Gate valve

Abstract

The utility model relates to the technical field of valves, in particular to a gate valve. The gate valve comprises a valve body assembly, a gate plate assembly and a sealing part, the valve body assembly is provided with a circulation cavity, a first circulation opening and a second circulation opening, and the first circulation opening and the second circulation opening are coaxially arranged. The gate valve has a fully-closed state, in the fully-closed state, the sealing component is located between the inner wall of the circulation cavity and the outer side wall of the gate plate assembly, and a first sealing area and a second sealing area which are independently arranged can be defined by the sealing component, the inner wall of the circulation cavity and the outer side wall of the gate plate assembly; the projection of an opening, close to one end of the circulation cavity, of the first circulation opening on the flashboard assembly in the axial direction is in the first sealing area, and the projection of an opening, close to one end of the circulation cavity, of the second circulation opening on the flashboard assembly in the axial direction is in the second sealing area. According to the gate valve, the problem that an existing gate valve is insufficient in sealing performance when closed is solved.

Description

gate Technical Field

[0001] This application relates to the field of valve technology, and in particular to a gate valve. Background Technology

[0002] Currently, gate valves typically employ a straight-through structure, meaning that the two connecting pipes on the gate valve are coaxially arranged and vertically connected to the valve seat. While this provides greater flow capacity, the gate valve suffers from insufficient sealing in this structure. This allows some fluid to still flow through the gap between the valve head and the valve seat when the gate valve is fully closed, thus affecting the safety of the gate valve when closed. Summary of the Invention

[0003] Therefore, it is necessary to provide a gate valve to solve the problem of insufficient sealing performance of existing gate valves when closed.

[0004] This application provides a gate valve, which includes a valve body assembly, a gate assembly, and a sealing component. The valve body assembly has a flow cavity and a first flow port and a second flow port communicating with the flow cavity. The first flow port and the second flow port are respectively located on opposite sides of the valve body assembly along its own radial direction, and the first flow port and the second flow port are coaxially arranged. The gate valve has a fully closed state, and in the fully closed state, the sealing component is located between the inner wall of the flow cavity and the outer wall of the gate assembly, and the sealing component, the inner wall of the flow cavity, and the outer wall of the gate assembly can form an independently set first sealing area and a second sealing area. Furthermore, the opening of the first flow port near the end of the flow cavity projects onto the gate assembly along its own axial direction within the first sealing area, and the opening of the second flow port near the end of the flow cavity projects onto the gate assembly along its own axial direction within the second sealing area.

[0005] In one embodiment, the sealing component includes a first seal, a second seal, a third seal, and a fourth seal. When the gate valve is in the fully closed state, the first seal and the second seal are spaced apart along the axial direction of the gate assembly. The third seal and the fourth seal are respectively located on opposite sides of the gate assembly along its own radial direction, and the two ends of the third seal are respectively connected to the first seal and the second seal, and the two ends of the fourth seal are respectively connected to the first seal and the second seal.

[0006] In one embodiment, the sealing component includes a first seal and a second seal, which are arranged crosswise and connected to each other.

[0007] In one embodiment, the sealing component is an integral structure.

[0008] In one embodiment, the outer wall of the gate assembly has a sealing groove recessed towards its own axis, and the sealing component is installed in the sealing groove; or, the inner wall of the flow cavity has a sealing groove recessed, and the sealing component is installed in the sealing groove.

[0009] In one embodiment, the gate valve further includes a valve stem, and the gate assembly includes a valve head and a nut sleeve, the nut sleeve being disposed at one end of the valve head, and one end of the valve stem being inserted into the nut sleeve and threadedly connected to the nut sleeve.

[0010] In one embodiment, the valve body assembly includes a valve seat and a limiting sleeve. The limiting sleeve is disposed at one end of the valve seat and connected to the valve seat. The limiting sleeve has a limiting hole. The end of the nut sleeve away from the valve head is movably inserted into the limiting hole. The outer wall of the nut sleeve has a first anti-rotation part, and the inner wall of the limiting hole has a second anti-rotation part. The first anti-rotation part and the second anti-rotation part are matched to limit the rotation of the nut sleeve relative to the limiting hole.

