Double-gate-plate gate valve

Abstract

The invention relates to the technical field of gate valves, and discloses a double-disc gate valve which comprises a water inlet valve body, a valve seat valve body and a water outlet valve body, the water inlet valve body is arranged at one end of the valve seat valve body, the water outlet valve body is arranged at the other end of the valve seat valve body, a valve cover is arranged at the top end of the valve seat valve body, a stuffing box is arranged at the top end of the valve cover, and a door-shaped support is arranged on the outer side of the stuffing box. A pressing nest disc and a rubber seat are tightly pressed on the outer side of the first gate plate and the outer side of the second gate plate, pressure is evenly applied to the edges of the first gate plate and the second gate plate, the first gate plate and the second gate plate are tightly pressed, the second gate plate and the second gate plate are tightly pressed, and the first gate plate and the second gate plate are tightly pressed. The first flashboard and the second flashboard can seal one end of the water inlet valve body or one end of the water outlet valve body, the pressing force can be adjusted through rotation of the nut, and the good sealing effect can still be kept after the flashboards generate small-amplitude abrasion.

Description

Technical Field

[0001] The invention relates to the technical field of gate valves, in particular to a double-disc gate valve. Background Art

[0002] The double-disc gate valve is a valve that uses two parallel gates as closing parts. The opening or closing of the valve is controlled by the lifting action of the gates, so as to control the flow of fluid in the pipeline. The double gates can reduce the possibility of leakage to a certain extent. If one gate has a problem, the other can still provide a certain sealing effect. The double gate can balance the pressure on both sides, which helps to reduce the driving force required by the actuator, especially in the case of high pressure difference. The double-disc gate valve is mainly used in the petroleum, chemical, pharmaceutical, electric power and other industries. It is used as an opening and closing device in the pipeline system of steam, water, oil and other media. It is widely used in places where fluid channels need to be cut off or opened, especially in places where frequent opening and closing are not required and full opening or full closing conditions are required.

[0003] The existing Chinese patent (CN202228705U) discloses a double-disc flat gate valve, including a valve stem, a valve body and a shut-off mechanism installed in the valve body, the shut-off mechanism includes at least two flat gates and a spreading mechanism arranged between the two flat gates, the spreading mechanism includes a wedge block and at least two expansion blocks, the wedge block is connected to the valve stem and is provided with a wedge surface that deviates from the valve stem axis from bottom to top and tilts outward, the two expansion blocks are respectively tightly arranged on the two flat gates and are both provided with an inclined surface that is adapted to the wedge surface and deviates from the valve stem axis from top to bottom and tilts inward, the wedge block is provided with a wedge block hole, the wedge block hole is provided with a shaft sleeve, the diameter of the wedge hole is larger than the diameter of the shaft sleeve, the shaft sleeve is fixedly connected to the flat gate and the expansion block, the shaft sleeve is provided with a bolt, the bolt is fixedly connected to the flat gate and the shaft sleeve, the shaft sleeve and the wedge block are connected with a spring, and the spring connects the shaft sleeve, the wedge block and the expansion block as a whole.

[0004] In the above technical solutions and the prior art, the connection parts between the two gate plates and the opening mechanism are concentrated in the middle of the gate plates. During the use of the gate plates, the contact parts between the edges of the gate plates and the valve seats will be affected by the liquid pressure and the opening and closing wear. In the prior art and the above technology, the edge of the gate plates is not supported sufficiently, which can easily cause the edge of the gate plates to wear and deform, resulting in water leakage, and affecting the sealing life of the gate plates. Summary of the invention

[0005] The object of the present invention is to provide a double-disc gate valve to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a double-disc gate valve, comprising: an inlet valve body, a valve seat valve body and an outlet valve body, wherein the valve seat valve body is provided with an inlet valve body at one end, and an outlet valve body at the other end, a valve cover is provided at the top of the valve seat valve body, a stuffing box is provided at the top of the valve cover, a door-type bracket is provided on the outside of the stuffing box, a threaded valve stem is provided in the center of the door-type bracket, a swivel seat is provided at the bottom end of the threaded valve stem, a central support rod is fixed to the bottom end of the swivel seat, a first gate plate is provided at one end of the central support rod, and a second gate plate is provided at the other end, a rubber seat is provided on one side of the first gate plate and the second gate plate, a clamping disc is provided on the outside of the rubber seat, a gasket is provided on the outside of the clamping disc, and a nut is provided on the outside of the gasket.

