Self-acting pressure regulating valve for fluid control

Abstract

The application discloses a self-operated pressure regulating valve for fluid control, and relates to the field of self-operated pressure regulating valves.The self-operated pressure regulating valve is characterized in that a conical block of a top disc is matched with a slope of an inner sliding plate, when fluid in a leading-out pipeline is introduced into the inside of a top cavity cover through a pipeline, the fluid impacts downward on the top disc, the top disc compresses a rubber pad to deform and compress, when the top disc moves downward in the inside of the inner sliding disc, the top disc pushes outward the inner sliding plate, the inner sliding plate extrudes a sealing ring, the adhering pressure between the sealing ring and the inner wall of the top cavity cover is increased, the sealing effect is improved, the inner sliding disc reciprocates up and down due to the fluctuation of fluid pressure in the leading-out pipeline during use, the sealing ring is abraded during the reciprocating movement, the adhering pressure is reduced, fluid flows through the gap between the inner sliding disc and the top cavity cover, and leakage is caused.

Description

Technical Field

[0001] Specifically, this invention relates to a self-operated pressure regulating valve for fluid control, and pertains to the field of self-operated pressure regulating valves. Background Technology

[0002] A self-operated pressure regulating valve is a type of valve that does not require an external power source or air source. It relies entirely on the pressure of the medium being transported as its own power to automatically adjust the valve opening and stabilize the pressure before or after the valve at the set value. The self-operated pressure regulating valve with publication number CN118654155B includes a valve body and side connecting pipes movably installed at both ends of the valve body. An elliptical mounting plate is fixedly installed on the top of the valve body. By rotating the adjustment handwheel, the threaded rod is driven to rise and fall on the mounting bracket, thereby driving the lifting cover to move on the upper shell, changing the volume of the structure composed of the upper shell and the lifting cover. The volume difference between the lifting cover and the upper shell and the lower shell also changes, thereby realizing the adjustment of the pressure difference between the upper and lower parts of the rubber diaphragm. When dealing with liquids with excessively fast flow rates, the volume of the structure composed of the upper shell and the lifting cover can be changed to adapt to liquids with different flow rates. Appropriate adjustment of the pressure difference can make the liquid transport in pipelines or equipment smoother and more efficient, reduce the risk of liquid blockage or stagnation, and enable the system to maintain a relatively stable operating state under different pressure difference conditions, reducing fluctuations and failures. In existing equipment, the sliding component inside the actuator moves up and down repeatedly as the pipeline pressure fluctuates. During this movement, wear occurs between the sliding component and the inner wall of the cavity, resulting in gaps. When the fluid pressure is high, the fluid can enter the area below the sliding component through these gaps, causing pressure differences and affecting pressure regulation. Summary of the Invention

[0003] To address the aforementioned problems, a technical solution is proposed: a self-operated pressure regulating valve for fluid control, comprising: A valve body mechanism, wherein a support mechanism is fixedly installed on the top of the valve body mechanism, and a valve core mechanism is installed inside the valve body mechanism, and an actuator is fixedly installed on the top of the support mechanism; The actuator includes a support base, a bottom cavity cover fixedly mounted on the top of the support base, a top cavity cover fixedly mounted on the top of the bottom cavity cover, an upper limit ring and a lower limit ring fixedly mounted on the inner wall of the top cavity cover, the upper limit ring being located above the lower limit ring, and an inner sliding plate slidably mounted on the inner wall of the top cavity cover, the inner sliding plate being located between the upper limit ring and the lower limit ring. The upper limit ring and the lower limit ring cooperate to control the sliding range of the inner sliding plate, preventing it from passing through the connection gap between the top cavity cover and the bottom cavity cover when the fluid pressure inside the outlet pipeline is too high, thus preventing fluid leakage. Furthermore, an annular groove is formed on the outer side of the inner sliding plate, and a sealing ring is engaged at the annular groove. An inner sliding plate is slidably mounted on the inner wall of the inner sliding plate, the inner sliding plates being evenly installed on the inner wall of the inner sliding plate, with their ends close to each other. The inner sliding plate has an inclined surface, with one end of the inner sliding plate away from the other fitting against the inner wall of the sealing ring. A top plate is slidably mounted on the inner wall of the inner sliding plate. A conical block is located at the center of the bottom of the top plate, and the outer side of the conical block fits against the inclined surface of the inner sliding plate. Through the cooperation between the conical block of the top plate and the inclined surface of the inner sliding plate, when the fluid in the outlet pipe is introduced into the interior of the top cavity cover through the pipe, it impacts the top plate downward, causing the top plate to compress the rubber pad. When the top plate moves downward inside the inner sliding plate, it pushes the inner sliding plate outward, causing the inner sliding plate to squeeze the sealing ring. This increases the contact pressure between the sealing ring and the inner wall of the top cavity cover, improving the sealing effect. This prevents the inner sliding plate from reciprocating during use due to fluctuations in the fluid pressure of the outlet pipe. During this movement, the sealing ring may wear down, leading to a decrease in contact pressure and causing the fluid to flow through the gap between the inner sliding plate and the top cavity cover, resulting in leakage. A rubber pad is fixedly installed between the bottom of the top plate and the inner sliding plate.

