High-temperature-resistant and high-pressure-resistant gate valve for supercritical power station

Abstract

The utility model relates to the field of high-pressure gate valves, and discloses a high-temperature and high-pressure resistant gate valve for a supercritical power station, which comprises a valve body, connecting structures are arranged at the centers of two side walls of the valve body, an upper plate is arranged at the center of the upper end face of the valve body, and flow cavities are arranged at the lower part of the center of one side and the upper part of the center of the other side in the valve body. Pressure relief structures are arranged in the valve body at the centers of the upper end faces of the two flowing cavities, a sealing gate valve rod is arranged on the upper portion of the center in the valve body, and a protection structure is arranged on the outer side wall of the sealing gate valve rod. According to the pressure relief valve, the pressure relief hole, the pressure discharge hole and the combination of the telescopic rod and the compression spring are arranged, so that the function of automatically relieving pressure when the pressure in the valve body is too high is achieved, the mechanism can effectively prevent equipment damage or safety accidents caused by too high pressure, meanwhile, the pressure relief hole is automatically closed after the pressure returns to normal, and the safety of the valve body is improved. The stable operation of the system is ensured, and the safety and reliability of the valve are improved.

Description

Technical Field

[0001] The utility model relates to the field of high-pressure gate valves, in particular to a high-temperature and high-pressure gate valve for supercritical power stations. Background Art

[0002] High-temperature and high-pressure gate valves for supercritical power plants are one of the key equipment in thermal power plants. They are mainly used to effectively cut off or open high-temperature and high-pressure steam or water media. As thermal power generating units develop towards high parameters and large capacities, the requirements for valves are becoming higher and higher, including higher pressure bearing performance, sealing performance, action performance, service life and maintenance cycle.

[0003] Since traditional high-temperature and high-pressure gate valves used in supercritical power plants do not have an automatic pressure relief mechanism, if the pressure inside the valve body increases abnormally, it may cause equipment damage or even safety accidents. The sealing performance is insufficient in high-temperature and high-pressure environments, especially when the valve is frequently opened and closed or the temperature and pressure fluctuate greatly. Therefore, those skilled in the art provide a high-temperature and high-pressure gate valve for supercritical power plants to solve the problems raised in the above background technology. Utility Model Content

[0004] The present utility model aims to address the shortcomings of the prior art by proposing a high-temperature, high-pressure gate valve for supercritical power plants. By providing a pressure relief hole and a pressure drain hole, along with a combination of a telescopic rod and a compression spring, the valve automatically releases pressure when the internal pressure inside the valve body is excessively high. This mechanism effectively prevents equipment damage or safety accidents caused by excessive pressure. The pressure relief hole automatically closes when the pressure returns to normal, ensuring stable system operation and enhancing the valve's safety and reliability. The provision of a wear-resistant layer, a protective layer, and an elastic sealing layer not only enhances the wear and corrosion resistance of the sealing gate valve stem but also ensures the valve's sealing effectiveness under high-temperature and high-pressure environments. The elastic sealing layer provides excellent sealing performance when the valve is closed, adapting to extreme operating conditions and ensuring stable operation of the power plant system. The inclined design of the flow chamber guides fluid smoothly through the valve body, reducing turbulence and resistance, and improving fluid flow efficiency. This not only optimizes fluid dynamics, but also potentially reduces energy consumption and extends the valve's service life. In supercritical power plants, where fluid control requirements are extremely high, this design helps improve overall system performance and efficiency.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-temperature and high-pressure gate valve for a supercritical power station, comprising a valve body, a connecting structure is provided at the center of both side walls of the valve body, an upper plate is provided at the center of the upper end surface of the valve body, a flow cavity is provided at the lower center of one side of the valve body and at the upper center of the other side, a pressure relief structure is provided inside the valve body at the center of the upper end surfaces of the two flow cavities, a sealing gate valve rod is provided at the upper center of the valve body, a protective structure is provided on the outer side wall of the sealing gate valve rod, a rotating rod is fixedly connected at the center of the upper end surface of the sealing gate valve rod, a stabilizing disk is provided on the outer side wall of the rotating rod on the upper end surface of the upper plate, four supporting legs are arranged in a ring on the upper end surface of the stabilizing disk, a supporting disk is provided on the outer side wall of the rotating rod on the upper end surface of the supporting legs, and a rotating disk is fixedly connected at the center of the outer side wall of the rotating rod;

