bidirectional composite axial flow pressure control valve

Abstract

This utility model relates to the field of fluid control equipment technology, specifically a bidirectional composite axial flow pressure control valve. It includes a valve body, and ports A and B respectively connected to the valve body. Ports A and B are located at opposite ends of the valve body. A valve seat is located within the valve body, and port A is provided at the valve seat. Port A is equipped with a valve assembly capable of sealing it, allowing fluid to flow only from port A to port B. Port B is also provided on the valve assembly, equipped with a valve assembly capable of sealing it, allowing fluid to flow only from port B to port A. This utility model is applied to oil wellheads in oil fields, employing a composite integrated structure that allows for simultaneous, independent reverse control of fluids flowing in two different directions. This design significantly simplifies the device structure by integrating mutually opposing control valve cores into a single unit, solving the problem of complex structures in traditional bidirectional fluid control systems.

Description

Technical Field

[0001] This utility model relates to the field of fluid control equipment technology, specifically a bidirectional composite axial flow 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] Specifically, one scenario involves oil well casings containing natural gas, with the concentration gradually increasing, which hinders normal well operation and impacts crude oil production. Currently, the gas in the casing is connected to the oil pipeline via a check valve to release pressure. However, when crude oil solidifies in the pipeline or the valve unexpectedly closes, high pressure buildup in the wellhead pipeline connected to the oil pipeline can cause equipment damage and safety accidents. Simultaneously, it also affects the release of natural gas from the casing. Ordinary check valve structures can only control the release of pressure from natural gas in the casing to the pipeline; when the aforementioned unforeseen circumstances occur, creating high pressure inside the pipeline, ordinary check valve structures cannot provide a release outlet for the pipeline.

[0004] 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 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 closure or even failure. Check valves used in corrosive media pipelines are fitted with corrosion-resistant plastic gaskets or soft seals using sealing rings. However, because these non-metallic materials are not heat-resistant and are prone to aging, and are easily damaged in media containing sand and other contaminants, the gaskets or sealing rings have a short service life and need frequent replacement. The above-mentioned problems have long plagued production enterprises in the petroleum, chemical, and refining industries, not only affecting normal production but also posing numerous safety hazards. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a bidirectional composite axial flow pressure control valve that can control the unidirectional flow of fluids in two different directions.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A bidirectional composite axial flow pressure control valve includes a valve body and an A port and a B port respectively connected to the valve body. The A port and the B port are respectively located at both ends of the valve body. A valve seat is provided in the valve body. An A valve port is provided at the valve seat. An A valve group is configured to block the A valve port. 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. A B valve group is configured to block the B valve port. The B valve group only allows fluid to flow from the B port to the A port.

[0008] A support rod is fixedly installed inside the valve body. A bushing is fixedly connected to the support rod. The bushing is arranged along the axial direction of the valve body. One end of the bushing is threadedly connected to an A-pressure control cap. The A-pressure control cap can seal this end of the bushing. The other end of the bushing is slidably sleeved with an A-valve assembly. An A-reset spring is provided between the A-valve assembly and the A-pressure control cap.

[0009] The B valve group is in sliding engagement with the A valve group, and a B return spring is provided between the B valve group and the A valve group.

[0010] In the above structure, the bidirectional composite axial flow pressure control valve is mainly used at the wellhead of oilfield wells. It can control the unidirectional flow of fluid in two different directions. When the fluid pressure in the two different directions can overcome the elastic force of the A return spring or the B return spring, the fluid in that direction can be opened to achieve unidirectional flow in that direction. When the pressure decreases, the A return spring or the B return spring can be reset.

[0011] The pressure control cap A is threadedly connected to the bushing, which allows adjustment of the feed length of the pressure control cap A relative to the bushing, thereby adjusting the preset pressure of the return spring A, and consequently adjusting the opening pressure of the valve group A.

[0012] Specifically, the A valve assembly includes an A valve core, which has an annular structure. The outer annular surface of the A valve core can block the A valve port. The inner annular surface of the A valve core is provided with a B valve port. Furthermore, the inner annular surface of the A valve core is fixedly connected to a concentrically arranged A sliding shaft via a support rod. The A sliding shaft is slidably sleeved inside the bushing.

