Stop valve and its cooling system

Abstract

The valve body (10) includes a hollow valve body (10), the valve body (10) having a valve seat (17) therein and a valve port (171) formed in the valve seat (17), and a valve core (20), at least a portion of the valve core (20) is provided inside the valve body (10) and is movable along the axial direction of the valve body (10) so as to seal or unseal the valve port (171), the valve core (20) being connected to each other by a connecting portion (20). a stop valve including a connecting portion (22) and a guide portion (23), the guide portion (23) being provided at one end adjacent to the valve port (171) of the connecting portion (22) and capable of entering the valve port (171), a third sealing member (233) being provided at one end adjacent to the guide portion (23) of the connecting portion (22), the third sealing member (233) being capable of abutting against the valve seat (17), and at least a portion of the guide portion (23) being abutted against and supported by the third sealing member (233). Such a stop valve is directly abutted against and supported by the third sealing member by the guide portion, thereby realizing a hard seal of the valve core and avoiding the problem that the third sealing member is easily detached.

Description

Technical Field

[0001] Related Applications This application claims the priority of a Chinese patent application with the application number 202123218681.3 and the invention title "Stop Valve and Its Cooling System", which was filed on December 18, 2021, and all of its contents are incorporated herein by reference.

[0002] This application relates to the technical field of cooling, and particularly to a stop valve and its cooling system.

Background Art

[0003] In a cooling system, a stop valve is used to perform important functions of cutting off and throttling the medium in the pipeline where it is located. The opening and closing member of the stop valve is a valve core, which is mainly applied to the cutoff of the medium in a low-temperature environment. [[ID=二十]]

[0004] [[ID=二十一]] [[ID=二十二]] [[ID=二十三]] [[ID=二十四]] [[ID=二十五]]

[0005] [[ID=二十六]] [[ID=二十九]]This application provides a stop valve, and the technical solution is as follows. [[ID=三十]] [[ID=三十一]]

[0006] [[ID=三十二]] It should be noted that there seem to be some incorrect line number references in your original text (such as "二十", "二十一", "二十二", "二十三", "二十四", "二十五", "二十六", "二十九", "三十", "三十一", "三十二"). I have translated it as accurately as possible based on the overall context. If you can correct these line number references, it will be more conducive to a better translation result.​A shut-off valve comprising a hollow valve body having a valve seat inside, the valve seat having a valve opening, and a valve core, at least a portion of which is located inside the valve body and movable along the axial direction of the valve body to seal or release the valve opening, wherein the valve core includes a connecting portion and a guide portion connected to each other, the guide portion being provided at one end of the connecting portion adjacent to the valve opening and being able to enter into the valve opening, a third sealing member being provided at the other end of the connecting portion adjacent to the guide portion, the third sealing member being able to contact the valve seat, and the guide portion being at least a portion of which is in contact with and supported by the third sealing member.

[0007] This design restricts the third sealing member to the inside of the connection, thus avoiding the problem of the third sealing member easily falling off.

[0008] In one embodiment, the area of ​​the guide portion that contacts and is supported by the third sealing member accounts for 15% to 50% of the area of ​​the side surface of the third sealing member facing the valve opening.

[0009] This design ensures that the guide portion provides a limiting force on the third sealing member, preventing the third sealing member from falling off. It also saves material in the guide portion and allows sufficient space to be pre-secured for the third sealing member to contact the valve seat.

[0010] In one embodiment, the area of ​​the guide portion that contacts and is supported by the third sealing member accounts for 30% to 40% of the area of ​​the side surface of the third sealing member facing the valve opening.

[0011] In one embodiment, the guide portion and the connecting portion are provided separately.

[0012] With this design, the guide section can be assembled after the installation of the third sealing member is complete and supported in contact with the third sealing member. Furthermore, by providing the guide section as a separate part, the connecting section and the guide section can be machined separately, reducing the amount of material removed and improving machining efficiency.

[0013] In one embodiment, a second groove is provided on one side of the connecting portion facing the guide portion, and the guide portion includes a first segment and a projection, the first segment is provided at one end of the projection facing the connecting portion and is fitted into the second groove and connected to the inner wall of the second groove, and the projection is connected to one side of the first segment away from the connecting portion and can enter into the valve opening.