[0006] The above technical solution, through the provision of pressure relief holes and pressure exhaust holes, as well as the combination of a telescopic rod and a compression spring, realizes the function of automatic pressure relief when the internal pressure of the valve body is too high. This mechanism can effectively prevent equipment damage or safety accidents caused by excessive pressure. At the same time, the pressure relief hole is automatically closed after the pressure returns to normal, ensuring the stable operation of the system and improving the safety and reliability of the valve. By providing a wear-resistant layer, a protective layer and an elastic sealing layer, this design not only improves the wear resistance and corrosion resistance of the sealing gate valve stem, but also ensures the sealing effect of the valve in high temperature and high pressure environments. The design of the elastic sealing layer can provide good sealing performance when the valve is closed, adapting to extreme working conditions and ensuring the stable operation of the power station system. By designing the flow chamber to be inclined, the fluid can be guided smoothly through the valve body, reducing turbulence and resistance, and improving the flow efficiency of the fluid. This not only optimizes the fluid dynamic characteristics, but also may reduce energy consumption and extend the service life of the valve. In supercritical power plants, which have extremely high requirements for fluid control, it helps to improve the performance and efficiency of the overall system.

[0007] Furthermore, the two connecting structures include two flanges, eight bolts, a connecting pipe and a filter screen. The two flanges are arranged at the center of the two side walls of the valve body. The eight bolts are grouped into four groups. The two groups of bolts are arranged in a circular manner on one side wall of the two flanges. The two connecting pipes are respectively arranged on the two side walls of the valve body at the inner center of the two flanges. The two filters are respectively arranged at the inner center of the two connecting pipes.

[0008] Through the above technical solution, the flange is installed at the center of the two side walls of the valve body, and the valve body is tightly connected to the connecting pipe by bolts. The connecting pipe serves as a channel connecting the valve body and the external pipeline. When the fluid enters the valve body through the connecting pipe, the filter can filter impurities in the fluid. The combined connection method of the flange and the bolt is firm and reliable, and can withstand the huge pressure in the high temperature and high pressure environment of the supercritical power station, ensuring the tightness of the connection between the valve body and the external pipeline to prevent fluid leakage.

[0009] Furthermore, the two pressure relief structures include two pressure relief holes, four pressure discharge holes, four bottom plates, two telescopic rods, and two compression springs. The two pressure relief holes are respectively arranged at the upper center of the valve body and the inner center of the upper plate on both sides. The four pressure discharge holes are respectively grouped in twos, and the two groups of pressure discharge holes are respectively arranged vertically on the upper plate; at the center of the two side walls, the four bottom plates are respectively grouped in twos, and the two groups of bottom plates are respectively arranged vertically at the inner center of the two pressure relief holes. The two telescopic rods are respectively arranged between the two groups of bottom plates, and the two compression springs are respectively sleeved on the outer side walls of the two telescopic rods.

[0010] Through the above technical solution, when the pressure inside the valve body is too high, the pressure of the fluid acts on the bottom plate. Due to the excessive pressure, the bottom plate is pushed upward, and the telescopic rod is compressed at the same time. The compression spring is compressed. As the bottom plate moves upward, the pressure relief hole is opened, and the fluid enters the upper plate through the pressure relief hole, and then is discharged through the pressure relief holes arranged in the center of the two side walls of the upper plate, thereby reducing the pressure inside the valve body. When the pressure returns to normal, the elastic force of the compression spring pushes the bottom plate back to its original position and closes the pressure relief hole again.

