Double self-tightening valve seat sealing structure under high pressure difference working condition

Abstract

The application relates to the technical field of valves, in particular to a double self-tight type valve seat sealing structure under high pressure difference working conditions, which comprises a valve seat, a valve pipe, a valve rod, an adjusting plug and a valve clack, the valve clack is internally provided with a cavity loaded with compressed liquid, the top surface of the valve clack is annularly provided with a protruding base with a first diaphragm, and the middle part of the valve clack is provided with a rubber ring; the two sides of the valve pipe are vertically provided with side pipes with second diaphragms, the slide base in the side pipes is fixedly provided with a pressure rod, and the inner wall of the valve pipe is provided with a sealing ring with a conical ring; the transverse pipeline of the valve pipe is internally provided with a labyrinth pressure regulating structure, the structure comprises a fixed baffle, a movable baffle installed in an arc-shaped guide groove through a limiting spring and a gear for driving the movable baffle to rotate; the valve clack drives a magnetic base and a ferromagnetic lifting base through a control rod, the lifting base is provided with a rack engaged with the gear; when the upstream medium pressure acts on the first diaphragm, the first diaphragm is deformed to extrude the compressed liquid to make the rubber ring radially expand; and the application can improve the leakage prevention capacity of the valve.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically to a double self-tightening valve seat sealing structure under high pressure differential conditions. Background Technology

[0002] Pneumatic high-pressure control valves are key actuators widely used in industrial automation control systems under high pressure differential conditions, primarily for regulating parameters such as pressure and flow rate of fluid media. Under high pressure differential conditions, the valve seat sealing structure directly determines the valve's leakage level, service life, and the safety of system operation.

[0003] Traditional valve seat sealing structures typically employ a single radial or axial seal, relying on sealing packing, O-rings, or metal hard seals to achieve a seal between the valve stem and seat. Under harsh conditions such as high pressure differentials, high-frequency switching, or media containing particulate matter, these sealing structures often rely solely on static preload or a single media pressure for auxiliary sealing, making it difficult to simultaneously create a seal that automatically strengthens with pressure changes in both the radial and axial directions of the valve stem. Furthermore, when existing valve seats are used under high-pressure conditions, the high pressure differential media can easily cause a sudden impact on downstream equipment during initial opening. Summary of the Invention

[0004] The purpose of this invention is to provide a double self-tightening valve seat sealing structure under high pressure differential conditions to prevent valve leakage and solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a double self-tightening valve seat sealing structure under high pressure differential conditions, comprising a valve seat, a valve tube, a valve stem, an adjusting plug, and a valve disc. The valve disc has a cavity for loading compressed fluid, and protrusions with a first diaphragm are distributed annularly on the top surface of the valve disc. A rubber ring is provided in the middle of the valve disc. Side tubes with second diaphragms are vertically installed on both sides of the valve tube. A pressure rod is fixed to a sliding seat inside the side tube, and a sealing ring with a conical ring is provided on the inner wall of the valve tube. A labyrinth pressure regulating structure is provided in the transverse pipe of the valve tube. This structure includes a fixed baffle, a movable baffle mounted on an arc-shaped guide groove via a limiting spring, and a gear driving the movable baffle to rotate. The valve disc is controlled by... The rod drives the magnetic seat and the ferromagnetic lifting seat, which is equipped with a rack that meshes with the gear. When the upstream medium pressure acts on the first diaphragm, the first diaphragm deforms and squeezes the compressed fluid, causing the rubber ring to expand radially. At the same time, the second diaphragm deforms and pushes the pressure rod down to press the conical ring, so that the sealing ring is axially pressed against the adjusting plug, forming a double self-tightening seal in both the radial and axial directions. When the valve disc moves down to open the valve, the control rod presses down on the magnetic seat, which attracts the lifting seat and the rack to move down, causing the gear to drive the movable baffle to rotate until it overlaps with the fixed baffle to reduce flow resistance. When the valve disc moves up to close the valve, the control rod moves up, and the limit spring resets the movable baffle to a labyrinth state where it is misaligned with the fixed baffle.

