Gate valve

Abstract

The invention provides a gate valve and relates to the technical field of valves, the gate valve comprises a valve body, a valve cover and a valve plate, and the end face, close to a valve cavity, of a flow channel is provided with a first sealing face; the valve plate comprises a shell, a first sliding groove with an opening in the bottom is formed in the shell, second sliding grooves are formed in the two sides of the first sliding groove respectively, a wedge-shaped block which is gradually shrunk from bottom to top is arranged in the first sliding groove in a lifting mode, a sealing block is arranged in each second sliding groove in a sliding mode, and the sealing blocks are connected with the shell through second elastic components. The sides, close to each other, of the two sealing blocks are matched with the wedge-shaped faces on the two sides of the wedge-shaped block correspondingly, and the sides, away from each other, of the two sealing blocks are provided with second sealing faces matched with the first sealing faces. The jacking component is used for jacking the wedge block upwards; the executing mechanism is used for driving the valve plate to lift; the pressure detection module is used for detecting the pressure between the wedge-shaped block and the sealing block; the gate valve solves the problem that in the prior art, when the gate valve is closed, the sealing force of a gate plate cannot be controlled or detected.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, and more specifically, relates to a gate valve capable of detecting the sealing strength of a valve plate. Background Art

[0002] The gate valve is a common type of valve, which is characterized by the gate of its closing member moving in the vertical direction along the center line of the passage, and the sealing is achieved by pressing the sealing surfaces on both sides of the gate with the sealing surfaces at the end of the flow channel. The main function of the gate valve in the pipeline is to cut off the medium. It can be used for low temperature and low pressure or high temperature and high pressure, and can be used for various media according to the different materials of the valve. However, the pressure conditions that the gate valve can be used for are related to the sealing strength of its gate. The existing gate valve cannot control or detect the sealing strength of its gate when it is closed, which limits its scope of use and the reliability of cutting off the medium. Summary of the invention

[0003] The purpose of the present invention is to provide a gate valve in view of the deficiencies in the prior art, so as to solve the problem that the sealing strength of the gate plate of the gate valve in the prior art cannot be controlled or detected when the gate valve is closed.

[0004] In order to achieve the above object, the present invention provides a gate valve, comprising:

[0005] A valve body, wherein a valve cavity is disposed in the valve body, flow channels are disposed on both sides of the valve cavity, an upper chamber and a lower chamber are disposed above and below the valve cavity respectively, and a first sealing surface is disposed on an end surface of the flow channel close to the valve cavity;

[0006] A valve cover, which is detachably connected to the top of the valve body and is used to block the upper chamber;

[0007] A valve plate, the valve plate is movably arranged in the valve cavity, the valve plate includes a shell, a first slide groove with a bottom opening is arranged inside the shell, second slide grooves are arranged on both sides of the first slide groove, a wedge block which is gradually contracted from bottom to top is movably arranged in the first slide groove, the wedge block is connected to the shell through a first elastic component, a sealing block is slidably arranged in each of the second slide grooves, the sealing block is connected to the shell through a second elastic component, the two sealing blocks are matched with the wedge surfaces on both sides of the wedge block on the sides close to each other, and the two sealing blocks are provided with a second sealing surface matched with the first sealing surface on the sides away from each other;

[0008] A lifting component, the lifting component is arranged in the middle of the lower chamber, and the lifting component is used to push the wedge block upward, so that the second sealing surface is pressed against the first sealing surface, and the first elastic component and the second elastic component are compressed;

[0009] An actuator, which is arranged on the upper part of the valve body and connected to the valve plate, and is used to drive the valve plate to rise and fall;

[0010] A pressure detection module, wherein the pressure detection module is used to detect the pressure between the wedge block and the sealing block.

[0011] Optionally, a sealing ring is respectively provided at the end portions of the two flow channels that are close to each other, and the end surfaces of the two sealing rings that are close to each other respectively form the first sealing surfaces, and the first sealing surfaces are arranged at an angle so that the two first sealing surfaces form a V-shaped arrangement, and the axes of the two second slide grooves form an angle so that the two second sealing surfaces also form a V-shaped arrangement.

[0012] Optionally, the pressure detection module includes a pressure sensor and a pressure display component, the pressure sensor is arranged on the wedge surface of the wedge block, the pressure display component is electrically connected to the pressure sensor, and the pressure display component is arranged on the actuator.