[0004] Preferably, a connecting pipe is fixedly installed on the top of the top cavity cover, and a connecting shaft is fixedly installed at the center of the bottom of the inner slide plate, with the bottom end of the connecting shaft penetrating the bottom cavity cover and extending to its bottom.

[0005] Preferably, the valve body mechanism includes a valve seat, a partition plate is fixedly installed on the inner wall of the valve seat, a circular groove is opened at the center of the top of the partition plate, a sealing seat is fixedly installed at the circular groove of the partition plate, the inner wall of the sealing seat has a stepped structure, annular grooves are opened at each of the stepped structures of the inner wall of the sealing seat, and a sealing gasket is fixedly installed at each of the annular grooves of the sealing seat, the sealing gasket being made of rubber material.

[0006] Preferably, the valve core mechanism includes a fixed cylinder, which is fixedly installed on the inner wall of the valve seat. A fixed ring is fixedly installed on the inner wall of the fixed cylinder, and an inner retaining sleeve is installed on the top of the fixed ring. The outer side of the inner retaining sleeve is in contact with the inner wall of the fixed cylinder. An inner sliding sleeve is slidably installed on the bottom of the inner wall of the fixed cylinder. A rubber ring is fixedly installed between the inner sliding sleeve and the fixed ring. An outer cover is fixedly installed on the outer side of the inner sliding sleeve. Through the cooperation of the inner sliding sleeve and the fixed ring, when the fluid pressure inside the valve body is large, the fluid pressure pushes the inner sliding sleeve upward through the concave conical surface at the bottom of the inner sliding sleeve, causing the inner sliding sleeve to move upward inside the fixed cylinder. During the upward movement, the fixed ring fixes and restricts the rubber ring on the top, causing the rubber ring to be squeezed and deformed when the inner sliding sleeve moves upward. During the deformation process, the rubber ring fills the gap with the outer side of the valve stem, thereby regulating the sealing pressure, preventing fluid leakage, and improving the sealing performance. The inner wall of the outer cover is in contact with the outer side of the fixed cylinder.

[0007] Preferably, the bottom of the inner sliding sleeve is a concave conical surface, and a valve stem is slidably installed on the inner wall of the inner sleeve. The inner wall of the fixing ring and the inner wall of the inner sliding sleeve are both in contact with the outer side of the valve stem. A sealing disc is fixedly installed at the bottom of the valve stem. The bottom of the sealing disc is uniformly provided with a stepped structure, and the stepped structure of the sealing disc is adapted to the stepped structure of the sealing seat. Through the cooperation of the stepped structure of the sealing disc and the stepped structure of the sealing seat, when the outlet pipe is blocked and the pressure in the pipe increases, the sealing disc moves downward and squeezes against the inner wall of the sealing seat to seal the passage and restrict the fluid in the inlet pipe from entering the outlet pipe. At the same time, during sealing, the convex ring of the stepped structure of the sealing disc corresponds to the sealing gasket ring, and the sealing gasket ring is squeezed during sealing. With the help of the stepped structure, the tortuosity of the sealing gap is increased, and the sealing effect is improved. The stepped surface of the sealing disc is provided with convex rings, and the convex rings correspond to the sealing gasket rings.