[0011] In one embodiment, the valve body assembly includes a valve seat, with the first flow port, the second flow port, and a portion of the flow cavity disposed on the valve seat; the valve seat is configured as a tension member, and / or, the valve seat is configured as a stainless steel member.

[0012] In one embodiment, the gate valve further includes a rotary bearing mounted within the valve body assembly, with the outer ring of the rotary bearing connected to the valve body assembly and the inner ring of the rotary bearing connected to the valve stem.

[0013] In one embodiment, the gate valve also has a fully open state, and in the fully open state, the projections of the openings of the first flow port and the second flow port near the flow cavity end along their own axial direction do not coincide with the gate assembly.

[0014] Compared with the prior art, the gate valve provided in this application, when the gate valve is in the fully closed state, forms a first sealing area and a second sealing area with the sealing component, valve body assembly, and gate assembly. Since the first and second sealing areas are independently configured, they form a groove-like structure. This allows the first and second sealing areas to form a closed cavity with the inner wall of the flow cavity when the sealing component abuts against it. Furthermore, because the projection of the opening of the first flow port near the flow cavity end along its axial direction onto the gate assembly is within the first sealing area, that is, the area around the first flow port is sealed by the sidewall of the first sealing area, it effectively prevents fluid at the first flow port from seeping through the gap between the outer wall of the gate assembly and the inner wall of the flow cavity. The same applies to the second flow port. Therefore, the flow paths of both the first and second flow ports in the fully closed state are blocked by the sealing component, effectively reducing the probability of internal leakage. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 is a cross-sectional view of a gate valve according to an embodiment of this application;

[0017] Figure 2 is a schematic diagram of the structure of a gate assembly according to an embodiment of this application;

[0018] Figure 3 is a structural schematic diagram of a sealing component according to an embodiment of this application;

[0019] Figure 4 is a structural schematic diagram of a sealing component according to another embodiment of this application;

[0020] Figure 5 is a cross-sectional view of a gate valve according to an embodiment of this application.

[0021] The symbols in the diagram represent the following meanings:

[0022] 100. Gate valve; 10. Valve body assembly; 101. Flow chamber; 102. First flow port; 103. Second flow port; 104. Limiting hole; 11. Valve seat; 12. Limiting sleeve; 121. Second anti-rotation part; 13. Bearing seat; 14. First connecting pipe; 15. Second connecting pipe; 20. Valve stem; 21. Rotary bearing; 22. Protrusion; 23. Mating part; 30. Gate assembly; 301. Sealing groove; 31. Valve head; 32. Nut sleeve; 321. First anti-rotation part; 33. Sealing component; 3301. First sealing area; 3302. Second sealing area; 331. First sealing element; 332. Second sealing element; 333. Third sealing element; 334. Fourth sealing element; 40. Rotor assembly. Detailed Implementation

[0023] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0028] Please refer to Figures 1-5. This application provides a gate valve 100, which includes a valve body assembly 10, a gate assembly 30, and a sealing component 33. The valve body assembly 10 has a flow cavity 101 and a first flow port 102 and a second flow port 103 communicating with the flow cavity 101. The gate assembly 30 is movably installed in the flow cavity 101. The first flow port 102 and the second flow port 103 are respectively located on opposite sides of the valve body assembly 10 along its own radial direction, and the first flow port 102 and the second flow port 103 are coaxially arranged. The gate valve 100 also includes a first connecting pipe 14 and a second connecting pipe 15. The first connecting pipe 14 is inserted into the first flow port 102 and communicates with the flow cavity 101, and the second connecting pipe 15 is inserted into the second flow port 103 and communicates with the flow cavity 101.

[0029] Furthermore, the gate valve 100 has a fully closed state, and in the fully closed state, the sealing member 33 is located between the inner wall of the flow cavity 101 and the outer wall of the gate assembly 30, and the sealing member 33 and the inner wall of the flow cavity 101 and the outer wall of the gate assembly 30 can form an independently configured first sealing area 3301 and a second sealing area 3302. In addition, the projection of the opening of the first flow port 102 near the end of the flow cavity 101 along its own axial direction onto the gate assembly 30 is within the first sealing area 3301, and the projection of the opening of the second flow port 103 near the end of the flow cavity 101 along its own axial direction onto the gate assembly 30 is within the second sealing area 3302.

