High-temperature-resistant sealing gasket and gate valve

Abstract

The utility model discloses a high-temperature-resistant sealing gasket and a gate valve, and belongs to the technical field of gate valves. The mounting ring and the sealing ring are coaxially arranged at an interval, the elastic assembly is arranged between the mounting ring and the sealing ring, the sealing assembly is also arranged between the sealing ring and the mounting ring, and the sealing assembly is arranged around the sealing ring and the mounting ring. According to the high-temperature-resistant sealing gasket, it is guaranteed that the sealing effect between the sealing ring and the sealing face of equipment is good, the elastic assembly can guarantee the pressing force between the sealing ring and the sealing face of the equipment all the time, the problem that sealing is not tight after the sealing gasket is used for a period of time is solved, and the high-temperature-resistant sealing gasket can be directly applied to the high-temperature environment and is long in service life and good in sealing effect; according to the gate valve, high-temperature media can be directly conveyed, the sealing effect between the valve plate and the valve body is good, work is stable, the problem that high-temperature media cannot be conveyed through an existing gate valve is fundamentally solved, the problem that leakage is likely to happen between the valve plate and the valve body after the gate valve is used for a period of time is solved, and the maintenance frequency of the gate valve is reduced.

Description

Technical Field

[0001] A high-temperature resistant gasket and a knife gate valve belong to the technical field of knife gate valves. Background Art

[0002] A knife gate valve is a valve that realizes the opening or closing of the cut-off flow through a movable valve plate. A knife gate valve usually includes a valve plate and a valve body. An opening for the valve plate to pass through is provided on the valve body. A closing part and a conducting part are provided on the valve plate. The valve plate moves within the opening. When the closing part of the valve plate aligns with the flow channel of the valve body, the flow channel of the valve body is closed at this time, thereby realizing the cut-off of the medium flow. When the conducting part of the valve plate aligns with the flow channel of the valve body, the flow channel of the valve body is opened at this time, and thus the conduction of the medium flow is realized.

[0003] The seal between the valve plate and the valve body of a knife gate valve is one of the important factors affecting the performance of the knife gate valve. Currently, the seal between the valve plate and the valve body is usually achieved through a sealing ring, that is, sealing rings are provided on both sides of the valve plate, and the seal between the valve plate and both sides of the opening of the valve body is realized through the sealing rings to prevent the medium from leaking between the valve plate and the valve body. However, since the valve plate will move relative to the valve body during movement, the sealing ring will be worn. After being used for a period of time, leakage will inevitably occur between the valve plate and the valve body, which leads to the need for frequent replacement of the sealing ring, affecting the use of the knife gate valve. Secondly, when the knife gate valve is used in a harsh working environment, such as when transporting high-temperature media, this further increases the wear of the sealing ring. Content of the Utility Model

[0004] The technical problem to be solved by the present utility model is: to overcome the deficiencies of the prior art and provide a high-temperature resistant gasket and a knife gate valve with a long service life and capable of achieving stable sealing in a high-temperature environment.

[0005] The technical solution adopted by the present utility model to solve its technical problem is: The high-temperature resistant gasket includes a mounting ring, a sealing ring, an elastic component, and a sealing component. The mounting ring and the sealing ring are coaxial and spaced apart. The elastic component is arranged between the mounting ring and the sealing ring. The sealing component is also arranged between the sealing ring and the mounting ring. The sealing component surrounds the sealing ring and the mounting ring.

[0006] Further, the elastic component includes a sealing spring, and a plurality of sealing springs are arranged at intervals around the sealing ring.

[0007] Further, the sealing component is a bellows, and both ends of the bellows are fixedly connected to the mounting ring and the sealing ring respectively. The elastic component is arranged inside the bellows.

[0008] Further, a limiting component is also included, and the limiting component is arranged between the mounting ring and the sealing ring.

[0009] Further, the limiting component includes limiting columns. One end of each limiting column is fixedly connected to the mounting ring, and the other end is spaced from the sealing ring. A plurality of limiting columns are arranged around the sealing ring at intervals.