[0013] Optionally, the first elastic component is arranged between the upper end of the wedge block and the upper wall of the first slide groove, a lifting column is arranged in the bottom opening of the first slide groove, the lower end of the lifting column is provided with a guide end which tapers from top to bottom, the lifting component includes a lifting seat, and the top of the lifting seat is provided with a guide groove matching the guide end.

[0014] Optionally, elastic grooves are respectively provided on the upper side wall and the lower side wall of the second slide groove, and sliding blocks are respectively provided on the upper end and the lower end of the sealing block. The sliding blocks are slidably arranged in the elastic grooves and connected to the groove walls of the elastic grooves through the second elastic component.

[0015] Optionally, a receiving groove is provided on the slide groove wall at the ends away from each other of the two second slide grooves, and a deformable protective component is provided in the receiving groove. When the valve plate is in an open state, the second sealing surface is in the first slide groove, and the protective component covers the second sealing surface. When the valve plate is in a closed state, the second sealing surface extends out of the second slide groove and the protective component is embedded in the receiving groove.

[0016] Optionally, a scraper is provided on both sides of the lower end of the shell, and the scrapers are arranged obliquely so that the two scrapers form an eight-shaped arrangement, and the lower end of the scraper is used to elastically contact the first sealing surface to clean the first sealing surface.

[0017] Optionally, when the valve plate is in an open state, the lower end of the scraper is above the first sealing surface, and when the valve plate is in a closed state, the scraper is in the lower chamber and on both sides of the lifting component.

[0018] Optionally, a first tapered surface is provided on the outer periphery of the first sealing surface, and when the valve plate is opened, the lower end of the scraper is located on the first tapered surface.

[0019] Optionally, the actuator includes a valve stem, a valve frame and a handwheel, the valve frame is arranged above the valve cover, the handwheel is rotatably arranged above the valve frame, the lower end of the valve stem is rotatably connected to the valve plate, and the upper end of the valve stem cooperates with the internal thread of the handwheel through an external thread.

[0020] The present invention provides a gate valve, which has the following beneficial effects: the valve plate of the gate valve is lifted and lowered in the valve cavity and the upper cavity. When the valve plate is closed, the valve plate is in the valve cavity and presses the first sealing surface at the end of the flow channel through the second sealing surface of the sealing block to achieve sealed closure. When the valve plate is opened, the valve plate rises into the upper cavity and the flow channel opens. The lifting and lowering of the valve plate is driven by an actuator. The lifting component in the lower cavity can push the wedge block upward as the valve plate descends during the closing process of the valve plate. When the wedge block slides upward, the contact between the wedge surface and the sealing block squeezes the sealing block and pushes the sealing block outward, so that the second sealing surface presses the first sealing surface. In this way, the force of the valve plate squeezing the first sealing surface can be controlled by adjusting the downward force applied to the valve plate by the actuator. At the same time, due to the setting of the pressure detection module, the pressure between the wedge block and the sealing block can be detected to characterize the sealing force of the valve plate and to indicate the sealing force, so as to control the sealing force to adapt to different pressure conditions.

[0021] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0023] Figure 1 A schematic structural diagram of a gate valve according to an embodiment of the present invention is shown.

[0024] Figure 2 A schematic structural diagram of a valve plate of a gate valve according to an embodiment of the present invention is shown.

[0025] Figure 3 Shows Figure 2 A partial enlarged schematic diagram of .

[0026] Figure 4 A schematic structural diagram of a gate valve protective component covering a second sealing surface according to an embodiment of the present invention is shown.

