Stop valve

Abstract

The utility model relates to the technical field of valves, in particular to a stop valve. A stop valve comprises a valve body assembly, a valve element assembly and a static valve element, a valve port is formed in the valve body assembly, the valve element assembly and the static valve element are arranged in the valve body assembly, one end of the valve element assembly is arranged on the static valve element, and the valve element assembly can rotate to block or open a communicating hole; the stop valve further comprises a positioning structure, the valve body assembly comprises a valve pipe, the valve element assembly is sleeved with the positioning structure, the positioning structure is arranged in the valve pipe, the outer wall of the positioning structure abuts against the inner wall of the valve pipe, the inner wall of the positioning structure abuts against the valve element assembly so that the valve element assembly can be limited in the radial direction, and the end, close to the static valve element, of the positioning structure abuts against the valve element assembly. And the valve core assembly is axially limited. The check valve has the advantages that the concentricity of the valve element assembly and the static valve element can be guaranteed, and internal leakage caused by a gap generated between the movable valve element and the static valve element is prevented.

Description

Technical Field

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

[0002] Gate valves are commonly used in piping systems to shut off the piping. A gate valve typically consists of a valve core assembly and a stationary valve core. The stationary valve core is located at the valve port and has a connecting hole that communicates with the port. One end of the valve core assembly is in contact with the stationary valve core. Rotating the valve core assembly can block or open the connecting hole, thereby closing or opening the gate valve.

[0003] In related technologies, during long-term use, the valve core assembly may shift, making it difficult to ensure the concentricity of the valve core assembly and the stationary valve core. This results in a loose seal when the valve core assembly blocks the connecting hole, leading to internal leakage in the shut-off valve. Utility Model Content

[0004] Therefore, it is necessary to provide a shut-off valve that can prevent internal leakage.

[0005] This utility model provides a shut-off valve, including a valve body assembly, a valve core assembly, and a stationary valve core. The valve body assembly has a valve port. The valve core assembly and the stationary valve core are disposed within the valve body assembly. The stationary valve core is located at the valve port and has a communicating hole communicating with the valve port. One end of the valve core assembly is disposed on the stationary valve core. The valve core assembly rotates to block or open the communicating hole. The shut-off valve also includes a positioning structure. The valve body assembly includes a valve tube. The positioning structure is sleeved outside the valve core assembly and disposed inside the valve tube. The outer wall of the positioning structure abuts against the inner wall of the valve tube, and the inner wall of the positioning structure abuts against the valve core assembly to radially limit the valve core assembly. The end of the positioning structure near the stationary valve core abuts against the valve core assembly to axially limit the valve core assembly.

[0006] With this configuration, the positioning structure not only ensures the concentricity of the valve core assembly and the stationary valve core, ensuring that the valve core assembly can completely seal the connecting hole, but also ensures that one end of the stationary valve core and the valve core assembly fits tightly, preventing them from loosening and causing internal leakage.

[0007] In one embodiment, the valve core assembly includes a valve stem, the positioning structure includes a bearing, the bearing is sleeved on the valve stem, the inner ring of the bearing abuts against the valve stem, the valve stem includes a small diameter portion and a large diameter portion, the outer diameter of the large diameter portion is larger than the outer diameter of the small diameter portion, so that a step is formed between the large diameter portion and the small diameter portion, and the end face of the bearing near the stationary valve core abuts against the step.

[0008] In one embodiment, the bearing is a tapered roller bearing, and the outer wall of the tapered roller bearing abuts against the inner wall of the valve tube;

[0009] Alternatively, the bearing may include a first bearing and a thrust bearing, the first bearing and the thrust bearing being connected and disposed at the end of the thrust bearing away from the stationary valve core, the first bearing being rotatably in contact with the valve stem and applying a force to the valve stem toward the central axis of the valve stem, and the thrust bearing abutting against the step and applying a force to the step toward the stationary valve core.