[0030] Understandably, when the gate valve 100 is in the fully closed state, the sealing component 33, together with the valve body assembly 10 and the gate assembly 30, forms a first sealing area 3301 and a second sealing area 3302. Since the first sealing area 3301 and the second sealing area 3302 are independently configured, they form a closed cavity isolated from the flow cavity 101. Furthermore, since the projection of the opening of the first flow port 102 near the flow cavity 101 along its own axial direction onto the gate assembly 30 is within the first sealing area 3301, that is, the area around the first flow port 102 is sealed by the sidewall of the first sealing area 3301, this effectively prevents fluid at the first flow port 102 from seeping through the gap between the outer wall of the gate assembly 30 and the inner wall of the flow cavity 101. The same applies to the second flow port 103. Therefore, the flow paths of the first flow port 102 and the second flow port 103 in the fully closed state are both blocked by the sealing component 33, effectively reducing the probability of internal leakage.

[0031] Optionally, the sealing component 33 can be installed on the gate assembly 30. For example, as shown in FIG2, a sealing groove 301 recessed towards its own axis is provided on the outer side wall of the gate assembly 30, and the sealing component 33 is installed in the sealing groove 301. Here, the shape of the sealing groove 301 can be adapted to the shape of the sealing component 33 to improve the installation strength of the sealing component 33 on the gate assembly 30.

[0032] Of course, the sealing component 33 can be installed on the inner wall of the flow cavity 101. For example, the inner wall of the flow cavity 101 is recessed to form a sealing groove 301, and the sealing component 33 is installed in the sealing groove 301. In this way, the installation of the sealing component 33 can also be achieved.

[0033] For ease of explanation, this application uses the example of a sealing component 33 installed on a gate assembly 30. It can achieve sealing in the fully closed state and also meet the sealing requirements when the gate assembly 30 moves, thus eliminating the need for additional sealing components on the gate assembly 30 and reducing costs.

[0034] In one embodiment, the gate valve 100 further includes a rotor assembly 40 and a valve stem 20. One end of the valve stem 20 is connected to the rotor assembly 40, and the other end is connected to the gate assembly 30, so that the rotor assembly 40 can drive the valve stem 20 to rotate and drive the gate assembly 30 to move axially, thereby controlling the opening and closing of the gate valve 100.

[0035] Specifically, the gate assembly 30 includes a valve head 31 and a nut sleeve 32. The nut sleeve 32 is disposed at one end of the valve head 31. Here, the valve head 31 and the nut sleeve 32 can be an integral or separate structure. One end of the valve stem 20 is inserted into the nut sleeve 32 and threadedly connected to the nut sleeve 32 to convert the circumferential rotation of the valve stem 20 into the axial movement of the gate assembly 30. Furthermore, when the valve head 31 and the nut sleeve 32 are separately disposed, it is easier to process the valve head 31 and the nut sleeve 32, which can reduce the processing difficulty. Here, the sealing component 33 can be installed on the valve head 31.

[0036] In one embodiment, as shown in FIG3, the sealing component 33 includes a first sealing element 331, a second sealing element 332, a third sealing element 333, and a fourth sealing element 334. When the gate valve 100 is in the fully closed state, the first sealing element 331 and the second sealing element 332 are spaced apart along the axial direction of the gate assembly 30. The third sealing element 333 and the fourth sealing element 334 are respectively disposed on opposite sides of the gate assembly 30 along its own radial direction. The two ends of the third sealing element 333 are respectively connected to the first sealing element 331 and the second sealing element 332, and the two ends of the fourth sealing element 334 are respectively connected to the first sealing element 331 and the second sealing element 332.

[0037] Typically, both the flow cavity 101 and the valve head 31 extend in a cylindrical shape. Therefore, the first seal 331 and the second seal 332 can be configured as an annular sealing ring structure to block the axial flow of fluid from the gap along the flow cavity 101. Simultaneously, the third seal 333 and the fourth seal 334 are located between the first flow port 102 and the second flow port 103, and are arranged opposite to each other. This allows the third seal 333 and the fourth seal 334 to block the gap along the circumference of the flow cavity 101. Thus, in the fully closed state, the flow path of fluid at the first flow port 102 or the second flow port 103 along the axial and circumferential directions of the flow cavity 101 is restricted, thereby ensuring sealing performance in the fully closed state and preventing internal leakage. In other words, the first seal 331, the second seal 332, the third seal 333, the fourth seal 334, the gate assembly 30, and the valve body assembly 10 form the first sealing area 3301 and the second sealing area 3302. The third seal 333 and the fourth seal 334 can be configured as straight, arc or serpentine, as long as they can achieve the connection between the first seal 331 and the second seal 332. No further restrictions are imposed here.

