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 a valve pipe of the valve body assembly, the static valve element is arranged at the valve port and provided with a communicating hole communicating with the valve port, the valve element assembly is arranged on the static valve element, and the valve element assembly can rotate to block or open the communicating hole; the stop valve further comprises a positioning assembly, the valve element assembly is sleeved with the positioning assembly, the positioning assembly is arranged in the valve pipe, the outer wall of the positioning assembly abuts against the inner wall of the valve pipe, and the inner wall of the positioning assembly abuts against the valve element assembly. The stop valve has the advantages that the valve element assembly can be limited to prevent the valve element assembly from deflecting in the long-term use process, and therefore inner leakage of the stop valve 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 body, a valve core assembly, and a stationary valve core. The stationary valve core is located at the valve port and communicates with it through a connecting hole. Rotating the valve core assembly seals the connecting hole, thus blocking the valve port. To reconnect the piping system, rotating the valve core assembly opens the connecting hole, allowing the gate valve to close or open.

[0003] In related technologies, during long-term use, the valve core assembly of a gate valve is prone to misalignment, resulting in a certain tilt angle between the axis of the valve core assembly and the axis of the stationary valve core. The valve core assembly and the stationary valve core cannot fit together completely, leading to internal leakage in the gate valve. Utility Model Content

[0004] In view of this, it is necessary to provide a shut-off valve that can reduce the possibility of misalignment of the valve core assembly in order to prevent internal leakage of the shut-off valve.

[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 inside the valve tube of the valve body assembly. The stationary valve core is located at the valve port and has a communicating hole communicating with the valve port. The valve core assembly is disposed on the stationary valve core and can rotate to block or open the communicating hole. The shut-off valve also includes a positioning assembly, which is sleeved outside the valve core assembly and disposed inside the valve tube. The outer wall of the positioning assembly abuts against the inner wall of the valve tube, and the inner wall of the positioning assembly abuts against the valve core assembly.

[0006] This configuration positions and limits the valve core assembly, preventing it from becoming misaligned and thus failing to fully fit the stationary valve core, thereby preventing internal leakage in the shut-off valve.

[0007] In one embodiment, the valve core assembly includes a valve stem, and the positioning assembly includes a fixed seat and a bearing, wherein the inner wall of the bearing abuts against the valve stem, and the outer wall of the bearing abuts against the fixed seat.

[0008] This design, with the bearing in contact with the valve stem, reduces friction during valve stem rotation.

[0009] In one embodiment, the positioning assembly includes a fixed seat, the valve core assembly includes a valve stem, the valve stem passes through the fixed seat, the outer wall of the valve stem has a contact portion, the contact portion protrudes relative to the outer wall of the valve stem, and the inner wall of the fixed seat abuts against the contact portion.

[0010] With this configuration, the fixed seat abuts against the contact part, which serves to position the valve stem.

[0011] In one embodiment, the positioning assembly includes a fixed seat and a thrust member. The fixed seat is disposed on the thrust member and abuts against the thrust member. The valve core assembly includes a valve stem. The valve stem passes through the fixed seat and the thrust member in sequence. The valve stem is in clearance fit with the inner wall of the fixed seat and at least partially abuts against the inner wall of the thrust member.

[0012] This design not only reduces friction when the valve stem rotates, but also positions the valve stem.

[0013] In one embodiment, the positioning component further includes a retaining ring, which is disposed at the end of the fixed seat away from the stationary valve core and abuts against the fixed seat. One end of the valve tube is open, and the retaining ring is disposed at the opening and connected to the valve tube.

[0014] Understandably, the retaining ring is used to limit the movement of the fixed seat.

[0015] In one embodiment, the end of the retaining ring near the stationary valve core extends toward the stationary valve core to form a first stop portion, the inner wall of the first stop portion abutting against at least a portion of the outer wall of the fixing seat.

[0016] With this configuration, the retaining ring limits the valve stem via the fixed seat.

[0017] In one embodiment, the retaining ring has a receiving groove at one end facing the stationary valve core, and a spring piece is provided in the receiving groove. The end face of the fixing seat away from the stationary valve core has a protrusion, which extends into the inner ring of the spring piece. When the retaining ring presses the spring piece, the side wall of the receiving groove presses the spring piece so that the spring piece abuts against the protrusion and applies a spring force to the fixing seat toward the central axis of the valve stem.

[0018] In one embodiment, one end of the fixed seat extends toward the stationary valve core to form a second stop portion, the positioning assembly includes a thrust member disposed at one end of the fixed seat near the stationary valve core and abutting against the fixed seat, the thrust member being sleeved on the valve stem, and the inner wall of the second stop portion abutting against at least a portion of the outer wall of the thrust member.

