A pressure-adjustable self-operated pressure regulating valve and its use method

Abstract

The present invention discloses a pressure-adjustable self-operated pressure regulating valve and a method for using the same, which relates to the technical field of regulating valves. The valve body comprises a connecting pipe, a cylinder barrel, a pneumatic cylinder, and a propulsion cylinder. Symmetrical connecting pipes are fixedly connected on both sides of the valve body. When the pipe is connected to the sealing groove, a rotating clamping bolt is rotated to reduce the gap between the moving block and the clamping plate. The clamping ring is fastened to the pipe. The propulsion bolt rotates on the tightening column to drive the moving block to move toward the connecting pipe. The pipe is inserted into the sealing groove and fixed. The fixed block is pushed with a propulsion handle to move the rotating clip on the fixed block. The rotating clip moves to different pressure levels in different limit groove pressure bins. When the upper surface of the rotating clip corresponds to the upper surface of the limit groove, four rotating clips are rotated to fit the upper surface of the limit groove and fixed. The valve body of the present invention is easy to install, the pressure of the pressure regulating valve can be adjusted, the valve body has strong adaptability, can act on different working environments, has strong practicality, and is suitable for promotion.

Description

Technical Field

[0001] The present invention belongs to the technical field of regulating valves, and in particular relates to a pressure-adjustable self-operated pressure regulating valve and a method of using the same. Background Art

[0002] Self-operated pressure regulating valves are divided into three series: self-operated pressure regulating valves, pressure differential regulating valves, and flow regulating valves. Self-operated pressure regulating valves are divided into two categories based on the location of the pressure point: before the valve and after the valve. When the pressure point is before the valve, it is used to maintain a constant pressure before the valve; when the pressure point is after the valve, it is used to maintain a constant pressure after the valve. Existing self-operated pressure regulating valves generally use a spring to provide pressure on the valve seat. When the pressure acting on the valve exceeds a certain value, the valve opens to adjust the pressure inside the pipeline. However, this regulation method is relatively simple. Adjusting the pressure of the pressure regulating valve while reducing costs so that it can act in different working environments is one of the current problems that need to be solved. Summary of the Invention

[0003] The purpose of the present invention is to provide a pressure-adjustable self-operated pressure regulating valve and a method of using the same. The valve body is easy to install, the pressure of the pressure regulating valve can be adjusted, it has strong adaptability, can act on different working environments, is highly practical, and is suitable for promotion.

[0004] The present invention provides the following technical solution: a pressure-adjustable self-operated pressure regulating valve, comprising a valve body, a connecting pipe, a cylinder barrel, a pneumatic cylinder, and a propulsion cylinder, wherein symmetrical connecting pipes are fixedly connected on both sides of the valve body, a sealing groove is provided on the outer side of the connecting pipe, a fixing ring is fixedly provided on the surface of the connecting pipe, a tightening column is evenly fixed on the fixing ring, a propulsion thread is provided on the surface of the tightening column, a moving block is slidably provided on the tightening column, a propulsion bolt connected to the tightening column by a thread is slidably connected to the other side of the moving block, clamping plates are connected on both sides of the moving block by clamping bolts, and the clamping plates are fixedly connected to the clamping ring;

[0005] The propulsion cylinder is provided with a propulsion column, one end of which is located outside the propulsion cylinder and is fixedly provided with a propulsion handle, the other end of the propulsion column is fixedly connected to a fixed block, the lower surface of the fixed block is fixedly connected to a gas pressure column, the other end of the gas pressure column is fixedly connected to a gas pressure plug, the gas pressure plug is located in the pressure chamber of the pneumatic cylinder, the pneumatic cylinder is fixedly connected to the cylinder barrel, the pressure chamber is tightly connected to the movement chamber, a piston rod is slidingly provided in the movement chamber, a piston is fixedly provided on the upper surface of the piston rod, the other end of the piston rod is fixedly connected to a valve stem, the piston rod is fixedly provided with a dust ring at the connection between the valve stem, the lower surface of the cylinder barrel is fixedly connected to a connecting flange, the connecting flange is connected to a connecting pipe by fixing bolts, a guide sleeve is fixedly provided in the connecting pipe, the valve stem passes through the guide sleeve, the valve body is fixedly provided with a valve seat that separates its interior, and the valve seat is provided with a valve hole corresponding to the valve stem. The valve stem is fixedly provided with a valve seat core that matches it at the valve hole;

