as a ball screw nut pair.

9. The bidirectional composite lift-type pressure control valve according to any one of claims 2-8, characterized in that, The outer surface of the cylinder (2) of valve core A is fixedly connected with a second pin (7), and the inner wall of valve body (1) is provided with a third spiral groove (6), and the second pin (7) is slidably disposed in the third spiral groove (6).

10. The bidirectional composite lifting pressure control valve according to claim 2, characterized in that, A status indicator is provided on the top of the valve body (1). The status indicator includes an upper magnetic ring (26), a lower magnetic ring (25), a non-magnetic plate (24), a fixed column (32), and a sliding sleeve (29). The top of the valve body (1) is fixedly connected to the non-magnetic plate (24). The top of the non-magnetic plate (24) is fixedly connected to the fixed column (32). The sliding sleeve (29) is movably sleeved on the outside of the fixed column (32). The outside of the fixed column (32) is fixedly connected to the sliding column (30). The surface of the sliding sleeve (29) is provided with a fourth spiral slide (31). The sliding column (30) and the fourth spiral slide (31) slide together. The lower part of the sliding sleeve (29) is fixedly connected to the upper magnetic ring (26). The top of the cylinder (2) of valve group A is fixedly connected to the lower magnetic ring (25). The upper magnetic ring (26) and the lower magnetic ring (25) have the same polarity. The outside of the sliding sleeve (29) is fixedly connected to a pointer (27).

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