Self-operated nitrogen seal pressure reducing device regulating valve

Abstract

The application discloses a self-operated nitrogen seal pressure reducing device adjusting valve, which comprises a valve body, a valve cover, a dismounting assembly, a backflow assembly and a cutting assembly, the dismounting assembly comprises a mounting and dismounting part, a working part and a limiting part, the valve cover is fixedly installed on the valve body, one side of the valve body is provided with an air outlet pipe, one side of the valve body is provided with an air inlet pipe, both sides of the valve body are respectively provided with flanges, the air outlet pipe is connected with an air pressure cylinder, the air pressure cylinder is provided with a first spring, and the air pressure cylinder is rotatably connected with a mounting block. By twisting the sleeve texture area, the first thread area slides upward, the inner wall of the sleeve is in threaded cooperation with the second thread area to be positioned, the first thread area is in threaded cooperation with the mounting block to be positioned, the position of the connecting rod is fixed, the piston block cannot slide upward, the maintenance and replacement of the first spring can be completed without dismounting the valve body and the valve cover and stopping the machine, and continuous work of the device is ensured.

Description

Technical Field

[0001] This invention relates to the field of control valve technology, and in particular to a control valve for a self-regulating nitrogen sealing pressure reducing device. Background Technology

[0002] Self-operated nitrogen sealing regulating valves are core control components in petroleum, chemical, and storage tank protection systems. They are mainly used to maintain a slight positive pressure of nitrogen inside the storage tank, isolate the entry of outside air, and prevent the oxidation, volatilization, and formation of explosive gas mixtures in the tank. They rely on the pressure of the medium itself to achieve automatic opening and closing and pressure regulation, without the need for an external power source. They are widely used for the safety protection and pressure stabilization control of atmospheric pressure storage tanks.

[0003] The regulating valve for a self-operated nitrogen sealing pressure reducing device disclosed in patent publication number "CN115435124B" adjusts the pressure of the spring between the upper and lower chucks by having the first threaded rod press against the upper chuck through the mating sleeve. The spring works in conjunction with the valve stem. Although it can control the pressure of the sealing plug at the lower end of the valve stem, in actual use, when a high pressure occurs and the system is in the intake state, nitrogen will still continuously enter the tank, causing the system to remain under high pressure, thus failing to fully meet the safety requirements of the nitrogen sealing device.

[0004] Accordingly, this application proposes a regulating valve for a self-regulating nitrogen sealing pressure reducing device. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a regulating valve for a self-regulating nitrogen sealing pressure reducing device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A regulating valve for a self-operated nitrogen sealing pressure reducing device includes a valve body, a valve cover, a disassembly assembly, a reflux assembly, and a shut-off assembly. The disassembly assembly includes a loading / unloading part, a working part, and a limiting part.

[0008] The valve cover is fixedly installed on the valve body. An air outlet pipe is provided on one side of the valve body, and an air inlet pipe is provided on the other side of the valve body. Flanges are provided on both sides of the valve body. A pneumatic cylinder is connected to the air outlet pipe. A first spring is provided inside the pneumatic cylinder. An installation block is rotatably connected inside the pneumatic cylinder. A first sliding groove is provided on both sides of the valve body. A piston rod is provided inside the valve body. A valve plug is fixedly connected to one end of the piston rod. The valve plug is slidably connected inside the valve body. A second sliding groove is provided on the piston rod.

[0009] The cut-off component is used to cut off the nitrogen input when the gas pressure is too high;

[0010] The reflux assembly is used to reflux excess nitrogen when the gas pressure is too high;

[0011] The disassembly and assembly assembly is used to replace the first spring without affecting the use of the device.

[0012] Preferably, the cut-off assembly includes a sealing frame, a sealing block, a piston block, and a connecting rod. The connecting rod is slidably connected in a first groove and in a second groove. The sealing frame is fixedly installed below the air intake pipe, and the piston block is slidably connected in a pneumatic cylinder.

[0013] Preferably, the connecting rod is slidably connected to the intake pipe, the connecting rod is slidably connected to the sealing frame, one end of the connecting rod is fixedly connected to the piston block, the other end is fixedly connected to the sealing block, the sealing block is slidably connected inside the sealing frame, and the sealing block is slidably connected to the intake pipe.

[0014] Preferably, the reflux assembly includes a tube rod, a limiting ring, a limiting frame, and an air hole; the air hole is located on the sealing block, the limiting frame is fixedly installed on the sealing block, and the limiting ring is located at the air hole.