[0038] In another embodiment, as shown in FIG4, the sealing component 33 includes a first sealing element 331 and a second sealing element 332. The first sealing element 331 and the second sealing element 332 are both sleeved and installed on the outer periphery of the gate assembly 30, and the first sealing element 331 and the second sealing element 332 are cross-arranged and connected to each other. That is, in this embodiment, the first sealing element 331 and the second sealing element 332 are both elliptical in shape, and form a closed first sealing area 3301 and a second sealing area 3302 through cross-connection. When the gate valve 100 is in the fully closed state, it can also prevent fluid from flowing along the axial and circumferential directions of the flow cavity 101 in the gap, realize the isolation of the first flow port 102 and the second flow port 103, and ensure the safety when closing the valve.

[0039] In one embodiment, as shown in Figures 3 and 4, the sealing component 33 can be an integral structure to improve the structural strength of the sealing component 33, thereby ensuring the reliability of the overall structure.

[0040] In other embodiments, the sealing component 33 may also adopt a split structure. For example, the sealing component 33 may be divided into two parts corresponding to the first flow port 102 and the second flow port 103, and a first sealing area 3301 and a second sealing area 3302 arranged in a circular or rectangular manner are formed on the outer wall of the gate assembly 30.

[0041] In one embodiment, as shown in FIG5, the gate valve 100 also has a fully open state, and in the fully open state, the projections of the openings of the first flow port 102 and the second flow port 103 near the flow cavity 101 along their own axial direction do not coincide with the gate assembly 30. That is, in the fully open state, the gate assembly 30 can be completely moved above the first flow port 102 and the second flow port 103, realizing full passage of the first flow port 102 and the second flow port 103, eliminating the flow resistance generated by the internal components of the gate valve 100 on the flow of fluid in the flow cavity 101, thereby effectively improving the flow performance of the gate valve 100.

[0042] In one embodiment, the valve body assembly 10 is further provided with a limiting hole 104 communicating with the flow cavity 101, and the end of the nut sleeve 32 away from the valve head 31 is movably inserted into the limiting hole 104. A non-rotation structure is provided between the nut sleeve 32 and the limiting hole 104 to prevent rotation of the nut sleeve 32 relative to the limiting hole 104. It is understood that by setting the non-rotation structure, the rotation of the nut sleeve 32 and the limiting hole 104 can be prevented, ensuring that the nut sleeve 32 can only move axially during valve opening and closing, and will not rotate circumferentially. This effectively prevents the gate assembly 30 from rotating, thereby reducing friction between the gate assembly 30 and the inner wall of the flow cavity 101. This not only reduces friction and wear, extending the service life of components, but also reduces friction noise, thereby improving the user experience of the gate valve 100.

[0043] Specifically, in this embodiment, the outer wall of the nut sleeve 32 is provided with a first anti-rotation portion 321, and the inner wall of the limiting hole 104 is provided with a second anti-rotation portion 121. The first anti-rotation portion 321 and the second anti-rotation portion 121 cooperate to form an anti-rotation structure. Both the first anti-rotation portion 321 and the second anti-rotation portion 121 can be configured with anti-rotation surfaces. Here, the anti-rotation surface can be a planar structure for better anti-rotation effect, or it can be a curved surface or other structure with a certain curvature. Of course, in other embodiments, the anti-rotation structure can also take the form of protrusions and grooves, etc., which are not limited here.

[0044] Furthermore, there are multiple first anti-rotation portions 321, which are spaced apart on the outer side wall of the nut sleeve 32. The number of second anti-rotation portions 121 corresponds one-to-one with the number of first anti-rotation portions 321. This further prevents circumferential rotation of the nut sleeve 32 and ensures the stability of the gate assembly 30's axial movement.