[0007] As a further explanation of the present invention, the outer wall of the central support rod is provided with an external thread matching with the nut, and the center of the gasket, the pressing dimple and the rubber seat are all provided with a through hole for the central support rod to pass through.

[0008] As a further explanation of the present invention, the clamping nest is in the shape of a disk with a bulge in the middle and flanges on all sides. The middle part of the rubber seat is cylindrical. A rubber flange is provided at one end of the rubber seat. The outer wall contour of the rubber flange coincides with the outer wall contour of the first gate plate. The outer wall contour of the flange of the clamping nest coincides with the outer wall contour of the first gate plate.

[0009] As a further explanation of the present invention, U-shaped tubes are provided on both sides of the inner wall of the valve seat valve body, the top of the U-shaped tube is an open end, and the bottom end is an arc-shaped closed end. A connecting tube is provided between the open ends, and the closed end is located below the first gate plate or the second gate plate.

[0010] As a further explanation of the present invention, a drain valve is provided in the center of the bottom of the valve seat valve body, and connecting valves are provided on both sides of the bottom of the valve seat valve body. The top of the connecting valve is connected to the U-shaped pipe. The connecting valve is used to connect a high-pressure water pipe, and a water outlet hole is provided at the bottom of the connecting pipe.

[0011] As a further explanation of the present invention, a guide column is provided inside the water outlet, a sealing plate is provided at the bottom end of the guide column, a connecting rod is provided at the bottom end of the sealing plate, a bottom plate is provided at the bottom end of the connecting rod, and a spring is provided between the bottom plate and the outer wall of the connecting pipe.

[0012] As a further description of the present invention, the diameter of the water outlet hole is larger than the outer diameter of the guide column, the diameter of the sealing plate is larger than the diameter of the water outlet hole, and a plurality of water outlet holes are provided.

[0013] As a further description of the present invention, a turning handle is provided at the top end of the threaded valve stem, and a packing for sealing between the threaded valve stem and the stuffing box is provided inside the stuffing box.

[0014] As a further explanation of the present invention, a stepped hole is provided at the top of the swivel seat, and the stepped hole is in a shape with a small top diameter and a large top diameter, and the swivel seat is rotatably connected to the threaded valve stem.

[0015] As a further description of the present invention, the valve seat valve body is in the shape of a U-shaped hollow shell, and the valve seat valve body is connected to the valve cover by bolts.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention realizes that when the double-disc gate valve is used, the pressing dimple and the rubber seat are tightly pressed against the outer sides of the first gate plate and the second gate plate by rotating the nut, and pressure is evenly applied to the edges of the first gate plate and the second gate plate, so that the first gate plate and the second gate plate can seal one end of the water inlet valve body or the water outlet valve body. The pressing force can be adjusted by rotating the nut, and a good sealing effect can be maintained even after the gate plate is slightly worn. The elastic force of the pressing dimple and the rubber seat can also ensure that the nut is loosened, thereby ensuring the pressing effect. In addition, during the use of the double-disc gate valve, when dirt accumulates inside the valve seat and valve body, it can be discharged through the drain valve. It can also be connected to a high-pressure water pipe through the connecting valve, and high-pressure water can be filled into the U-tube and the connecting pipe. The water is discharged through the water outlet on the connecting pipe to flush the inside of the valve seat and valve body, ensuring the cleanliness of the inside of the valve seat and valve body, which can reduce the wear of the gate and improve the stability of the gate seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 An exploded view of a double-disc gate valve of the present invention; Figure 2 A three-dimensional diagram of a double-disc gate valve of the present invention; Figure 3 This is a front view of a double-disc gate valve of the present invention; Figure 4 It is a left view of a double-disc gate valve of the present invention; Figure 5 A top view of a double-disc gate valve of the present invention; Figure 6 This is a main cross-sectional view of a double-disc gate valve of the present invention; Figure 7 for Figure 6 The enlarged structural diagram at A in the middle; Figure 8 It is a left sectional view of a double-disc gate valve of the present invention; Fig. 9 An exploded view of a compression socket connection assembly of a double-disc gate valve of the present invention; Fig.10 for Figure 8Enlarged structural diagram at B in the middle.

