Wear-resistant anti-leakage gate valve

Abstract

This invention belongs to the field of gate valve technology, specifically a wear-resistant and leak-proof gate valve, comprising a housing, an inlet end on one side of the housing, an outlet end on the other side of the housing, an end cap on the top of the housing, a threaded rod rotatably connected inside the end cap, a turntable fixed at the top of the threaded rod, a sealing plate threadedly connected to the bottom of the threaded rod, and a gate plate fixed at the bottom of the sealing plate. Two symmetrical movable valve seats are arranged on both sides of the housing, with a sealing gasket on the side of the movable valve seat closest to the gate plate, and switching assemblies on both sides of the movable valve seats. By controlling the movable valve seats with the switching assemblies, the two movable valve seats separate outwards before the gate plate rises, and clamp the gate plate inwards after the gate plate descends to its final position. This prevents sliding friction between the gate plate and the sealing gasket during the rising and falling process, reducing wear on the sealing gasket and avoiding valve leakage caused by gasket wear.

Description

Technical Field

[0001] This invention belongs to the field of gate valve technology, specifically a wear-resistant and leak-proof gate valve. Background Technology

[0002] A gate valve is a shut-off valve that opens or closes a flow path by vertically raising or lowering a gate. It is widely used in pipeline systems in industries such as petroleum, chemical, natural gas, water supply, power, and metallurgy. Compared to other types of valves such as ball valves and butterfly valves, gate valves have advantages such as low fluid resistance, unrestricted medium flow direction, and lower torque required for opening and closing. They are particularly suitable for large-diameter pipelines and applications with low flow resistance requirements. The basic working principle involves rotating a handwheel or drive device to rotate the valve stem, converting the rotational motion into linear motion through the threaded joint between the valve stem and the gate. This causes the gate to rise or fall, thus opening or closing the pipeline.

[0003] Common gate valves mainly consist of a valve body, valve cover, valve stem, gate, and two valve seats symmetrically arranged inside the valve body. The valve seats are typically fixedly installed on both sides of the flow channel within the valve body. A sealing gasket is located on the side closest to the gate, often made of materials such as rubber, polytetrafluoroethylene (PTFE), or flexible graphite, to form a sealing pair with the gate surface when the gate is closed. During operation, the valve stem drives the gate to move vertically up and down between the two valve seats. When the valve needs to be closed, the valve stem drives the gate downwards until both sides of the gate are tightly fitted with the sealing gaskets of the two valve seats, relying on the elastic deformation or initial interference of the gaskets to block the flow of the medium. When the valve needs to be opened, the valve stem rotates in the opposite direction, driving the gate upwards. At this time, sliding friction occurs between the gate surface and the sealing gasket until the gate completely detaches from the sealing gasket, allowing the medium to flow through the channel between the gate and the valve seats.

[0004] In the operation of existing gate valves, the gate plate slides and rubs against the sealing gasket with each raising and lowering during use, causing the sealing gasket to wear out quickly. With the increase of use, the surface of the sealing gasket is prone to scratches, wear, or deformation, which makes it impossible for the gate plate to form an effective seal with the sealing gasket after it descends, thus causing leakage.

[0005] Therefore, the present invention provides a wear-resistant and leak-proof gate valve. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The wear-resistant and leak-proof gate valve of the present invention includes an outer shell, an inlet end provided on one side of the outer shell, an outlet end provided on the other side of the outer shell, an end cap installed on the top of the outer shell, a threaded rod rotatably connected inside the end cap, a turntable fixed at the top of the threaded rod, a sealing plate threadedly connected to the bottom of the threaded rod, a gate plate fixed at the bottom of the sealing plate, two symmetrical movable valve seats provided on both sides of the inner shell, a sealing gasket provided on the side of the movable valve seat near the gate plate, and switching assemblies provided on both sides of the movable valve seat for driving the movable valve seat to clamp or move away from the gate plate; Specifically, before the gate is raised, the movable valve seats separate to both sides, and after the gate is lowered, the movable valve seats on both sides clamp onto the gate.