[0015] Preferably, the tube rod is disposed in the first sliding groove and the second sliding groove. One end of the tube rod is connected to the air cylinder, and the other end is disposed in the air intake pipe. The limiting ring is fixedly connected to one end of the tube rod.

[0016] Preferably, the disassembly and assembly part includes a ring plate, a ring groove, and a plurality of protruding blocks; the plurality of protruding blocks are respectively fixedly connected to the mounting block, the ring plate is disposed on the mounting block, the ring groove is disposed on the mounting block, and the ring plate is slidably connected in the ring groove.

[0017] Preferably, the limiting part includes two positioning holes, a telescopic cylinder, a fixing plate, a ball, a round rod, a round cylinder, and a second spring; the two positioning holes are respectively provided on the mounting block, the telescopic cylinder is fixedly mounted on the ring plate, and the fixing plate is fixedly connected to one end of the sleeve.

[0018] Preferably, the round rod is fixedly connected to the fixing plate, the cylinder is slidably connected in the positioning hole, the cylinder and the round rod are slidably connected, the ball is movably connected to one end of the cylinder, the ball is disposed in the positioning hole, one end of the second spring is fixedly connected to the cylinder, and the other end is fixedly connected to the fixing plate.

[0019] Preferably, the working part includes a sleeve, a textured area, a first threaded area, and a second threaded area; the sleeve is disposed on the mounting block, the textured area is disposed on the sleeve, the first threaded area is disposed on the sleeve, the first threaded area is slidably connected to the mounting block, and the second threaded area is disposed on the connecting rod.

[0020] Preferably, the connecting rod is slidably connected inside the sleeve, the first threaded area is slidably connected to the mounting block, the upper inner wall of the sleeve can be slidably connected to the second threaded area, and one end of the first spring is attached to the piston block and the other end is attached to the mounting block.

[0021] The present invention has the following beneficial effects:

[0022] 1. By using the cut-off component, when the pressure inside the outlet pipe is too high, the air pressure causes the piston block to compress the first spring and drive the connecting rod to slide upward along the first and second sliding grooves. The connecting rod drives the sealing block to slide within the sealing frame, causing the sealing block to block the flow channel of the inlet pipe and prevent nitrogen from continuing to enter the valve body, thus achieving nitrogen input cut-off. The pressure range is determined by the stiffness and pre-compression of the first spring. The corresponding specific pressure threshold can be adjusted according to different application scenarios. This can prevent nitrogen in the inlet pipe from continuing to enter the valve body, causing the pressure on the outlet pipe side and the downstream system to continue to rise.

[0023] Second, through the reflux assembly, when the sealing block blocks the air inlet pipe, the sealing block of the limit frame slides. At this time, the limit ring is embedded in the limit frame, and the tube rod is connected to the air hole. When the air pressure in the outlet pipe continues to rise, the piston block continues to slide upward. At this time, the connection between the tube rod and the pressure cylinder is exposed, and the gas enters the tube rod through the pressure cylinder and flows back to the air inlet pipe through the tube rod, avoiding the direct discharge of high-pressure nitrogen into the external environment, which would cause gas waste and safety hazards.

[0024] Third, by disassembling and assembling the components, when the first spring needs maintenance and replacement, the first threaded area is slid upward by turning the textured area of ​​the sleeve. At the same time, the sleeve slides upward, and its inner wall forms a threaded engagement with the second threaded area for positioning. The first threaded area also forms a threaded engagement with the mounting block for positioning. In this way, the position of the connecting rod is fixed, so that the piston block cannot slide upward. Thus, the maintenance and replacement of the first spring can be completed without disassembling the valve body and valve cover and without stopping the machine, ensuring continuous operation of the device.

[0025] 4. By disassembling and assembling the components, pull the fixing plate upward to release the positioning of the ring plate by the limiting part, pull the fixing plate to rotate the ring plate so that it enters the ring groove, and then slightly rotate the mounting block by the convex block so that one end of the first spring is exposed from the original position of the ring plate. Finally, pull the first spring to rotate around the connecting rod so that the first spring gradually separates from the assembly area between the piston block and the mounting block, thus completing the disassembly of the first spring. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a regulating valve for a self-regulating nitrogen sealing pressure reducing device proposed in this invention;

[0027] Figure 2 This is an internal sectional view of the valve body of a regulating valve for a self-operated nitrogen sealing pressure reducing device proposed in this invention;