[0018] In the figure: 1. Inlet valve body; 2. Valve seat body; 3. Outlet valve body; 4. Valve cover; 5. Stuffing box; 6. Gate bracket; 7. Threaded valve stem; 8. Swivel seat; 9. Central support rod; 10. First gate plate; 11. Second gate plate; 12. Rubber seat; 13. Pressing disc; 14. Gasket; 15. Nut; 16. U-shaped pipe; 17. Connecting pipe; 18. Drain valve; 19. Connecting valve; 20. Spring; 21. Connecting rod; 22. Bottom plate; 23. Sealing plate; 24. Guide column. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Example 1: Please refer to Figure 1-Figure 9 The present invention provides a technical solution: a double-disc gate valve, comprising: an inlet valve body 1, a valve seat valve body 2 and an outlet valve body 3. The inlet valve body 1 is provided at one end of the valve seat valve body 2. The inlet valve body 1 is the part where water flows into the valve and is usually connected to an upstream pipeline or water source. The outlet valve body 3 is provided at the other end. The outlet valve body 3 is the part where water flows out of the valve and is usually connected to a downstream pipeline or system. A valve cover 4 is provided at the top of the valve seat valve body 2. The valve cover 4 is located at the top of the valve seat valve body to protect the internal components from the external environment and provide an installation position for other components such as a stuffing box. A stuffing box 5 is provided at the top of the valve cover 4 to accommodate fillers such as graphite or PTFE to prevent fluid from leaking from the gap between the threaded valve stem 7 and the valve cover 4. A gate-type bracket 6 is provided on the outside of the stuffing box 5. The gate-type bracket 6 is used to support the threaded valve stem to ensure that it can withstand pressure from above while moving vertically. A threaded valve stem 7 is provided in the center of the gate-type bracket 6 to lift or lower the gate plate by rotation to control the opening and closing of the valve. A swivel seat 8 is provided at the bottom end of the threaded valve stem 7 as a transition piece between the threaded valve stem and the central support rod to ensure smooth transmission. A central support rod 9 is fixed to the bottom end of the swivel seat 8 to support and guide the gate plates to ensure that they remain parallel during lifting and lowering. A first gate plate 10 is provided at one end of the central support rod 9 and a second gate plate 11 is provided at the other end. The first gate plate 10 and the second gate plate 11: directly contact the fluid and control the flow of the fluid by moving up and down.

[0021] A rubber seat 12 is provided on one side of the first gate plate 10 and the second gate plate 11, a pressing dimple 13 is provided on the outside of the rubber seat 12, a gasket 14 is provided on the outside of the pressing dimple 13, and a nut 15 is provided on the outside of the gasket 14. When the double-disc gate valve is used, the pressing dimple 13 and the rubber seat 12 are tightly pressed on the outside of the first gate plate 10 and the second gate plate 11 by rotating the nut 15, and pressure is evenly applied to the edges of the first gate plate 10 and the second gate plate 11, so that the first gate plate 10 and the second gate plate 11 can seal one end of the water inlet valve body 1 or the water outlet valve body 3, and the pressing force can be adjusted by rotating the nut 15, so that a good sealing effect can be maintained even after the gate plate is slightly worn, and the elastic force of the pressing dimple 13 and the rubber seat 12 can also ensure that the nut 15 is loosened to ensure the pressing effect.