[0010] A flap valve includes a valve body, a valve plate, and the above-mentioned high-temperature resistant gasket. An opening for the valve plate to pass through is provided on the valve body. The valve plate is provided with a blocking portion and a conducting portion. High-temperature resistant gaskets are provided on both sides of the blocking portion and both sides of the conducting portion. The mounting ring of the high-temperature resistant gasket is fixedly connected to the valve plate. The valve plate is slidably connected to the opening, and the blocking portion or the conducting portion is alternately communicated with the flow channel of the valve body.

[0011] Further, the valve body includes a movable docking cylinder and a fixed docking cylinder. The movable docking cylinder and the fixed docking cylinder are spaced apart, and the opening is formed between the movable docking cylinder and the fixed docking cylinder. The movable docking cylinder is connected with a pressing device for pushing it to move in a direction close to or away from the valve plate.

[0012] Further, the movable docking cylinder includes a fixed section, a movable section, and a flexible connection cylinder. The movable section is arranged between the fixed section and the valve plate, the flexible connection cylinder is arranged between the movable section and the fixed section, and the pressing device is connected to the movable section.

[0013] Further, the pressing device includes a driving device and pressing screws. A plurality of pressing screws are arranged around the movable docking cylinder at intervals. Each pressing screw is arranged along the axial direction of the movable docking cylinder. Each pressing screw is threadedly connected to the movable docking cylinder, and the driving device is connected to each pressing screw at the same time.

[0014] Further, a pushing device is further included. The pushing device is connected to the valve plate and pushes the valve plate to move.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] The mounting ring of the present high-temperature resistant gasket is used for installation, and the sealing ring is used to cooperate with the sealing surface of the equipment to achieve sealing. The sealing component can realize the sealing between the mounting ring and the sealing ring, avoiding leakage between the mounting ring and the sealing ring. The elastic component pushes the sealing ring to press the sealing surface of the equipment, ensuring good sealing effect between the sealing ring and the sealing surface of the equipment. Moreover, the elastic component can always ensure the pressing force between the sealing ring and the sealing surface of the equipment, avoiding the problem of poor sealing after using for a period of time, and it can be directly applied in a high-temperature environment, with a long service life and good sealing effect.

[0017] The gate valve can directly realize the conveyance of high-temperature media, and the sealing effect between the valve plate and the valve body is good and the operation is stable, which fundamentally solves the problem that the existing gate valve cannot realize the conveyance of high-temperature media, and solves the problem that leakage is easy to occur between the valve plate and the valve body after a period of use, thereby reducing the maintenance frequency of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main cross-section of the high temperature resistant sealing gasket;

[0019] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0020] Figure 3 Schematic diagram of the gate valve in Example 1;

[0021] Figure 4 This is a three-dimensional schematic diagram of the gate valve in Example 1 from another perspective;

[0022] Figure 5 This is a schematic cross-sectional view of the main view of the gate valve in Example 1;

[0023] Figure 6 for Figure 5 A partial enlarged view of point B in the middle;

[0024] Figure 7 This is a three-dimensional schematic diagram of the gate valve in Example 2 with the outer cover removed;

[0025] Figure 8 This is a schematic front sectional view of the gate valve in Example 2.

[0026] In the figure: 1. Sealing ring; 2. Mounting ring; 3. Limiting column; 4. Sealing assembly; 5. Sealing spring; 6. Main body; 7. Movable docking tube; 8. Push rod; 9. Valve plate; 10. High temperature resistant sealing gasket; 11. Valve plate pushing motor; 12. Valve plate pushing gear; 13. Connecting piece; 14. Connecting rod; 15. Support seat; 16. Fixed docking tube; 17. Clamping motor; 18. Clamping screw; 19. Flexible connecting tube; 20. Fixed frame; 21. Movable frame; 22. Screw sleeve; 23. Clamping gear; 24. Clamping gear ring; 25. Mounting seat; 26. Translation gear; 27. Drive shaft; 28. Translation rack; 29. Height limiting wheel; 30. Height limiting guide rail; 31. Axial limiting wheel; 32. Axial limiting guide rail. DETAILED DESCRIPTION

[0027] The following further describes the present utility model in conjunction with specific embodiments. However, those skilled in the art should understand that the detailed description given here in conjunction with the accompanying drawings is for better explanation. The structure of the present utility model necessarily goes beyond these limited embodiments. For some equivalent replacement schemes or common means, no detailed description will be given herein, but they still fall within the protection scope of this application.