[0008] Preferably, the support mechanism includes a fixed plate and a connecting plate. The fixed plate is fixedly installed on the top of the valve seat, and support rods are fixedly installed on both sides of the top of the fixed plate. The top of the connecting plate is fixedly connected to the bottom of the connecting shaft. The top of the support rod is fixedly connected to the bottom of the support seat. A threaded cylinder is fixedly installed on the top of the fixed plate. A threaded disc is threadedly connected to the outer side of the threaded cylinder. A rod hole is opened on the outer side of the threaded disc. A retaining cover is rotatably installed on the opposite surfaces of the threaded disc and the connecting plate. A first spring and a second spring are fixedly installed between the retaining covers. The first spring is located inside the second spring. The center position of the bottom of the connecting plate is fixedly connected to the top of the valve stem.

[0009] This invention provides a self-operated pressure regulating valve for fluid control, which has the following advantages: (i) By engaging the conical block of the top plate with the inclined surface of the inner sliding plate, when the fluid in the outlet pipe is introduced into the interior of the top cavity cover through the pipe, it impacts the top plate downwards, causing the rubber pad of the top plate to deform and compress. When the top plate moves downwards inside the inner sliding plate, it pushes the inner sliding plate outwards, causing the inner sliding plate to squeeze the sealing ring, increasing the contact pressure between the sealing ring and the inner wall of the top cavity cover, improving the sealing effect, and preventing the inner sliding plate from reciprocating up and down during use due to fluctuations in the fluid pressure of the outlet pipe. During the movement, the sealing ring wears down, resulting in a decrease in contact pressure, allowing the fluid to flow through the gap between the inner sliding plate and the top cavity cover, leading to leakage.

[0010] (ii) By cooperating with the upper limit ring and the lower limit ring, the sliding range of the inner sliding plate is controlled to prevent the inner sliding plate from passing through the connection gap between the top cavity cover and the bottom cavity cover when sliding. If the fluid pressure inside the outlet pipeline is too high, the fluid will leak out through the connection gap between the top cavity cover and the bottom cavity cover, resulting in fluid leakage.

[0011] (III) By cooperating with the inner sliding sleeve and the fixed ring, when the fluid pressure inside the valve body is large, the fluid pressure pushes the inner sliding sleeve upward through the concave conical surface at the bottom of the inner sliding sleeve, causing the inner sliding sleeve to move upward inside the fixed cylinder. During the upward movement, the fixed ring fixes and restricts the rubber ring at the top, causing the rubber ring to be squeezed and deformed when the inner sliding sleeve moves upward. During the deformation process, the rubber ring fills the gap with the outside of the valve stem, thereby regulating the sealing pressure, preventing fluid leakage, and improving the sealing performance.

[0012] (iv) By combining the stepped structure of the sealing disc with the stepped structure of the sealing seat, when the outlet pipe is blocked and the pressure in the pipe increases, the sealing disc moves downward and squeezes against the inner wall of the sealing seat to seal the passage and restrict the fluid in the inlet pipe from entering the outlet pipe. At the same time, during sealing, the convex ring of the stepped structure of the sealing disc corresponds with the sealing gasket ring, and the sealing gasket ring is squeezed during sealing. In combination with the stepped structure, the tortuosity of the sealing gap is increased, and the sealing effect is improved. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 This is a sectional view of the valve body mechanism of the present invention; Figure 4 This is a sectional side view of the valve body mechanism of the present invention; Figure 5 This is a schematic diagram of the valve core mechanism of the present invention; Figure 6 This is a partial sectional view of the valve core mechanism of the present invention; Figure 7 This is a schematic diagram of the support mechanism of the present invention; Figure 8 This is a sectional view of the actuator of the present invention; Figure 9 This is a partial structural cross-sectional view of the actuator of the present invention.

[0014] In the diagram: 1. Valve body mechanism; 2. Valve core mechanism; 3. Support mechanism; 4. Actuator; 11. Valve seat; 12. Divider plate; 13. Sealing seat; 14. Sealing gasket ring; 21. Valve stem; 22. Fixed cylinder; 23. Sealing disc; 24. Inner retaining sleeve; 25. Fixed ring; 26. Inner sliding sleeve; 27. Rubber ring; 28. Outer cover; 31. Fixed disc; 32. Support rod; 33. Connecting disc; 34. First spring; 35. Threaded disc; 36. Threaded cylinder; 37. Second spring; 38. Retaining cover; 401. Support seat; 402. Bottom cavity cover; 403. Connecting shaft; 404. Top cavity cover; 405. Upper limit ring; 406. Lower limit ring; 407. Top plate; 408. Connecting pipe; 409. Inner sliding disc; 410. Sealing ring; 411. Rubber gasket; 412. Inner sliding plate. Detailed Implementation