[0010] In one embodiment, the bearing is a tapered roller bearing, which includes an inner ring, an outer ring, and tapered rollers disposed between the inner ring and the outer ring. The inner wall of the inner ring abuts against the valve stem, and the end face of the inner ring near the stationary valve core abuts against the step. The outer ring can exert an inclined force on the tapered rollers, so that the inner ring applies a force to the valve stem toward the central axis of the valve stem and a force toward the stationary valve core.

[0011] This configuration allows for the simultaneous application of a force toward the valve stem's central axis and a downward force to the valve stem.

[0012] In one embodiment, the bearing includes a first bearing, which is a needle roller bearing. The needle roller bearing includes a first ring, and a plurality of needle rollers are provided on the inner wall of the first ring. The needle rollers abut against the valve stem.

[0013] This design reduces friction when the valve stem rotates.

[0014] In one embodiment, the bearing includes a thrust bearing, which includes a second shaft ring, the end face of the second shaft ring facing the step having needle rollers or balls, the needle rollers or balls abutting against the step.

[0015] This design reduces friction when the valve stem rotates.

[0016] In one embodiment, the bearing includes a first bearing and a thrust bearing, the first bearing and the thrust bearing being integrally disposed.

[0017] This setup reduces the number of parts and improves installation efficiency.

[0018] In one embodiment, the bearing includes a first bearing and a thrust bearing, and the positioning structure further includes a fixed seat. The fixed seat is sleeved outside the first bearing, the inner wall of the fixed seat abuts against the first bearing, and the outer wall is connected to the valve pipe. The end of the fixed seat near the stationary valve core abuts against the thrust bearing.

[0019] Understandably, the mounting bracket is used for bearing installation.

[0020] In one embodiment, one end of the valve tube is open, and the positioning structure further includes a retaining ring. The retaining ring is located at the opening and abuts against the end of the bearing away from the stationary valve core. The sidewall of the retaining ring is fixedly connected to the inner wall of the valve tube.

[0021] Understandably, the retaining ring not only prevents the bearing from coming out of the valve tube, but also axially limits the valve stem, ensuring that the moving valve core and the stationary valve core fit together tightly.

[0022] This utility model, by setting a positioning structure, has its outer wall abutting against the inner wall of the valve pipe, its inner wall abutting against the valve core assembly, and its end near the stationary valve core abutting against the valve core assembly. At the same time, it provides radial and axial limiting for the valve core assembly. This not only ensures the concentricity of the valve core assembly and the stationary valve core, but also ensures that the stationary valve core and the valve core assembly fit tightly together, preventing them from shifting or loosening and causing internal leakage. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A cross-sectional view of the shut-off valve according to Embodiment 1 of this utility model;

[0025] Figure 2 A three-dimensional view of a tapered roller bearing from one perspective;

[0026] Figure 3 This is a three-dimensional view of a tapered roller bearing from another perspective.

[0027] Figure 4 This is a force analysis diagram for a tapered roller bearing;

[0028] Figure 5 This is a cross-sectional view of the shut-off valve in Embodiment 2;

[0029] Figure 6 This is a partial 3D view of the bearing.

[0030] Reference numerals: 100, gate valve; 10, valve body assembly; 11, valve port; 12, valve pipe; 121, opening; 13, valve seat; 14, cover; 141, main body; 142, connecting sleeve; 201, valve core assembly; 20, valve stem; 21, small diameter section; 22, large diameter section; 23, step; 30, moving valve core; 40, stationary valve core; 41, connecting hole; 50, positioning structure; 51, bearing; 511, tapered roller bearing; 5111, inner shaft ring; 5112, outer shaft ring; 5113, tapered roller; 512, first bearing; 5121, first shaft ring; 5122, needle roller; 513, thrust bearing; 5131, second shaft ring; 5132, gasket; 52, retaining ring; 521, mounting hole; 53, fixed seat. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model 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 utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0032] 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 specification are for illustrative purposes only and do not represent the only possible implementation.

[0033] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this utility model, unless otherwise explicitly 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," "on top of," and "over" 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.