[0006] The propulsion cylinder is provided with a slide groove at the position of the fixed block corresponding to the slide groove, a limit block with a length matching the slide groove is fixedly provided on one side of the slide groove, and limit grooves are evenly provided on the limit block. The fixed block is located on one side of the slide groove and is fixed with a limit shaft. The limit shaft is connected to a rotating clip through a rotating shaft, and the thickness of the rotating clip matches the limit groove.

[0007] Preferably, a gap is provided between the clamping plate and the moving block via a clamping bolt, the clamping ring is tough, and a friction pattern is provided on the inner surface, the sealing groove matches the pipe connected to the connecting pipe, and a sealing gasket is provided inside.

[0008] Preferably, the air pressure plug is tightly connected to the inner side of the pressure chamber, and the piston is tightly connected to the inner side of the movement chamber.

[0009] Preferably, the dust ring is slidably connected to the inner side wall of the movement chamber, and a water retaining ring is provided in the guide sleeve.

[0010] Preferably, a stabilizing seat is fixedly provided on the lower surface of the valve body, the stabilizing seat is provided with a stabilizing groove at a position corresponding to the piston rod in the valve body, and a stabilizing column is fixedly provided at a position corresponding to the stabilizing groove on the piston rod.

[0011] In order to achieve the above-mentioned purpose of the invention, the present invention also discloses the following technical solution: a method for using a pressure-adjustable self-operated pressure regulating valve, comprising the following steps:

[0012] 1) Installation: When the pipe is connected to the sealing groove, rotate the clamping bolt to reduce the gap between the moving block and the clamping plate. Fasten the clamping ring to the pipe. Push the bolt to rotate on the tightening column to drive the moving block toward the connecting pipe. Insert the pipe into the sealing groove and secure it.

[0013] 2) Adjust the pressure: Push the fixed block with the push handle to move the rotating clip on the fixed block. The upper surface of the rotating clip corresponds to the upper surface of the limit slot. The rotating clip moves to different limit slots in the pressure chamber to achieve different pressure levels.

[0014] 3) Fixation: When the upper surface of the rotating clip corresponds to the upper surface of the limit groove, keep the position of the push handle unchanged, rotate the four rotating clips, fit their upper surfaces to the upper surface of the limit groove, and fit their inner arc surface to the outer surface of the push cylinder.

[0015] Preferably, the upper surface of the rotating clamping bar is provided with friction lines corresponding to the upper surface of the limiting groove, the limiting shaft is a steel structure, and the limiting shaft is coated with lubricating oil.

[0016] The beneficial effects of the present invention are as follows: the valve body is easy to install, the pressure of the pressure regulating valve can be adjusted, the adaptability is strong, the valve can act on different working environments, and the practicality is strong:

[0017] (1) The present invention is provided with a connecting pipe. By connecting the pipe to the sealing groove, the gap between the moving block and the clamping plate is reduced by rotating the clamping bolt, so that the clamping ring is fastened to the pipe. The advancing bolt rotates on the tightening column through the advancing thread, driving the moving block to move toward the connecting pipe. The moving block drives the clamping plate and the clamping ring to move, and the pipe is inserted into the sealing groove and fixed. During the installation of the pipe, it can be achieved by simply rotating the advancing bolt and the clamping bolt.

[0018] (2) The present invention is provided with a pressure chamber, and the fixed block is pushed forward by the pushing handle, so that the rotating card strip on the fixed block moves in the slide groove through the limiting shaft. The upper surface of the rotating card strip corresponds to the upper surface of the limiting groove. During the downward movement of the fixed block, the air pressure plug presses down the pressure chamber, so that the rotating card strip moves to different limiting grooves in the pressure chamber to different pressure levels.