[0011] Furthermore, the protective structure includes a wear-resistant layer, a protective layer and an elastic sealing layer, the protective layer is sleeved on the outer side wall of the sealing gate valve stem, the wear-resistant layer is sleeved on the outer side wall of the protective layer, and the elastic sealing layer is arranged at the center of the lower end surface of the sealing gate valve stem;

[0012] Through the above technical solution, during the use of the high-temperature and high-pressure gate valve, the sealing gate valve stem will continuously move up and down to control the opening and closing of the valve. The protective layer provides basic protection for the sealing gate valve stem. When the sealing gate valve stem rubs against the internal structure of the valve body or other components, the wear-resistant layer first bears the friction, reducing the wear of the internal protective layer and the sealing gate valve stem. When the sealing gate valve stem descends to close the valve, the elastic sealing layer contacts the valve body and undergoes elastic deformation under the action of pressure, fitting tightly to the valve body to achieve a good sealing effect. It can adapt to harsh working environments of high temperature and high pressure such as supercritical power stations, ensure that the valve can still work normally under extreme conditions, and provide protection for the stable operation of the power station system.

[0013] Furthermore, the two flow chambers are both arranged at an angle;

[0014] Through the above technical solution, when the fluid flows in the valve body, the flow direction of the fluid will change at a certain angle due to the inclined setting of the flow chamber. This inclined design can guide the fluid to pass through the valve body more smoothly, reduce the turbulence and resistance of the fluid inside the valve body, and improve the flow efficiency of the fluid.

[0015] Furthermore, the sealing gate valve stem and the two flow chambers are adapted to each other;

[0016] Through the above technical solution, when the sealing gate valve stem descends to close the valve, it can be accurately inserted into the flow cavity, tightly fit against the inner wall of the flow cavity, and prevent the fluid from passing through. When the sealing gate valve stem rises to open the valve, it separates from the flow cavity, allowing the fluid to pass through the flow cavity smoothly.

[0017] Furthermore, the valve body is made of high-strength steel;

[0018] Through the above technical solution, high-strength steel has high strength and hardness, and can withstand the huge pressure and impact force in the high temperature and high pressure environment of supercritical power plants. The valve body is made of high-strength steel, which can maintain structural stability under harsh working conditions and ensure the normal operation of the valve.

[0019] The utility model has the following beneficial effects:

[0020] 1. In the utility model, the high-temperature and high-pressure gate valve used in supercritical power stations realizes the function of automatic pressure relief when the pressure inside the valve body is too high by setting a pressure relief hole and a pressure discharge hole, as well as a combination of a telescopic rod and a compression spring. This mechanism can effectively prevent equipment damage or safety accidents caused by excessive pressure. At the same time, the pressure relief hole is automatically closed after the pressure returns to normal, ensuring the stable operation of the system and improving the safety and reliability of the valve.

[0021] 2. In the present invention, by setting a wear-resistant layer, a protective layer and an elastic sealing layer, this design not only improves the wear resistance and corrosion resistance of the sealing gate valve stem, but also ensures the sealing effect of the valve under high temperature and high pressure environment. The design of the elastic sealing layer can provide good sealing performance when the valve is closed, adapting to extreme working conditions, and ensuring the stable operation of the power station system is crucial.

[0022] 3. In the present invention, by designing the flow chamber to be inclined, the fluid can be guided to pass smoothly through the valve body, reducing turbulence and resistance, and improving the flow efficiency of the fluid. This not only optimizes the fluid dynamics characteristics, but also may reduce energy consumption and extend the service life of the valve. In an environment such as a supercritical power station that has extremely high requirements for fluid control, it helps to improve the performance and efficiency of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a three-dimensional diagram of a high-temperature and high-pressure gate valve for a supercritical power station proposed by the present invention;

[0024] Figure 2 This is a three-dimensional cross-sectional view of a high-temperature and high-pressure gate valve for a supercritical power station proposed by the present invention;

[0025] Figure 3 This is a front cross-sectional view of a high-temperature and high-pressure gate valve for a supercritical power station proposed by the present invention;

[0026] Figure 4 for Figure 3 Enlarged schematic diagram of point A in the middle.