[0008] Preferably, the switch structure includes an electric telescopic rod hinged to both sides of the housing, a rotating frame rotatably connected to both sides of the housing, a push rod fixed in the middle of the rotating frame, the output shaft end of the electric telescopic rod rotatably connected to the push rod of the rotating frame, a connecting frame fixed to both sides of the rotating frame, and a lifting rod fixed to both sides of the movable valve seat, with the lifting rod slidably connected to the connecting frame.

[0009] Preferably, sliding columns are fixed on both sides of the lifting rod, and sliding holes are provided on both sides of the connecting frame, with the sliding columns slidably connected inside the sliding holes.

[0010] Preferably, an inflation component is provided on both sides of the movable valve seat, and an inflation cavity is provided inside the sealing gasket. The inflation component is used to inflate the inflation cavity of the sealing gasket.

[0011] Preferably, the inflation assembly includes telescopic cavities formed on both sides inside the movable valve seat, an air guide hole is formed below the telescopic cavity, the air guide hole can communicate with the interior of the sealing gasket, a piston is slidably connected inside the telescopic cavity, a lifting rod is fixed at the top of the piston, the lifting rod extends outward from the top of the movable valve seat, and multiple guide grooves are formed at the bottom of the sealing plate.

[0012] Preferably, a spring is fixed to the bottom end of the piston, and the bottom end of the spring is fixedly connected to the bottom end inside the telescopic cavity.

[0013] Preferably, the surface of the sealing gasket is provided with a plurality of triangular grooves, and two sealing gaskets can be inserted into each other through the surface of the triangular grooves; The triangular groove can deform when the gasket is inflated.

[0014] Preferably, the gate is provided with a raised edge on the outside, and the raised edge matches the shape of the inner side of the sealing gasket.

[0015] Preferably, the sealing plate has a groove on its outer side, and a sealing ring is provided inside the groove. The outer side of the sealing ring can be tightly attached to the inner wall of the outer shell.

[0016] Preferably, the sealing plate has two liquid storage chambers inside, the liquid storage chambers are filled with lubricating oil, and an output hole is provided between the liquid storage chambers and the groove.

[0017] The beneficial effects of this invention are as follows: 1. The wear-resistant and leak-proof gate valve of the present invention controls the moving valve seat by setting a switch assembly. Before the gate is raised, the moving valve seats on both sides are separated outward. After the gate is lowered into place, the moving valve seats are clamped inward to clamp the gate. This prevents sliding friction between the gate and the sealing gasket during the raising and lowering process, reduces the wear of the sealing gasket, and avoids valve leakage caused by the wear of the sealing gasket.

[0018] 2. The wear-resistant and leak-proof gate valve of the present invention, by setting an inflation component inside the movable valve seat, when the movable valve seat clamps the gate plate, the guide groove at the bottom of the sealing plate pushes the push rod and piston, and forces the air in the telescopic cavity into the cavity inside the sealing gasket, so that the sealing gasket expands and tightly fits the gate plate, thereby realizing automatic compensation of sealing pressure. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the internal structure of the outer shell in this invention; Figure 3 This is a schematic diagram of the movable valve seat structure in this invention; Figure 4 This is a schematic diagram of the internal structure of the movable valve seat in this invention; Figure 5 This is a schematic diagram of the sealing gasket structure in this invention; Figure 6 yes Figure 5 Enlarged view of a portion of point A in the middle; Figure 7 This is a schematic diagram of the gate structure in this invention; Figure 8 This is a partial cross-sectional schematic diagram of the sealing plate in this invention.