[0014] In one embodiment, a second groove is provided on one side of the guide portion facing the connection portion, and one end of the connection portion is fitted into the second groove and connected to the inner wall of the second groove.

[0015] In one embodiment, a second groove is provided on one side of the connecting portion facing the guide portion, and the guide portion is pin-connected or screwed into the inner wall of the second groove.

[0016] In one embodiment, a second groove is drilled on one side of the guide portion facing the connection portion, and the connection portion is pin-connected or screwed into the inner wall of the second groove.

[0017] This design ensures the connection strength between the guide portion and the second groove through pin connection or screwing, and its detachability facilitates the removal and installation of the third sealing member.

[0018] In one embodiment, when the third sealing member is in contact with the end face of the valve seat facing the connection portion, the depth to which the guide portion enters the valve opening is at least 1 mm.

[0019] This design ensures sufficient engagement strength and sealing performance between the guide and the valve opening, preventing the valve core from insufficiently sealing the valve opening due to insufficient insertion.

[0020] In one embodiment, the inner diameter of the valve opening is provided to correspond to the outer diameter of the guide portion, and the outer wall of the guide portion abuts against the inner wall of the valve opening.

[0021] With such a design, the guide part can guide the valve core to be inserted into the valve port, avoiding eccentricity, and by making the guide part contact the inner wall of the valve port, the sealing performance can be enhanced.

[0022] In one embodiment, the material of the third sealing member is pure copper or plastic.

[0023] With such a design, pure copper and plastic can ensure strength while having a certain flexibility, thereby enhancing the sealing performance.

[0024] This application further provides a cooling system including the above stop valve.

[0025] Details of one or more embodiments of this application are described in the following drawings and description. Other features, objects, and advantages of this application will become apparent from the specification, drawings, and claims.

Brief Description of Drawings

[0026] To better describe and explain the embodiments and / or exemplifications of these inventions disclosed herein, one or more drawings can be referred to. Additional details or exemplifications used to explain the drawings should not be considered as limiting the scope of any of the disclosed inventions, the embodiments and / or exemplifications described herein, and the optimal forms of these inventions understood herein.

[0027] [Figure 1] It is a cross-sectional view of an embodiment of the stop valve provided in this application. [Figure 2] It is a cross-sectional view of an embodiment of the stop valve provided in this application. [Figure 3] It is a front view of the valve core of an embodiment of the stop valve provided in this application. [Figure 4] It is a cross-sectional view of the valve core of an embodiment of the stop valve provided in this application. [Figure 5] It is a perspective view of the stop valve provided in this application. [Figure 6]This is a front view of the stop valve provided in this application. [Figure 7] This is a top view of the stop valve provided in this application. [Figure 8] This is a left side view of the stop valve provided in this application.

[0028] The meaning of each symbol in the diagram is as follows: 100 Stop valve, 10 Valve body, 11 First opening, 111 Annular projection, 12 Second opening, 13 First connecting pipe, 14 Second connecting pipe, 15 End cover, 151 Second threaded segment, 16 Body, 17 Valve seat, 171 Valve port, 20 Valve core, 21 Operating section, 211 First threaded segment, 22 Connecting section, 221 First groove, 222 Second groove, 23 Guide section, 231 First segment, 232 Protrusion, 233 Third sealing member, 25 First sealing member, 26 Second sealing member, 30 Valve assembly, 31 Housing, 32 Fourth sealing member, 33 Connecting body, 34 Elastic member, 35 Valve core. [Modes for carrying out the invention]

[0029] The technical aspects of the embodiments of this application will be described clearly and completely below with reference to the drawings of the embodiments of this application, although it is clear that the embodiments described are only a selection of embodiments of this application and not all embodiments. All other embodiments that a person skilled in the art could obtain without creative effort based on the embodiments of this application shall all fall within the scope of protection of this application.

[0030] It should be noted that when an assembly is described as being "attached" to another assembly, it may be directly attached to the other assembly, or there may be an intervening assembly. When one assembly is described as being "provided" to another assembly, it may be directly provided to the other assembly, or there may be an intervening assembly simultaneously. When one assembly is described as being "fixed" to another assembly, it may be directly fixed to the other assembly, or there may be an intervening assembly simultaneously.