[0035] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0036] Please see Figure 1 and Figure 5 This utility model provides a shut-off valve 100, which is installed in a pipeline system for cutting off or connecting the pipeline system. The pipeline system can be a refrigeration system, a water system, etc.

[0037] Specifically, the shut-off valve 100 includes a valve body assembly 10, a valve core assembly 201, and a stationary valve core 40. The valve body assembly 10 has a valve port 11. The valve core assembly 201 and the stationary valve core 40 are disposed in the valve body assembly 10. The stationary valve core 40 has a communication hole 41 that communicates with the valve port 11. One end of the valve core assembly 201 is disposed on the stationary valve core 40. The valve core assembly 201 rotates so that the valve core assembly 201 can block the communication hole 41.

[0038] The valve body assembly 10 includes a valve tube 12 and a valve seat 13. The valve seat 13 is located inside the valve tube 12, and the valve port 11 is opened on the valve seat 13. The valve seat 13 and the valve tube 12 are separately disposed. The valve seat 13 and the valve tube 12 are machined separately and then connected by laser welding to reduce the processing difficulty.

[0039] Valve body assembly 10 also includes a cover 14, which covers and is connected to valve tube 12.

[0040] The cover 14 includes a main body 141 and a connecting sleeve 142. The main body 141 and the valve pipe 12 are fixedly connected by the connecting sleeve 142. The separate design can reduce the processing difficulty.

[0041] The valve tube 12, connecting sleeve 142 and housing cover 14 are all made of stainless steel and are connected by laser welding, which improves processing efficiency.

[0042] The valve tube 12 has an opening 121 at one end near the housing cover 14. One end of the valve stem 20 is located inside the valve tube 12, and the other end extends out from the opening 121 and into the housing cover 14.

[0043] The valve core assembly 201 includes a valve stem 20 and a moving valve core 30. The moving valve core 30 is disposed on the stationary valve core 40. One end of the valve stem 20 is connected to the moving valve core 30. The valve stem 20 can rotate, thereby driving the moving valve core 30 to rotate. The moving valve core 30 can block the connecting hole 41.

[0044] The valve stem 20 includes a large diameter portion 22 and a small diameter portion 21. The outer diameter of the large diameter portion 22 is larger than the outer diameter of the small diameter portion 21, so that a step 23 is formed between the large diameter portion 22 and the small diameter portion 21. The moving valve core 30 is located at one end of the large diameter portion 22.

[0045] The shut-off valve 100 also includes a motor (not shown), which is located inside the housing 14. One end of the valve stem 20 extends out from the opening 121 and is connected to the motor. The motor drives the valve stem 20 to rotate.

[0046] The shut-off valve 100 also includes a positioning structure 50, which is sleeved on the valve core assembly 201 and connected to the valve pipe 12. The inner wall of the positioning structure 50 abuts against the valve core assembly 201 to radially limit the valve core assembly 201. The end of the positioning structure 50 facing the stationary valve core 40 abuts against the valve core assembly 201 to axially limit the valve core assembly 201. It is understood that during long-term use, the valve core assembly 201 will shift, resulting in a deviation from its original position. The positioning structure 50 of this invention can limit the valve core assembly 201, ensuring the concentricity of the valve core assembly 201 and the stationary valve core 40. This allows the moving valve core 30 to completely block the connecting hole 41 when it blocks it, preventing media leakage. The axial limiting of the valve core assembly 201 by the positioning structure 50 ensures that the moving valve core 30 and the stationary valve core 40 fit tightly together, preventing media leakage between the moving valve core 30 and the stationary valve core 40. It should be explained that, here, radial refers to the straight line direction that is perpendicular to and passes through the central axis of valve core assembly 201, and axial refers to the direction that is parallel to the central axis of valve core assembly 201.

[0047] In one embodiment, the inner wall of the positioning structure 50 abuts against the valve stem 20 to radially limit the valve stem 20, and the end of the positioning structure 50 facing the stationary valve core 40 abuts against the valve stem 20 to axially limit the valve stem 20, thereby radially and axially limiting the entire valve core assembly 201. In another embodiment, the inner wall of the positioning structure 50 abuts against the valve stem 20, and the end of the positioning structure 50 facing the stationary valve core 40 abuts against the moving valve core 30; or, the inner wall of the positioning structure 50 abuts against the moving valve core 30, and the end of the positioning structure 50 facing the stationary valve core 40 abuts against the moving valve core 30.