[0028] Figure 3 for Figure 2 Enlarged diagram of point A in the diagram;

[0029] Figure 4 This is an internal cross-sectional view of the regulating valve pressure cylinder of a self-regulating nitrogen sealing pressure reducing device proposed in this invention;

[0030] Figure 5 This is an internal sectional view of the regulating valve mounting block for a self-operated nitrogen sealing pressure reducing device proposed in this invention;

[0031] Figure 6 for Figure 5 Enlarged diagram of point A in the diagram;

[0032] Figure 7 This is a schematic diagram of the connection structure of the regulating valve sleeve, mounting block, and annular groove, etc., for a self-operated nitrogen sealing pressure reducing device proposed in this invention.

[0033] Figure 8 This is a schematic diagram of the connection structure of the regulating valve sealing frame, limiting frame, and air vents in a self-regulating nitrogen sealing pressure reducing device proposed in this invention.

[0034] In the diagram: 1. Valve body; 2. Valve cover; 3. Outlet pipe; 4. Flange; 5. Inlet pipe; 6. Air cylinder; 7. Connecting rod; 8. Pipe rod; 9. First slide groove; 10. Valve plug; 11. Piston rod; 12. Second slide groove; 13. Piston block; 14. First spring; 15. Sealing block; 16. Sealing frame; 17. Limiting ring; 18. Air hole; 19. Limiting frame; 20. Mounting block; 21. Ring groove; 22. Raised strip block; 23. Second threaded area; 24. Sleeve; 25. Textured area; 26. Ring plate; 27. Fixing plate; 28. First threaded area; 29. ​​Positioning hole; 30. Telescopic cylinder; 31. Cylinder; 32. Round rod; 33. Second spring; 34. Ball bearing. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] Example 1:

[0037] Reference Figures 1 to 4 as well as Figure 8 A regulating valve for a self-operated nitrogen sealing pressure reducing device includes a valve body 1, a valve cover 2, a disassembly assembly, a reflux assembly, and a shut-off assembly. The disassembly assembly includes a loading / unloading part, a working part, and a limiting part.

[0038] The valve cover 2 is fixedly installed on the valve body 1 to seal the top of the valve body 1 and protect the internal components. A gas outlet pipe 3 is provided on one side of the valve body 1 to discharge regulated nitrogen to the downstream system. A gas inlet pipe 5 is provided on one side of the valve body 1 to input nitrogen to be regulated. Flanges 4 are provided on both sides of the valve body 1 to achieve a fixed connection between the valve body 1 and external pipelines. A pressure cylinder 6 is connected to the gas outlet pipe 3 to install the first spring 14 and the piston block 13 and to provide pressure sensing space. The first spring 14 is installed inside the pressure cylinder 6 to provide a reset force and assist in pressure adjustment. A mounting block 20 is rotatably connected inside the pressure cylinder 6. The valve body 1 is used to support the first spring 14 and to replace the spring with the disassembly and assembly components. The valve body 1 has a first slide groove 9 on each side to provide guidance and limit for the sliding of the connecting rod 7. The valve body 1 has a piston rod 11 inside to drive the valve plug 10 to move and adjust the size of the internal passage of the valve body 1. One end of the piston rod 11 is fixedly connected to the valve plug 10, which is slidably connected inside the valve body 1 to control the flow and flow rate of nitrogen inside the valve body 1, and at the same time to prevent nitrogen from leaking above the valve plug 10 when nitrogen is flowing. The piston rod 11 has a second slide groove 12 to cooperate with the first slide groove 9 to provide double guidance for the connecting rod 7.

[0039] The cut-off assembly is used to cut off the nitrogen input when the pressure is too high;

[0040] The reflux assembly is used to reflux excess nitrogen when the pressure is too high;

[0041] The disassembly and assembly assembly is used to replace the first spring 14 without affecting the use of the device.

[0042] The cut-off assembly includes a sealing frame 16, a sealing block 15, a piston block 13, and a connecting rod 7. The connecting rod 7 is slidably connected in the first sliding groove 9 and in the second sliding groove 12. Stable sliding is achieved through the cooperation of the two sliding grooves. The sealing frame 16 is fixedly installed below the air intake pipe 5. The connection between the sealing frame 16 and the air intake pipe 5 is sealed. The piston block 13 is slidably connected in the air pressure cylinder 6 and is used to sense the air pressure change on the side of the air outlet pipe 3 and drive the connecting rod 7 to move.