[0031] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the art relating to this application. Terms used in the specification of this application are for illustrative purposes only and are not intended to limit this application. The terms "or / and" used in this application include any and all combinations of the relevant enumerated items.

[0032] Referring to Figures 1 and 2, the shut-off valve 100 is installed in the cooling system and used to enable and disable the piping.

[0033] The stop valve 100 includes a valve body 10 and a valve core 20, the valve body 10 being connected to the valve core 20. The inside of the valve body 10 is hollow and used to house components such as the valve core 20, and at least a portion of the valve core 20 is provided inside the valve body 10 and is movable along the axial direction of the valve body 10.

[0034] The valve body 10 is further provided with a first opening 11 and a second opening 12. In this embodiment, when the stop valve 100 is mounted vertically as shown in the drawings of the specification (when directional terms such as up, down, left, and right are involved, the stop valve 100 is considered to be mounted vertically, and the explanation is omitted below), the first opening 11 and the second opening 12 are drilled on the lower and right sides of the valve body 10. A first connecting pipe 13 is connected to one side of the first opening 11 away from the valve body 10, and the first opening 11 is in communication with the outside world by the first connecting pipe 13. A second connecting pipe 14 is connected to one side of the second opening 12 away from the valve body 10, and the second opening 12 is in communication with the outside world by the second connecting pipe 14. The first connecting pipe 13 and the second connecting pipe 14 serve as the inlet or outlet of the medium, respectively. When the first connecting pipe 13 is the inlet for the medium, the medium enters the stop valve 100 from the first connecting pipe 13, enters the inside of the valve body 10 through the first opening 11, and when the stop valve 100 is open, the medium flows out of the stop valve 100 through the second opening 12 and the second connecting pipe 14. Conversely, the medium may enter the valve body 10 from the second connecting pipe 14 through the second opening 12, and then flow out of the stop valve 100 through the first opening 11 and the first connecting pipe 13.

[0035] Selectively, the positions of the first opening 11 and the second opening 12 are not limited to being drilled on the lower and right sides of the valve body 10 in this embodiment. In other embodiments, the first opening 11 and the second opening 12 may be provided on both the left and right sides, the top and bottom sides, etc. of the valve body 10, as long as communication or blockage between the two valve openings can be achieved by the axial movement of the valve core 20.

[0036] The valve body 10 further includes a body 16, an end cover 15, and a valve seat 17. In one embodiment of this application, the body 16 is located on one side of the valve body 10 away from the first opening 11, is positioned opposite the first opening 11, and is coaxial with the first opening 11. The body 16 restricts the valve core 20 so that the valve core 20 moves axially along the body 16, thereby enabling switching between the open and closed states of the stop valve 100. The end cover 15 is located at the uppermost end of the body 16 and engages with the valve core 20 to seal the valve body 10, thereby preventing external dust and powders from entering the valve body 10 and affecting the sealing performance of the stop valve 100 and the purity of the medium entering the valve body 10, as well as preventing them from affecting the realization of other related functions of the stop valve 100. The valve seat 17 is provided within the main body 16 and is in contact with and engaged with the valve core 20 to achieve communication or blockage inside the valve body 10. In this embodiment, the valve seat 17 is provided in the first opening 11, while in other embodiments, the valve seat 17 may be provided between the first opening 11 and the second opening 12.

[0037] Selectively, the end cover 15 may be provided inside the main body 16, that is, by providing it so that the outer circumference of the end cover 15 abuts against the inner circumference of the main body 16 and the inner circumference of the end cover 15 abuts against the outer circumference of the valve core 20, the engagement between the end cover 15 and the valve core 20 can similarly perform the function of sealing the valve body 10. The position of the end cover 15 is not limited to the configuration described in this embodiment, as long as it can achieve the above function.

[0038] A valve opening 171 is provided in the valve seat 17, and the valve opening 171 and the first opening 11 are in communication, together forming a passage through which the medium flows in or out. In some embodiments, in this embodiment, the valve seat 17 and the valve body 10 are provided separately in order to reduce the difficulty of manufacturing. Selectively, in other embodiments, the valve seat 17 may be directly formed by the valve body 10.