[0048] Specifically, the inner wall of the positioning structure 50 abuts against the small diameter portion 21, and the end of the positioning structure 50 near the stationary valve core 40 abuts against the step 23.

[0049] The positioning structure 50 includes a bearing 51, which is sleeved on the valve stem 20. The inner ring of the bearing 51 abuts against the valve stem 20, and the end face of the bearing 51 near the stationary valve core 40 abuts against the step 23. The bearing 51 can be a rolling bearing or a roller bearing, which can reduce the friction when the valve stem 20 rotates.

[0050] The positioning structure 50 also includes a retaining ring 52, which is located at the opening 121 and abuts against the end of the bearing 51 away from the stationary valve core 40. The retaining ring 52 is fixedly connected to the valve tube 12. The retaining ring 52 is press-welded to the opening 121 to limit the bearing 51 and to provide pressure for the axial limiting of the valve core assembly 201 by the positioning structure 50, thereby generating downward pressure on the bearing 51 and ensuring that the moving valve core 30 and the stationary valve core 40 fit tightly together.

[0051] The retaining ring 52 has a mounting hole 521, through which the valve stem 20 passes and extends. The inner wall of the mounting hole 521 has a protrusion (not shown) that can abut against the valve stem 20 to restrict the circumferential rotation of the valve stem 20.

[0052] The side of one end of the small diameter portion 21 has two parallel planes and two protrusions. During the rotation of the valve stem 20, the two planes of the small diameter portion 21 can respectively abut against the two protrusions to limit the rotation of the valve stem 20 within a 90° range.

[0053] The retaining ring 52, bearing 51, and stationary valve core 40 are concentrically arranged to ensure that the valve core assembly 201 and the stationary valve core 40 are concentric. It should be explained that, in this utility model, concentricity means that the central axis of the valve core assembly 201 and the central axis of the stationary valve core 40 coincide.

[0054] Example 1

[0055] Please see Figure 2 and Figure 3 The bearing 51 is a tapered roller bearing 511. The inner wall of the tapered roller bearing 511 abuts against the valve stem 20, and the outer wall abuts against the inner wall of the valve tube 12. One end of the tapered roller bearing 511 abuts against the step 23.

[0056] The tapered roller bearing 511 includes an inner ring 5111, an outer ring 5112, and tapered rollers 5113. The tapered rollers 5113 are mounted on the inner ring 5111 and located between the inner ring 5111 and the outer ring 5112. The outer wall of the outer ring 5112 abuts against the inner wall of the valve tube 12. The inner wall is an inclined surface, which abuts against the tapered rollers 5113. The end face of the inner ring 5111 near the stationary valve core 40 abuts against the step 23, and the end face of the outer ring 5112 away from the stationary valve core 40 abuts against the retaining ring 52. When the valve stem 20 rotates, it drives the inner ring 5111 to rotate together. The outer ring 5112 is tightly fitted with the inner wall of the valve tube 12, and the tapered rollers 5113 rotate relative to the outer ring 5112, generating rolling friction, which can reduce the friction when the valve stem 20 rotates.

[0057] Please see Figure 4 The outer shaft ring 5112 has a downward inclined surface, the retaining ring 52 abuts against the outer shaft ring 5112, and the inner wall of the valve tube 12 abuts against the outer shaft ring 5112, causing the tapered roller 5113 to generate a downward inclined force. This force can be decomposed into a force F1 towards the central axis of the valve stem 20 and a downward force F2, thereby positioning the valve stem 20.

[0058] Example 2

[0059] This embodiment is basically the same as Embodiment 1, and the similarities will not be repeated. The differences are as follows:

[0060] Please see Figure 5 and Figure 6 The bearing 51 includes a first bearing 512 and a thrust bearing 513, which are connected. The thrust bearing 513 abuts against the step 23, and the first bearing 512 is sleeved on the outside of the small diameter portion 21. The thrust bearing 513 is used to transmit axial thrust.