[0045] In this embodiment, there are two first anti-rotation parts 321, and the two first anti-rotation parts 321 are provided on the opposite side walls of the nut sleeve 32 along its own radial direction. Of course, in other embodiments, the first anti-rotation parts 321 can also be set to three, four, etc., as long as they can achieve the same effect.

[0046] To facilitate the machining of the limiting hole 104, in one embodiment, as shown in FIG1, the valve body assembly 10 includes a valve seat 11 and a limiting sleeve 12. A first flow port 102, a second flow port 103, and a portion of the flow cavity 101 are disposed on the valve seat 11, and the limiting sleeve 12 is disposed at one end of the valve seat 11 and connected to the valve seat 11. The limiting hole 104 is formed in the limiting sleeve 12. Thus, by separating the valve seat 11 and the limiting sleeve 12, the limiting sleeve 12 can be machined individually, thereby improving the machining accuracy of the limiting sleeve 12 and reducing the machining difficulty. Alternatively, the valve seat 11 and the limiting sleeve 12 can also be an integral structure.

[0047] Furthermore, the same method of using protrusions and grooves, or flat contact, can be used to prevent the limit sleeve 12 from rotating relative to the valve seat 11, thereby further improving the reliability of the structure.

[0048] Among them, the nut sleeve 32 and / or the limiting sleeve 12 are configured as plastic material parts. The plastic material has a high surface finish and low friction, which can reduce the frictional resistance between the nut sleeve 32 and the limiting sleeve 12.

[0049] In one embodiment, the valve seat 11 is configured as a stainless steel part. Stainless steel has a low cost, which can reduce the production cost of the gate valve 100. At the same time, the valve seat 11 can be configured as a drawn part, which simplifies the processing through stretching.

[0050] Since in this embodiment, the valve stem 20 drives the gate assembly 30 to move, and the axial movement of the gate assembly 30 achieves the valve opening and closing functions, to improve the reliability of the cooperation between the valve stem 20 and the gate assembly 30, the axial position of the valve stem 20 relative to the valve body assembly 10 can be kept constant. Based on this, in one embodiment, the gate valve 100 also includes a rotary bearing 21, which is installed inside the valve body assembly 10. The outer ring of the rotary bearing 21 is connected to the valve body assembly 10, and the inner ring of the rotary bearing 21 is connected to the valve stem 20, so that the rotary bearing 21 can prevent the valve stem 20 from moving axially relative to the valve body assembly 10. It is easy to understand that the valve stem 20 achieves both connection with the valve body assembly 10 and axial limitation through the rotary bearing 21, and also reduces the resistance when the valve stem 20 rotates circumferentially, resulting in higher reliability. Furthermore, the valve stem 20 can only rotate circumferentially through the rotating bearing 21, while remaining stationary axially. The nut sleeve 32 is kept circumferentially stationary through the limiting sleeve 12. Therefore, the nut sleeve 32 can only move axially under the threaded drive of the valve stem 20.

[0051] To further reduce the probability of axial movement of the valve stem 20, a protrusion 22 is formed on the outer periphery of the valve stem 20. The gate valve 100 also includes a mating part 23. The protrusion 22 and the mating part 23 are respectively located at opposite ends of the rotating bearing 21 along its own axial direction, and the mating part 23 is sleeved and connected to the valve stem 20 so that the protrusion 22 and the mating part 23 can cooperate to clamp the inner ring of the rotating bearing 21. In this way, through the connection between the mating part 23 and the valve stem 20, and in conjunction with the protrusion 22 formed on the valve stem 20, the strength of the connection between the valve stem 20 and the rotating bearing 21 can be effectively improved, preventing the valve stem 20 from moving axially, and making the overall structure more reliable.