[0019] (3) The present invention is provided with a rotating clamping strip. The upper surface of the rotating clamping strip corresponds to the upper surface of the limit groove. The position of the push handle is kept unchanged. The four rotating clamping strips are rotated to fit their upper surfaces to the upper surface of the limit groove and their inner arc surfaces to the outer surface of the push cylinder. After the position of the rotating clamping strip is fixed, the air pressure plug is fixed to keep the pressure in the pressure chamber stable, and the pressure in the piston and the valve stem is kept stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is an overall schematic diagram of the present invention;

[0022] Figure 2 is a cross-sectional view of the present invention;

[0023] Figure 3 It is an enlarged view of point A of the present invention;

[0024] Figure 4 This is a schematic diagram of the chute of the present invention;

[0025] Figure 5 It is a schematic diagram of the moving block of the present invention;

[0026] Markings in the figure are: 1 valve body, 2 connecting pipe, 3 fixing ring, 4 stabilizing seat, 5 connecting pipe, 6 tightening column, 7 moving block, 8 clamping ring, 9 pushing bolt, 10 clamping bolt, 11 connecting flange, 12 fixing bolt, 13 cylinder barrel, 14 pneumatic cylinder, 15 pushing cylinder, 16 pushing column, 17 pushing handle, 18 slide groove, 19 limit block, 20 limit groove, 21 rotating clip, 22 fixing block, 23 pneumatic column, 24 pneumatic plug, 25 pressure chamber, 26 piston rod, 27 piston, 28 moving chamber, 29 dust ring, 30 valve stem, 31 guide sleeve, 32 valve seat core, 33 valve seat, 34 stabilizing groove, 35 stabilizing column, 36 sealing groove, 37 pushing thread, 38 clamping plate, 39 limit shaft, 40 valve hole. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with specific embodiments. These embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The structural features of the present invention will now be described in detail with reference to the accompanying drawings.

[0029] See also Figure 1-5A pressure-adjustable self-operated pressure regulating valve includes a valve body 1, a connecting pipe 2, a cylinder barrel 13, a pneumatic cylinder 14, and a propulsion cylinder 15. The valve body 1 is fixedly connected to symmetrical connecting pipes 2 on both sides. The outer side of the connecting pipe 2 is provided with a sealing groove 36, which is connected to the external pipeline through the sealing groove 36. A fixing ring 3 is fixed on the surface of the connecting pipe 2, and the tightening column 6 is fixed by the fixing ring 3. The fixing ring 3 is evenly fixed with the tightening column 6. The surface of the tightening column 6 is provided with a propulsion thread 37. The tightening column 6 carries a moving block 7 and a pushing bolt 9. A moving block 7 is slidingly provided on the tightening column 6. The moving block 7 slides on the tightening column 6 to drive the movement of the clamping ring 8. The other side of the moving block 7 is slidingly connected to the pushing bolt 9 connected to the tightening column 6 by a thread. The sliding of the moving block 7 is achieved by rotating the pushing bolt 9 on the pushing thread 37. The two sides of the moving block 7 are connected to the clamping pieces 38 by the clamping bolts 10. The clamping piece 38 is fixedly connected to the clamping ring 8, and the pipe is clamped by the clamping ring 8.

[0030] See also Figure 2 , a propulsion column 16 is provided in the propulsion cylinder 15, and a propulsion handle 17 is fixed at one end of the propulsion column 16 outside the propulsion cylinder 15, and the propulsion column 16 is pushed by the propulsion handle 17, and the other end of the propulsion column 16 is fixedly connected to a fixed block 22, and the limit shaft 39 and the air pressure column 23 are connected through the fixed block 22. The lower surface of the fixed block 22 is fixedly connected to the air pressure column 23, and the other end of the air pressure column 23 is fixedly connected to a pneumatic plug 24, and the pressure in the pressure chamber 25 is adjusted by the pneumatic plug 24. The pneumatic plug 24 is located in the pressure chamber 25 of the pneumatic cylinder 14, and the pneumatic cylinder 14 is fixedly connected to the cylinder barrel 13. The pressure chamber 25 is tightly connected to the motion chamber 28, and the motion space of the piston 27 is provided through the motion chamber 28. A piston rod 26 is slidingly provided in the motion chamber 28, and a piston 27 is fixedly provided on the upper surface of the piston rod 26. The piston rod 26 is also fixedly provided with a piston rod 26. One end is fixedly connected to a valve stem 30, which is connected to a stabilizing column 35 through the valve stem 30. The piston rod 26 is fixedly provided with a dust ring 29 at the connection between the valve stem 30, and the dust ring 29 prevents debris from entering the cylinder 13. The lower surface of the cylinder 13 is fixedly connected to a connecting flange 11, and the connecting flange 11 is connected to a connecting pipe 5 through a fixing bolt 12. The cylinder 13 is fixed to the connecting pipe 5, and a guide sleeve 31 is fixed in the connecting pipe 5. The valve stem 30 passes through the guide sleeve 31, and the valve stem 30 is limited by the guide sleeve 31. The valve body 1 is fixedly provided with a valve seat 33 that divides its interior, and the valve body 1 is divided into two air chambers by the valve seat 33. The valve seat 33 is provided with a valve hole 40 corresponding to the valve stem 30. The valve hole 40 and the valve seat core 32 cooperate to form a valve, and the valve stem 30 is fixed with a valve seat core 32 that matches it at the valve hole 40.