[0039] Referring to Figures 3 and 4, the valve core 20 includes an operating section 21, a connecting section 22, and a guide section 23. The connecting section 22 is connected to one end of the operating section 21, with the other end protruding from the end cover 15. The connecting section 22 is located between the operating section 21 and the guide section 23, connecting the operating section 21 and the guide section 23. The guide section 23 is connected to one end of the connecting section 22 away from the operating section 21 and moves axially together with the operating section 21 and the connecting section 22. The connecting section 22 and the guide section 23 are provided as separate components and are machined separately to reduce machining time and material removal, thereby lowering costs.

[0040] The upper end surface of the operating section 21, which protrudes from the end cover 15, is easy to process and remove. The operating section 21 has a hollow structure with an open upper end, and multiple planes are distributed at uniform intervals on the inner surface of the operating section 21 to accommodate tools such as internal hex wrenches. In other embodiments, the planes on the inner surface of the operating section 21 may be provided at uneven intervals to accommodate wrenches of irregular shapes.

[0041] The connecting portion 22 is located between the operating portion 21 and the guide portion 23, and is linked to the operating portion 21, rotating synchronously with the operating portion 21. The operating portion 21 has a first screw segment 211 on its outer circumference, and the valve body 10 has a second screw segment 151 that engages with the first screw segment 211 on its inner surface. During operation, the operating portion 21 is operated by an external machine or tool to rotate, which in turn links the first screw segment 211 to rotate in the circumferential direction. The first screw segment 211 and the second screw segment 151 engage, causing the operating portion 21 to perform an axial up-and-down movement. The operating portion 21 then links the connecting portion 22 connected to it, and the connecting portion 22 further links the guide portion 23 connected to it, ultimately achieving axial movement of the valve core 20.

[0042] In some embodiments, the second thread segment 151 may be provided on the inner surface of the end cover 15, and the second thread segment 151 on the inner circumference of the end cover 15 and the first thread segment 211 on the outer circumference of the operating part 21 engage to move the connecting part 22 in the axial direction.

[0043] The connecting portion 22 is connected to one end of the operating portion 21 facing the valve opening 171, and the outer wall of the connecting portion 22 abuts against the inner wall of the main body 16, allowing the valve core 20 to move axially along the inner wall of the main body 16. The diameter of the connecting portion 22 is larger than the diameter of the operating portion 21 so that a step is formed between the connecting portion 22 and the operating portion 21, and a first sealing member 25 is provided at the step, and the first sealing member 25 can abut against one side of the end cover 15 that is close to the connecting portion 22. When the valve core 20 moves toward the end cover 15 and reaches its limit position, that is, when the first sealing member 25 abuts against the end cover 15, the first sealing member 25 can perform a cushioning action and strengthen the sealing between the two.

[0044] A second sealing member 26 is further provided at one end of the connection portion 22 adjacent to the operating portion 21. The second sealing member 26 surrounds the outer circumference of the connection portion 22 in the circumferential direction, and the outer circumference of the second sealing member 26 abuts against the inner wall of the main body 16 in the circumferential direction, thereby sealing the valve body 10 and preventing leakage as the medium flows through the first opening 11 and the second opening 12. In other embodiments, the second sealing member 26 may be replaced with a gasket or other member that can similarly perform a sealing function.

[0045] A first groove 221 and a second groove 222 are provided at one end of the connecting portion 22 that is close to the valve opening 171. The second groove 222 is located at the end of the connecting portion 22 that is close to the valve opening 171 and is used to connect the guide portion 23. The first groove 221 is located at the end face where the groove opening of the second groove 222 that faces the valve opening 171 is located, surrounding the first groove 221, and the third sealing member 233 is fitted into it.

[0046] In some embodiments, the second groove 222 is a cylindrical groove, and the second groove 222, the connecting portion 22, and the guide portion 23 are coaxial. Selectively, in other embodiments, the second groove 222 may have another shape, such as a cubic shape, as long as it can engage with and connect to the guide portion 23.

[0047] In some embodiments, the first groove 221 is an annular groove and is provided surrounding the second groove 222. The shape and depth of the first groove 221 should be adjusted based on the shape and dimensions of the third sealing member 233, that is, after the third sealing member 233 is fitted into the first groove 221, it is necessary to ensure that the third sealing member 233 can contact the valve seat 17 and seal the valve opening 171 when the stop valve 100 is closed.