[0006] The bottom surface of the valve disc is fitted with a self-locking spring via a pin, and the self-locking spring is mounted on a guide seat at the bottom of the valve seat. When the top of the valve stem is not under pressure, the valve disc moves upward under the elastic force of the self-locking spring and closes the bottom passage of the valve pipe.

[0007] The valve seat has a limit seat installed on its top surface, and a sealing seat is fixedly installed on the top surface of the limit seat. The valve stem passes through the limit seat and the sealing seat in sequence, and a V-shaped sealing packing is provided in the sealing seat.

[0008] The valve seat has an inlet pipe and an outlet pipe on each side, with the inlet pipe directly connected to the inner cavity of the valve seat. The outlet on the side of the valve pipe has a threaded port, and the outlet pipe is connected to the valve pipe by a threaded sealing connection.

[0009] The labyrinth pressure regulating structure also includes two positioning seats symmetrically installed on the inner wall of the transverse pipe of the valve pipe. A ring seat is fixedly installed on the positioning seat by screws, and an installation rod is vertically welded and fixed on the ring seat, with the installation rod facing the direction of the outlet pipe.

[0010] The fixed baffle is cross-shaped, the movable baffle is cross-shaped, and the arc-shaped guide groove is welded and fixed on both sides of the ring seat. The movable bracket is limited and movablely installed in the arc-shaped guide groove. Limiting springs are connected to both the upper and lower sides of the movable bracket. A movable baffle is installed between the two movable brackets. Under the action of the limiting spring, the movable bracket is kept in the middle position of the arc-shaped guide groove, so that the movable baffle and the fixed baffle are in a front-to-back misaligned state.

[0011] A side seat is installed in the vertical tangential direction of the transverse channel of the valve pipe. The lifting seat is slidably installed in the side seat and can move in the tangential direction of the valve pipe. The rack is welded and fixed to the lifting seat and meshes with the gear. A guide frame is installed on the outer side wall of the side seat. The magnetic seat is slidably installed in the guide frame. The magnetic seat and the lifting seat attract each other through magnetic force.

[0012] The control rod is L-shaped, with its bottom end fixed to the top surface of the valve disc by screws, and its top end located above the magnetic seat. When the valve disc moves down, the control rod contacts the magnetic seat and continues to press down on the magnetic seat. When the valve disc moves up and closes on the valve tube, the control rod separates from the magnetic seat by a certain distance.

[0013] When the valve disc moves downward to open the valve, the control rod presses down on the magnetic seat, causing the magnetic seat to move downward along the guide frame. The magnetic force of the magnetic seat overcomes the resistance of the limit spring and attracts the lifting seat and rack to move downward, driving the gear to rotate the movable baffle to the unobstructed state where it coincides with the fixed baffle. When the valve disc moves upward to close the valve, the control rod moves upward, and the limit spring causes the movable bracket to return to the middle position of the arc-shaped guide groove, and the movable baffle and the fixed baffle return to the misaligned state.

[0014] The regulating plug is welded and fixed to the center of the top surface of the convex-shaped valve disc. The valve disc has a hollow structure, and the annular rubber ring is set at the protruding position in the middle of the valve disc as a side wall. When the valve disc moves upward and the rubber ring is fully inserted into the valve tube, the rubber ring fits against the inner wall of the valve tube to achieve a seal.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By cooperating with the first diaphragm on the top protrusion in the cavity inside the valve disc, the first diaphragm deforms and squeezes the compressed fluid when the upstream high-pressure medium acts, thereby promoting the radial outward deformation and expansion of the rubber ring from the inside, realizing radial self-tightening sealing under high pressure differential conditions; by cooperating with the side pipes, second diaphragm, slide seat and pressure rod installed vertically on both sides of the valve pipe and the conical ring and annular sealing ring on the inner wall of the valve pipe, the second diaphragm deforms under the medium pressure, pushing the pressure rod down to press the conical ring, causing the sealing ring to deform axially and stick tightly to the adjusting plug, realizing axial self-tightening sealing, thereby forming a double self-tightening seal in the radial and axial directions of the valve stem, effectively preventing material leakage under high pressure differential conditions.