[0021] In the diagram: 1. Outer shell; 11. Liquid inlet; 12. Liquid outlet; 13. Turntable; 131. End cap; 132. Threaded rod; 133. Sealing plate; 134. Gate; 135. Raised edge; 136. Sealing ring; 137. Groove; 138. Liquid storage chamber; 1381. Output hole; 139. Guide groove; 14. Electric telescopic rod; 141. Rotating frame; 142. Connecting frame; 143. Sliding hole; 144. Lifting rod; 145. Sliding column; 15. Moving valve seat; 151. Telescopic cavity; 152. Piston; 153. Lifting rod; 154. Spring; 155. Air vent; 156. Sealing gasket; 157. Triangular groove. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] like Figures 1 to 5 As shown in the embodiment of the present invention, an anti-wear and anti-leakage gate valve includes an outer shell 1. An inlet end 11 is provided on one side of the outer shell 1, and an outlet end 12 is provided on the other side of the outer shell 1. An end cap 131 is installed on the top of the outer shell 1. A threaded rod 132 is rotatably connected inside the end cap 131. A turntable 13 is fixed at the top of the threaded rod 132. A sealing plate 133 is threadedly connected to the bottom of the threaded rod 132. A gate plate 134 is fixed at the bottom of the sealing plate 133. Two symmetrical movable valve seats 15 are provided on both sides inside the outer shell 1. A sealing gasket 156 is provided on the side of the movable valve seat 15 near the gate plate 134. Switching assemblies are provided on both sides of the movable valve seat 15 for driving the movable valve seat 15 to clamp or move away from the gate plate 134. Specifically, when the gate 134 is raised, the movable valve seat 15 separates to both sides, and after the gate 134 is lowered, the movable valve seats 15 on both sides clamp onto the gate 134.

[0024] During use, the inlet end 11 is connected to the end of the input pipe via fasteners, and the outlet end 12 is connected to the end of the output pipe via fasteners. In the closed state, the two movable valve seats 15 are in the state of clamping the gate 134. At this time, under the sealing effect of the sealing gasket 156, the interior of the outer shell 1 is divided into two cavities. The liquid input through the inlet end 11 is separated into the cavity near the inlet end 11, while no liquid enters the cavity near the outlet end 12. This can disconnect the pipeline. When it is necessary to connect the input pipe and the output pipe, the turntable 13 is rotated to drive the screw. The threaded rod 132 rotates, and the rotation of the threaded rod 132 inside the sealing plate 133 and the gate 134 can pull the gate 134 upward. At this time, the gate 134 separates from the movable valve seat 15, allowing water to flow through the inside of the movable valve seat 15, so that the water flows inside the outer shell 1. Rotating the turntable 13 in the opposite direction can move the gate 134 downward and insert it between it and the movable valve seat 15 to block the inside of the outer shell 1. By driving the sealing gasket 156 to clamp through the two movable valve seats 15, the inside of the outer shell 1 can be blocked with the gate 134 and the sealing plate 133, thereby realizing the interruption of liquid flow. During the raising and lowering of the gate 134, friction occurs on the surface of the sealing gasket 156, leading to significant wear and a shorter service life. This can result in leakage after wear. Therefore, a switching assembly is installed to control the moving valve seat 15. When the gate 134 needs to be raised, the switching assembly moves the moving valve seat 15 to both sides. At this time, the moving valve seat 15 separates the sealing gasket 156 from the gate 134. Then, the turntable 13 is rotated to raise the gate 134, eliminating friction between the gate 134 and the sealing gasket 156, significantly reducing friction during use. When the gate 134 descends, the gate 134 descends first. When the gate 134 descends to the lowest point, the switching assembly drives the movable valve seat 15 to move closer to the gate 134. At this time, the movable valve seat 15 can clamp the gate 134, thereby sealing the space between the movable valve seat 15 and the gate 134 with the sealing gasket 156. This reduces the friction between the gate 134 and the sealing gasket 156 and extends the service life of the sealing gasket 156. At the same time, the movable valve seat 15 is set to separate from the gate 134 in advance before the gate 134 rises or falls, which can reduce the friction between the movable valve seat 15 and the gate 134 and extend the service life of the movable valve seat 15.