[0048] The guide portion 23 is located at the end of the connecting portion 22 adjacent to the first opening 11 and is used to guide the valve core 20 so that it is inserted into the valve port 171, thereby achieving a sealed engagement between the valve core 20 and the valve port 171.

[0049] The guide portion 23 includes a first segment 231 and a projection 232. The first segment 231 is located on one side of the guide portion 23 adjacent to the connection portion 22 and is used to securely connect the guide portion 23 to the connection portion 22. The projection 232 is located on one side of the guide portion 23 facing the valve opening 171 and is used to guide the valve core 20 so that it is inserted into the valve opening 171.

[0050] Referring to Figure 1, in one embodiment of this application, the first segment 231 and the projection 232 are provided separately. With this design, the guide portion 23 can be assembled after the installation of the third sealing member 233 is complete and then brought into contact with and supported by the third sealing member 233. Furthermore, by providing them separately, the connecting portion 22 and the guide portion 23 can be machined separately, reducing the amount of material removed and improving machining efficiency.

[0051] Referring to Figure 2, in one embodiment, the stability of the valve core 20 structure is increased by integrally providing the first segment 231 and the projection 232.

[0052] Specifically, the first segment 231 is fitted into the second groove 222 and connected to the inner wall of the second groove 222 by pins or screws. The connection configuration between the first segment 231 and the second groove 222 is not limited to the configuration described in this embodiment; any configuration that can achieve a fixed connection between the guide portion 23 and the connection portion 22 is acceptable.

[0053] In other embodiments, a second groove 222 may be further formed in the guide portion 23, and one end of the connecting portion 22 may be inserted into the second groove 222 and connected to the inner wall of the second groove 222. The connection configuration in such embodiments is the same as the connection configuration described above, and will not be explained here.

[0054] The projection 232 is supported in contact with the third sealing member 233. After the third sealing member 233 is fitted into the first groove 221, it is restricted in the circumferential direction of the first groove 221, and one side facing the valve opening 171 is restricted in contact with the projection 232. In other words, all four directions of the third sealing member 233 are effectively restricted, making it difficult for it to fall out of the first groove 221, thereby achieving a hard seal for the valve core 20.

[0055] Specifically, the area of ​​the projection 232 that contacts and is supported by the third sealing member 233 accounts for 15% to 50% of the area of ​​the side surface of the third sealing member 233 facing the valve opening 171. This not only strengthens the contact support but also allows the third sealing member 233 to contact the valve seat 17.

[0056] In some embodiments, the area of ​​the projection 232 that contacts and is supported by the third sealing member 233 accounts for 30% to 40% of the surface area of ​​one side of the third sealing member 233 facing the valve opening 171.

[0057] Specifically, the outer diameter of the projection 232 is provided to correspond to the inner diameter of the valve opening 171, and when the stop valve 100 is in the closed state, the projection 232 can enter the valve opening 171, thereby guiding the axial movement of the valve core 20, and the projection 232 is restricted in the circumferential direction by the valve opening 171, increasing the stability of the closed state of the stop valve 100.

[0058] Furthermore, the side wall of the projection 232 and the bottom wall of the projection 232 facing the valve opening 171 are connected by a fillet. This design avoids stress concentration and increases strength, and the guiding effect of the fillet structure is better when the guide portion 23 is inserted into the valve opening 171.

[0059] In some embodiments, the projection 232 is positioned such that, after entering the valve opening 171, its outer circumference contacts the inner wall of the valve opening 171 in the circumferential direction, thereby enhancing the restricting effect on the projection 232.

[0060] In some embodiments, when the third sealing member 233 abuts against the end face of the valve opening 171 toward the connection portion 22, the depth to which the projection 232 is inserted into the valve opening 171 is at least 1 mm, for example, 2 mm, 3 mm, 4 mm, etc. With this design, the depth to which the guide portion 23 is inserted into the valve opening 171 is within an appropriate range, and the performance of blocking the medium due to an insertion depth that is too shallow is avoided.

[0061] An annular projection 111 corresponding to the third sealing member 233 is provided on the end face of the valve seat 17 facing the valve core 20, and when the stop valve 100 is closed, the third sealing member 233 engages with the annular projection 111 to seal the valve opening 171.