[0013] To further optimize the structure, an A-shock-absorbing pad is provided inside the A-pressure control cap. The end of the A-sliding shaft near the A-pressure control cap is set as an end, the diameter of which is smaller than that of the A-sliding shaft. An A-reset spring is sleeved on the outside of the end, and one end of the A-reset spring is close to the A-shock-absorbing pad.

[0014] A ball-head plunger is fixedly connected to the inner surface of the bushing, and a first helical groove is provided on the outer surface of the sliding shaft A, with the ball-head plunger slidingly engaged with the first helical groove.

[0015] The above structure enables the A valve group to rotate while moving linearly relative to the valve body. Thus, when closing the A valve port, the A valve group gradually approaches the A valve port in a spiral feed manner, avoiding direct impact of the A valve group on the A valve port and thus preventing deformation of the A valve group and the A valve port.

[0016] The center of the A sliding shaft has a guide hole and a bushing hole that are interconnected. The guide hole and bushing hole are set in a stepped structure. The B valve group includes a B valve core, which is a circular plate. Its outer surface can seal the B valve port. The B valve core is concentrically fixedly connected to the B sliding shaft. The B sliding shaft is slidably disposed in the guide hole and bushing hole. The end of the B sliding shaft away from the B valve core is threadedly connected to a B pressure control cap. The B sliding shaft is externally sleeved with a B shock absorber and a B return spring. The B shock absorber and the B return spring are disposed between the B pressure control cap and the end face of the bushing hole.

[0017] Furthermore, the B valve group can rotate while moving linearly relative to the A valve group, specifically adopting the following two structural forms:

[0018] First, a second spiral groove is provided on the inner surface of the bushing hole, and an annular sleeve is axially slidably fitted on the outer side of the B sliding shaft. A pin is fixedly connected to the outer edge of the annular sleeve, and the pin slides in conjunction with the second spiral groove.

[0019] The ring is positioned between the B return spring and the B pressure control cap, and the ring is connected to the B sliding shaft via a flat key.

[0020] Secondly, the guide hole is configured as a threaded hole, the B sliding shaft is configured as a lead screw structure, and the B sliding shaft and the guide hole are configured as a ball screw nut pair.

[0021] The mating surface between valve core A and valve port A is an inclined surface, and the mating surface between valve core B and valve port B is an inclined surface.

[0022] To facilitate external observation of the operating status of the two valve cores and the opening / closing of the two valve cores, the B valve group is connected to a sleeve, a column head is rotatably connected inside the sleeve, a rack is fixedly connected to the column head, the length direction of the rack is consistent with the axial direction of the valve body, a gear is meshed with the rack, a rotating shaft is fixedly connected to the middle of the gear, the rotating shaft is rotatably connected to the valve body, and a pointer handle is connected through the valve body.

[0023] An explosion-proof box is installed outside the valve body. The explosion-proof box is located outside the pointer handle and has a transparent window to facilitate observation of the pointer handle's direction, thereby determining the status of the two valve cores.

[0024] The beneficial effects achieved by this utility model are:

[0025] This invention is applied to oil wellheads in oil fields, employing a composite integrated structure that allows for simultaneous, independent reverse control of fluids flowing in two different directions. By integrating mutually opposing control valve cores into a single unit, this design significantly simplifies the device structure and solves the problem of complex structures in traditional bidirectional fluid control. It is particularly suitable for scenarios requiring independent bidirectional fluid management, such as oil wellheads, and features a compact structure and reliable control, effectively improving the operating efficiency of the fluid system.

[0026] The valve assembly structure of this utility model can be used for fluid opening and closing control by sliding or by spiral sliding, which avoids the valve core from colliding with the valve port and improves sealing performance and service life.

[0027] In addition, to facilitate observation of the valve core's operating status, the pressure control valve can be equipped with structures such as racks, gears, and pointer handles to indicate the valve core's opening and closing status externally, and the operation of the two internal valve cores can be controlled using the external pointer handle. Attached Figure Description

[0028] 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:

[0029] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of valve group A and bushing in Embodiment 1 of this utility model (with valve group A blocking valve port).