[0028] Figures 1 to 8 is the best embodiment of the present utility model. The following further describes the present utility model in conjunction with the attached Figures 1 to 8 drawings.

[0029] A high-temperature resistant gasket includes an installation ring 2, a sealing ring 1, an elastic component, and a sealing component 4. The installation ring 2 and the sealing ring 1 are coaxially and spaced apart. The elastic component is arranged between the installation ring 2 and the sealing ring 1, and the sealing component 4 is also arranged between the sealing ring 1 and the installation ring 2. The sealing component 4 surrounds the sealing ring 1 and the installation ring 2. The installation ring 2 of the high-temperature resistant gasket 10 is used for installation, and the sealing ring 1 is used to cooperate with the sealing surface of the equipment to achieve sealing. The sealing component 4 can achieve the sealing between the installation ring 2 and the sealing ring 1, avoiding leakage between the installation ring 2 and the sealing ring 1. The elastic component pushes the sealing ring 1 to press tightly against the sealing surface of the equipment, ensuring good sealing effect between the sealing ring 1 and the sealing surface of the equipment. Moreover, the elastic component can always ensure the pressing force between the sealing ring 1 and the sealing surface of the equipment, avoiding the problem of poor sealing after using for a period of time. And it can be directly applied in a high-temperature environment, with a long service life and good sealing effect.

[0030] Embodiment 1

[0031] As Figures 1 - 2 shown: Both the installation ring 2 and the sealing ring 1 are circular rings, and the inner diameters and outer diameters of the installation ring 2 and the sealing ring 1 are respectively equal. The installation ring 2 and the sealing ring 1 are coaxially arranged, and a space for accommodating the elastic component is formed between the installation ring 2 and the sealing ring 1.

[0032] The high-temperature resistant gasket 10 further includes a limiting component. The limiting component is arranged between the installation ring 2 and the sealing ring 1, and the limiting component can limit the position between the installation ring 2 and the sealing ring 1, avoiding excessive movement of the sealing ring 1 towards the installation ring 2 and causing damage to the elastic component and the sealing component 4.

[0033] The limiting component includes a limiting column 3. The limiting column 3 is cylindrical, arranged parallel to the axis of the sealing ring 1. The limiting column 3 is arranged between the installation ring 2 and the sealing ring 1. One end of the limiting column 3 is fixedly connected to the installation ring 2, and the other end is spaced from the sealing ring 1. A number of limiting columns 3 are evenly distributed around the sealing ring 1, which can ensure the minimum interval between the installation ring 2 and the sealing ring 1 to protect the elastic component and the sealing component 4.

[0034] The elastic component includes a sealing spring 5, which is arranged between the mounting ring 2 and the sealing ring 1. A number of sealing springs 5 are evenly distributed around the sealing ring 1 at intervals. In this embodiment, the sealing springs 5 correspond to the limiting posts 3 one by one, and the lower parts of the sealing springs 5 are sleeved outside the corresponding limiting posts 3. When in the initial state, that is, when the sealing spring 5 is in its original length, the limiting post 3 is arranged at an interval from the sealing ring 1.

[0035] The sealing component 4 includes a corrugated pipe, which is coaxially arranged between the mounting ring 2 and the sealing ring 1. Both ends of the corrugated pipe are fixedly connected to the mounting ring 2 and the sealing ring 1 at the same time, so that it can not only seal between the mounting ring 2 and the sealing ring 1, but also enable relative movement between the sealing ring 1 and the mounting ring 2.