[0016] 2. The valve disc is automatically moved upward to close the bottom passage of the valve tube when the valve stem tip is not under pressure, thanks to the self-locking spring installed on the bottom surface of the valve disc and the guide seat. This achieves the valve's safety self-locking function. The valve stem is guided by the limit seat set on the top surface of the valve seat, ensuring the movement accuracy of the valve stem and valve disc. At the same time, the V-shaped sealing packing in the sealing seat further prevents material leakage from the valve stem.

[0017] 3. Through the coordination of the fixed baffle, movable baffle, arc-shaped guide groove, movable support, and limit spring in the assembled labyrinth pressure regulating structure set in the valve pipe, the movable baffle and the fixed baffle are kept in a staggered state to form a labyrinth channel when the valve is initially opened. This decelerates and reduces pressure on the material, effectively preventing sudden high pressure differential impacts from damaging downstream equipment. Through the linkage design of gears, racks, lifting seats, magnetic seats, and control rods, when the valve is fully opened, the magnetic force of the magnetic seat overcomes the resistance of the limit spring, causing the movable baffle to rotate to a smooth state overlapping with the fixed baffle. This ensures the normal and smooth flow of material after the valve is opened, realizing the function of automatically adjusting the working state of the labyrinth structure according to the valve opening degree. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the regulating valve of the present invention.

[0019] Figure 2 This is a schematic diagram of the valve seat in a semi-sectional state according to the present invention.

[0020] Figure 3 This is a schematic diagram of the internal structure of the valve seat of the present invention.

[0021] Figure 4 This is a schematic diagram of the valve stem and valve disc structure of the present invention.

[0022] Figure 5 This is a schematic diagram of the internal structure of the valve disc of the present invention.

[0023] Figure 6 This is a schematic diagram of the valve pipe structure of the present invention.

[0024] Figure 7 This is a first schematic diagram of the internal structure of the valve tube of the present invention.

[0025] Figure 8 This is a second schematic diagram of the internal structure of the valve tube of the present invention.

[0026] Figure 9 This is a first schematic diagram of the labyrinth voltage regulating structure of the present invention.

[0027] Figure 10 This is a second schematic diagram of the labyrinth voltage regulating structure of the present invention.

[0028] In the diagram: 1. Valve seat; 2. Valve pipe; 3. Valve stem; 4. Adjusting plug; 5. Valve disc; 6. Rubber ring; 7. Inlet pipe; 8. Threaded port; 9. Outlet pipe; 10. Self-locking spring; 11. Guide seat; 12. Limit seat; 13. Sealing seat; 14. Cavity; 15. Protrusion seat; 16. First diaphragm; 17. Side pipe; 18. Second diaphragm; 19. Slide seat; 20. Pressure rod; 21. Sealing ring; 22. Conical ring; 23. Positioning seat; 24. Ring seat; 25. Mounting rod; 26. Fixed baffle; 27. Arc-shaped guide groove; 28. Movable bracket; 29. ​​Limit spring; 30. Movable baffle; 31. Gear; 32. Side seat; 33. Lifting seat; 34. Rack; 35. Guide frame; 36. Magnetic seat; 37. Control rod. Detailed Implementation

[0029] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. It should be understood that the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1 to 10 The present invention provides a technical solution: a double self-tightening valve seat 1 sealing structure under high pressure differential conditions. This sealing structure is used in the valve seat 1 of a pneumatic high pressure regulating valve and can perform double self-tightening sealing in the radial and axial directions of the valve stem 3, effectively preventing material leakage under high pressure differential conditions.

[0031] like Figure 1 , Figure 2As shown, the valve seat 1 adopts a square structure. A T-shaped three-way valve pipe 2 is provided in the middle of the valve seat 1. The valve pipe 2 is open from top to bottom and has an outlet on the side. A vertical valve stem 3 is inserted into the valve pipe 2. The top of the valve stem 3 is connected to the control mechanism of the regulating valve, and a conical adjusting plug 4 is fixedly installed at the bottom of the valve stem 3. The degree to which the adjusting plug 4 enters the valve pipe 2 is used to control the valve flow rate.