[0027] Legend:

[0028] 1. Valve body 1; 2. Connection structure; 201. Flange; 202. Bolt; 203. Connecting pipe; 204. Filter; 3. Pressure relief structure; 301. Pressure relief hole; 302. Pressure relief hole; 303. Bottom plate; 304. Telescopic rod; 305. Compression spring; 4. Upper plate; 5. Flow chamber; 6. Sealing gate valve stem; 7. Protection structure; 701. Wear-resistant layer; 702. Protective layer; 703. Elastic sealing layer; 8. Rotating rod; 9. Stabilizing disk; 10. Support legs; 11. Support disk; 12. Rotating disk. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Reference Figure 1-4 , the utility model provides an embodiment: a high-temperature and high-pressure gate valve for a supercritical power station, including a valve body 1, a connecting structure 2 is provided at the center of both side walls of the valve body 1, an upper plate 4 is provided at the center of the upper end surface of the valve body 1, a flow cavity 5 is provided at the lower center of one side and the upper center of the other side inside the valve body 1, a pressure relief structure 3 is provided inside the valve body 1 at the center of the upper end surface of the two flow cavities 5, a sealing gate valve rod 6 is provided at the upper center of the valve body 1, a protective structure 7 is provided on the outer wall of the sealing gate valve rod 6, a rotating rod 8 is fixedly connected to the center of the upper end surface of the sealing gate valve rod 6, a stabilizing disk 9 is provided on the outer wall of the rotating rod 8 on the upper end surface of the upper plate 4, and four supporting legs 10 are arranged in a ring on the upper end surface of the stabilizing disk 9, a supporting disk 11 is provided on the outer wall of the rotating rod 8 on the upper end surface of the supporting leg 10, and a rotating disk 12 is fixedly connected to the upper center of the outer wall of the rotating rod 8.

[0031] The valve body 1 is connected to the external pipeline through the connecting structure 2 to ensure that the fluid can flow into and out of the valve body 1 smoothly. In the working environment of the supercritical power station, the fluid enters from the connecting structure 2 on one side of the valve body 1 and passes through one of the flow chambers 5. Due to the two flows, 5 are respectively located at the lower center of one side and the upper center of the other side inside the valve body 1, so that the fluid forms a specific flow path inside the valve body 1. When the sealing gate valve stem 6 is in different positions, the connection or isolation between the two flow chambers 5 can be controlled, thereby realizing the opening and closing function of the valve. When the internal pressure of the valve body 1 is too high, the pressure relief structure 3 begins to play a role. When the pressure exceeds the set value, the pressure relief is opened, and the fluid is discharged from the valve body 1 through the pressure relief, thereby reducing the internal pressure and protecting the safety of the valve and the entire system. The sealing gate valve stem 6 moves up and down by the rotation of the rotating rod 8. When When the sealing gate valve stem 6 descends, it is inserted between the two flow chambers 5, blocking the flow of fluid and achieving valve closure. When the sealing gate valve stem 6 rises, the two flow chambers 5 are reconnected, and the fluid can continue to flow, achieving valve opening. The protective structure 7 can protect the sealing gate valve stem 6 from damage in a high temperature and high pressure environment, ensuring its sealing performance and operational reliability. The stabilizing disk 9, support legs 10 and support disk 11 work together to provide stable support for the rotating rod 8. During the operation of the valve, the rotating rod 8 needs to withstand a certain torque and axial force. These components can prevent the rotating rod 8 from shaking or offsetting, ensuring precise control of the valve. The rotating disk 12 facilitates the operator to rotate the rotating rod 8. By rotating the rotating disk 12, the up and down movement of the sealing gate valve stem 6 can be easily controlled to achieve valve opening and closing.