[0019] This configuration allows for the limiting of the thrust component.

[0020] In one embodiment, the positioning component and the valve port are concentrically arranged, and the stationary valve core and the valve port are concentrically arranged.

[0021] This configuration ensures that the positioning component and the stationary valve core are concentric, thereby enabling the moving valve core to effectively block the connecting hole.

[0022] In one embodiment, the valve body assembly further includes a cover that covers and connects to the valve tube. The cover has an installation plate inside, and the installation plate has a limiting groove on its side facing the valve core assembly. One end of the valve core assembly extends into the limiting groove and abuts against the groove wall.

[0023] This configuration limits the valve core assembly at the other end, further enhancing its limiting effect.

[0024] This utility model sets up a positioning component, which is located outside the valve core assembly and wraps around it, thereby limiting and positioning the valve core assembly, enhancing the concentricity of the valve core assembly, preventing the valve core assembly from becoming misaligned during long-term use and failing to fit the stationary valve core, and preventing the medium from leaking from the gap between the two, thus effectively preventing internal leakage of the shut-off valve. Attached Figure Description

[0025] 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.

[0026] Figure 1 A cross-sectional view of a shut-off valve in Embodiment 1 of this utility model, wherein the fixed base is not connected to the valve pipe;

[0027] Figure 2 for Figure 1 A magnified view of a portion at point A;

[0028] Figure 3 This is a cross-sectional view of the shut-off valve with the fixed seat and valve pipe threaded connection in Embodiment 1;

[0029] Figure 4 This is a cross-sectional view of the shut-off valve in Embodiment 1, in which the fixed seat and the retaining ring are integrally formed.

[0030] Figure 5 This is a cross-sectional view of the shut-off valve in Embodiment 2;

[0031] Figure 6 This is a cross-sectional view of the shut-off valve in Embodiment 3.

[0032] Reference numerals: 100, gate valve; 10, valve body assembly; 11, valve port; 12, valve pipe; 121, opening; 122, threaded ring; 13, valve seat; 14, cover; 141, main body; 142, connecting sleeve; 143, mounting plate; 144, limiting groove; 20, valve stem; 21, small diameter section; 22, large diameter section; 23, step; 24, contact section; 30, moving valve core; 40, stationary valve core; 41, connecting hole; 50, positioning assembly; 51, retaining ring; 511, receiving groove; 512, first stop section; 52, fixed seat; 521, protrusion; 522, second stop section; 53, bearing; 54, spring; 541, conical surface; 55, thrust member; 551, first shaft ring; 552, second shaft ring; 553, ball; 60, valve core assembly. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Please see Figures 1-6 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.

[0039] Specifically, please see Figure 1 The shut-off valve 100 includes a valve body assembly 10, a valve core assembly 60, and a stationary valve core 40. The valve body assembly 10 has a valve port 11. The valve core assembly 60 and the stationary valve core 40 are disposed in the valve body assembly 10. The stationary valve core 40 is located at the valve port 11 and has a communication hole 41 that communicates with the valve port 11. The valve core assembly 60 is disposed on the stationary valve core 40 and can rotate to open or block the communication hole 41.

[0040] 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 configured. After being processed and formed separately, the valve seat 13 and the valve tube 12 are connected by laser welding. By disassembling the valve body assembly 10 into the valve seat 13 and the valve tube 12 according to their corresponding functions and processing them separately, difficult processing processes such as internal bending can be reduced, thereby reducing the processing difficulty.

[0041] Valve body assembly 10 also includes a cover 14, which covers and is connected to valve tube 12.

[0042] The cover 14 includes a separate 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 main body 141 and the connecting sleeve 142 are fixedly connected after being processed and formed, which can reduce the processing difficulty.

[0043] The valve tube 12, connecting sleeve 142 and shell cover 14 are all made of stainless steel and are connected by laser welding. Laser welding has high energy density, small heat zone influence and fast welding speed, which can improve processing efficiency.

[0044] The valve tube 12 has an opening 121 at one end near the housing cover 14. One end of the valve core assembly 60 is located inside the valve tube 12, and the other end extends out of the opening 121 and into the housing cover 14.