[0031] See also Figure 4The thrust cylinder 15 is provided with a slide groove 18 at the position corresponding to the fixed block 22, and the slide groove 18 provides movement space for the limit shaft 39. A limit block 19 with a length matching that of the slide groove 18 is fixed on one side of the limit block 19. Limit grooves 20 are evenly provided on the limit block 19, and the rotating clip 21 is fixed by the limit groove 20. The fixed block 22 is located on one side of the slide groove 18 and is fixed with a limit shaft 39. The rotating clip 21 can be rotated horizontally through the limit shaft 39. The limit shaft 39 is connected to the rotating clip 21 through a rotating shaft, and the position of the fixed block 22 is fixed by the rotating clip 21. The thickness of the rotating clip 21 matches the limit groove 20, so that the rotating clip 21 can be stuck in the limit groove 20.

[0032] See also Figure 5 A gap is provided between the clamping piece 38 and the moving block 7 through the clamping bolt 10, so that the clamping ring 8 is in a separated rotation state. The clamping ring 8 has toughness and a friction pattern is provided on the inner surface. When the clamping bolt 10 is tightened and the clamping ring 8 is tightened, there is a large friction force between it and the outside of the pipe. The sealing groove 36 matches the pipe connected to the connecting pipe 2, and a sealing gasket is provided inside, so that the pipe can be inserted into the sealing groove 36 to maintain a sealed state.

[0033] See also Figure 2 The air pressure plug 24 is tightly connected to the inner side of the pressure chamber 25, and the piston 27 is tightly connected to the inner side of the motion chamber 28, so that the pressure chamber 25 remains in a sealed state.

[0034] See also Figure 2 The dust ring 29 is slidably connected to the inner wall of the motion chamber 28 so that it can play a protective blocking role, and a water retaining ring is provided in the guide sleeve 31 to prevent liquid from entering the cylinder barrel 13.

[0035] See also Figure 2 A stabilizing seat 4 is fixedly provided on the lower surface of the valve body 1, and a stabilizing groove 34 is supported by the stabilizing seat 4. The stabilizing seat 4 is located in the valve body 1 at a position corresponding to the piston rod 26 and is provided with a stabilizing groove 34. A stabilizing column 35 is placed in the stabilizing groove 34, and the piston rod 26 is fixed with a stabilizing column 35 at a position corresponding to the stabilizing groove 34. The stabilizing column 35 cooperates with the limiting sleeve 20 in the stabilizing groove 34 to keep the valve stem 30 stable.

[0036] See also Figure 4 The upper surface of the rotating clip 21 corresponds to the upper surface of the limiting groove 20 and is provided with friction lines, so that when the rotating clip 21 is in the limiting groove 20, the upward pressure brought by the fixed block 22 prevents it from moving in the limiting groove 20. The limiting shaft 39 is a steel structure to prevent the limiting shaft 39 from collapsing under the action of pressure, and the limiting shaft 39 is coated with lubricating oil to enable the rotating clip 21 to rotate freely.

[0037] The pressure-adjustable self-operated pressure regulating valve and the use method thereof of the present invention have convenient valve body installation, the pressure of the pressure regulating valve can be adjusted, the valve has strong adaptability, can act on different working environments, is highly practical, and is suitable for promotion.