[0032] Both flow chambers 5 are inclined. When the fluid flows in the valve body 1, the flow direction of the fluid will change at a certain angle due to the inclined setting of the flow chamber 5. This inclined design can guide the fluid to pass through the valve body 1 more smoothly, reduce the turbulence and resistance of the fluid inside the valve body 1, and improve the flow efficiency of the fluid. The sealing gate valve stem 6 and the two flow chambers 5 are adapted to each other. When the sealing gate valve stem 6 descends to close the valve, it can be accurately inserted into the flow chamber 5, fit tightly with the inner wall of the flow chamber, and prevent the fluid from passing through. When the sealing gate valve stem 6 rises to open the valve, it separates from the flow chamber 5, allowing the fluid to pass through the flow chamber smoothly. The valve body 1 is made of high-strength steel. High-strength steel has high strength and hardness and can withstand the huge pressure and impact force in the high temperature and high pressure environment of the supercritical power station. The valve body 1 is made of high-strength steel and can maintain structural stability under harsh working conditions to ensure the normal operation of the valve.

[0033] The two connecting structures 2 include two flanges 201, eight bolts 202, a connecting pipe 203 and a filter screen 204. The two flanges 201 are arranged at the center of the two side walls of the valve body 1. The eight bolts 202 are grouped into four groups. The two groups of bolts 202 are arranged in a ring shape on one side wall of the two flanges 201. The two connecting pipes 203 are respectively arranged on the two side walls of the valve body 1 at the inner center of the two flanges 201. The two filter screens 204 are respectively arranged at the inner center of the two connecting pipes 203. The flanges 201 are installed at the center of the two side walls of the valve body 1. The valve body 1 and the connecting pipes 203 are tightly connected by bolts 202. The connecting pipes 203 serve as a channel connecting the valve body 1 and the external pipeline. When the fluid enters the valve body 1 through the connecting pipes 203, the filter screen 204 can filter impurities in the fluid. The combined connection mode of the flanges 201 and the bolts 202 is firm and reliable, capable of withstanding the huge pressure in the high temperature and high pressure environment of the supercritical power station, ensuring the tightness of the connection between the valve body 1 and the external pipeline, and preventing fluid leakage.

[0034] The two pressure relief structures 3 include two pressure relief holes 301, four pressure relief holes 302, four bottom plates 303, two telescopic rods 304, and two compression springs 305. The two pressure relief holes 301 are respectively arranged at the center of the valve body 1 and the upper plate 4 on both sides of the center. The four pressure relief holes 302 are respectively grouped in twos, and the two groups of pressure relief holes 302 are respectively arranged in an upper and lower arrangement on the upper plate 4; at the center of the two side walls, the four bottom plates 303 are respectively grouped in twos, and the two groups of bottom plates 303 are respectively arranged in an upper and lower arrangement at the center of the two pressure relief holes 301. The two telescopic rods 304 are respectively arranged between the two groups of bottom plates 303, and the two compression springs 305 are respectively sleeved. It is located on the outer side walls of the two telescopic rods 304. When the internal pressure of the valve body 1 is too high, the pressure of the fluid acts on the bottom plate 303. Due to the excessive pressure, the bottom plate 303 is pushed upward, and the telescopic rod 304 is compressed. At this time, the compression spring 305 is compressed. As the bottom plate 303 moves upward, the pressure relief hole 301 is opened, and the fluid enters the interior of the upper plate 4 through the pressure relief hole 301, and then is discharged through the pressure relief holes 302 arranged in the center of the two side walls of the upper plate 4, thereby reducing the pressure inside the valve body 1. When the pressure returns to normal, the elastic force of the compression spring 305 pushes the bottom plate 303 back to its original position and re-closes the pressure relief hole 301.