[0045] The shut-off valve 100 also includes a positioning component 50, which is sleeved outside the valve core assembly 60 and located in the valve tube 12. The inner wall of the positioning component 50 abuts against the valve core assembly 60, and the outer wall abuts against the inner wall of the valve tube 12. It is used for positioning and limiting the valve core assembly 60, thereby enhancing the sealing performance of the valve core assembly 60 in blocking the connecting hole 41. Understandably, during long-term use, the valve core assembly 60 is prone to misalignment, causing its axis to be non-parallel to the axis of the stationary valve core 40. This prevents the valve core assembly 60 from fitting properly with the stationary valve core 40 and from completely sealing the connecting hole 41, leading to internal leakage in the shut-off valve 100. By setting the positioning component 50, the valve core assembly 60 is limited, thus preventing misalignment.

[0046] In one embodiment, the positioning component 50 and the valve port 11 are concentrically arranged, and the stationary valve core 40 and the valve port 11 are also concentric, thereby ensuring that the valve core assembly 60 and the stationary valve core 40 are concentric, ensuring that the central axis of the valve core assembly 60 and the central axis of the stationary valve core 40 are collinear, preventing the valve core assembly 60 from shifting relative to the stationary valve core 40, and ensuring that the valve core assembly 60 can fit properly against the stationary valve core 40. In other embodiments, if the stationary valve core 40 and the valve port 11 are eccentric, then the positioning component 50 and the valve port 11 are eccentrically arranged.

[0047] The valve core assembly 60 includes a valve stem 20 and a movable valve core 30. One end of the valve stem 20 is connected to the movable valve core 30, and the movable valve core 30 is placed on and in contact with the stationary valve core 40. In one embodiment, the inner wall of the positioning component 50 abuts against the valve stem 20. In other embodiments, the positioning component 50 may also abut against the movable valve core 30, or simultaneously abut against both the valve stem 20 and the movable valve core 30.

[0048] Please see Figure 3 The valve stem 20 includes a large-diameter portion 22 and a small-diameter portion 21 connected to each other. The diameter of the large-diameter portion 22 is larger than the 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 positioning component 50 abuts against the step 23, thereby limiting the valve stem 20 in the axial direction and ensuring that the stationary valve core 40 and the moving valve core 30 fit tightly together.

[0049] The positioning assembly 50 includes a retaining ring 51 and a fixing seat 52. The retaining ring 51 is located at the opening 121 and connected to the inner wall of the opening 121. The fixing seat 52 is located inside the valve pipe 12 and abuts against the retaining ring 51. The valve stem 20 passes through the retaining ring 51 and the fixing seat 52.

[0050] Example 1

[0051] Please participate Figures 1-4 The positioning assembly 50 also includes a bearing 53, the inner wall of which abuts against the valve stem 20, and the outer wall of which abuts against the fixed seat 52. The bearing 53 may be a needle roller bearing or a ball bearing to reduce the frictional force when the valve stem 20 rotates.

[0052] Please see Figure 3 In one embodiment, a threaded ring 122 is provided inside the valve tube 12, and the fixing seat 52 is threadedly connected to the valve tube 12 through the threaded ring 122. The retaining ring 51 is welded to the opening 121 to prevent the fixing seat 52 from loosening and coming out.

[0053] Please see Figure 1 In another embodiment, the fixed seat 52 is not connected to the valve pipe 12, and the retaining ring 51 and the valve pipe 12 are connected by pressure welding. One end of the retaining ring 51 extends toward the stationary valve core 40 to form a first stop portion 512. The first stop portion 512 covers at least part of the fixed seat 52, and the inner side of the first stop portion 512 abuts against the outer wall of part of the fixed seat 52 to ensure that the fixed seat 52 and the retaining ring 51 are concentric.

[0054] Please see Figure 4 In another embodiment, the fixing seat 52 and the retaining ring 51 are integrally formed and are connected to the valve pipe 12 by pressure welding.

[0055] The retaining ring 51, the fixed seat 52 and the bearing 53 are concentrically arranged, and the valve stem 20 is located inside the bearing 53, thereby limiting the central axis of the valve stem 20 to the center line of the stationary valve core 40.

[0056] The positioning assembly 50 also includes a spring 54, which is disposed between the retaining ring 51 and the fixed seat 52, or between the fixed seat 52 and the valve stem 20. The retaining ring 51 and / or the fixed seat 52 can generate pressure to squeeze the spring 54, and the spring 54 generates a downward elastic force on the valve stem 20, thereby making the moving valve core 30 and the stationary valve core 40 fit tightly in the axial direction, while compensating for the displacement loss of the moving valve core 30 and / or the stationary valve core due to wear.