[0031] Figure 3 This is a schematic diagram of the structure of valve group A and bushing in embodiment one of this utility model (valve group A in the open state);

[0032] Figure 4 This is a schematic diagram of the structure of valve group B and valve group A in embodiment one of this utility model (with valve group B blocking valve port B).

[0033] Figure 5 This is a schematic diagram of the structure of valve group B and valve group A in embodiment one of this utility model (valve group B in the open state).

[0034] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0035] Figure 7 This is a schematic diagram of the structure of Embodiment 2 of this utility model (with valve A in the open state);

[0036] Figure 8This is a schematic diagram of the structure of Embodiment 2 of this utility model (with valve B in the open state);

[0037] Figure 9 This is a schematic diagram of the structure of valve group A and bushing in embodiment three of this utility model (valve group A is in the state of blocking valve port A).

[0038] Figure 10 This is a schematic diagram of the structure of valve group A and bushing in embodiment three of this utility model (valve group A in the open state);

[0039] Figure 11 This is a schematic diagram of the structure of valve group B and valve group A in embodiment three of this utility model (with valve group B blocking valve port B).

[0040] Figure 12 This is a schematic diagram of the structure of valve group B and valve group A in embodiment three of this utility model (valve group B in the open state).

[0041] Figure 13 This is a schematic diagram of the structure of valve group B and valve group A in embodiment four of this utility model (with valve group B blocking valve port B).

[0042] Figure 14 This is a schematic diagram of the structure of valve group B and valve group A in embodiment four of this utility model (valve group B in the open state).

[0043] Figure 15 This is a scenario application diagram of this utility model when applied to an oil wellhead.

[0044] In the diagram: 1. Valve body; 2. A interface; 3. B valve core; 4. B sliding shaft; 5. Valve seat; 6. A valve core; 7. A sliding shaft; 8. Support rod; 9. Bushing; 10. B interface; 11. A pressure control cap; 12. Support rod; 13. Guide hole; 14. Bushing hole; 15. End; 16. A return spring; 17. A shock absorber; 18. B pressure control cap; 19. B shock absorber; 20. B return spring; 21. Sleeve; 22. Gear; 23. Rack; 24. Shaft; 25. Explosion-proof box; 26. Pointer handle; 27. Ball plunger; 28. First spiral groove; 29. ​​Threaded hole; 30. Ring sleeve; 31. Second spiral groove; 32. Pin; 33. Oil well casing; 34. Oil tubing; 35. Oil line; 36. Column head. Detailed Implementation

[0045] 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.

[0046] Example 1:

[0047] like Figures 1-5 As shown, a bidirectional composite axial flow pressure control valve includes a valve body 1, and an A port 2 and a B port 10 respectively connected to the valve body 1. The A port 2 and the B port 10 are respectively located at both ends of the valve body 1. A valve seat 5 is provided inside the valve body 1. An A valve port is provided at the valve seat 5. An A valve group is configured to block the A valve port. The A valve group only allows fluid to flow from the A port 2 to the B port 10. A B valve port is provided on the A valve group. A B valve group is configured to block the B valve port. The B valve group only allows fluid to flow from the B port 10 to the A port 2.

[0048] A support rod 8 is fixedly installed inside the valve body 1. The support rod 8 is a rod structure that will not block the valve body 1, thus not hindering the flow of fluid. A bushing 9 is fixedly connected to the support rod 8. The bushing 9 is arranged along the axial direction of the valve body 1. One end of the bushing 9 is threadedly connected to an A pressure control cap 11, which can block that end of the bushing 9. The other end of the bushing 9 is slidably sleeved with an A valve assembly. An A return spring 16 is provided between the A valve assembly and the A pressure control cap 11.

[0049] The pressure control cap 11 is threadedly connected to the bushing 9, which can adjust the feed length of the pressure control cap 11 relative to the bushing 9, thereby adjusting the preset pressure of the return spring 16 and thus adjusting the opening pressure of the valve group A.