[0027] Description of reference numerals:

[0028] 1. Valve body; 2. Flow channel; 3. Upper chamber; 4. Lower chamber; 5. Valve cover; 6. Valve plate; 7. Shell; 8. Wedge block; 9. First elastic component; 10. Sealing block; 11. Second elastic component; 12. First sealing surface; 13. Second sealing surface; 14. Sealing ring; 15. Pressure sensor; 16. Pressure display component; 17. Lifting column; 18. Guide end; 19. Lifting seat; 20. Guide groove; 21. Elastic groove; 22. Sliding block; 23. Accommodating groove; 24. Protective component; 25. Rubber plate; 26. Connecting arm; 27. Scraper; 28. First tapered surface; 29. ​​Second tapered surface; 30. Valve stem; 31. Valve frame; 32. Handwheel. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0030] like Figures 1 to 4 As shown, the present invention provides a gate valve, comprising:

[0031] A valve body 1 is provided with a valve cavity in the valve body 1, flow channels 2 are provided on both sides of the valve cavity, an upper chamber 3 and a lower chamber 4 are provided above and below the valve cavity, respectively, and a first sealing surface 12 is provided on the end surface of the flow channel 2 close to the valve cavity;

[0032] A valve cover 5, which is detachably connected to the top of the valve body 1 and is used to seal the upper chamber 3;

[0033] A valve plate 6 is provided in a liftable manner in the valve cavity. The valve plate 6 includes a housing 7. A first slide groove with a bottom opening is provided inside the housing 7. Second slide grooves are provided on both sides of the first slide groove. A wedge block 8 which is gradually reduced from bottom to top is provided in the first slide groove. The wedge block 8 is connected to the housing 7 through a first elastic component 9. A sealing block 10 is slidably provided in each second slide groove. The sealing block 10 is connected to the housing 7 through a second elastic component 11. The sides of the two sealing blocks 10 which are close to each other respectively cooperate with the wedge surfaces on both sides of the wedge block 8. The sides of the two sealing blocks 10 which are far away from each other are provided with a second sealing surface 13 which cooperates with the first sealing surface 12.

[0034] A lifting component, which is arranged in the middle of the lower chamber 4 and is used to push the wedge block 8 upward, so that the second sealing surface 13 is pressed against the first sealing surface 12, and the first elastic component 9 and the second elastic component 11 are compressed;

[0035] The actuator is arranged on the upper part of the valve body 1 and connected to the valve plate 6 to drive the valve plate 6 to rise and fall;

[0036] The pressure detection module is used to detect the pressure between the wedge block 8 and the sealing block 10.

[0037] Specifically, in order to solve the problem in the prior art that the sealing strength of the gate plate of the gate valve cannot be controlled or detected when the gate valve is closed; the valve plate 6 of the gate valve provided by the present invention is lifted and lowered in the valve cavity and the upper chamber 3. When it is closed, the valve plate 6 is in the valve cavity and presses the first sealing surface 12 at the end of the flow channel 2 through the second sealing surface 13 of the sealing block 10 to achieve sealed closure. When it is opened, the valve plate 6 rises to the upper chamber 3 and the flow channel 2 is opened; the lifting and lowering of the valve plate 6 is driven by the actuator, and the lifting component in the lower chamber 4 can be lifted and lowered as the valve plate 6 descends during the closing process of the valve plate 6. The wedge block 8 is pushed up, and while the wedge block 8 slides upward, the sealing block 10 is squeezed and pushed outward through the contact between the wedge surface and the sealing block 10, so that the second sealing surface 13 presses the first sealing surface 12. In this way, the force of the valve plate 6 squeezing the first sealing surface 12 can be controlled by adjusting the downward force applied to the valve plate 6 by the actuator. At the same time, due to the setting of the pressure detection module, the pressure between the wedge block 8 and the sealing block 10 can be detected, so as to characterize the sealing force of the valve plate 6 and realize the indication of the sealing force, so as to control the sealing force to adapt to different pressure conditions.

[0038] Optionally, a sealing ring 14 is respectively provided at the end portions of the two flow channels 2 that are close to each other, and the end surfaces of the two sealing rings 14 that are close to each other respectively form a first sealing surface 12. The first sealing surfaces 12 are inclined so that the two first sealing surfaces 12 form a V-shaped arrangement, and the axes of the two second slide grooves form an angle so that the two second sealing surfaces 13 also form a V-shaped arrangement.

[0039] Specifically, a sealing ring 14 is used to form the first sealing surface 12, and the sealing ring 14 can be easily disassembled to clean or polish the first sealing surface 12. The inclination angle of the first sealing surface 12 is the same as the inclination angle of the second sealing surface 13. The sealing block 10 slides along the axis of the second slide groove, and can fit with the first sealing surface 12 and be pressed under the action of the wedge block 8, thereby closing the gate valve.