[0052] Specifically, the valve body assembly 10 also includes a bearing housing 13, which is sleeved on the outer periphery of the limiting sleeve 12 and connected to both the valve seat 11 and the limiting sleeve 12 to prevent the limiting sleeve 12 from moving axially relative to the valve seat 11. Optionally, the bearing housing 13 can use its own end and / or internal stepped holes to cooperate with the valve seat 11 to achieve axial limiting of the limiting sleeve 12. A rotary bearing 21 is installed inside the bearing housing 13, with its outer ring fixedly connected to the bearing housing 13 and its inner ring connected to the valve stem 20, so that the rotary bearing 21 can prevent the valve stem 20 from moving axially. This facilitates the installation of the rotary bearing 21.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A gate valve, characterized in that, The valve includes a valve body assembly (10), a gate assembly (30), and a sealing component (33). The valve body assembly (10) has a flow cavity (101) and a first flow port (102) and a second flow port (103) communicating with the flow cavity (101). The first flow port (102) and the second flow port (103) are respectively located on opposite sides of the valve body assembly (10) along its own radial direction, and the first flow port (102) and the second flow port (103) are coaxially arranged. The gate valve has a fully closed state, and in the fully closed state, the sealing component (33) is located on the inner wall of the flow cavity (101) and the gate valve. Between the outer walls of the plate assembly (30), and between the sealing member (33) and the inner wall of the flow cavity (101) and the outer wall of the gate assembly (30), an independently configured first sealing area (3301) and a second sealing area (3302) can be formed. The opening of the first flow port (102) near the end of the flow cavity (101) is projected along its own axial direction into the first sealing area (3301) of the gate assembly (30). The opening of the second flow port (103) near the end of the flow cavity (101) is projected along its own axial direction into the second sealing area (3302) of the gate assembly (30).

2. The gate valve according to claim 1, characterized in that, The sealing component (33) includes a first seal (331), a second seal (332), a third seal (333), and a fourth seal (334). When the gate valve is in the fully closed state, the first seal (331) and the second seal (332) are spaced apart along the axial direction of the gate assembly (30). The third seal (333) and the fourth seal (334) are respectively located on opposite sides of the gate assembly (30) along its own radial direction. The two ends of the third seal (333) are respectively connected to the first seal (331) and the second seal (332), and the two ends of the fourth seal (334) are respectively connected to the first seal (331) and the second seal (332).

3. The gate valve according to claim 1, characterized in that, The sealing component (33) includes a first sealing element (331) and a second sealing element (332), which are arranged crosswise and connected to each other.

4. The gate valve according to any one of claims 1-3, characterized in that, The sealing component (33) is an integral structure.

5. The gate valve according to any one of claims 1-3, characterized in that, The outer wall of the gate assembly (30) is provided with a sealing groove (301) that is recessed toward its own axis, and the sealing component (33) is installed in the sealing groove (301); or, the inner wall of the flow cavity (101) is recessed to form a sealing groove (301), and the sealing component (33) is installed in the sealing groove (301).

6. The gate valve according to claim 1, characterized in that, The gate valve also includes a valve stem (20), and the gate assembly (30) includes a valve head (31) and a nut sleeve (32). The nut sleeve (32) is disposed at one end of the valve head (31), and one end of the valve stem (20) is inserted into the nut sleeve (32) and threadedly connected to the nut sleeve (32).

7. The gate valve according to claim 6, characterized in that, The valve body assembly (10) includes a valve seat (11) and a limiting sleeve (12). The limiting sleeve (12) is disposed at one end of the valve seat (11) and connected to the valve seat (11). The limiting sleeve (12) has a limiting hole (104). The end of the nut sleeve (32) away from the valve head (31) is movably inserted into the limiting hole (104). The outer wall of the nut sleeve (32) is provided with a first anti-rotation part (321), and the inner wall of the limiting hole (104) is provided with a second anti-rotation part (121). The first anti-rotation part (321) and the second anti-rotation part (121) are mutually limiting to prevent the nut sleeve (32) from rotating relative to the limiting hole (104).

8. The gate valve according to claim 1, characterized in that, The valve body assembly (10) includes a valve seat (11), a first flow port (102), a second flow port (103) and a portion of the flow cavity (101) are disposed on the valve seat (11); the valve seat (11) is configured as a tension member, and / or the valve seat (11) is configured as a stainless steel member.

9. The gate valve according to claim 6, characterized in that, The gate valve also includes a rotary bearing (21), which is installed inside the valve body assembly (10), and the outer ring of the rotary bearing (21) is connected to the valve body assembly (10), and the inner ring of the rotary bearing (21) is connected to the valve stem (20).

10. The gate valve according to claim 1, characterized in that, The gate valve also has a fully open state, and in the fully open state, the projection of the openings of the first flow port (102) and the second flow port (103) near the end of the flow cavity (101) along their own axial direction does not coincide with the gate assembly (30).

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