[0015] Example 1, Reference Figures 1 to 2 and Figures 8 to 9 The present invention provides the following technical solution: A self-operated pressure regulating valve for fluid control, comprising: Valve body mechanism 1, a support mechanism 3 is fixedly installed on the top of valve body mechanism 1, and a valve core mechanism 2 is installed inside valve body mechanism 1. An actuator 4 is fixedly installed on the top of support mechanism 3. The actuator 4 includes a support base 401, a bottom cavity cover 402 fixedly mounted on the top of the support base 401, a top cavity cover 404 fixedly mounted on the top of the bottom cavity cover 402, and an upper limit ring 405 and a lower limit ring 406 fixedly mounted on the inner wall of the top cavity cover 404. A connecting pipe 408 connects to an outlet pipe. During fluid delivery, the fluid in the outlet pipe is introduced through the connecting pipe 408 into the cavity formed by the top cavity cover 404 and the bottom cavity cover 402. Simultaneously, the fluid impacts the top of the top plate 407. When the pressure in the outlet pipe exceeds the support base... After the pressure set by mechanism 3, the inner sliding plate 409 slides downward between the upper limit ring 405 and the lower limit ring 406. During the downward movement, the supporting mechanism 3 is driven to move downward through the connecting shaft 403, which in turn drives the valve core mechanism 2 to move downward inside the valve body mechanism 1, reducing the opening gap of the regulating valve and reducing the fluid pressure in the outlet pipeline. The upper limit ring 405 is located above the lower limit ring 406. The inner sliding plate 409 is slidably installed on the inner wall of the top cavity cover 404. The inner sliding plate 409 is located between the upper limit ring 405 and the lower limit ring 406, and the inner sliding plate 409... An annular groove is provided on the outer side of the inner sliding plate 409. A sealing ring 410 is engaged with the annular groove of the inner sliding plate 409. An inner sliding plate 412 is slidably installed on the inner wall of the inner sliding plate 409. The inner sliding plates 412 are evenly installed on the inner wall of the inner sliding plate 409, and the ends of the inner sliding plates 412 that are close to each other are inclined, while the ends of the inner sliding plates 412 that are far apart from each other are in contact with the inner wall of the sealing ring 410. When the fluid pressure impacts the top of the top plate 407, the pressure pushes the top plate 407 to compress the rubber pad 411, and at the same time, the top plate 407 slides downward on the inner wall of the inner sliding plate 409. As the top plate 407 moves downward, the tapered block at the bottom of the top plate 407 and the inclined surface of the inner slide plate 412 come into contact with each other. This causes the top plate 407 to push the inner slide plate 412 outward and squeeze the sealing ring 410, increasing the contact pressure between the sealing ring 410 and the inner wall of the top cavity cover 404. The top plate 407 is slidably installed on the inner wall of the inner slide plate 412. A tapered block is set at the center of the bottom of the top plate 407, and the outer side of the tapered block is in contact with the inclined surface of the inner slide plate 412. A rubber pad 411 is fixedly installed between the bottom of the top plate 407 and the inner slide plate 409.

[0016] A connecting pipe 408 is fixedly installed on the top of the top cavity cover 404, and a connecting shaft 403 is fixedly installed at the center of the bottom of the inner slide plate 409. The bottom end of the connecting shaft 403 passes through the bottom cavity cover 402 and extends to its bottom.

[0017] Example 2, based on Example 1, with reference to Figures 3 to 6The valve body mechanism 1 includes a valve seat 11. A partition plate 12 is fixedly installed on the inner wall of the valve seat 11. A circular groove is opened at the center of the top of the partition plate 12. A sealing seat 13 is fixedly installed at the circular groove of the partition plate 12. The inner wall of the sealing seat 13 has a stepped structure. It is connected to the fluid pipeline through both ends of the valve seat 11. At the same time, the partition plate 12 separates the pipelines at both ends and provides a flow path for the fluid in the pipeline through the sealing seat 13. During the flow process, the sealing seat 13 cooperates with the sealing disc 23. By using the stepped structure, the width of the flow path is controlled as the sealing disc 23 moves up and down. The stepped structure of the inner wall of the sealing seat 13 has annular grooves, and a sealing gasket 14 is fixedly installed in the annular groove of the sealing seat 13. The sealing gasket 14 is made of rubber.