[0061] In one embodiment, the first bearing 512 is a needle roller bearing, which includes a first shaft ring 5121. The inner wall of the first shaft ring 5121 is provided with a plurality of needle rollers 5122. The needle rollers 5122 abut against the valve stem 20. The needle rollers 5122 are elongated, which can increase the contact area between the needle rollers 5122 and the valve stem 20, so that the valve stem 20 can rotate stably.

[0062] The thrust bearing 513 includes a second shaft ring 5131. The end face of the second shaft ring 5131 facing the step 23 is provided with a plurality of needle rollers 5122 or balls. The needle rollers 5122 or balls abut against the step 23, thereby reducing the friction force when the valve stem 20 rotates.

[0063] The first bearing 512 and the thrust bearing 513 are integrated into one unit, which reduces the number of parts and facilitates installation.

[0064] The positioning structure 50 also includes a fixing seat 53, which is sleeved on the outside of the first bearing 512. The inner ring of the fixing seat 53 abuts against the outer wall of the first bearing 512 and is tightly fitted with the first bearing 512. The outer wall of the fixing seat 53 abuts against and is fixedly connected to the inner wall of the valve pipe 12. The valve pipe 12 and the fixing seat 53 are tightly fitted, and the inner wall of the valve pipe 12 generates a resisting force on the fixing seat 53 and the first bearing 512 toward the central axis of the valve port 11, thereby ensuring the concentricity of the valve stem 20 and the stationary valve core 40.

[0065] In one embodiment, the fixing seat 53 and the retaining ring 52 are integrally formed, reducing the number of parts and facilitating installation. The fixing seat 53 and the retaining ring 52 are press-welded together to the valve pipe 12, and the fixing seat 53 and the retaining ring 52 can generate downward pressure.

[0066] In one embodiment, a needle roller 5122 is installed on the thrust bearing 513. Since the needle roller 5122 is long and its length is greater than the width of the step 23, a shim 5132 is provided between the thrust bearing 513 and the step 23. This not only ensures the stable transmission of the clamping force between the retaining ring 52 and the fixing seat 53, but also increases the stable contact between the step 23 and the thrust bearing 513.

[0067] During operation, when the shut-off valve 100 needs to be closed, the valve stem 20 is rotated, and the moving valve core 30 blocks the connecting hole 41, closing the valve port 11. When the shut-off valve 100 needs to be opened, the valve stem 20 is rotated, and the moving valve core 30 releases the blockage of the connecting hole 41, opening the valve port 11. The fixed seat 53 and / or retaining ring 52 of the positioning structure 50 are fixedly connected to the valve pipe 12, generating pressure. The fixed seat 53 and / or retaining ring 52 exerts a force on the bearing 51 toward the central axis of the valve stem 20, as well as a downward force, ensuring the concentricity of the valve core assembly 201. At the same time, it ensures that the moving valve core 30 is tightly attached to the stationary valve core 40, preventing internal leakage.

[0068] The technical features of the above-described 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.

[0069] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any appropriate changes and variations made to the above embodiments within the scope of the essential spirit of the present utility model shall fall within the scope of protection claimed by the present utility model.

Claims

1. A shut-off valve, comprising a valve body assembly (10), a valve core assembly (201), and a stationary valve core (40), wherein the valve body assembly (10) has a valve port (11), the valve core assembly (201) and the stationary valve core (40) are disposed within the valve body assembly (10), the stationary valve core (40) is disposed at the valve port (11) and has a communication hole (41) communicating with the valve port (11), one end of the valve core assembly (201) is disposed on the stationary valve core (40), and the valve core assembly (201) is rotatable to block or open the communication hole (41); Its features are, The shut-off valve further includes a positioning structure (50). The valve body assembly (10) includes a valve tube (12). The positioning structure (50) is sleeved outside the valve core assembly (201) and disposed inside the valve tube (12). The outer wall of the positioning structure (50) abuts against the inner wall of the valve tube (12). The inner wall of the positioning structure (50) abuts against the valve core assembly (201) to radially limit the valve core assembly (201). One end of the positioning structure (50) near the stationary valve core (40) abuts against the valve core assembly (201) to axially limit the valve core assembly (201).