[0035] The protective structure 7 includes a wear-resistant layer 701, a protective layer 702, and an elastic sealing layer 703. The protective layer 702 is sleeved on the outer wall of the sealing gate valve stem 6, and the wear-resistant layer 701 is sleeved on the outer wall of the protective layer 702. The elastic sealing layer 703 is located at the center of the lower end surface of the sealing gate valve stem 6. During the use of this high-temperature and high-pressure resistant gate valve, the sealing gate valve stem 6 will continuously move up and down to control the opening and closing of the valve. The protective layer 702 provides basic protection for the sealing gate valve stem 6. When the sealing gate valve stem 6 rubs against the internal structure of the valve body 1 or other components, the wear-resistant layer 701 first withstands the friction, reducing wear on the internal protective layer 702 and the sealing gate valve stem 6. When the sealing gate valve stem 6 descends to close the valve, the elastic sealing layer 703 contacts the valve body 1 and undergoes elastic deformation under the action of pressure, tightly fitting the valve body 1, achieving an excellent sealing effect. This structure can adapt to the harsh working environment of high temperature and high pressure such as supercritical power plants, ensuring that the valve can still function normally under extreme conditions and providing protection for the stable operation of the power plant system.

[0036] Working principle: The flange 201 is installed at the center of the two side walls of the valve body 1, and the valve body 1 is tightly connected to the connecting pipe 203 by bolts 202. The connecting pipe 203 serves as a channel connecting the valve body 1 and the external pipeline. When the fluid enters the valve body 1 through the connecting pipe 203, the filter screen 204 can filter impurities in the fluid. The combined connection method of the flange 201 and the bolt 202 is firm and reliable, and can withstand the huge pressure in the high temperature and high pressure environment of the supercritical power station, ensuring the tightness of the connection between the valve body 1 and the external pipeline to prevent fluid leakage. In the working environment of the supercritical power station, the fluid enters from the connecting structure 2 on one side of the valve body 1 and passes through one of the flow chambers 5. Due to the two flows, 5 are respectively located at the lower center of one side and the upper center of the other side inside the valve body 1, so that the fluid forms a specific flow path inside the valve body 1. When the sealing gate valve stem 6 is in different positions, it can control the connection or isolation between the two flow chambers 5, thereby realizing the opening and closing functions of the valve.

[0037] When the pressure inside the valve body 1 is too high, the pressure of the fluid acts on the bottom plate 303. Due to the excessive pressure, the bottom plate 303 is pushed upward, and the telescopic rod 304 is compressed. At the same time, the compression spring 305 is compressed. As the bottom plate 303 moves upward, the pressure relief hole 301 is opened, and the fluid enters the interior of the upper plate 4 through the pressure relief hole 301, and then is discharged through the pressure relief holes 302 arranged in the center of the two side walls of the upper plate 4, thereby reducing the pressure inside the valve body 1. When the pressure returns to normal, the elastic force of the compression spring 305 pushes the bottom plate 303 back to its original position, re-closing the pressure relief hole 301, and the sealing gate valve stem 6 is rotated by the rotating rod 8. When the sealing gate valve stem 6 descends, it is inserted between the two flow chambers 5 to block the flow of the fluid and close the valve. When the sealing gate valve stem 6 rises, the two flow chambers 5 are reconnected, and the fluid can continue to flow, thereby opening the valve. During the use of the high-temperature and high-pressure gate valve, the sealing gate valve stem 6 will continuously move up and down to control the opening and closing of the valve. The protective layer 702 provides basic protection for the sealing gate valve stem 6. When the sealing gate valve stem 6 rubs against the internal structure of the valve body 1 or other components, the wear-resistant layer 701 first bears the friction, thereby reducing the wear on the internal protective layer 702 and the sealing gate valve stem 6.