[0022] The outer wall of the central support rod 9 is provided with an external thread that matches the nut 15, and the gasket 14, the pressing dimple 13 and the rubber seat 12 are all provided with a through hole for the central support rod 9 to pass through. The external thread on the central support rod 9 matches the nut 15, allowing the position of the nut to be adjusted by rotating the nut, thereby adjusting the position of the pressing dimple 13 and the rubber seat 12. The through hole in the center of the gasket 14, the pressing dimple 13 and the rubber seat 12 is to allow the central support rod 9 to pass through these components. Such a design ensures that all these components can move in a straight line along the central support rod without offset or tilt, thereby ensuring that the gate can be evenly stressed when under pressure.

[0023] The pressing dimple 13 is in the shape of a disk with a raised center and flanges around it. The middle of the rubber seat 12 is cylindrical. A rubber flange is provided at one end of the rubber seat 12. The outer wall contour of the rubber flange matches the outer wall contour of the first gate plate 10. The outer wall contour of the flange of the pressing dimple 13 matches the outer wall contour of the first gate plate 10. Since the flange parts of the pressing dimple 13 and the rubber seat 12 match the contour of the first gate plate 10, the pressure can be evenly distributed on the gate plate when the nut 15 is tightened. The elastic characteristics of the rubber seat 12 plus the stable pressure provided by the pressing dimple 13 make it possible to maintain a good sealing effect by adjusting the degree of compression even if the gate plate has a certain amount of wear.

[0024] Example 2: Please refer to Figure 1-Figure 10The present invention provides a technical solution: a double-disc gate valve, comprising: an inlet valve body 1, a valve seat valve body 2 and an outlet valve body 3. The inlet valve body 1 is provided at one end of the valve seat valve body 2. The inlet valve body 1 is the part where water flows into the valve and is usually connected to an upstream pipeline or water source. The outlet valve body 3 is provided at the other end. The outlet valve body 3 is the part where water flows out of the valve and is usually connected to a downstream pipeline or system. A valve cover 4 is provided at the top of the valve seat valve body 2. The valve cover 4 is located at the top of the valve seat valve body to protect the internal components from the external environment and provide an installation position for other components such as a stuffing box. A stuffing box 5 is provided at the top of the valve cover 4 to accommodate fillers such as graphite or PTFE to prevent fluid from leaking from the gap between the threaded valve stem 7 and the valve cover 4. A gate-type bracket 6 is provided on the outside of the stuffing box 5. The gate-type bracket 6 is used to support the threaded valve stem to ensure that it can withstand pressure from above while moving vertically. A threaded valve stem 7 is provided in the center of the gate-type bracket 6 to lift or lower the gate plate by rotation to control the opening and closing of the valve. A swivel seat 8 is provided at the bottom end of the threaded valve stem 7 as a transition piece between the threaded valve stem and the central support rod to ensure smooth transmission. A central support rod 9 is fixed to the bottom end of the swivel seat 8 to support and guide the gate plates to ensure that they remain parallel during lifting and lowering. A first gate plate 10 is provided at one end of the central support rod 9 and a second gate plate 11 is provided at the other end. The first gate plate 10 and the second gate plate 11: directly contact the fluid and control the flow of the fluid by moving up and down.

[0025] A rubber seat 12 is provided on one side of the first gate plate 10 and the second gate plate 11, a pressing dimple 13 is provided on the outside of the rubber seat 12, a gasket 14 is provided on the outside of the pressing dimple 13, and a nut 15 is provided on the outside of the gasket 14. When the double-disc gate valve is used, the pressing dimple 13 and the rubber seat 12 are tightly pressed on the outside of the first gate plate 10 and the second gate plate 11 by rotating the nut 15, and pressure is evenly applied to the edges of the first gate plate 10 and the second gate plate 11, so that the first gate plate 10 and the second gate plate 11 can seal one end of the water inlet valve body 1 or the water outlet valve body 3, and the pressing force can be adjusted by rotating the nut 15, so that a good sealing effect can be maintained even after the gate plate is slightly worn, and the elastic force of the pressing dimple 13 and the rubber seat 12 can also ensure that the nut 15 is loosened to ensure the pressing effect.