[0040] Optionally, the pressure detection module includes a pressure sensor 15 and a pressure display component 16, the pressure sensor 15 is arranged on the wedge surface of the wedge block 8, the pressure display component 16 is electrically connected to the pressure sensor 15, and the pressure display component 16 is arranged on the actuator.

[0041] Specifically, the pressure detection module detects the pressure applied by the wedge block 8 to the sealing block 10 through the pressure sensor 15, so as to characterize the sealing strength of the second sealing surface 13 of the sealing block 10 to the first sealing surface 12 of the sealing ring 14, and displays it through the pressure display component 16. The pressure display component 16 can directly display the detection result of the pressure sensor 15, or display the converted sealing pressure value. Regardless of the display method, the operator can understand the sealing strength between the second sealing surface 13 and the first sealing surface 12, so as to operate the actuator according to different medium pressure requirements and accurately control the sealing strength.

[0042] Optionally, the first elastic component 9 is arranged between the upper end of the wedge block 8 and the upper wall of the first slide groove, a lifting column 17 is arranged in the bottom opening of the first slide groove, the lower end of the lifting column 17 is provided with a guide end 18 which tapers from top to bottom, the lifting component includes a lifting seat 19, and the top of the lifting seat 19 is provided with a guide groove 20 which cooperates with the guide end 18.

[0043] Specifically, the lifting column 17 passes through the opening at the bottom of the first slide groove and extends to the outside of the shell 7. As the actuator drives the valve plate 6 to descend, the guide end 18 of the lifting column 17 is inserted into the guide groove 20 on the top of the lifting seat 19 to guide the valve plate 6 so that the two second sealing surfaces 13 on both sides of the valve plate 6 evenly press the two first sealing surfaces 12. As the valve plate 6 further descends, the lifting seat 19 supports the lifting column 17, so that the wedge block 8 moves in the first slide groove, and the wedge block 8 rises relative to the shell 7, pushing the sealing block 10 outward through the wedge surface, so that the sealing block 10 extends outward from both sides of the shell 7 and presses the first sealing surface 12; at the same time, when the gate valve is in the open state, the first elastic component 9 can make the wedge block 8 move downward in the shell 7 to achieve reset.

[0044] Optionally, elastic grooves 21 are respectively provided on the upper side wall and the lower side wall of the second slide groove, and sliders 22 are respectively provided on the upper end and the lower end of the sealing block 10. The slider 22 is slidably set in the elastic groove 21 and connected to the groove wall of the elastic groove 21 through the second elastic component 11.

[0045] Specifically, the sliders 22 at the upper and lower ends of the sealing block 10 are respectively slidably set in an elastic groove 21, the elastic groove 21 can guide the movement of the slider 22, and through the second elastic component 11 between the elastic groove 21 and the slider 22, the sealing block 10 can be reset when the gate valve is in the open state.

[0046] In this embodiment, the first elastic component 9 and the second elastic component 11 are compression springs.

[0047] Optionally, a receiving groove 23 is provided on the slide groove wall at the ends away from each other of the two second slide grooves, and a deformable protective component 24 is provided in the receiving groove 23. When the valve plate 6 is in an open state, the second sealing surface 13 is in the first slide groove, and the protective component 24 covers the second sealing surface 13. When the valve plate 6 is in a closed state, the second sealing surface 13 extends out of the second slide groove and the protective component 24 is embedded in the receiving groove 23.

[0048] Specifically, the protective component 24 can adopt a ring-shaped arranged brush or elastic rubber ring, the outer periphery of the brush or elastic rubber ring is connected to the groove wall of the receiving groove 23 close to the wedge block 8. When the valve plate 6 is in the open state, the sealing block 10 is in the retracted state, and the second sealing surface 13 on the sealing block 10 is just covered by the brush or elastic rubber ring, which can prevent particles in the medium from being deposited or attached to the second sealing surface 13 and affecting the sealing effect of the gate valve. When the gate is closed, the sealing block 10 extends outward, the brush or elastic rubber ring undergoes elastic deformation, and is pushed and squeezed outward by the sealing block 10 and embedded in the receiving groove 23, without affecting the second sealing surface 13 of the sealing block 10 extending out of the housing 7 to press the first sealing surface 12 on the sealing ring 14.