[0036] In this embodiment, the limiting posts 3 and the sealing springs 5 are both arranged inside the corrugated pipe.

[0037] The present utility model also provides a plug valve, which includes a valve body, a valve plate 9 and the above-mentioned high-temperature resistant gasket 10. An opening for the valve plate 9 to pass through is arranged on the valve body. A blocking part and a conducting part are arranged on the valve plate 9. High-temperature resistant gaskets 10 are arranged on both sides of the blocking part and both sides of the conducting part. The mounting ring 2 of the high-temperature resistant gasket 10 is fixedly connected to the valve plate 9. The valve plate 9 is slidably connected to the opening, and the blocking part or the conducting part is alternately communicated with the flow channel of the valve body. This plug valve can directly realize the transportation of high-temperature media, and has a good sealing effect between the valve plate 9 and the valve body, and stable operation. It fundamentally solves the problem that the existing plug valve cannot realize the transportation of high-temperature media, and solves the problem that leakage is likely to occur between the valve plate 9 and the valve body after using for a period of time, and reduces the maintenance frequency of the plug valve.

[0038] Specifically, as Figures 3 - 6 shown: The plug valve further includes a main body 6 and a pressing device. The valve body includes a movable docking cylinder 7 and a fixed docking cylinder 16. The movable docking cylinder 7 is slidably installed on the main body 6, and the fixed docking cylinder 16 is fixedly installed on the main body 6. The fixed docking cylinder 16 and the movable docking cylinder 7 are arranged at intervals, and an opening for the valve plate 9 to be inserted is formed between the fixed docking cylinder 16 and the movable docking cylinder 7. The pressing device is connected to the movable docking cylinder 7 and pushes the movable docking cylinder 7 to move in the direction close to or away from the valve plate 9. When the valve plate 9 needs to move, the movable docking cylinder 7 moves in the direction away from the valve plate 9 to facilitate the movement of the valve plate 9 and can reduce the wear of the high-temperature resistant gasket 10. After the valve plate 9 moves in place, the pressing device drives the movable docking cylinder 7 to press the valve plate 9 again, so that the sealing between the movable docking cylinder 7 and the valve plate 9 and between the fixed docking cylinder 16 and the valve plate 9 is reliable.

[0039] The movable docking cylinder 7 includes a fixed section, a movable section, and a flexible connection cylinder 19. The movable section is arranged between the fixed section and the valve plate 9, and the fixed section and the movable section are coaxial and spaced apart, reserving sufficient movement space for the movable section. The flexible connection cylinder 19 is arranged between the fixed section and the movable section, and both ends of the flexible connection cylinder 19 are fixedly connected to the fixed section and the movable section respectively, so as to not only ensure the sealed connection between the fixed section and the movable section, but also allow the movable section to perform axial movement relative to the fixed section. In this embodiment, the flexible connection cylinder 19 is a corrugated pipe.

[0040] The pressing device is connected to the movable section and pushes the movable section to move in a direction close to or away from the valve plate 9. Flange plates are provided at one end of the fixed section away from the flexible connection cylinder 19 and at one end of the fixed docking cylinder 16 away from the valve plate 9 to facilitate the docking with the pipeline.

[0041] Furthermore, support seats 15 are arranged on both sides of the bottom of the movable section. Support wheels are rotatably installed at the bottom of the support seats 15, and the support wheels support on the main body 6. The support of the movable section can be realized through the support seats 15 and the support wheels, ensuring that the movable section is more stable during movement.

[0042] The fixed docking cylinder 16 is fixedly installed on the main body 6 through a fixing frame 20. A movable frame 21 is fixedly installed on the movable section, and the support seats 15 are installed at the bottom of the movable frame 21. The pressing device is arranged between the fixing frame 20 and the movable frame 21.