[0050] Specifically, the A valve assembly includes an A valve core 6, which is an annular structure. The outer annular surface of the A valve core 6 can seal the A valve port, and the inner annular surface of the A valve core 6 is provided with a B valve port. The inner annular surface of the A valve core 6 is fixedly connected to a concentrically arranged A sliding shaft 7 via two support rods 12. The A sliding shaft 7 is slidably sleeved inside a bushing 9. The support rods 12 are rod structures and cannot seal the inner annular surface of the A valve core 6, thus not obstructing fluid flow.

[0051] To further optimize the structure, an A-shock-absorbing pad 17 is provided inside the A-pressure-controlling cap 11, and the end of the A-sliding shaft 7 near the A-pressure-controlling cap 11 is set as an end 15. The diameter of the end 15 is smaller than that of the A-sliding shaft 7, and an A-reset spring 16 is sleeved on the outside of the end 15. One end of the A-reset spring 16 is close to the A-shock-absorbing pad 17.

[0052] Valve group B is in sliding engagement with valve group A, and a return spring 20 is provided between valve group B and valve group A. Specifically:

[0053] The center of the A sliding shaft 7 is provided with a guide hole 13 and a bushing hole 14 that are interconnected. The guide hole 13 and the bushing hole 14 are configured as a stepped structure. The B valve group includes a B valve core 3, which is a circular plate whose outer surface can seal the B valve port. The B valve core 3 is concentrically fixedly connected to a B sliding shaft 4. The B sliding shaft 4 is slidably disposed in the guide hole 13 and the bushing hole 14. The end of the B sliding shaft 4 away from the B valve core 3 is threadedly connected to a B pressure control cap 18. The B sliding shaft 4 is externally sleeved with a B shock absorber 19 and a B return spring 20. The B shock absorber 19 and the B return spring 20 are disposed between the B pressure control cap 18 and the end face of the bushing hole 14.

[0054] The pressure control cap 18 is threadedly connected to the sliding shaft 4, which allows adjustment of the installation position of the pressure control cap 18 relative to the sliding shaft 4, thereby adjusting the preset pressure of the return spring 20 and thus adjusting the opening pressure of the valve assembly.

[0055] The mating surface between valve core 6 (A) and valve port A is an inclined surface, and the mating surface between valve core 3 (B) and valve port B is an inclined surface.

[0056] In the above structure, the bidirectional composite axial flow pressure control valve is mainly used at the wellhead of oilfield wells. An oil well casing 33 is installed outside the tubing 34, and the output end of the tubing 34 is connected to the oil pipeline 35. Figure 15 As shown, the two ends of the pressure control valve of this utility model are connected to the well casing 33 and the tubing 34 respectively. When the gas pressure in the well casing 33 is greater than the pressure in the tubing 34, valve core A 6 opens, and the gas in the well casing 33 enters the tubing 34 and releases the pressure. If the valve on the process line 35 is closed due to blockage or human error, and high pressure is generated due to back pressure, valve core B 3 opens and crude oil enters the casing to release the pressure and avoid safety accidents.

[0057] Example 2:

[0058] like Figures 6-8 As shown, this embodiment is basically the same as Embodiment 1, except that, in order to facilitate external observation of the operating status of the two valve cores and the opening / closing of the two valve cores, the B valve core 3 is connected to a sleeve 21. A column head 36 is rotatably connected inside the sleeve 21. When the B valve core 3 rotates, it drives the sleeve 21 to rotate relative to the column head 36. A rack 23 is fixedly connected to the column head 36. The length direction of the rack 23 is consistent with the axial direction of the valve body 1. The rack 23 is meshed with a gear 22. A rotating shaft 24 is fixedly connected to the middle of the gear 22. The rotating shaft 24 is rotatably connected to the valve body 1 and extends through the valve body 1 to connect to a pointer handle 26. The pointer handle 26 is a handle with a pointer.

[0059] An explosion-proof box 25 is provided on the outside of the valve body 1. The explosion-proof box 25 is located outside the pointer handle 26. The explosion-proof box 25 is provided with a transparent window to facilitate observation of the direction of the pointer handle 26, thereby determining the status of the two valve cores.