[0038] When the sealing gate valve stem 6 descends to close the valve, the elastic sealing layer 703 contacts the valve body 1, undergoes elastic deformation under the action of pressure, and fits tightly to the valve body 1 to achieve a good sealing effect. It can adapt to the harsh working environment of high temperature and high pressure such as supercritical power plants, ensuring that the valve can still work normally under extreme conditions, providing protection for the stable operation of the power station system, and ensuring its sealing performance and operational reliability. The stabilizing disk 9, support legs 10 and support disk 11 work together to provide stable support for the rotating rod 8. During the operation of the valve, the rotating rod 8 needs to withstand a certain torque and axial force. These components can prevent the rotating rod 8 from shaking or offsetting, ensuring precise control of the valve. The rotating disk 12 facilitates the operator to rotate the rotating rod 8. By rotating the rotating disk 12, the up and down movement of the sealing gate valve stem 6 can be easily controlled to realize the opening and closing of the valve.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-temperature and high-pressure gate valve for a supercritical power station, comprising a valve body (1), characterized in that: The valve body (1) is provided with a connection structure (2) at the center of both side walls, an upper plate (4) is provided at the center of the upper end face of the valve body (1), a flow cavity (5) is provided at the lower center of one side and at the upper center of the other side of the valve body (1), a pressure relief structure (3) is provided inside the valve body (1) at the center of the upper end face of the two flow cavities (5), a sealing gate valve rod (6) is provided at the upper center of the valve body (1), a protective structure (7) is provided on the outer side wall of the sealing gate valve rod (6), a rotating rod (8) is fixedly connected at the center of the upper end face of the sealing gate valve rod (6), a stabilizing disk (9) is provided on the outer side wall of the rotating rod (8) on the upper end face of the upper plate (4), and four supporting legs (10) are arranged in a ring on the upper end face of the stabilizing disk (9), a supporting disk (11) is provided on the outer side wall of the rotating rod (8) on the upper end face of the supporting leg (10), and a rotating disk (12) is fixedly connected at the upper center of the outer side wall of the rotating rod (8).

2. The high temperature and high pressure gate valve for supercritical power plants according to claim 1, characterized in that: The two connecting structures (2) include two flanges (201), eight bolts (202), a connecting pipe (203) and a filter screen (204). The two flanges (201) are arranged at the center of the two side walls of the valve body (1). The eight bolts (202) are grouped in groups of four. The two groups of bolts (202) are arranged in a circular shape on one side wall of the two flanges (201). The two connecting pipes (203) are respectively arranged on the two side walls of the valve body (1) at the inner center of the two flanges (201). The two filter screens (204) are respectively arranged at the inner center of the two connecting pipes (203).

3. The high temperature and high pressure gate valve for supercritical power plants according to claim 1, characterized in that: The two pressure relief structures (3) include two pressure relief holes (301), four pressure discharge holes (302), four bottom plates (303), two telescopic rods (304), and two compression springs (305). The two pressure relief holes (301) are respectively arranged at the upper center of the valve body (1) and the inner center of the upper plate (4). The four pressure discharge holes (302) are respectively grouped in twos, and the two groups of pressure discharge holes (302) are respectively arranged in an upper and lower arrangement on the upper plate (4); at the center of the two side walls, the four bottom plates (303) are respectively grouped in twos, and the two groups of bottom plates (303) are respectively arranged in an upper and lower arrangement at the inner center of the two pressure relief holes (301). The two telescopic rods (304) are respectively arranged between the two groups of bottom plates (303), and the two compression springs (305) are respectively sleeved on the outer side walls of the two telescopic rods (304).

4. The high temperature and high pressure gate valve for supercritical power plants according to claim 1, characterized in that: The protective structure (7) comprises a wear-resistant layer (701), a protective layer (702) and an elastic sealing layer (703); the protective layer (702) is sleeved on the outer wall of the sealing gate valve stem (6); the wear-resistant layer (701) is sleeved on the outer wall of the protective layer (702); and the elastic sealing layer (703) is arranged at the center of the lower end surface of the sealing gate valve stem (6).

5. The high temperature and high pressure gate valve for supercritical power plants according to claim 1, characterized in that: The two flow chambers (5) are both arranged at an inclination.

6. The high temperature and high pressure gate valve for supercritical power plants according to claim 1, characterized in that: The sealing gate valve stem (6) and the two flow chambers (5) are adapted to each other.

7. The high temperature and high pressure gate valve for supercritical power plants according to claim 1, characterized in that: The valve body (1) is made of high-strength steel.

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