[0018] The valve core mechanism 2 includes a fixed cylinder 22, which is fixedly installed on the inner wall of the valve seat 11. A fixed ring 25 is fixedly installed on the inner wall of the fixed cylinder 22. An inner retaining sleeve 24 is installed on the top of the fixed ring 25. The outer side of the inner retaining sleeve 24 is in contact with the inner wall of the fixed cylinder 22. An inner sliding sleeve 26 is slidably installed on the bottom of the inner wall of the fixed cylinder 22. A rubber ring 27 is fixedly installed between the inner sliding sleeve 26 and the fixed ring 25. An outer cover cylinder 28 is fixedly installed on the outer side of the inner sliding sleeve 26. The inner wall of the outer cover cylinder 28 is in contact with the outer side of the fixed cylinder 22.

[0019] The bottom of the inner sleeve 26 is a concave conical surface. A valve stem 21 is slidably mounted on the inner wall of the inner retaining sleeve 24. The inner walls of the fixing ring 25 and the inner sleeve 26 are both in contact with the outer side of the valve stem 21. A sealing disc 23 is fixedly mounted at the bottom end of the valve stem 21. The valve stem 21 connects to the connecting disc 33 and the sealing disc 23. During pressure adjustment, the connecting disc 33 drives the valve stem 21 to slide on the inner wall of the inner retaining sleeve 24. Simultaneously, during the sliding process, the sealing disc 23 moves up and down. During the upward movement, [the pressure is increased / decreased]. When the valve body mechanism 1 moves downward, the sealing disc 23 penetrates into the conduction position of the valve body mechanism 1, reducing the opening width of the conduction path of the valve body mechanism 1, reducing the flow rate of the conduction path, reducing the flow rate in the inlet and outlet pipes, and reducing the fluid pressure in the outlet pipe. The bottom of the sealing disc 23 is uniformly provided with a stepped structure, and the stepped structure of the sealing disc 23 is adapted to the stepped structure of the sealing seat 13. The stepped surfaces of the sealing disc 23 are all provided with convex rings, and the convex rings correspond to the sealing gasket ring 14.

[0020] Example 3, based on Examples 1 and 2, with reference to Figure 7The support mechanism 3 includes a fixed plate 31 and a connecting plate 33. The fixed plate 31 is fixedly installed on the top of the valve seat 11, and support rods 32 are fixedly installed on both sides of the top of the fixed plate 31. By inserting the rod into the rod hole of the threaded plate 35, the threaded plate 35 is rotated, and the height of the threaded plate 35 is changed by utilizing the threaded connection between the threaded plate 35 and the threaded cylinder 36. The top of the connecting plate 33 is fixedly connected to the bottom of the connecting shaft 403, and the top of the support rod 32 is fixedly connected to the bottom of the support base 401. The threaded cylinder 36 is fixedly installed on the top of the fixed plate 31, and the threaded plate 35 is threadedly connected to the outer side of the threaded cylinder 36. The outer side of the threaded plate 35 has a rod hole, and the opposite surfaces of the threaded plate 35 and the connecting plate 33 are rotatably mounted with rods 32. A first spring 34 and a second spring 37 are fixedly installed between the retaining covers 38. The first spring 34 is located inside the second spring 37. When the pressure is increased, the threaded disc 35 moves upward, bringing the retaining covers 38 closer together and increasing the degree of compression deformation of the first spring 34 and the second spring 37 between the retaining covers 38. When the pressure is decreased, the distance between the retaining covers 38 increases, reducing the degree of compression deformation of the second spring 37 and the first spring 34. During pressure adjustment, the connecting shaft 403 is fixedly connected to the connecting disc 33, causing the connecting disc 33 to move up and down. At the same time, during the movement, the connecting disc 33 drives the valve core mechanism 2 to move. The center position of the bottom of the connecting disc 33 is fixedly connected to the top of the valve stem 21.

[0021] In use, the valve body mechanism 1 is connected to the pipeline, and the actuator 4 is connected to the outlet pipeline through the pipeline. The pressure in the outlet pipeline is used to provide power to the actuator 4. When there is a pressure difference in the pipelines on both sides of the regulating valve, the actuator 4 drives the support mechanism 3, which in turn drives the valve core mechanism 2 to move. This allows the valve core mechanism 2 to cooperate with the valve body mechanism 1 to control the size of the opening of the regulating valve's conduction path.