[0060] The inner wall of the valve body 1 is connected to a protective sleeve, which is set outside the rotating shaft 24 and has oil seals at both ends. The oil seals are set outside the rotating shaft 24 to ensure the sealing effect. An end cap is set at the end of the anti-slip sleeve away from the valve body 1.

[0061] like Figure 6 As shown, when both valve core A 6 and valve core B 3 are in the check valve closed state, gear 22 is in the middle section of rack 23 and pointer handle 26 also points to the middle;

[0062] When valve core A 6 opens, valve core B 3 slides along with it, causing rack 23 to move simultaneously with valve core A 6, that is, causing rack 23 to move linearly to the right. Figure 7 (From the perspective), the rack 23 moves to the right, causing the gear 22 to rotate. The shaft 24 connected to the gear 22 also rotates at the same time, causing the external pointer handle 26 to rotate. The pointer turns to the right, so the internal operation of the valve body 1 can be judged from the outside. When the A valve core 6 is reset, the B valve core 3 pushes the rack 23 to move to the left. The gear 22 follows and causes the pointer handle 26 connected to the shaft 24 to return to the middle position.

[0063] When valve core 3 of valve B is opened, it pushes rack 23 to move to the left. Rack 23 drives gear 22 and shaft 24 to rotate pointer handle 26 to the left. Figure 8 (Viewpoint) When valve core 3 is reset, it pulls rack 23 to make gear 22 drive shaft 24 to make pointer handle 26 return to the middle position.

[0064] When necessary, the opening and closing of the valve core inside the valve body 1 can also be controlled by operating the pointer handle 26.

[0065] Example 3:

[0066] like Figures 9-12 As shown, this embodiment is basically the same as embodiment one, except that a ball-head plunger 27 is fixedly connected to the inner surface of the bushing 9, and a first spiral groove 28 is provided on the outer surface of the sliding shaft A 7, and the ball-head plunger 27 slides in cooperation with the first spiral groove 28.

[0067] The above structure enables the A valve group to rotate while moving linearly relative to the valve body 1. Thus, when the A valve port is closed, the A valve group gradually approaches the A valve port in a spiral feed manner, avoiding direct impact of the A valve group on the A valve port, thereby preventing deformation of the A valve group and the A valve port.

[0068] Furthermore, the B valve group can generate rotational motion while moving linearly relative to the A valve group, specifically adopting the following structural form: the guide hole 13 is provided with a threaded hole 29, the B sliding shaft 4 is provided with a lead screw structure, and ball bearings are provided between the two. The B sliding shaft 4 and the guide hole 13 are configured as a ball screw nut pair.

[0069] Example 4:

[0070] like Figures 13-14 As shown, this embodiment is basically the same as embodiment three, except that valve group B can generate rotational motion relative to valve group A when moving linearly. The specific structure adopted is as follows: a second spiral groove 31 is opened on the inner surface of the bushing hole 14, and a ring 30 is axially slidably sleeved on the outside of the sliding shaft 4 of B. A pin 32 is fixedly connected to the outer edge of the ring 30, and the pin 32 slides in cooperation with the second spiral groove 31.

[0071] The ring 30 is disposed between the B return spring 20 and the B pressure cap 18. The ring 30 is connected to the B sliding shaft 4 by a flat key, and the ring 30 can move linearly relative to the axial direction of the B sliding shaft 4.

Claims

1. A bidirectional compound type axial flow pressure control valve, characterized by, The valve body (1) includes an A port (2) and a B port (10) that are respectively connected to the valve body (1). The A port (2) and the B port (10) are respectively located at both ends of the valve body (1). A valve seat (5) is provided inside the valve body (1). An A valve port is provided at the valve seat (5). An A valve group is configured to block the A valve port. The A valve group only allows fluid to flow from the A port (2) to the B port (10). A B valve port is provided on the A valve group. A B valve group is configured to block the B valve port. The B valve group only allows fluid to flow from the B port (10) to the A port (2). A support rod (8) is fixedly installed inside the valve body (1). A bushing (9) is fixedly connected to the support rod (8). The bushing (9) is arranged along the axial direction of the valve body (1). One end of the bushing (9) is threadedly connected to an A pressure control cap (11). The A pressure control cap (11) can seal the end of the bushing (9). The other end of the bushing (9) is slidably sleeved with the A valve group. An A return spring (16) is provided between the A valve group and the A pressure control cap (11). The B valve group is in sliding engagement with the A valve group, and a B return spring (20) is provided between the B valve group and the A valve group.