[0032] like Figures 3-5 As shown, the adjusting plug 4 is welded and fixed to the center of the top surface of the convex-shaped valve disc 5. The valve disc 5 adopts a hollow structure with a cavity 14 inside. At the protruding position in the middle of the valve disc 5, an annular rubber ring 6 is provided as a side wall to form a sealing structure. When the valve disc 5 moves upward and the rubber ring 6 is completely inserted into the valve tube 2, the rubber ring 6 can fit against the inner wall of the valve tube 2 and play a complete sealing role.

[0033] like Figures 3-6 As shown, an inlet pipe 7 and an outlet pipe 9 are respectively provided on both sides of the valve seat 1. The inlet pipe 7 is directly connected to the inner cavity of the valve seat 1. A threaded port 8 is provided on the side outlet of the valve pipe 2. The outlet pipe 9 is connected to the valve pipe 2 by a threaded sealing connection. When the valve is open, the valve disc 5 and the rubber ring 6 do not enter the valve pipe 2. The material enters the inner cavity of the valve seat 1 through the inlet pipe 7, then enters the outlet pipe 9 through the valve pipe 2, and finally enters the downstream.

[0034] like Figure 5 As shown, a self-locking spring 10 is installed on the bottom surface of the valve disc 5 by means of a pin. The self-locking spring 10 is installed on the guide seat 11 at the bottom of the valve seat 1. When the top of the valve stem 3 is not pressed, the valve disc 5 is moved upward by the elastic force of the self-locking spring 10, so that the valve disc 5 closes the bottom channel of the valve pipe 2 and completes the safe self-locking operation of the valve.

[0035] like Figures 1-3 As shown, a limiting seat 12 is installed on the top surface of the valve seat 1, and a sealing seat 13 is fixedly installed on the top surface of the limiting seat 12. The valve stem 3 passes through the limiting seat 12 and the sealing seat 13 in sequence. The limiting seat 12 guides the valve stem 3 to ensure the movement accuracy of the valve stem 3 and the valve disc 5. The sealing seat 13 is provided with V-shaped sealing packing to prevent material leakage from the valve stem 3.

[0036] like Figure 5As shown, the valve disc 5 has a cavity 14 filled with compressed fluid. Four protrusions 15 are annularly arranged on the top surface of the valve disc 5, integrally formed with the valve disc 5. The compressed fluid can enter the protrusions 15. A first diaphragm 16 capable of elastic deformation is installed on the top of the protrusions 15. When the valve disc 5 essentially seals the valve pipe 2, the high pressure of the upstream material acts on the first diaphragm 16, causing it to deform and compress the compressed fluid. This pressure promotes the radial outward deformation of the rubber ring 6 from the inside, further improving the sealing performance and preventing material leakage.

[0037] Furthermore, such as Figure 7 As shown, side pipes 17 are vertically installed on both sides of the vertical pipe of valve pipe 2. A second diaphragm 18 capable of elastic deformation is provided on the outer end face of the side pipe 17, and a slide seat 19 is slidably installed inside the side pipe 17. A horizontal pressure rod 20 is welded and fixed on the slide seat 19. A deformable annular sealing ring 21 is installed on the inner wall of valve pipe 2. A conical ring 22 is provided on the top of the sealing ring 21. When the second diaphragm 18 is deformed by pressure, it can push the slide seat 19 inward. The pressure rod 20 can generate downward pressure on the conical ring 22, promoting the axial deformation of the sealing ring 21, which is tightly attached to the adjusting plug 4 entering the valve pipe 2, further performing self-tightening sealing to prevent material leakage.

[0038] like Figures 8-10 As shown, the valve tube 2 of the present invention is also provided with an assembled labyrinth pressure regulating structure, which makes the valve more adaptable to high pressure differential conditions. When the valve disc 5 just leaves the valve tube 2 and the valve just opens, the labyrinth regulating structure can effectively decelerate the material and prevent the sudden high pressure from affecting the downstream equipment.