[0022] In actuator 4, connecting pipe 408 is connected to outlet pipe via a pipeline. During fluid delivery, fluid in outlet pipe is introduced into the cavity formed by top cavity cover 404 and bottom cavity cover 402 through connecting pipe 408. Simultaneously, the fluid impacts the top of top plate 407. When the pressure in outlet pipe exceeds the pressure set by support mechanism 3, inner sliding plate 409 slides downward between upper limit ring 405 and lower limit ring 406. During the downward movement, support mechanism 3 is driven downward by connecting shaft 403, causing support mechanism 3 to drive valve core mechanism 2 within valve body mechanism 1. The lower part moves down, reducing the opening gap of the regulating valve and reducing the fluid pressure in the outlet pipeline. At the same time, when the fluid pressure impacts the top of the top plate 407, the pressure pushes the top plate 407 to compress the rubber pad 411. Simultaneously, the top plate 407 slides down against the inner wall of the inner slide plate 409. During the downward movement, the inclined surface of the bottom conical block of the top plate 407 and the inner slide plate 412 comes into contact with each other, causing the top plate 407 to push the inner slide plate 412 to slide outward and squeeze the sealing ring 410, increasing the contact pressure between the sealing ring 410 and the inner wall of the top cavity cover 404.

[0023] In the support mechanism 3, by inserting the insert rod into the rod hole of the threaded disc 35 and rotating the threaded disc 35, the height of the threaded disc 35 is changed by utilizing the threaded connection between the threaded disc 35 and the threaded cylinder 36. When the pressure is increased, the threaded disc 35 moves upward, bringing the clamping covers 38 closer together and increasing the degree of compression deformation of the first spring 34 and the second spring 37 between the clamping covers 38. When the pressure is decreased, the distance between the clamping covers 38 is increased, reducing the degree of compression deformation of the second spring 37 and the first spring 34. During pressure adjustment, the connecting shaft 403, through its fixed connection with the connecting disc 33, drives the connecting disc 33 to move up and down. At the same time, during the movement, the connecting disc 33 drives the valve core mechanism 2 to move.

[0024] In the valve core mechanism 2, the connecting plate 33 and the sealing plate 23 are connected by the valve stem 21. During pressure adjustment, the connecting plate 33 drives the valve stem 21 to slide on the inner wall of the inner clamping cylinder 24. At the same time, during the sliding process, the sealing plate 23 moves up and down. During the movement, when it moves up, it increases the conduction path with the valve body mechanism 1. When it moves down, the sealing plate 23 goes deeper into the conduction position of the valve body mechanism 1, reduces the opening width of the conduction path of the valve body mechanism 1, reduces the flow rate of the conduction path, reduces the flow rate in the inlet and outlet pipes, and reduces the fluid pressure in the outlet pipe.

[0025] In the valve body mechanism 1, the valve seat 11 is connected to the fluid pipeline at both ends, and the pipeline connection is separated by the partition plate 12. The sealing seat 13 provides a flow path for the fluid in the pipeline. During the flow process, the sealing seat 13 cooperates with the sealing disc 23. The stepped structure controls the width of the flow path as the sealing disc 23 moves up and down.

Claims

1. A self-operated pressure regulating valve for fluid control, characterized in that, include: Valve body mechanism (1), a support mechanism (3) is fixedly installed on the top of the valve body mechanism (1), and a valve core mechanism (2) is installed inside the valve body mechanism (1). An actuator (4) is fixedly installed on the top of the support mechanism (3). The actuator (4) includes a support base (401), a bottom cavity cover (402) is fixedly installed on the top of the support base (401), a top cavity cover (404) is fixedly installed on the top of the bottom cavity cover (402), an upper limit ring (405) and a lower limit ring (406) are fixedly installed on the inner wall of the top cavity cover (404), the upper limit ring (405) is located above the lower limit ring (406), an inner sliding plate (409) is slidably installed on the inner wall of the top cavity cover (404), the inner sliding plate (409) is located between the upper limit ring (405) and the lower limit ring (406), and an annular groove is opened on the outer side of the inner sliding plate (409), and a tight seal is engaged at the annular groove of the inner sliding plate (409). The sealing ring (410) has an inner sliding plate (412) slidably installed on the inner wall of the inner sliding plate (409). The inner sliding plate (412) is evenly installed on the inner wall of the inner sliding plate (409), and the ends of the inner sliding plates (412) that are close to each other are inclined surfaces. The ends of the inner sliding plates (412) that are far apart from each other are in contact with the inner wall of the sealing ring (410). The inner wall of the inner sliding plate (412) has a top plate (407) slidably installed on it. A conical block is provided at the center of the bottom of the top plate (407), and the outer side of the conical block is in contact with the inclined surface of the inner sliding plate (412). A rubber pad (411) is fixedly installed between the bottom of the top plate (407) and the inner sliding plate (409).