[0043] The pressing device includes a driving device and a pressing screw 18. The pressing screw 18 is arranged outside the movable section, and a plurality of pressing screws 18 are arranged at intervals around the movable section. In this embodiment, three pressing screws 18 are evenly distributed at intervals around the movable section, and one of the pressing screws 18 is located directly above the movable section. Screw sleeves 22 are fixedly installed on both the fixing frame 20 and the movable frame 21. Both ends of the pressing screw 18 are threadedly connected to the two screw sleeves 22 respectively, and the thread directions at both ends of the pressing screw 18 are opposite. The driving device is connected to each pressing screw 18 at the same time, and then the movable frame 21 is pushed through the pressing screw 18, and then the movable section is driven through the movable frame 21.

[0044] In this embodiment, the valve plate 9 is fan-shaped. The top of the valve plate 9 is rotatably connected to the pressing screw 18 located at the top. The closing part and the conducting part on the valve plate 9 are arranged at intervals around the rotation axis of the valve plate 9.

[0045] This plug valve further includes a pushing device. The pushing device is connected to the valve plate 9 and pushes the valve plate 9 to move, so as to realize the alternating alignment of the conducting part and the closing part with the flow channel of the valve body.

[0046] In this embodiment, the valve plate 9 and the pressing screw 18 at the top can rotate relative to each other and are axially fixed relative to each other. That is, when the pressing screw 18 rotates, since the fixing bracket 20 is fixed, the pressing screw 18 will drive the valve plate 9 to move, and at the same time, the movable bracket 21 will also move relative to the valve plate 9, so that at this time, both the valve plate 9 and the fixed docking cylinder 16 and the movable section are loosened, protecting the high-temperature gaskets 10 on both sides of the valve plate 9.

[0047] Grooved pulleys are coaxially arranged on the pressing screws 18 on both sides, and both sides of the valve plate 9 extend into the grooved pulleys, thus ensuring the balanced driving force on the valve plate 9.

[0048] The pushing device includes a valve plate pushing motor 11 and a valve plate pushing gear 12. The valve plate pushing motor 11 is located on one side of the main body 6, and the valve plate pushing gear 12 is coaxially installed on the output shaft of the valve plate pushing motor 11. Teeth meshing with the valve plate pushing gear 12 are provided on the outer edge of the valve plate 9, that is, the valve plate 9 is a sector gear. The valve plate pushing motor 11 drives the valve plate pushing gear 12 to rotate, thereby realizing the movement of the valve plate 9.

[0049] In this embodiment, the thickness of the valve plate pushing gear 12 is greater than the thickness of the valve plate 9, so that when the valve plate 9 moves axially along the pressing screw 18, it can always maintain a meshing state with the valve plate pushing gear 12.

[0050] The driving device includes a pressing motor 17, a dial rod 8, a connecting rod 14 and a connecting piece 13. Dial rods 8 are fixedly installed at the ends of the pressing screws 18 on both sides, and the dial rods 8 are arranged radially along the corresponding pressing screws 18. The middle of the connecting piece 13 is fixedly connected to the end of the middle pressing screw 18. Connecting rods 14 are provided between each dial rod 8 and the corresponding side of the connecting piece 13. One end of the connecting rod 14 is hinged to the other end of the corresponding dial rod 8, and the other end of the connecting rod 14 is hinged to the corresponding side of the connecting piece 13. The pressing motor 17 is located on one side of the main body 6, and the output shaft of the pressing motor 17 is threadedly connected to any one of the pressing screws 18. The pressing motor 17 drives the pressing screw 18 connected to it to rotate, and this pressing screw 18 drives the corresponding dial rod 8 to move. The dial rod 8 drives the connecting piece 13 to move through the corresponding connecting rod 14. At this time, the pressing screw 18 connected to the connecting piece 13 moves synchronously. At the same time, the connecting piece 13 drives another dial rod 8 to move through another connecting rod 14, thereby driving another pressing screw 18 to rotate, so that the three pressing screws 18 achieve synchronous movement.