[0039] like Figure 8 , Figure 9 As shown, two positioning seats 23 are symmetrically installed on the inner wall of the transverse pipe of valve pipe 2. A ring seat 24 is fixedly installed on the positioning seat 23 with screws. An installation rod 25 is vertically welded and fixed on the ring seat 24. The installation rod 25 is set towards the outlet pipe 9. The ring seat 24 can be sent into the middle of valve pipe 2 for installation and fixation by using the installation rod 25.

[0040] like Figures 8-10As shown, a cross-shaped fixed baffle 26 is provided in the middle of the ring seat 24, which can block and reduce the pressure of the material. Two arc-shaped guide grooves 27 are also welded and fixed on both sides of the ring seat 24. A movable bracket 28 is installed in the arc-shaped guide groove 27 for limiting movement. The movable bracket 28 can move along the direction of the arc-shaped guide groove 27. The upper and lower sides of the movable bracket 28 are connected to limit springs 29, which use the elastic force to keep the movable bracket 28 in the middle position of the arc-shaped guide groove 27. A cross-shaped movable baffle 30 is installed between the two movable brackets 28. When the movable bracket 28 is in the middle, the movable bracket 28 and the fixed baffle 26 are in a misaligned state. The two are in a front-to-back state in the valve pipe 2, forming a labyrinth structure. It can play a strong deceleration and pressure reduction role when the material initially flows, preventing the downstream equipment from being damaged by excessive pressure difference when the valve is opened.

[0041] like Figure 10 As shown, a gear 31 is installed at the center of the movable baffle 30. When the gear 31 rotates, it can drive the movable baffle 30 to rotate to overlap with the fixed baffle 26, reducing the need for material flow to change direction, so as to ensure that the material can flow normally after the valve is opened.

[0042] like Figures 8-10 As shown, a side seat 32 is installed in the vertical tangential direction of the transverse channel of valve pipe 2. A lifting seat 33 is slidably installed in the side seat 32. The lifting seat 33 can move in the tangential direction of valve pipe 2. A rack 34 is welded and fixed on the lifting seat 33. After the ring seat 24 is inserted, the rack 34 can be kept in a meshing state with the gear 31. The lifting seat 33 is made of ferromagnetic material and can be moved and controlled from the outside by using a magnetic seat 36. A guide frame 35 is installed on the outer side wall of the side seat 32. A magnetic seat 36 is slidably installed in the guide frame 35. The magnetic seat 36 and the lifting seat 33 attract each other and are in a state of mutual restriction and control. An L-shaped control rod 37 is fixedly installed on the top surface of the valve disc 5 by screws. The control rod 37 can move up and down with the valve disc 5. The top of the control rod 37 is above the magnetic seat 36. When the control rod 37 moves down, it can drive the magnetic seat 36 to move down along the guide frame 35. When the valve disc 5 moves up and closes on the valve tube 2, the control rod 37 is above the magnetic seat 36 and is separated from it by a certain distance.

[0043] like Figures 1-10As shown, when valve disc 5 moves down, causing the valve to enter the open state, control rod 37 moves down to contact magnetic base 36 and continues to move down, pressing magnetic base 36 down. Therefore, when the valve is initially opened, movable baffle 30 and fixed baffle 26 remain in a state of offset pressure reduction. When the valve is fully opened, the magnetic force of magnetic base 36 can overcome the resistance of limit spring 29, driving control rod 37 and rack 34 to move down, causing gear 31 and movable baffle 30 to rotate. Movable baffle 30 and fixed baffle 26 overlap, allowing materials to flow more smoothly.

[0044] When the fixed baffle 26 and the movable baffle 30 are deformed, the labyrinth pressure regulating structure can be replaced.