[0038] For specific use, see Figure 1 、 3 5. Place the valve body 1 in the designated position through the stabilizing seat 4. Connect the pipe to the sealing groove 36 and rotate the clamping bolt 10 to reduce the gap between the moving block 7 and the clamping piece 38, so that the clamping ring 8 is fastened to the pipe. The advancing bolt 9 rotates on the tightening column 6 through the advancing thread 37, driving the moving block 7 to move toward the connecting pipe 2. The moving block 7 drives the clamping piece 38 and the clamping ring 8 to move, and the pipe is inserted into the sealing groove 36 and fixed. During the installation of the pipe, it is only necessary to rotate the advancing bolt 9 and the clamping bolt 10 to achieve the desired effect.

[0039] See also Figure 2 After the pipe is fixed on the connecting pipe 2, the pushing handle 17 is used to push the fixing block 22, so that the rotating clamping strip 21 on the fixing block 22 moves in the slide groove 18 through the limiting shaft 39. The upper surface of the rotating clamping strip 21 corresponds to the upper surface of the limiting groove 20. During the downward movement of the fixing block 22, the air pressure plug 24 presses down the pressure chamber 25, so that the rotating clamping strip 21 moves to different limiting grooves 20 and the pressure chamber 25 has different pressure levels.

[0040] See also Figure 4 After the pressure in the pressure chamber 25 is determined, the upper surface of the rotating card strip 21 corresponds to the upper surface of the limiting groove 20, the position of the pushing handle 17 remains unchanged, and the four rotating card strips 21 are rotated to fit their upper surfaces to the upper surface of the limiting groove 20, and their inner arc surfaces are fit to the outer surface of the pushing cylinder 15. The upper surface of the rotating card strip 21 corresponds to the upper surface of the limiting groove 20 and is provided with friction lines. When the rotating card strip 21 is in the limiting groove 20, the upward pressure brought by the fixed block 22 prevents it from moving in the limiting groove 20, and the limiting shaft 39 is smeared with lubricating oil to make the rotating card strip The strip 21 can rotate freely. After the position of the rotating clamping strip 21 is fixed, the air pressure plug 24 is fixed, so that the pressure in the pressure chamber 25 remains stable, the pressure in the piston 27 and the valve stem 30 remains stable, and the pressure brought by the valve seat core 32 remains constant. When it is necessary to change the pressure on the valve seat core 32, lubricating oil is applied to the limit shaft 39 so that the rotating clamping strip 21 can rotate freely. The rotating clamping strip 21 can be disengaged from the limit groove 20 to release it, so that the fixed block 22 can move freely in the thrust cylinder 15 to adjust the pressure in the pressure chamber 25.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pressure-adjustable self-operated pressure regulating valve, comprising a valve body (1), a connecting pipe (2), a cylinder barrel (13), a pneumatic cylinder (14), and a propulsion cylinder (15), characterized in that: The valve body (1) is fixedly connected with symmetrical connecting pipes (2) on both sides, and a sealing groove (36) is provided on the outer side of the connecting pipe (2). A fixing ring (3) is fixedly provided on the surface of the connecting pipe (2), and a tightening column (6) is evenly fixed on the fixing ring (3). A pushing thread (37) is provided on the surface of the tightening column (6). A moving block (7) is slidably provided on the tightening column (6), and a pushing bolt (9) connected to the tightening column (6) by a thread is slidably connected on the other side of the moving block (7). A clamping plate (38) is connected to both sides of the moving block (7) by a clamping bolt (10), and the clamping plate (38) is fixedly connected to a clamping ring (8); The propulsion cylinder (15) is provided with a propulsion column (16), and one end of the propulsion column (16) outside the propulsion cylinder (15) is fixedly provided with a propulsion handle (17), and the other end of the propulsion column (16) is fixedly connected to a fixed block (22), and the lower surface of the fixed block (22) is fixedly connected to a pneumatic column (23), and the other end of the pneumatic column (23) is fixedly connected to a pneumatic plug (24), and the pneumatic plug (24) is located in a pressure chamber (25) of the pneumatic cylinder (14), and the pneumatic cylinder (14) is fixedly connected to the cylinder barrel (13), and the pressure chamber (25) is sealed and connected to the motion chamber (28), and a piston rod (26) is slidably provided in the motion chamber (28), and a piston rod (26) is fixedly provided on the upper surface of the piston rod (26). (27), the other end of the piston rod (26) is fixedly connected to the valve stem (30), the piston rod (26) is fixedly provided with a dust ring (29) at the connection position of the valve stem (30), the lower surface of the cylinder barrel (13) is fixedly connected to a connecting flange (11), the connecting flange (11) is connected to a connecting pipe (5) through a fixing bolt (12), a guide sleeve (31) is fixedly provided in the connecting pipe (5), the valve stem (30) passes through the guide sleeve (31), the valve body (1) is fixedly provided with a valve seat (33) for dividing the interior thereof, the valve seat (33) is provided with a valve hole (40) corresponding to the valve stem (30), and the valve stem (30) is fixedly provided with a valve seat core (32) matching therewith at the valve hole (40); The propulsion cylinder (15) is provided with a slide groove (18) at a position corresponding to the fixed block (22), a limit block (19) having a length matching the slide groove (18) is fixedly provided on one side of the slide groove (18), and limit grooves (20) are evenly provided on the limit block (19). The fixed block (22) is located on one side of the slide groove (18) and is fixedly provided with a limit shaft (39), and the limit shaft (39) is connected to a rotating clip (21) via a rotating shaft, and the thickness of the rotating clip (21) matches the limit groove (20).