[0051] Embodiment 2

[0052] As Figures 7 - 8As shown: The difference between Example 2 and Example 1 is that the valve plate 9 reciprocates horizontally. On both sides of the top of the main body 6, height limit guide rails 30 are provided. There are two height limit guide rails 30 arranged side by side and at intervals. The height limit guide rails 30 are in a trough shape with the opening facing inwards. On both sides of the top of the valve plate 9, height limit wheels 29 are rotatably installed. On each side of the valve plate 9, a number of height limit wheels 29 are arranged side by side and at intervals. The height limit wheels 29 are rotatably arranged on the corresponding height limit guide rails 30, thereby realizing the limit of the valve plate 9 in the height direction. An annular boss is provided around the inner end face of each height limit wheel 29, and the annular boss is limited inside the corresponding height limit guide rail 30, thereby limiting the upper part of the valve plate 9 in the axial direction of the fixed docking cylinder 16.

[0053] In this embodiment, the pushing device includes a valve plate pushing motor 11, a translation gear 26, and a translation rack 28. The translation gear 26 is rotatably installed on the main body 6 through a transmission shaft 27. The output shaft of the valve plate pushing motor 11 is connected to the transmission shaft 27 and drives it to rotate, thereby driving the translation gear 26 to rotate. The translation rack 28 is arranged under the translation gear 26, and the translation rack 28 is fixedly connected to the valve plate 9. The translation rack 28 is horizontally arranged and meshes with the translation gear 26. When the translation gear 26 rotates, it can drive the valve plate 9 to translate through the translation rack 28.

[0054] A translation frame is slidably installed on the main body 6. Limiting plates are provided on both sides of the bottom of the translation frame. Long holes are provided on each limiting plate. The long holes are arranged along the axial direction of the fixed docking cylinder 16. The translation rack 28 is fixedly connected to the top of the translation frame. The upper part of the valve plate 9 extends between the two limiting plates. Limiting rollers extending into the two long holes are provided on the valve plate 9, so that the valve plate 9 moves horizontally with the translation frame and can have a relative movement along the axial direction of the fixed docking cylinder 16 with the translation frame.

[0055] Axial limit guide rails 32 in a trough shape are provided at both the bottom and the top of the valve plate 9. Axial limit wheels 31 are rotatably installed at both the top and the bottom of the movable frame 21. The axis of the axial limit wheel 31 is vertically arranged. A number of axial limit wheels 31 are arranged along the translation direction of the valve plate 9 at both the top and the bottom of the movable frame 21. The axial limit wheels 31 are rotatably arranged in the corresponding axial limit guide rails 32, thereby limiting the lower part of the valve plate 9 in the axial direction of the fixed docking cylinder 16 and making the movement of the valve plate 9 more stable.

[0056] Furthermore, the diameter of the axial limit wheel 31 is smaller than the width of the axial limit guide rail 32, that is, the axial limit wheel 31 moves in the axial limit guide rail 32. An elastic telescopic rod is fixedly installed on the movable frame 21. A pushing roller is rotatably installed at the end of the elastic telescopic rod, and the pushing roller presses against the valve plate 9.

[0057] In this embodiment, the pressing screw 18 is only connected to the movable frame 21. When the pressing screw 18 drives the movable frame 21 to move away from the valve plate 9, at this time, the spring telescopic rod pushes the valve plate 9 away from the movable frame 21 by pushing the roller. At this time, looseness occurs both between the valve plate 9 and the movable section and between the valve plate 9 and the fixed docking cylinder 16.

[0058] In this embodiment, a plurality of pressing screws 18 are arranged at intervals around the movable section. The pressing screws 18 are rotatably installed on the main body 6, and the pressing screws 18 will not perform axial movement.