[0025] like Figures 1 to 3 As shown, the switch structure includes an electric telescopic rod 14 hinged to both sides of the housing 1. A rotating frame 141 is rotatably connected to both sides of the housing 1. A push rod is fixed in the middle of the rotating frame 141. The output shaft end of the electric telescopic rod 14 is rotatably connected to the push rod of the rotating frame 141. A connecting frame 142 is fixed to both sides of the rotating frame 141. A lifting rod 144 is fixed to both sides of the movable valve seat 15. The lifting rod 144 is slidably connected to the connecting frame 142.

[0026] In use, the movable valve seat 15 needs to be switched to move away from and close to the gate plate 134. When the movable valve seat 15 needs to move away from the gate plate 134, the electric telescopic rods 14 on both sides are activated to pull the push rod of the rotating frame 141. At this time, the rotating frame 141 drives the connecting frames 142 on both sides to rotate. The connecting frames 142 on both sides pull the lifting rod 144. When the lifting rods 144 on both sides are pulled at the same time, they move horizontally inside the outer shell 1, thereby moving the two movable valve seats 15 away from the gate plate 134. When it is necessary to close the movable valve seat 15 to the gate plate 134, the electric telescopic rods 14 are activated to push the push rod of the rotating frame 141 downward. The rotating frame 141 can rotate in the opposite direction, thereby pushing the lifting rod 144 through the connecting frame 142, so that the moving valve seat 15 is pressed against the gate 134. This facilitates the contact and separation between the moving valve seat 15 and the gate 134. Since the connecting frame 142 swings in an arc with the rotating frame 141, while the lifting rod 144 moves in a horizontal straight line, there is a deviation between the two motion trajectories. Therefore, the connecting frame 142 is connected to the lifting rod 144 by a sliding hole and a sliding column. During the rotation, the sliding column can slide freely in the sliding hole, adaptively adjusting the fit position to offset the positional deviation caused by the arc motion and the straight line motion, and avoid transmission interference and jamming. During gate adjustment, the threaded rod can only drive the gate 134 to rotate after the movable valve seat 15 is completely separated into place to avoid friction between the gate and the sealing gasket. After the gate 134 is lowered into place, the movable valve seat 15 can be controlled to fit and seal to prevent the gate from jamming or the seal from being delayed. To ensure reliable execution of the action sequence, the device can be equipped with displacement sensors to detect the moving stroke of the movable valve seat 15 and the lifting position of the gate 134. The control system is set with an interlock program so that the next actuator can only be started after the sensor feedback component is in place, to avoid erratic operation. Both ends of the lifting rod 144 are equipped with sealing plugs. When the lifting rod 144 slides to one end and is close to the telescopic hole, the sealing plug can seal the telescopic hole, thus preventing leakage through the telescopic hole.

[0027] like Figures 1 to 3 As shown, sliding columns 145 are fixed on both sides of the lifting rod 144, and sliding holes 143 are opened on both sides of the connecting frame 142. The sliding columns 145 are slidably connected inside the sliding holes 143.

[0028] As the movable valve seat 15 moves inside the housing 1, the connecting frame 142 rotates upward. However, since the lifting rod 144 remains horizontal during movement, the connection position between the lifting rod 144 and the connecting frame 142 needs to be switched in real time. Therefore, a sliding hole 143 is opened inside the connecting frame 142, and the sliding column 145 is slidably connected inside the sliding hole 143. When the connecting frame 142 rotates upward, the sliding column 145 slides adaptively inside the sliding hole 143. At the same time, the power is transmitted to the sliding column 145 through the edge of the sliding hole 143, thereby avoiding interference between the connection between the connecting frame 142 and the lifting rod 144.

[0029] like Figures 1 to 4 As shown, both sides of the movable valve seat 15 are provided with inflation components, and the sealing gasket 156 has an inflation cavity inside. The inflation components are used to inflate the inflation cavity of the sealing gasket 156.