[0057] The spring 54 is a disc-shaped spring with a conical surface 541. The outer side of the conical surface 541 faces the stationary valve core 40. The pressure of the retaining ring 51 and / or the fixed seat 52 compresses the disc-shaped spring 54, causing it to deform. Its conical surface 541 then presses downward against the fixed seat 52 or the valve stem 20.

[0058] Please see Figure 2 In one embodiment, the retaining ring 51 has a receiving groove 511 on the end face facing the stationary valve core 40, and the spring piece 54 is disposed in the receiving groove 511. The fixed seat 52 has a protrusion 521 on the end face away from the stationary valve core 40. The protrusion 521 extends into the inner ring of the spring piece 54. When the retaining ring 51 generates pressure to squeeze the spring piece 54, the spring piece 54 simultaneously squeezes the protrusion 521 inward, limiting the fixed seat 52.

[0059] The positioning assembly 50 also includes a thrust member 55, which is sleeved on the valve stem 20 and used to transmit axial force to the large-diameter portion 22. The aforementioned spring 54 may also be disposed between the thrust member 55 and the large-diameter portion 22. The thrust member 55 may be a thrust bearing, a gasket, or other force-transmitting component.

[0060] One end of the fixing seat 52 extends toward the large diameter portion 22 to form a second stop portion 522. The second stop portion 522 abuts against the thrust member 55, such that the fixing seat 52 at least partially encloses the thrust member 55. The inner side of the second stop portion 522 abuts against at least part of the outer wall of the thrust member 55. The second stop portion 522 plays a limiting role for the thrust member 55.

[0061] Preferably, the thrust member 55 is a thrust bearing, which includes a first shaft ring 551, a second shaft ring 552 and a ball 553. The first shaft ring 551 abuts against the fixed seat 52, the outer wall of the first shaft ring 551 abuts against the second stop portion 522, and the ball 553 is disposed between the first shaft ring 551 and the second shaft ring 552.

[0062] The inner wall of the first shaft ring 551 is clearance-fitted with the valve stem 20, and the inner wall of the second shaft ring 552 abuts against the valve stem 20. This not only reduces the frictional force when the valve stem 20 rotates, but also further positions the valve stem 20. Alternatively, the inner walls of both the first shaft ring 551 and the second shaft ring 552 abut against the valve stem 20, strengthening the limiting effect on the valve stem 20. In other embodiments, the inner walls of the first shaft ring 551 and the second shaft ring 552 are clearance-fitted with the valve stem 20 to reduce the frictional force when the valve stem 20 rotates.

[0063] Example 2

[0064] This embodiment is basically the same as Embodiment 1, and the similarities will not be repeated. The differences are as follows:

[0065] Please see Figure 5 The inner wall of the fixed seat 52 and the valve stem 20 are fitted with a clearance to reduce the friction when the valve stem 20 rotates.

[0066] The inner ring of the thrust member 55 at least partially abuts against the valve stem 20 to position the valve stem 20.

[0067] The inner wall of the first shaft ring 551 and the small diameter portion 21 are in clearance fit, and the inner wall of the second shaft ring 552 abuts against the small diameter portion 21. This not only reduces the frictional force when the valve stem 20 rotates, but also positions the valve stem 20. Alternatively, the inner walls of both the first shaft ring 551 and the second shaft ring 552 abut against the valve stem 20, thereby strengthening the limiting effect on the valve stem 20.

[0068] Example 3

[0069] This embodiment is basically the same as Embodiment 1, and the similarities will not be repeated. The differences are as follows:

[0070] Please see Figure 6 No bearing 53 is provided between the fixed seat 52 and the valve stem 20. The outer wall of the valve stem 20 is provided with a contact part 24. The contact part 24 is located on the outer wall of the small diameter part 21 and protrudes relative to the outer wall of the small diameter part 21. The inner wall of the fixed seat 52 abuts against the contact part 24, thereby positioning the valve stem 20.

[0071] In one embodiment, a sealing groove is formed on the outer wall of the valve stem 20, and the contact portion 24 is a sealing element disposed within the sealing groove, which performs a sealing function. In other embodiments, the contact portion 24 may also be a protrusion integrally formed with the valve stem 20.

[0072] Preferably, the seal is an O-ring, which reduces the contact area between the fixed seat 52 and the seal, thus reducing the rotational friction of the valve stem 20. Of course, the seal can also be a gasket.

[0073] 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.

[0074] The cover 14 has a mounting plate 143 inside, and the motor is mounted on the mounting plate 143. The mounting plate 143 has a limiting groove 144 on the side facing the valve stem 20. The valve stem 20 extends into the limiting groove 144 and abuts against the groove wall of the limiting groove 144. That is, the outer side wall of the valve stem 20 abuts against the side wall of the limiting groove 144, thereby further limiting the valve stem 20.