[0049] In this embodiment, the gate valve is a medium-to-large gate valve with a relatively large nominal diameter. The protective component 24 includes a plurality of fan-shaped rubber plates 25, a plurality of connecting arms 26 and a third elastic component. One end of each connecting arm 26 is rotatably connected to a side wall of the accommodating groove 23 close to the wedge block 8, and the other end of each connecting arm 26 is connected to a fan-shaped rubber plate 25. The third elastic component is a torsion spring, which is sleeved on the rotating shaft, and by applying torque to the connecting arm 26, the plurality of rubber plates 25 can be pressed on the second sealing surface 13 to form a complete annular structure.

[0050] Optionally, a scraper 27 is provided on both sides of the lower end of the shell 7 respectively. The scraper 27 is inclined so that the two scrapers 27 form an eight-shaped arrangement. The lower end of the scraper 27 is used to elastically contact the first sealing surface 12 to clean the first sealing surface 12.

[0051] Specifically, the scraper 27 adopts an elastic plate, and two inclined scrapers 27 are distributed in an eight-shaped manner at the lower ends of both sides of the shell 7. The upper ends of the scrapers 27 are connected to the shell 7. The lower ends of the scrapers 27 contact the first sealing surface 12 of the sealing ring as the gate plate descends, and the first sealing surface 12 is cleaned. It can scrape off the particles in the medium deposited or attached to the first sealing surface 12, thereby extending the service life of the gate valve.

[0052] Optionally, when the valve plate 6 is in an open state, the lower end of the scraper 27 is above the first sealing surface 12, and when the valve plate 6 is in a closed state, the scraper 27 is in the lower chamber 4 and on both sides of the lifting component.

[0053] Specifically, when the valve plate 6 is in the open state, the lower end of the scraper 27 overlaps the top of the first sealing surface 12 and is on the sealing ring 14 but does not contact the first sealing surface 12. At this time, the scraper 27 may just not undergo elastic deformation and form an acute angle with the first sealing surface 12. As the valve plate 6 is closed, the scraper 27 moves downward with the valve plate 6, and the lower end of the scraper 27 moves to the first sealing surface 12 and scrapes and cleans the first sealing surface 12. During the scraping process, the scraper 27 is in an elastic deformation state until the valve plate 6 is in the closed state, when the scraper 27 enters the lower chamber 4, at which time the scraper 27 may be in an elastic deformation state.

[0054] Optionally, a first tapered surface 28 is provided on the outer periphery of the first sealing surface 12 , and when the valve plate 6 is opened, the lower end of the scraper 27 is located on the first tapered surface 28 .

[0055] Specifically, when the valve plate 6 is in the open state, the lower end of the scraper 27 is placed on the first tapered surface 28 of the sealing ring 14 , and the first tapered surface 28 plays a transition and guiding role for the elastic deformation of the scraper 27 .

[0056] In this embodiment, a second tapered surface 29 is provided on the outer periphery of the second sealing surface 13 at the ends of the two sealing blocks 10 that are away from each other. The second tapered surface 29 can play a transition and guiding role when the sealing block 10 moves outward to push the brush or elastic rubber ring or connecting arm 26.

[0057] Optionally, the actuator includes a valve stem 30, a valve frame 31 and a handwheel 32, the valve frame 31 is arranged above the valve cover 5, the handwheel 32 is rotatably arranged above the valve frame 31, the lower end of the valve stem 30 is rotatably connected to the valve plate 6, and the upper end of the valve stem 30 cooperates with the internal thread of the handwheel 32 through an external thread.

[0058] Specifically, for the actuator of the gate valve, the hand wheel 32 can cooperate with the thread of the valve stem 30 to drive the valve stem 30 to rise and fall, thereby driving the valve plate 6 to rise and fall, thereby realizing the opening and closing of the valve plate 6. At the same time, the settings of the valve cover 5, the valve frame 31, and the sealing packing and other structures can be arranged according to actual needs.

[0059] In this embodiment, due to the setting of the pressure sensor 15, a through hole can be set in the valve stem 30, and the cable of the pressure sensor 15 can be led upward through the through hole and connected to the pressure display component 16. The pressure display component 16 is set on the hand wheel 32 for easy observation.