[0026] The outer wall of the central support rod 9 is provided with an external thread that matches the nut 15, and the gasket 14, the pressing dimple 13 and the rubber seat 12 are all provided with a through hole for the central support rod 9 to pass through. The external thread on the central support rod 9 matches the nut 15, allowing the position of the nut to be adjusted by rotating the nut, thereby adjusting the position of the pressing dimple 13 and the rubber seat 12. The through hole in the center of the gasket 14, the pressing dimple 13 and the rubber seat 12 is to allow the central support rod 9 to pass through these components. Such a design ensures that all these components can move in a straight line along the central support rod without offset or tilt, thereby ensuring that the gate can be evenly stressed when under pressure.

[0027] The pressing dimple 13 is in the shape of a disk with a raised center and flanges around it. The middle of the rubber seat 12 is cylindrical. A rubber flange is provided at one end of the rubber seat 12. The outer wall contour of the rubber flange matches the outer wall contour of the first gate plate 10. The outer wall contour of the flange of the pressing dimple 13 matches the outer wall contour of the first gate plate 10. Since the flange parts of the pressing dimple 13 and the rubber seat 12 match the contour of the first gate plate 10, the pressure can be evenly distributed on the gate plate when the nut 15 is tightened. The elastic characteristics of the rubber seat 12 plus the stable pressure provided by the pressing dimple 13 make it possible to maintain a good sealing effect by adjusting the degree of compression even if the gate plate has a certain amount of wear.

[0028] In this embodiment, U-shaped tubes 16 are provided on both sides of the inner wall of the valve seat body 2. The top of the U-shaped tube 16 is an open end, and the bottom is an arc-shaped closed end. A connecting tube 17 is provided between the open ends, and the closed end is located below the first gate plate 10 or the second gate plate 11. A drain valve 18 is provided at the center of the bottom of the valve seat body 2, and connecting valves 19 are provided on both sides of the bottom of the valve seat body 2. The top of the connecting valve 19 is connected to the U-shaped tube 16. The connecting valve 19 is used to connect a high-pressure water pipe, and a water outlet is provided at the bottom of the connecting tube 17. When dirt accumulates inside the valve seat body 2, it can be discharged through the drain valve 18, and a high-pressure water pipe can be connected through the connecting valve 19, and high-pressure water flow can be filled into the U-shaped tube 16 and the connecting tube 17, and discharged through the water outlet on the connecting tube 17 to flush the inside of the valve seat body 2, so as to ensure that the inside of the valve seat body 2 is clean, reduce the wear of the gate plate, and improve the stability of the gate plate seal.

[0029] Please also read Fig.10, a guide column 24 is provided inside the water outlet, a sealing plate 23 is provided at the bottom end of the guide column 24, a connecting rod 21 is provided at the bottom end of the sealing plate 23, a bottom plate 22 is provided at the bottom end of the connecting rod 21, and a spring 20 is provided between the bottom plate 22 and the outer wall of the connecting pipe 17. The whole constitutes a one-way valve. The guide column 24 is located inside the water outlet and is used to guide and locate the position of the sealing plate 23. The sealing plate is located at the bottom end of the guide column 24 and is the main component of the one-way valve. When there is no high-pressure water flow, the sealing plate 23 is pressed against the guide column or the water outlet under the action of the spring 20 to prevent the liquid in the valve seat body from flowing back. The connecting rod is located at the bottom end of the sealing plate 23 and is used to connect the sealing plate 23 and the bottom plate 22 to ensure the stability of the overall structure. It transmits the force between the sealing plate and the bottom plate to ensure that the sealing plate 23 can be correctly reset. The bottom plate is located at the bottom end of the connecting rod 21 and provides bottom support for the one-way valve. It and the connecting rod 21 together form the base of the one-way valve, ensuring that the sealing plate 23 can return to the initial position when there is no high-pressure water flow. The spring 20 is located between the bottom plate 22 and the outer wall of the connecting pipe 17 to provide a restoring force. When the high-pressure water flow stops, the spring 20 can push the sealing plate 23 back to the initial position to ensure that the water outlet is sealed.