2. A pressure-adjustable self-operated pressure regulating valve according to claim 1, characterized in that: A gap is provided between the clamping piece (38) and the moving block (7) via the clamping bolt (10); the clamping ring (8) has toughness and a friction pattern is provided on the inner surface; the sealing groove (36) matches the pipe connected to the connecting pipe (2) and a sealing gasket is provided inside.

3. The pressure-adjustable self-operated pressure regulating valve according to claim 1, characterized in that: The air pressure plug (24) is tightly connected to the inner side of the pressure chamber (25), and the piston (27) is tightly connected to the inner side of the movement chamber (28).

4. The pressure-adjustable self-operated pressure regulating valve according to claim 1, characterized in that: The dustproof ring (29) is slidably connected to the inner side wall of the motion chamber (28), and a water retaining ring is provided in the guide sleeve (31).

5. The pressure-adjustable self-operated pressure regulating valve according to claim 1, characterized in that: A stabilizing seat (4) is fixedly provided on the lower surface of the valve body (1); a stabilizing groove (34) is provided on the stabilizing seat (4) at a position corresponding to the piston rod (26) in the valve body (1); and a stabilizing column (35) is fixedly provided on the position of the piston rod (26) corresponding to the stabilizing groove (34).

6. A method for using the pressure-adjustable self-operated pressure regulating valve according to claim 1, characterized by comprising the following steps: 1) Installation: When the pipe is connected to the sealing groove (36), rotate the clamping bolt (10) to reduce the gap between the moving block (7) and the clamping plate (38), tighten the clamping ring (8) to the pipe, and push the bolt (9) to rotate on the tightening column (6) to drive the moving block (7) to move toward the connecting pipe (2), and insert the pipe into the sealing groove (36) to fix it; 2) Adjusting the pressure: Pushing the fixed block (22) with the pushing handle (17) moves the rotating clip (21) on the fixed block (22), so that the upper surface of the rotating clip (21) corresponds to the upper surface of the limiting groove (20), and the rotating clip (21) moves to different pressure levels in the pressure chamber (25) of different limiting grooves (20); 3) Fixing: When the upper surface of the rotating card strip (21) corresponds to the upper surface of the limiting groove (20), keep the position of the propulsion handle (17) unchanged, rotate the four rotating card strips (21), fit their upper surfaces to the upper surface of the limiting groove (20), and fit their inner arc surfaces to the outer surface of the propulsion cylinder (15).

7. The method for using a pressure-adjustable self-operated pressure regulating valve according to claim 6, characterized in that: The upper surface of the rotating clamping strip (21) is provided with friction lines corresponding to the upper surface of the limiting groove (20), and the limiting shaft (39) is a steel structure, and the limiting shaft (39) is coated with lubricating oil.

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