[0060] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A gate valve, characterized in that: include: A valve body, wherein a valve cavity is disposed in the valve body, flow channels are disposed on both sides of the valve cavity, an upper chamber and a lower chamber are disposed above and below the valve cavity respectively, and a first sealing surface is disposed on an end surface of the flow channel close to the valve cavity; A valve cover, which is detachably connected to the top of the valve body and is used to block the upper chamber; A valve plate, the valve plate is movably arranged in the valve cavity, the valve plate includes a shell, a first slide groove with a bottom opening is arranged inside the shell, second slide grooves are arranged on both sides of the first slide groove, a wedge block which is gradually contracted from bottom to top is movably arranged in the first slide groove, the wedge block is connected to the shell through a first elastic component, a sealing block is slidably arranged in each of the second slide grooves, the sealing block is connected to the shell through a second elastic component, the two sealing blocks are matched with the wedge surfaces on both sides of the wedge block on the sides close to each other, and the two sealing blocks are provided with a second sealing surface matched with the first sealing surface on the sides away from each other; A lifting component, the lifting component is arranged in the middle of the lower chamber, and the lifting component is used to push the wedge block upward, so that the second sealing surface is pressed against the first sealing surface, and the first elastic component and the second elastic component are compressed; An actuator, which is arranged on the upper part of the valve body and connected to the valve plate, and is used to drive the valve plate to rise and fall; A pressure detection module, wherein the pressure detection module is used to detect the pressure between the wedge block and the sealing block.

2. The gate valve according to claim 1, characterized in that: A sealing ring is respectively provided at the end portions of the two flow channels close to each other, and the end surfaces of the two sealing rings close to each other respectively form the first sealing surfaces, and the first sealing surfaces are inclined so that the two first sealing surfaces form a V-shaped arrangement, and the axes of the two second slide grooves form an angle so that the two second sealing surfaces also form a V-shaped arrangement.

3. The gate valve according to claim 1, characterized in that: The pressure detection module includes a pressure sensor and a pressure display component. The pressure sensor is arranged on the wedge surface of the wedge block. The pressure display component is electrically connected to the pressure sensor and is arranged on the actuator.

4. The gate valve according to claim 1, characterized in that: The first elastic component is arranged between the upper end of the wedge block and the upper wall of the first slide groove, a lifting column is arranged in the bottom opening of the first slide groove, and a guide end which tapers from top to bottom is arranged at the lower end of the lifting column, and the lifting component includes a lifting seat, and a guide groove which matches with the guide end is arranged at the top of the lifting seat.

5. The gate valve according to claim 1, characterized in that: The upper side wall and the lower side wall of the second slide groove are respectively provided with elastic grooves, and the upper end and the lower end of the sealing block are respectively provided with sliding blocks, which are slidably arranged in the elastic groove and connected to the groove wall of the elastic groove through the second elastic component.

6. The gate valve according to claim 1, characterized in that: An accommodating groove is arranged on the chute wall at the ends away from each other of the two second chute, and a deformable protective component is arranged in the accommodating groove. When the valve plate is in an open state, the second sealing surface is in the first chute, and the protective component covers the second sealing surface. When the valve plate is in a closed state, the second sealing surface extends out of the second chute and the protective component is embedded in the accommodating groove.

7. The gate valve according to claim 1, characterized in that: A scraper is respectively arranged on both sides of the lower end of the shell, and the scrapers are arranged obliquely so that the two scrapers form an eight-shaped arrangement. The lower ends of the scrapers are used to elastically contact the first sealing surface to clean the first sealing surface.

8. The gate valve according to claim 7, characterized in that: When the valve plate is in an open state, the lower end of the scraper is located above the first sealing surface. When the valve plate is in a closed state, the scraper is located in the lower chamber and on both sides of the lifting component.

9. The gate valve according to claim 8, characterized in that: A first tapered surface is disposed on the outer periphery of the first sealing surface. When the valve plate is opened, the lower end of the scraper is located on the first tapered surface.

10. The gate valve according to claim 1, characterized in that: The actuator includes a valve stem, a valve frame and a handwheel, wherein the valve frame is arranged above the valve cover, the handwheel is rotatably arranged above the valve frame, the lower end of the valve stem is rotatably connected to the valve plate, and the upper end of the valve stem cooperates with the internal thread of the handwheel via an external thread.

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