[0043] The connecting rod 7 is slidably connected to the intake pipe 5 and the sealing frame 16, realizing multi-position guidance and ensuring smooth sliding. One end of the connecting rod 7 is fixedly connected to the piston block 13 to transmit the power of the piston block 13, and the other end is fixedly connected to the sealing block 15 to drive the sealing block 15 to move. The sealing block 15 is slidably connected inside the sealing frame 16 and the intake pipe 5. Through the cooperation of the sealing block 15, the sealing frame 16, and the intake pipe 5, the intake pipe 5 is blocked and opened, thereby cutting off the nitrogen input.

[0044] In this embodiment, when the pressure inside the exhaust pipe is too high, the air pressure causes the piston block to compress the first spring and drive the connecting rod to slide upward along the first and second sliding grooves. The connecting rod drives the sealing block to slide within the sealing frame, causing the sealing block to block the flow channel of the intake pipe and prevent nitrogen from continuing to enter the valve body, thus achieving nitrogen input cutoff. The pressure range is determined by the stiffness and pre-compression of the first spring 14. The corresponding specific pressure threshold can be adjusted by replacing the first spring 14 with different specifications. This can prevent nitrogen in the intake pipe from continuing to enter the valve body, causing the pressure on the exhaust pipe side and the rear system to continue to rise.

[0045] Example 2:

[0046] Unlike Example 1, referring to Figures 1 to 4 as well as Figure 8 This embodiment also has the following further features:

[0047] The reflux assembly includes a tube rod 8, a limiting ring 17, a limiting frame 19, and an air hole 18. The air hole 18 is located on the sealing block 15 to form a high-pressure nitrogen reflux channel. The limiting frame 19 is fixedly installed on the sealing block 15 to cooperate with the limiting ring 17 to achieve docking and positioning. The limiting ring 17 is located at the air hole 18 to ensure the sealing docking of the reflux channel.

[0048] The tube rod 8 is located in the first slide groove 9 and the second slide groove 12. The first slide groove 9 and the second slide groove 12 guide and position the tube rod 8. One end of the tube rod 8 is connected to the air cylinder 6 to introduce high-pressure gas. The other end passes through the air inlet pipe 5 and is located in the air inlet pipe 5 to guide high-pressure nitrogen back to the air inlet end. A one-way valve is provided in the tube rod 8 to prevent gas in the air inlet pipe 5 from entering the pressure cylinder 6 through the tube rod 8 under normal conditions. The limiting ring 17 is fixedly connected to one end of the tube rod 8 to cooperate with the limiting frame 19 to seal and prevent backflow gas leakage.

[0049] In this embodiment, when the sealing block 15 blocks the air inlet pipe 5, the sealing block 15 of the limiting frame 19 slides. At this time, the limiting ring 17 is embedded in the limiting frame 19, and the pipe rod 8 is connected to the air hole 18. When the air pressure in the air outlet pipe 3 continues to rise, the piston block 13 continues to slide upward. At this time, the connection between the pipe rod 8 and the pressure cylinder 6 is exposed, and the gas enters the pipe rod 8 through the pressure cylinder 6 and flows back to the air inlet pipe 5 through the pipe rod 8, avoiding the direct discharge of high-pressure nitrogen into the external environment, which would cause gas waste and safety hazards.

[0050] Example 3:

[0051] Reference Figure 1 , Figure 2 and Figures 4 to 7 Compared to Embodiment 1 and Embodiment 2, in this embodiment:

[0052] The disassembly and assembly part includes a ring plate 26, a ring groove 21, and several protruding blocks 22; the several protruding blocks 22 are respectively fixedly connected to the mounting block 20 to drive the mounting block 20 to rotate; the ring plate 26 is set on the mounting block 20 and cooperates with the mounting block 20 to limit the first spring 14; the ring groove 21 is set on the mounting block 20 to accommodate the ring plate 26 to release the limit; the ring plate 26 is slidably connected in the ring groove 21 to realize sliding storage and extension limit.

[0053] The limiting part includes two positioning holes 29, a telescopic cylinder 30, a fixing plate 27, a ball bearing 34, a round rod 32, a round cylinder 31, and a second spring 33; the two positioning holes 29 are respectively provided on the mounting block 20 and are used to cooperate with the ball bearing 34 to achieve positioning; the telescopic cylinder 30 is fixedly installed on the ring plate 26 to provide telescopic guidance; the fixing plate 27 is fixedly connected to one end of the telescopic cylinder 30 to drive the telescopic cylinder 30 and its internal components to move.