2. The shut-off valve according to claim 1, characterized in that, The valve core assembly (201) includes a valve stem (20), and the positioning structure (50) includes a bearing (51). The bearing (51) is sleeved on the valve stem (20), and the inner ring of the bearing (51) abuts against the valve stem (20). The valve stem (20) includes a small diameter portion (21) and a large diameter portion (22). The outer diameter of the large diameter portion (22) is larger than the outer diameter of the small diameter portion (21) so that a step (23) is formed between the large diameter portion (22) and the small diameter portion (21). The end face of the bearing (51) near the stationary valve core (40) abuts against the step (23).

3. The shut-off valve according to claim 2, characterized in that, The bearing (51) is a tapered roller bearing (511), and the outer wall of the tapered roller bearing (511) abuts against the inner wall of the valve tube (12). Alternatively, the bearing (51) may include a first bearing (512) and a thrust bearing (513), the first bearing (512) and the thrust bearing (513) being connected and disposed at the end of the thrust bearing (513) away from the stationary valve core (40), the first bearing (512) being rotatably in contact with the valve stem (20) and applying a force toward the central axis of the valve stem (20) to the valve stem (20), and the thrust bearing (513) abutting against the step (23) and applying a force toward the stationary valve core (40) to the step (23).

4. The shut-off valve according to claim 3, characterized in that, The bearing (51) is a tapered roller bearing (511), which includes an inner ring (5111), an outer ring (5112), and tapered rollers (5113) disposed between the inner ring (5111) and the outer ring (5112). The inner wall of the inner ring (5111) abuts against the valve stem (20). The end face of the inner ring (5111) near the stationary valve core (40) abuts against the step (23). The outer ring (5112) can generate an inclined force on the tapered rollers (5113) so that the inner ring (5111) applies a force toward the central axis of the valve stem (20) and a force toward the stationary valve core (40) to the valve stem (20).

5. The shut-off valve according to claim 3, characterized in that, The bearing (51) includes a first bearing (512), which is a needle roller bearing. The needle roller bearing includes a first shaft ring (5121), and a plurality of needle rollers (5122) are provided on the inner wall of the first shaft ring (5121). The needle rollers (5122) abut against the valve stem (20).

6. The shut-off valve according to claim 3, characterized in that, The bearing (51) includes a thrust bearing (513), the thrust bearing (513) includes a second shaft ring (5131), the end face of the second shaft ring (5131) facing the step (23) is provided with a needle roller (5122) or a ball, the needle roller (5122) or the ball and the step (23) abut against each other.

7. The shut-off valve according to claim 3, characterized in that, The bearing (51) includes a first bearing (512) and a thrust bearing (513), which are integrally formed.

8. The shut-off valve according to claim 3, characterized in that, The bearing (51) includes a first bearing (512) and a thrust bearing (513). The positioning structure (50) also includes a fixed seat (53). The fixed seat (53) is sleeved on the outside of the first bearing (512). The inner wall of the fixed seat (53) abuts against the first bearing (512), and the outer wall is connected to the valve pipe (12). The end of the fixed seat (53) near the stationary valve core (40) abuts against the thrust bearing (513).

9. The shut-off valve according to claim 2, characterized in that, The valve tube (12) has an opening (121) at one end. The positioning structure (50) also includes a retaining ring (52). The retaining ring (52) is located at the opening (121) and abuts against the end of the bearing (51) away from the stationary valve core (40). The side wall of the retaining ring (52) is fixedly connected to the inner wall of the valve tube (12).

10. The shut-off valve according to claim 1, characterized in that, The valve body assembly (10) also includes a cover (14) which covers the valve tube (12) and is connected to the valve tube (12).

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