[0030] During use, the sealing gasket 156 is in an uninflated state as the movable valve seat 15 is close to and away from the gate 134. When the gate 134 moves downward and the movable valve seat 15 needs to be clamped, the movable valve seat 15 is attached to both sides of the inner wall of the outer shell 1. During the downward movement of the gate 134, the guide groove 139 at the bottom of the sealing plate 133 is sleeved on the outside of the lifting rod 153. The guide groove 139 is set as a closed sink structure and the two sides of the groove are provided with limiting baffles. The guide groove 139 covers the entire travel of the lifting rod 153 and laterally limits the lifting rod 153 to restrict the lifting rod 153 from deflection and disengagement. After the gate 134 is in place, the lifting rod 153 is inserted into the deepest position of the guide groove 139 and the height of the lifting rod 153 is fixed. Subsequently, the movable valve seat 15 moves toward the gate 134 and completes mechanical clamping. After the movable valve seat 15 is clamped in place, the slope of the guide groove 139 pushes the lifting rod 153 to move into the telescopic cavity 151. The lifting rod 153 drives the piston 152 to compress the air inside the telescopic cavity 151. The air inside the telescopic cavity 151 is introduced into the sealing gasket 156 through the air guide hole 155 and the sealing gasket 156 expands, thereby achieving a seal between the movable valve seat 15 and the gate 134.

[0031] like Figures 1 to 8 As shown, the inflation assembly includes telescopic cavities 151 on both sides inside the movable valve seat 15. An air guide hole 155 is provided below the telescopic cavity 151, which can communicate with the interior of the sealing gasket 156. A piston 152 is slidably connected inside the telescopic cavity 151. A lifting rod 153 is fixed to the top of the piston 152. The lifting rod 153 extends outward from the top of the movable valve seat 15. A plurality of guide grooves 139 are provided at the bottom of the sealing plate 133.

[0032] During the process of moving the valve seat 15 against and away from the gate 134, the sealing gasket 156 remains uninflated. When the gate 134 moves downward and the moving valve seat 15 needs to clamp the gate 134, the moving valve seat 15 will be in a position against both sides of the inner wall of the outer casing 1. At the same time, during the descent of the gate 134, the guide groove 139 at the bottom of the sealing plate 133 will be fitted onto the outside of the lifting rod 153. This position will cause the lifting rod 153 to be inserted into the deepest part of the guide groove 139, thereby keeping the lifting rod 153 in place. The height is adjusted, and then the movable valve seat 15 clamps against the outside of the gate 134. During this process, the movable valve seat 15 drives the lifting rod 153 to slide inside the guide groove 139. The slope of the guide groove 139 guides the lifting rod 153, causing the lifting rod 153 to push the piston 152 into the telescopic cavity 151. This causes the air inside the telescopic cavity 151 to be filled into the sealing gasket 156 through the air guide hole 155, thereby causing the sealing gasket 156 to expand and seal the movable valve seat 15 and the gate 134.

[0033] like Figures 1 to 4 As shown, a spring 154 is fixed to the bottom end of the piston 152, and the bottom end of the spring 154 is fixedly connected to the bottom end inside the telescopic cavity 151.

[0034] As the movable valve seat 15 moves away from both sides of the gate 134, the movable valve seat 15 drives the lifting rod 153 to slide in the opposite direction inside the guide groove 139. During this process, the elastic force of the spring 154 will push the piston 152 upward. The piston 152 drives the lifting rod 153 to extend upward, which can make the lifting rod 153 automatically reset. At the same time, when the piston 152 moves upward, it draws in air inside the sealing gasket 156 through the air guide hole 155, thereby causing the sealing gasket 156 to actively retract to the initial state, reducing the friction between the movable valve seat 15 and the inside of the outer shell 1 when the sealing gasket 156 moves.