[0054] The round rod 32 is fixedly connected to the fixed plate 27 to provide guidance for the cylinder 31. The cylinder 31 is slidably connected in the positioning hole 29 to accommodate the ball 34. The cylinder 31 and the round rod 32 are slidably connected to achieve telescopic sliding. The ball 34 is movably connected to one end of the cylinder 31 and is located in the positioning hole 29. One end of the second spring 33 is fixedly connected to the cylinder 31 and the other end is fixedly connected to the fixed plate 27 to provide a clamping force for the ball 34.

[0055] The working part includes a sleeve 24, a textured area 25, a first threaded area 28, and a second threaded area 23. The sleeve 24 is mounted on the mounting block 20 and is used to cooperate with the connecting rod 7 for positioning. The textured area 25 is mounted on the sleeve 24 to increase the friction during tightening. The first threaded area 28 is mounted on the sleeve 24 and is used to cooperate with the mounting block 20 for sliding. The first threaded area 28 is slidably connected to the mounting block 20 to achieve axial movement. The second threaded area 23 is mounted on the connecting rod 7 and is used to cooperate with the upper inner wall of the sleeve 24 for locking.

[0056] The connecting rod 7 is slidably connected inside the sleeve 24, allowing the sleeve 24 to slide on the connecting rod 7. The first threaded area 28 is slidably connected to the mounting block 20, enabling the axial movement of the sleeve 24. The upper inner wall of the sleeve 24 can be engaged with the second threaded area 23 to fix the position of the connecting rod 7. One end of the first spring 14 is attached to the piston block 13, and the other end is attached to the mounting block 20, forming a support between the mounting block 20 and the piston block 13.

[0057] In this embodiment, when the first spring 14 needs maintenance or replacement, the first threaded area 28 slides upward by turning the textured area 25 of the sleeve 24. Simultaneously, the sleeve 24 slides upward, and its inner wall forms a threaded engagement with the second threaded area 23 for positioning. The first threaded area 28, in turn, forms a threaded engagement with the mounting block 20 for positioning. This fixes the position of the connecting rod 7, preventing the piston block 13 from sliding upward. Therefore, without disassembling the valve body 1 and valve cover 2, the first spring 14 can be maintained or replaced without stopping the machine, ensuring continuous operation of the device. Then, the fixing plate 27 is pulled upward to move the ball bearing 3... 4. Expose the ring plate 26 by pulling the fixing plate 27 and rotating it. At the same time, the ball bearing 34 rolls on the mounting block 20 until it enters another positioning hole 29. Simultaneously, the ring plate 26 enters the ring groove 21. Finally, the mounting block 20 can be slightly rotated by the protruding strip block 22 to expose one end of the first spring 14 from its original position on the ring plate 26. Pull the first spring 14 to rotate around the connecting rod 7 so that the first spring 14 gradually separates from the assembly area between the piston block 13 and the mounting block 20. Finally, by passing one end of the first spring 14 around the connecting rod 7 and continuously rotating it to separate it from the connecting rod 7, the disassembly of the first spring 14 is completed.

[0058] It should be noted that when replacing the new first spring 14, first rotate one end of it around the connecting rod 7 and put it on the connecting rod 7. Then, insert one end of it through the ring plate 26 between the mounting block 20 and the piston block 13, and rotate it continuously until it is completely inserted into the air cylinder 6. Finally, repeat the reset operation of the limiting part and the working part to complete the entire disassembly and installation process.

[0059] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A regulating valve for a self-regulating nitrogen sealing pressure reducing device, characterized in that, It includes a valve body (1), a valve cover (2), a disassembly assembly, a reflux assembly, and a shut-off assembly. The disassembly assembly includes a loading / unloading part, a working part, and a limiting part. The valve cover (2) is fixedly installed on the valve body (1). The valve body (1) has an air outlet pipe (3) on one side and an air inlet pipe (5) on one side. The valve body (1) has flanges (4) on both sides. The air outlet pipe (3) is connected to a pneumatic cylinder (6). The pneumatic cylinder (6) has a first spring (14) inside. The pneumatic cylinder (6) has a mounting block (20) rotatably connected inside. The valve body (1) has a first sliding groove (9) on both sides. The valve body (1) has a piston rod (11) inside. One end of the piston rod (11) is fixedly connected to a valve plug (10). The valve plug (10) is slidably connected inside the valve body (1). The piston rod (11) has a second sliding groove (12). The cut-off component is used to cut off the nitrogen input when the gas pressure is too high; The reflux assembly is used to reflux excess nitrogen when the gas pressure is too high; The disassembly and assembly assembly is used to replace the first spring (14) without affecting the use of the device.