[0059] The driving device includes a pressing gear 23, a pressing gear ring 24, and a pressing motor 17. A mounting seat 25 is fixedly installed on the outer wall of the fixed section of the movable docking cylinder 7. A plurality of mounting seats 25 are evenly distributed at intervals around the fixed section. A grooved pulley is rotatably installed on each mounting seat 25. The pressing gear ring 24 is sleeved outside each mounting seat 25, and the pressing gear ring 24 is rotatably installed on each mounting seat 25 through each grooved pulley, thus realizing the installation of the pressing gear ring 24. A pressing gear 23 is fixedly arranged on each pressing screw 18, and each pressing gear 23 is simultaneously meshed with the pressing gear ring 24. A driving gear meshed with the pressing gear ring 24 is arranged on the output shaft of the pressing motor 17.

[0060] The pressing motor 17 drives the pressing gear ring 24 to rotate, and further synchronously drives each pressing gear 23 to rotate, so that each pressing screw 18 rotates synchronously.

[0061] The above is only a preferred embodiment of the present invention, and it is not a limitation to the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A high-temperature resistant gasket, characterized in that: It includes an installation ring (2), a sealing ring (1), an elastic component, and a sealing component (4). The installation ring (2) and the sealing ring (1) are coaxial and spaced apart. The elastic component is arranged between the installation ring (2) and the sealing ring (1). The sealing component (4) is also arranged between the sealing ring (1) and the installation ring (2), and the sealing component (4) surrounds the sealing ring (1) and the installation ring (2).

2. The high-temperature resistant gasket according to claim 1, wherein: The elastic component includes a sealing spring (5), and a number of sealing springs (5) are arranged at intervals around the sealing ring (1).

3. The high-temperature resistant gasket according to claim 1, wherein: The sealing component (4) is a bellows. The two ends of the bellows are respectively fixedly connected to the installation ring (2) and the sealing ring (1), and the elastic component is arranged inside the bellows.

4. The high-temperature resistant gasket according to claim 1, wherein: It further includes a limiting component, and the limiting component is arranged between the installation ring (2) and the sealing ring (1).

5. The high-temperature resistant gasket according to claim 4, characterized in that: The limiting component includes a limiting post (3). One end of the limiting post (3) is fixedly connected to the installation ring (2), and there is a space between the other end and the sealing ring (1). A number of limiting posts (3) are arranged at intervals around the sealing ring (1).

6. A flap valve, characterized in that: It includes a valve body, a valve plate (9), and a high-temperature resistant gasket (10) according to any one of claims 1-5. An opening for the valve plate (9) to pass through is provided on the valve body. A blocking part and a conducting part are provided on the valve plate (9). High-temperature resistant gaskets (10) are arranged on both sides of the blocking part and both sides of the conducting part. The installation ring (2) of the high-temperature resistant gasket (10) is fixedly connected to the valve plate (9). The valve plate (9) is slidably connected to the opening, and the blocking part or the conducting part is alternately communicated with the flow channel of the valve body.

7. The plug valve according to claim 6, wherein: The valve body includes a movable docking cylinder (7) and a fixed docking cylinder (16). The movable docking cylinder (7) and the fixed docking cylinder (16) are spaced apart, and the opening is formed between the movable docking cylinder (7) and the fixed docking cylinder (16). The movable docking cylinder (7) is connected with a pressing device that pushes it to move in a direction close to or away from the valve plate (9).

8. The plug valve according to claim 7, wherein: The movable docking cylinder (7) includes a fixed section, a movable section, and a flexible connection cylinder (19). The movable section is arranged between the fixed section and the valve plate (9), and the flexible connection cylinder (19) is arranged between the movable section and the fixed section. The pressing device is connected to the movable section.

9. The plug valve according to claim 7, wherein: The pressing device includes a driving device and a pressing screw (18). A number of pressing screws (18) are arranged at intervals around the movable docking cylinder (7). Each pressing screw (18) is arranged along the axial direction of the movable docking cylinder (7). Each pressing screw (18) is threadedly connected to the movable docking cylinder (7), and the driving device is connected to each pressing screw (18) at the same time.

10. The plug valve according to claim 6, wherein: It further includes a pushing device, and the pushing device is connected to the valve plate (9) and pushes the valve plate (9) to move.

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