2. The self-operated pressure regulating valve for fluid control according to claim 1, characterized in that: A connecting pipe (408) is fixedly installed on the top of the top cavity cover (404), and a connecting shaft (403) is fixedly installed at the center of the bottom of the inner slide plate (409). The bottom end of the connecting shaft (403) passes through the bottom cavity cover (402) and extends to its bottom.

3. A self-operated pressure regulating valve for fluid control according to claim 2, characterized in that: The valve body mechanism (1) includes a valve seat (11), a partition plate (12) is fixedly installed on the inner wall of the valve seat (11), a circular groove is opened at the center of the top of the partition plate (12), a sealing seat (13) is fixedly installed at the circular groove of the partition plate (12), and the inner wall of the sealing seat (13) is a stepped structure. The stepped structure of the inner wall of the sealing seat (13) is provided with annular grooves, and a sealing gasket (14) is fixedly installed in the annular groove of the sealing seat (13). The sealing gasket (14) is made of rubber.

4. A self-operated pressure regulating valve for fluid control according to claim 3, characterized in that: The valve core mechanism (2) includes a fixed cylinder (22), which is fixedly installed on the inner wall of the valve seat (11). A fixed ring (25) is fixedly installed on the inner wall of the fixed cylinder (22), and an inner clamping cylinder (24) is installed on the top of the fixed ring (25). The outer side of the inner clamping cylinder (24) is in contact with the inner wall of the fixed cylinder (22).

5. A self-operated pressure regulating valve for fluid control according to claim 4, characterized in that: An inner sliding sleeve (26) is slidably installed at the bottom of the inner wall of the fixed cylinder (22). A rubber ring (27) is fixedly installed between the inner sliding sleeve (26) and the fixed ring (25). An outer cover cylinder (28) is fixedly installed on the outer side of the inner sliding sleeve (26). The inner wall of the outer cover cylinder (28) is in contact with the outer side of the fixed cylinder (22).

6. A self-operated pressure regulating valve for fluid control according to claim 5, characterized in that: The bottom of the inner sleeve (26) is a concave conical surface. The valve stem (21) is slidably installed on the inner wall of the inner sleeve (24). The inner wall of the fixing ring (25) and the inner wall of the inner sleeve (26) are both in contact with the outer side of the valve stem (21).

7. A self-operated pressure regulating valve for fluid control according to claim 6, characterized in that: A sealing disc (23) is fixedly installed at the bottom of the valve stem (21). The bottom of the sealing disc (23) is uniformly provided with a stepped structure, and the stepped structure of the sealing disc (23) is adapted to the stepped structure of the sealing seat (13). The stepped surfaces of the sealing disc (23) are all provided with convex rings, and the convex rings correspond to the sealing gasket ring (14).

8. A self-operated pressure regulating valve for fluid control according to claim 7, characterized in that: The support mechanism (3) includes a fixed plate (31) and a connecting plate (33). The fixed plate (31) is fixedly installed on the top of the valve seat (11), and support rods (32) are fixedly installed on both sides of the top of the fixed plate (31). The top of the connecting plate (33) is fixedly connected to the bottom of the connecting shaft (403), and the top of the support rod (32) is fixedly connected to the bottom of the support base (401).

9. A self-operated pressure regulating valve for fluid control according to claim 8, characterized in that: A threaded cylinder (36) is fixedly installed on the top of the fixed disk (31). A threaded disc (35) is threadedly connected to the outer side of the threaded cylinder (36). A rod hole is opened on the outer side of the threaded disc (35). A retainer (38) is rotatably installed on the opposite side of the threaded disc (35) and the connecting disk (33).

10. A self-operated pressure regulating valve for fluid control according to claim 9, characterized in that: A first spring (34) and a second spring (37) are fixedly installed between the card covers (38). The first spring (34) is located inside the second spring (37). The center of the bottom of the connecting plate (33) is fixedly connected to the top of the valve stem (21).

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