2. The regulating valve for a self-regulating nitrogen sealing pressure reducing device according to claim 1, characterized in that, The cut-off assembly includes a sealing frame (16), a sealing block (15), a piston block (13), and a connecting rod (7). The connecting rod (7) is slidably connected in the first slide groove (9) and slidably connected on the second slide groove (12). The sealing frame (16) is fixedly installed below the air inlet pipe (5), and the piston block (13) is slidably connected in the air pressure cylinder (6).

3. The regulating valve for a self-regulating nitrogen sealing pressure reducing device according to claim 2, characterized in that, The connecting rod (7) is slidably connected to the intake pipe (5) and the connecting rod (7) is slidably connected to the sealing frame (16). One end of the connecting rod (7) is fixedly connected to the piston block (13) and the other end is fixedly connected to the sealing block (15). The sealing block (15) is slidably connected inside the sealing frame (16) and the sealing block (15) is slidably connected to the intake pipe (5).

4. The regulating valve for a self-regulating nitrogen sealing pressure reducing device according to claim 2, characterized in that, The reflux assembly includes a tube rod (8), a limiting ring (17), a limiting frame (19), and an air hole (18); the air hole (18) is located on the sealing block (15), the limiting frame (19) is fixedly installed on the sealing block (15), and the limiting ring (17) is located at the air hole (18).

5. A regulating valve for a self-regulating nitrogen sealing pressure reducing device according to claim 4, characterized in that, The tube rod (8) is located in the first sliding groove (9) and the tube rod (8) is located in the second sliding groove (12). One end of the tube rod (8) is connected to the air cylinder (6) and the other end is connected to the through air inlet pipe (5) and located in the air inlet pipe (5). The limiting ring (17) is fixedly connected to one end of the tube rod (8).

6. A regulating valve for a self-regulating nitrogen sealing pressure reducing device according to claim 1, characterized in that, The disassembly and assembly part includes a ring plate (26), a ring groove (21) and a plurality of protruding blocks (22); the plurality of protruding blocks (22) are respectively fixedly connected to the mounting block (20), the ring plate (26) is provided on the mounting block (20), the ring groove (21) is provided on the mounting block (20), and the ring plate (26) is slidably connected in the ring groove (21).

7. A regulating valve for a self-regulating nitrogen sealing pressure reducing device according to claim 6, characterized in that, The limiting part includes two positioning holes (29), a telescopic cylinder (30), a fixing plate (27), a ball (34), a round rod (32), a round cylinder (31), and a second spring (33); the two positioning holes (29) are respectively provided on the mounting block (20), the telescopic cylinder (30) is fixedly installed on the ring plate (26), and the fixing plate (27) is fixedly connected to one end of the sleeve (24).

8. A regulating valve for a self-regulating nitrogen sealing pressure reducing device according to claim 7, characterized in that, The round rod (32) is fixedly connected to the fixed plate (27), the cylinder (31) is slidably connected in the positioning hole (29), the cylinder (31) is slidably connected to the round rod (32), the ball (34) is movably connected to one end of the cylinder (31), the ball (34) is located in the positioning hole (29), one end of the second spring (33) is fixedly connected to the cylinder (31), and the other end is fixedly connected to the fixed plate (27).

9. A regulating valve for a self-regulating nitrogen sealing pressure reducing device according to claim 2, characterized in that, The working part includes a sleeve (24), a textured area (25), a first threaded area (28), and a second threaded area (23); the sleeve (24) is disposed on the mounting block (20), the textured area (25) is disposed on the sleeve (24), the first threaded area (28) is disposed on the sleeve (24), the first threaded area (28) is slidably connected to the mounting block (20), and the second threaded area (23) is disposed on the connecting rod (7).

10. A regulating valve for a self-regulating nitrogen sealing pressure reducing device according to claim 9, characterized in that, The connecting rod (7) is slidably connected inside the sleeve (24), the first threaded area (28) is slidably connected to the mounting block (20), the upper inner wall of the sleeve (24) can be slidably connected to the second threaded area (23), one end of the first spring (14) is attached to the piston block (13), and the other end is attached to the mounting block (20).

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