[0075] During use, one end of the positioning component 50 abuts against the large diameter portion 22, and the positioning component 50 abuts against the inner wall of the valve pipe 12. The positioning component 50 limits the valve stem 20. Due to the limitation of the positioning component 50, the valve stem 20 cannot tilt or move radially, and the moving valve core 30 can fit in place with the stationary valve core 40 to prevent internal leakage of the shut-off valve 100.

[0076] 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.

[0077] 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 (60), and a stationary valve core (40), wherein the valve body assembly (10) has a valve port (11), the valve core assembly (60) and the stationary valve core (40) are disposed within a valve tube (12) of 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), the valve core assembly (60) is disposed on the stationary valve core (40), and the valve core assembly (60) is rotatable to block or open the communication hole (41); Its features are, The shut-off valve also includes a positioning component (50), which is sleeved outside the valve core assembly (60) and located inside the valve tube (12). The outer wall of the positioning component (50) abuts against the inner wall of the valve tube (12), and the inner wall of the positioning component (50) abuts against the valve core assembly (60).

2. The shut-off valve according to claim 1, characterized in that, The valve core assembly (60) includes a valve stem (20), and the positioning assembly (50) includes a fixed seat (52) and a bearing (53). The inner wall of the bearing (53) abuts against the valve stem (20), and the outer wall of the bearing (53) abuts against the fixed seat (52).

3. The shut-off valve according to claim 1, characterized in that, The positioning component (50) includes a fixed seat (52), and the valve core component (60) includes a valve stem (20). The valve stem (20) passes through the fixed seat (52), and the outer wall of the valve stem (20) is provided with a contact portion (24). The contact portion (24) protrudes relative to the outer wall of the valve stem (20), and the inner wall of the fixed seat (52) abuts against the contact portion (24).

4. The shut-off valve according to claim 1, characterized in that, The positioning component (50) includes a fixed seat (52) and a thrust member (55). The fixed seat (52) is disposed on the thrust member (55) and abuts against the thrust member (55). The valve core assembly (60) includes a valve stem (20). The valve stem (20) passes through the fixed seat (52) and the thrust member (55) in sequence. The valve stem (20) is clearance-fitted with the inner wall of the fixed seat (52) and at least partially abuts against the inner wall of the thrust member (55).

5. The shut-off valve according to any one of claims 2-4, characterized in that, The positioning component (50) further includes a retaining ring (51), which is located at the end of the fixed seat (52) away from the static valve core (40) and abuts against the fixed seat (52). One end of the valve tube (12) is open (121), and the retaining ring (51) is located at the opening (121) and connected to the valve tube (12).

6. The shut-off valve according to claim 5, characterized in that, The retaining ring (51) extends toward the stationary valve core (40) at one end to form a first stop portion (512), the inner wall of the first stop portion (512) abutting against at least part of the outer wall of the fixing seat (52).

7. The shut-off valve according to claim 5, characterized in that, The retaining ring (51) has a receiving groove (511) at one end facing the stationary valve core (40). A spring piece (54) is provided in the receiving groove (511). The end face of the fixed seat (52) away from the stationary valve core (40) has a protrusion (521). The protrusion (521) extends into the inner ring of the spring piece (54). When the retaining ring (51) presses the spring piece (54), the side wall of the receiving groove (511) presses the spring piece (54) so ​​that the spring piece (54) abuts against the protrusion (521) and applies a spring force to the fixed seat (52) toward the central axis of the valve stem (20).

8. The shut-off valve according to any one of claims 2-4, characterized in that, One end of the fixed seat (52) extends toward the stationary valve core (40) to form a second stop (522). The positioning assembly (50) includes a thrust member (55), which is disposed at one end of the fixed seat (52) near the stationary valve core (40) and abuts against the fixed seat (52). The inner wall of the second stop (522) abuts against at least a portion of the outer wall of the thrust member (55).

9. The shut-off valve according to claim 1, characterized in that, The positioning component (50) and the valve port (11) are concentrically arranged, and the static valve core (40) and the valve port (11) are concentrically arranged.

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 fixedly connected to the valve tube (12). The cover (14) has an installation plate (143) inside, and the installation plate (143) has a limiting groove (144) on the side facing the valve core assembly (60). One end of the valve core assembly (60) extends into the limiting groove (144) and abuts against the groove wall of the limiting groove (144).

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