[0035] like Figures 1 to 6 As shown, the surface of the sealing gasket 156 is provided with a plurality of triangular grooves 157, and two sealing gaskets 156 can be inserted into each other through the surface of the triangular grooves 157. When the sealing gasket 156 is inflated, the triangular groove 157 can deform.

[0036] During use, the liquid medium flows inside the outer shell 1. Solid particles mixed in the medium are easy to adhere to the surface of the sealing gasket 156. When the sealing gasket 156 and the gate 134 are in contact and sealed, hard solid particles are easy to be trapped between the sealing contact surfaces, resulting in loose sealing surfaces. A triangular groove 157 is provided on the sealing gasket 156. The sealing gasket 156 is made of elastic sealing material. During the inflation and pressurization process, the internal air pressure of the sealing gasket gradually increases. The groove wall of the triangular groove 157 undergoes elastic deformation under the action of internal air pressure. The sharp corner groove structure of the triangular groove will undergo a complex deformation action of squeezing, opening, and retracting. Compared to a flat sealing surface, the triangular groove 157 undergoes continuous changes in its curvature and contact angle during deformation. This breaks the adhesion between solid particles and the sealing gasket surface, causing solid particles attached to the groove wall of the triangular groove 157 and the sealing gasket surface to fall downwards under the action of deformation shear force and gravity. The detached solid particles can be carried out of the valve body with the subsequent flow of liquid medium, preventing particles from remaining on the sealing contact surface. At the same time, the triangular groove can adapt to the surface curvature of the gate 134 during deformation for adaptive fitting, further eliminating fitting gaps and effectively avoiding sealing failure caused by solid particles.

[0037] like Figures 1 to 7 As shown, the gate 134 has a raised edge 135 on its outer side, and the raised edge 135 matches the inner shape of the sealing gasket 156.

[0038] During the sealing process of the gate 134 by the sealing gasket 156, a raised edge 135 is provided to improve the sealing performance. When the sealing gasket 156 contacts the gate 134, the raised edge 135 can provide more corners at the connection, and can limit the position of the sealing gasket 156 after deformation, making it easier to seal.

[0039] like Figures 1 to 8 As shown, a groove 137 is provided on the outer side of the sealing plate 133, and a sealing ring 136 is provided inside the groove 137. The outer side of the sealing ring 136 can be tightly attached to the inner wall of the outer shell 1.

[0040] During the use of the sealing plate 133, there may be gaps between the sealing plate 133 and the inner wall of the outer shell 1. Therefore, it is necessary to seal the sealing plate 133 and the inner wall of the outer shell 1. Thus, a groove 137 is provided on the outer side of the sealing plate 133, and a sealing ring 136 is provided inside the groove 137. The sealing ring 136 fills the gap between the sealing plate 133 and the inner wall of the outer shell 1, thereby preventing liquid from leaking to the other side through the top of the sealing plate 133.

[0041] like Figures 1 to 8 As shown, the sealing plate 133 has two liquid storage chambers 138 inside, the liquid storage chambers 138 are filled with lubricating oil, and an output hole 1381 is provided between the liquid storage chambers 138 and the groove 137.