[0045] In use, the present invention works as follows: First, with the valve closed, the valve disc 5 moves upward under the elastic force of the self-locking spring 10, sealing the bottom channel of the valve pipe 2. The adjusting plug 4 at the top of the valve disc 5 enters the valve pipe 2, and at the same time, the annular rubber ring 6 in the middle of the valve disc 5 adheres to the inner wall of the valve pipe 2 to achieve a preliminary seal. After the upstream high-pressure medium enters the inner cavity of the valve seat 1, the medium pressure acts on the first diaphragm 16 on the annular protrusion 15 on the top surface of the valve disc 5, causing the first diaphragm 16 to undergo elastic deformation and compress the compressed fluid in the cavity 14 of the valve disc 5. The pressure generated by the compressed fluid causes the rubber ring 6 to expand and deform further outward in the radial direction from the inside, thereby enhancing the radial sealing performance. At the same time, the second diaphragm 18 at the outer end of the side pipes 17 vertically installed on both sides of the valve pipe 2 also undergoes elastic deformation under the action of the medium pressure, pushing... The sliding seat 19 inside the moving side tube 17 and the horizontal pressure rod 20 welded thereon move inward. The pressure rod 20 exerts downward pressure on the conical ring 22 on the inner wall of the valve tube 2, causing the annular sealing ring 21 to deform axially and press tightly against the adjusting plug 4 entering the valve tube 2, thereby forming an axial self-tightening seal. When the valve stem 3 moves downward in a controlled manner, causing the valve disc 5 to open downward, the control rod 37 moves downward with the valve disc 5 and contacts the magnetic seat 36 and continues to press down, causing the magnetic seat 36 to move downward along the guide frame 35. At this time, the magnetic force of the magnetic seat 36 overcomes the resistance of the limiting spring 29 and drives the rack 34 to move downward by attracting the ferromagnetic lifting seat 33. The rack 34 drives the gear 31 to rotate, causing the movable baffle 30 to rotate from the labyrinthine decompression state that is misaligned with the fixed baffle 26 to the unobstructed state that overlaps with the fixed baffle 26.

[0046] Therefore, during the initial opening stage of the valve, the movable baffle 30 and the fixed baffle 26 remain misaligned. When the medium flows through the labyrinthine channel formed by the cross-shaped fixed baffle 26 and the movable baffle 30, it repeatedly turns and decelerates, thereby effectively reducing the impact of the high pressure differential medium on downstream equipment. When the valve is fully opened, the movable baffle 30 and the fixed baffle 26 overlap, reducing the resistance to medium flow and ensuring normal flow. During the valve closing process, the control rod 37 moves upward with the valve disc 5, the magnetic seat 36 loses its downward pressure and resets, and the limit spring 29 causes the movable bracket 28 to return to the middle position of the arc-shaped guide groove 27, and the movable baffle 30 and the fixed baffle 26 return to the misaligned state.

[0047] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances. Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double self-tightening valve seat sealing structure under high pressure differential conditions, comprising a valve seat, a valve pipe, a valve stem, an adjusting plug, and a valve disc, characterized in that: The valve disc has a cavity for loading compressed fluid, and protrusions with a first diaphragm are distributed in a ring on the top surface of the valve disc. A rubber ring is provided in the middle of the valve disc. The valve tube has side tubes with second diaphragms installed vertically on both sides. A pressure rod is fixed in the slide of the side tube. The valve tube has a sealing ring with a conical ring on the inner wall. The valve pipe has a labyrinth pressure regulating structure inside the transverse pipe. The structure includes a fixed baffle, a movable baffle installed in the arc-shaped guide groove by a limit spring, and a gear that drives the movable baffle to rotate. The valve disc drives the magnetic seat and the ferromagnetic lifting seat through the control rod. The lifting seat is equipped with a rack that meshes with the gear. When the upstream medium pressure acts on the first diaphragm, the first diaphragm deforms and squeezes the compressed fluid, causing the rubber ring to expand radially. At the same time, the second diaphragm deforms and pushes the pressure rod down to press the conical ring, causing the sealing ring to axially press tightly against the adjusting plug, forming a double self-tightening seal in both the radial and axial directions. When the valve disc moves down to open the valve, the control rod presses down on the magnetic seat, which attracts the lifting seat and rack to move down, causing the gear to drive the movable baffle to rotate until it overlaps with the fixed baffle to reduce flow resistance. When the valve disc moves up to close the valve, the control rod moves up, and the limit spring resets the movable baffle to a labyrinth state where it is misaligned with the fixed baffle.