[0030] The combination of the spring 20 and the sealing plate 23 effectively prevents the liquid in the valve seat and valve body from entering the connecting pipe 17 in a non-flushing state, thereby ensuring the safety of the system. When the high-pressure water flow stops, the spring 20 can automatically reset the sealing plate 23, ensuring the automatic closing function of the one-way valve. The design of the one-way valve allows the user to close or open the valve without additional steps during the flushing operation, thus simplifying the cleaning process. This design not only ensures the one-way flow of liquid during the cleaning process, but also reduces the risk of contamination or damage caused by backflow.

[0031] The diameter of the water outlet hole is larger than the outer diameter of the guide column 24, and the diameter of the sealing plate 23 is larger than the diameter of the water outlet hole. There are multiple water outlet holes. The provision of multiple water outlet holes means that high-pressure water can be sprayed out from different positions to cover a larger area, thereby more thoroughly cleaning the internal space of the valve seat body 2. The diameter of the sealing plate 23 is larger than the diameter of the water outlet hole, ensuring that when there is no high-pressure water flow, the sealing plate 23 can completely cover the water outlet hole to prevent the internal liquid from flowing back. The diameter of the guide column 24 is smaller than the diameter of the water outlet hole, so that the sealing plate 23 can be smoothly opened under the action of the high-pressure water flow, and can be restored to a sealed state by relying on the power of the spring 20 when there is no water flow.

[0032] A turning handle is provided at the top of the threaded valve stem 7, and a packing for sealing between the threaded valve stem 7 and the packing box 5 is provided inside the packing box 5. The design of the turning handle allows the operator to directly rotate the threaded valve stem 7 by hand to control the lifting and lowering of the gate. The setting of the turning handle improves the convenience of operation and makes manual operation more labor-saving and intuitive. The packing inside the packing box 5 is mainly used to form a seal between the threaded valve stem 7 and the packing box 5. The packing is usually made of graphite, polytetrafluoroethylene or other suitable materials, which have good sealing performance and wear resistance.

[0033] A stepped hole is provided at the top of the swivel seat 8, and the stepped hole has a shape with a small diameter at the top and a large diameter at the bottom. The swivel seat 8 is rotatably connected to the threaded valve stem 7. The design of this stepped hole can provide enough space to accommodate the bottom of the threaded valve stem 7, and can ensure the stability of the threaded valve stem when it moves up and down. The swivel seat 8 and the threaded valve stem 7 are rotatably connected, which means that the threaded valve stem 7 can rotate freely in the swivel seat 8, but its axial position is limited by the stepped hole. This connection method ensures that the threaded valve stem 7 will not deviate from the center line when moving up and down, thereby ensuring the vertical movement of the gate.

[0034] The valve seat body 2 is in the shape of a U-shaped hollow shell, and the valve seat body 2 is connected to the valve cover 4 by bolts. The U-shaped design can provide enough space to accommodate the U-shaped tube 16 and other internal components. The U-shaped design may also facilitate the smooth flow of the fluid and reduce the turbulence or dead angle of the fluid inside the valve. Through the bolt connection, the valve cover 4 can be easily removed from the valve seat body 2, which is convenient for inspection and maintenance of internal components, such as replacing the packing or checking whether there is internal wear.

[0035] When the double-disc gate valve is in use, the pressing dimple 13 and the rubber seat 12 are tightly pressed against the outer sides of the first gate plate 10 and the second gate plate 11 by rotating the nut 15, and pressure is evenly applied to the edges of the first gate plate 10 and the second gate plate 11, so that the first gate plate 10 and the second gate plate 11 can seal one end of the water inlet valve body 1 or the water outlet valve body 3. The pressing force can be adjusted by rotating the nut 15, and a good sealing effect can be maintained even after the gate plate is slightly worn. The elastic force of the pressing dimple 13 and the rubber seat 12 can also ensure that the nut 15 is loosened, thereby ensuring the pressing effect. In addition, during the use of the double-disc gate valve, when dirt accumulates inside the valve seat body 2, it can be discharged through the drain valve 18, and a high-pressure water pipe can be connected through the connecting valve 19 to fill the U-tube 16 and the connecting pipe 17 with high-pressure water, and discharge it through the water outlet on the connecting pipe 17 to flush the inside of the valve seat body 2, thereby ensuring the cleanliness of the inside of the valve seat body 2, reducing the wear of the gate plate, and improving the stability of the gate plate seal.