[0042] During use, since the sealing plate 133 needs to be raised and lowered each time the gate 134 is switched on and off, the sealing ring 136 will rub against the inner wall of the outer casing 1 more times. To reduce the wear caused by friction, lubricating oil is filled into the reservoir 138. The reservoir 138 inputs lubricating oil into the groove 137 through the output hole 1381. Because the inner wall of the outer casing 1 presses against the outer side of the sealing ring 136, the inner side of the sealing ring 136 is tightly fitted against the inner wall of the groove 137. This fit will evenly squeeze the lubricating oil into the groove 137, preventing the lubricating oil from depositing at the bottom of the groove 137. The lubricating oil is then distributed through the groove 137. Lubricating oil is distributed on the surface of the sealing ring 136. When the outer side of the sealing ring 136 is in a wetted state, the friction between it and the outer shell 1 is small, which can maintain the state of the sealing ring 136. When the lubricating oil on the outer side of the sealing ring 136 is consumed, the sealing ring 136 is placed inside the groove 137 and wetted with lubricating oil. The friction on the outer side of the sealing ring 136 is greater than the friction on the inner side of the groove 137. Thus, under the action of the inner wall of the outer shell 1, the sealing ring 136 rotates inside the groove 137. Because the surface of the sealing ring 136 is wetted with lubricating oil, the friction during the rotation is small, thus automatically applying lubricating oil to the surface of the sealing ring 136.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wear-resistant and leak-proof gate valve, characterized in that: The device includes an outer casing, with an inlet end on one side and an outlet end on the other side. An end cap is installed on the top of the outer casing, and a threaded rod is rotatably connected inside the end cap. A turntable is fixed to the top of the threaded rod, and a sealing plate is threaded to the bottom of the threaded rod. A gate plate is fixed to the bottom of the sealing plate. Two symmetrical movable valve seats are provided on both sides inside the outer casing. A sealing gasket is provided on the side of the movable valve seat near the gate plate. Switching assemblies are provided on both sides of the movable valve seats for driving the movable valve seats to clamp or move away from the gate plate. Specifically, before the gate is raised, the movable valve seats separate to both sides, and after the gate is lowered, the movable valve seats on both sides clamp onto the gate.

2. The wear-resistant and leak-proof gate valve according to claim 1, characterized in that: The switch structure includes an electric telescopic rod hinged to both sides of the outer casing. A rotating frame is rotatably connected to both sides of the outer casing. A push rod is fixed in the middle of the rotating frame. The output shaft end of the electric telescopic rod is rotatably connected to the push rod of the rotating frame. A connecting frame is fixed to both sides of the rotating frame. A lifting rod is fixed to both sides of the movable valve seat. The lifting rod is slidably connected to the connecting frame.

3. The wear-resistant and leak-proof gate valve according to claim 2, characterized in that: Both sides of the lifting rod are fixed with sliding columns, and both sides of the connecting frame are provided with sliding holes, with the sliding columns slidably connected inside the sliding holes.

4. The wear-resistant and leak-proof gate valve according to claim 2, characterized in that: Both sides of the movable valve seat are provided with inflation components, and the sealing gasket has an inflation cavity inside. The inflation components are used to inflate the inflation cavity of the sealing gasket.

5. The wear-resistant and leak-proof gate valve according to claim 4, characterized in that: The inflation assembly includes telescopic cavities on both sides of the inside of the movable valve seat. An air guide hole is provided below the telescopic cavity, which can communicate with the inside of the sealing gasket. A piston is slidably connected inside the telescopic cavity. A lifting rod is fixed to the top of the piston. The lifting rod extends outward from the top of the movable valve seat. Multiple guide grooves are provided at the bottom of the sealing plate.

6. The wear-resistant and leak-proof gate valve according to claim 5, characterized in that: A spring is fixed to the bottom end of the piston, and the bottom end of the spring is fixedly connected to the bottom end inside the telescopic cavity.

7. The wear-resistant and leak-proof gate valve according to claim 5, characterized in that: The surface of the sealing gasket is provided with multiple triangular grooves, and two sealing gaskets can be inserted into each other through the surface of the triangular grooves. The triangular groove can deform when the gasket is inflated.

8. The wear-resistant and leak-proof gate valve according to claim 5, characterized in that: The gate is provided with a raised edge on the outside, and the raised edge matches the shape of the inner side of the sealing gasket.

9. The wear-resistant and leak-proof gate valve according to claim 1, characterized in that: The sealing plate has a groove on its outer side, and a sealing ring is provided inside the groove. The outer side of the sealing ring can be tightly attached to the inner wall of the outer shell.

10. The wear-resistant and leak-proof gate valve according to claim 9, characterized in that: The sealing plate has two liquid storage chambers inside, each containing lubricating oil, and an output hole is provided between the liquid storage chamber and the groove.

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