2. The double self-tightening valve seat sealing structure under high pressure differential conditions according to claim 1, characterized in that: A self-locking spring is mounted on the bottom surface of the valve disc via a pin, and the self-locking spring is mounted on a guide seat at the bottom of the valve seat. When the top of the valve stem is not under pressure, the valve disc moves upward under the elastic force of the self-locking spring and closes the bottom passage of the valve tube.

3. The double self-tightening valve seat sealing structure under high pressure differential conditions according to claim 1, characterized in that: A limit seat is installed on the top surface of the valve seat, and a sealing seat is fixedly installed on the top surface of the limit seat; The valve stem passes through the limit seat and the sealing seat in sequence, and the sealing seat is equipped with V-shaped sealing packing.

4. The double self-tightening valve seat sealing structure under high pressure differential conditions according to claim 1, characterized in that: The valve seat is provided with an inlet pipe and an outlet pipe on both sides, and the inlet pipe is directly connected to the inner cavity of the valve seat. The valve tube has a threaded port on its side outlet, and the outlet tube is connected to the valve tube by a threaded sealing connection.

5. The double self-tightening valve seat sealing structure under high pressure differential conditions according to claim 1, characterized in that: The labyrinth pressure regulating structure also includes two positioning seats symmetrically installed on the inner wall of the transverse pipe of the valve pipe. A ring seat is fixedly installed on the positioning seat by screws, and an installation rod is vertically welded and fixed on the ring seat, with the installation rod facing the direction of the outlet pipe.

6. The double self-tightening valve seat sealing structure under high pressure differential conditions according to claim 5, characterized in that: The fixed baffle is cross-shaped, the movable baffle is cross-shaped, the arc-shaped guide groove is welded and fixed on both sides of the ring seat, and the movable bracket is limited and movablely installed in the arc-shaped guide groove; Limiting springs are connected to both the upper and lower sides of the movable bracket. A movable baffle is installed between the two movable brackets. Under the action of the limiting springs, the movable bracket is kept in the middle position of the arc-shaped guide groove, so that the movable baffle and the fixed baffle are in a staggered state.

7. The double self-tightening valve seat sealing structure under high pressure differential conditions according to claim 6, characterized in that: A side seat is installed in the vertical tangential direction of the transverse channel of the valve pipe. The lifting seat is slidably installed in the side seat and can move in the tangential direction of the valve pipe. The rack is welded and fixed to the lifting seat and meshes with the gear. A guide frame is installed on the outer side wall of the side seat. The magnetic seat is slidably installed in the guide frame. The magnetic seat and the lifting seat attract each other through magnetic force.

8. The double self-tightening valve seat sealing structure under high pressure differential conditions according to claim 7, characterized in that: The control lever is L-shaped, with its bottom end fixed to the top surface of the valve disc by screws, and its top end located above the magnetic base. When the valve disc moves downward, the control rod contacts the magnetic seat and continues to press down on the magnetic seat. When the valve disc moves upward and closes on the valve tube, the control rod disengages from the magnetic seat by a certain distance.

9. The double self-tightening valve seat sealing structure under high pressure differential conditions according to claim 8, characterized in that: When the valve disc moves down to open the valve, the control lever presses down on the magnetic seat, causing the magnetic seat to move down along the guide frame. The magnetic force of the magnetic seat overcomes the resistance of the limit spring and moves down by attracting the lifting seat and rack. The drive gear drives the movable baffle to rotate to the unobstructed state where it coincides with the fixed baffle. When the valve disc moves upward to close the valve, the control rod moves upward, and the limit spring causes the movable bracket to return to the middle position of the arc-shaped guide groove, and the movable baffle and the fixed baffle return to their misaligned state.

10. The double self-tightening valve seat sealing structure under high pressure differential conditions according to claim 1, characterized in that: The adjusting plug is welded and fixed to the center of the top surface of the convex-shaped valve disc. The valve disc has a hollow structure, and an annular rubber ring is set at the protruding position in the middle of the valve disc as a side wall. When the valve disc moves upward and the rubber ring is fully inserted into the valve tube, the rubber ring adheres to the inner wall of the valve tube to achieve a seal.

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