[0036] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A double-disc gate valve, comprising: An inlet valve body (1), a valve seat valve body (2) and a water outlet valve body (3), characterized in that: the valve seat valve body (2) is provided with an inlet valve body (1) at one end and a water outlet valve body (3) at the other end; a valve cover (4) is provided at the top end of the valve seat valve body (2); a stuffing box (5) is provided at the top end of the valve cover (4); a door-shaped bracket (6) is provided on the outside of the stuffing box (5); a threaded valve stem (7) is provided in the center of the door-shaped bracket (6); a swivel seat (8) is provided at the bottom end of the threaded valve stem (7); a central support rod (9) is fixed to the bottom end of the swivel seat (8); a first gate plate (10) is provided at one end of the central support rod (9) and a second gate plate (11) is provided at the other end; a rubber seat (12) is provided on one side of the first gate plate (10) and the second gate plate (11); a pressing disc (13) is provided on the outside of the rubber seat (12); a gasket (14) is provided on the outside of the pressing disc (13); a nut (15) is provided on the outside of the gasket (14).

2. A double-disc gate valve according to claim 1, characterized in that: The outer wall of the central support rod (9) is provided with an external thread that matches the nut (15), and the center of the gasket (14), the pressing socket (13) and the rubber seat (12) are all provided with a through hole for the central support rod (9) to pass through.

3. A double-disc gate valve according to claim 2, characterized in that: The clamping socket (13) is in the shape of a disc with a raised center and flanges on all sides. The middle part of the rubber seat (12) is cylindrical. A rubber flange is provided at one end of the rubber seat (12). The outer wall contour of the rubber flange matches the outer wall contour of the first gate plate (10). The outer wall contour of the flange of the clamping socket (13) matches the outer wall contour of the first gate plate (10).

4. A double-disc gate valve according to claim 1, characterized in that: U-shaped tubes (16) are provided on both sides of the inner wall of the valve seat valve body (2); the top end of the U-shaped tube (16) is an open end, and the bottom end is an arc-shaped closed end; a connecting tube (17) is provided between the open ends; and the closed end is located below the first gate plate (10) or the second gate plate (11).

5. A double-disc gate valve according to claim 4, characterized in that: A sewage valve (18) is provided at the center of the bottom of the valve seat valve body (2), and connecting valves (19) are provided on both sides of the bottom of the valve seat valve body (2). The top of the connecting valve (19) is connected to the U-shaped pipe (16), and the connecting valve (19) is used to connect to a high-pressure water pipe. A water outlet hole is provided at the bottom of the connecting pipe (17).

6. A double-disc gate valve according to claim 5, characterized in that: A guide column (24) is provided inside the water outlet hole, a sealing plate (23) is provided at the bottom end of the guide column (24), a connecting rod (21) is provided at the bottom end of the sealing plate (23), a bottom plate (22) is provided at the bottom end of the connecting rod (21), and a spring (20) is provided between the bottom plate (22) and the outer wall of the connecting pipe (17).

7. A double-disc gate valve according to claim 6, characterized in that: The diameter of the water outlet hole is larger than the outer diameter of the guide column (24), the diameter of the sealing plate (23) is larger than the diameter of the water outlet hole, and a plurality of water outlet holes are provided.

8. A double-disc gate valve according to claim 1, characterized in that: A turning handle is provided at the top end of the threaded valve stem (7), and a packing for sealing between the threaded valve stem (7) and the stuffing box (5) is provided inside the stuffing box (5).

9. A double-disc gate valve according to claim 1, characterized in that: A stepped hole is provided at the top of the rotating seat (8), wherein the stepped hole has a small diameter at the top and a large diameter at the bottom. The rotating seat (8) is rotatably connected to the threaded valve stem (7).

10. A double-disc gate valve according to claim 1, characterized in that: The valve seat valve body (2) is in the shape of a U-shaped hollow shell, and the valve seat valve body (2) and the valve cover (4) are connected via bolts.

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