2. The bidirectional compound type pressure regulating valve according to claim 1, wherein The valve group A includes valve core A (6), which is a ring structure. The outer ring surface of valve core A (6) can block valve port A. Valve port B is provided on the inner ring surface of valve core A (6). A sliding shaft A (7) is fixedly connected to the inner ring surface of valve core A (6) through a support rod (12). The sliding shaft A (7) is slidably sleeved inside the bushing (9).

3. The bidirectional compound type pressure regulating valve according to claim 2, wherein The pressure control cap (11) is provided with a shock-absorbing pad (17). The end of the sliding shaft (7) near the pressure control cap (11) is set as an end (15). The diameter of the end (15) is smaller than that of the sliding shaft (7). The end (15) is fitted with a reset spring (16). One end of the reset spring (16) is close to the shock-absorbing pad (17).

4. The bidirectional composite type variable area valve according to claim 2 or 3, characterized by The inner surface of the bushing (9) is fixedly connected to a ball-head plunger (27), and the outer surface of the sliding shaft (7) is provided with a first spiral groove (28), and the ball-head plunger (27) slides in conjunction with the first spiral groove (28).

5. The bidirectional compound type pressure regulating valve according to claim 2, wherein The center of the A sliding shaft (7) is provided with a guide hole (13) and a bushing hole (14) that are interconnected. The guide hole (13) and the bushing hole (14) are set as a stepped structure. The B valve group includes a B valve core (3). The B valve core (3) is a circular plate. Its outer surface can block the B valve port. The B valve core (3) is concentrically fixedly connected to the B sliding shaft (4). The B sliding shaft (4) is slidably disposed in the guide hole (13) and the bushing hole (14). The end of the B sliding shaft (4) away from the B valve core (3) is threadedly connected to the B pressure control cap (18). The B sliding shaft (4) is sleeved with a B shock absorber (19) and a B return spring (20). The B shock absorber (19) and the B return spring (20) are disposed between the B pressure control cap (18) and the end face of the bushing hole (14).

6. The bidirectional compound type pressure regulating valve according to claim 5, wherein The inner surface of the bushing hole (14) is provided with a second spiral groove (31), and the outer axial sliding sleeve (30) of the B sliding shaft (4) is provided with a ring sleeve (30), and a pin (32) is fixedly connected to the outer edge of the ring sleeve (30). The pin (32) slides in cooperation with the second spiral groove (31).

7. The bidirectional compound type pressure regulating valve according to claim 6, wherein The ring sleeve (30) is positioned between the B return spring (20) and the B pressure cap (18), and the ring sleeve (30) is connected to the B sliding shaft (4) via a flat key.

8. The bidirectional compound type pressure regulating valve according to claim 5, wherein The guide hole (13) is configured with a threaded hole (29), and the B sliding shaft (4) is configured as a ball screw structure. The B sliding shaft (4) and the guide hole (13) are configured as a ball screw nut pair.

9. The bidirectional compound type pressure regulating valve according to claim 5, wherein The mating surface between valve core A (6) and valve port A is an inclined surface, and the mating surface between valve core B (3) and valve port B is an inclined surface.

10. The bidirectional compound type pressure regulating valve according to claim 1, wherein The B valve group is connected to a sleeve (21), and a column head (36) is rotatably connected inside the sleeve (21). A rack (23) is fixedly connected to the column head (36). The length direction of the rack (23) is consistent with the axial direction of the valve body (1). A gear (22) is meshed with the rack (23). A rotating shaft (24) is fixedly connected to the middle of the gear (22). The rotating shaft (24) is rotatably connected to the valve body (1) and passes through the valve body (1) to connect to a pointer handle (26). The valve body (1) is provided with an explosion-proof box (25) on the outside. The explosion-proof box (25) is located outside the pointer handle (26) and has a transparent window.

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