[0062] In some embodiments, the shape of one side of the annular projection 111 facing the third sealing member 233 is a smooth arc, thereby avoiding damage to the third sealing member 233 and ensuring the sealing performance between the annular projection 111 and the third sealing member 233.

[0063] Selectively, in other embodiments, the shape of one side of the annular projection 111 facing the third sealing member 233 may be a rectangle, a triangle, or any other shape that can similarly ensure sealing performance.

[0064] When the stop valve 100 is closed, the valve core 20 moves toward the valve opening 171, and eventually the third sealing member 233 comes into contact with the annular projection 111 so that the first opening 11 and the first connecting pipe 13 are blocked from the inside of the valve body 10. In some embodiments, the third sealing member 233 is made of pure copper to ensure a sealing performance between the third sealing member 233 and the valve opening 171. In other embodiments, the third sealing member 233 may be made of a material that can similarly ensure a sealing performance, such as hard plastic.

[0065] Furthermore, the stop valve 100 further includes a valve assembly 30, which is connected to the main body 16. In this embodiment, the valve assembly 30 and the second opening 12 are positioned opposite each other and are used as an air inlet for replenishing the medium throughout the cooling system or as an exhaust outlet for releasing the medium. In other embodiments, the axis of the valve assembly 30 may be perpendicular to the axis of the second opening 12, and the valve assembly 30 may be located at other positions on the main body 16.

[0066] The valve assembly 30 includes a connector 33, which is connected to the main body 16, and the connector 33 serves as a passage through which the medium enters the valve body 10.

[0067] The valve assembly 30 further includes a valve core 35, a housing 31, and a fourth sealing member 32. The valve core 35 is provided within the connector 33 so that the inside of the body 16 and the inside of the connector 33 can communicate or block each other. The housing 31 is fitted to the outer circumference of the connector 33 and is used to protect the valve core 35 and prevent external impurities from entering. The fourth sealing member 32 is located between the housing 31 and the connector 33 and engages with the housing 31 to seal the connector 33.

[0068] Specifically, an elastic member 34 is provided at one end of the valve core 35. When the valve core 35 is not subjected to external pressure, it maintains a closed state, and at this time, the connecting body 33 maintains a seal, isolating the inside of the valve body 10 from the outside. When the valve core 35 is subjected to pressure, it presses against the elastic member 34 and moves toward the body 16, thereby releasing the seal and creating communication between the inside of the body 16 and the inside of the connecting body 33, allowing the medium to enter the inside of the valve body 10 or flow out from the inside of the valve body 10. The elastic member 34 is used to return the valve core 35 to its original position.

[0069] This application further provides a cooling system including the above-described shut-off valve 100, which is installed in a medium passage of the cooling system and used to control the blocking and flow of the passage and to replenish the medium in the cooling system.

[0070] Referring to Figures 1 and 5 to 8, in the operation process of the stop valve 100 of this embodiment, when it is necessary to close the stop valve 100, the operating part 21 at the top of the stop valve 100 is twisted, causing the operating part 21 and the connecting part 22 to rotate synchronously, and the engagement of the first screw segment 211 and the second screw segment 151 causes the connecting part 22 to move axially relative to the end cover 15 in conjunction with the valve core 20, thereby inserting the guide part 23 at the bottom end of the valve core 20 into the valve opening 171, the third sealing member 233 to come into contact with the valve seat 17, sealing the first connecting pipe 13, and thereby achieving isolation between the first connecting pipe 13 and the second connecting pipe 14.

[0071] Compared with related technologies, the guide portion 23 of the valve core 20 in this application is supported in contact with the third sealing member 233, achieving a hard seal of the valve core 20 and preventing the third sealing member 233 from falling off.

[0072] The technical features of the above embodiments can be combined in any way, and for the sake of brevity, not all possible combinations of the technical features in the embodiments described above are described. However, as long as these combinations of technical features are inconsistent, they should all be considered to fall within the scope described herein.

[0073] The above embodiments merely illustrate some of the embodiments of this application, and although their descriptions are relatively specific and detailed, they should not be understood as limiting the scope of the utility model claims. It should be noted that those skilled in the art can make several modifications and improvements without departing from the spirit of this application, and all of these fall within the scope of protection of this application. Therefore, the scope of protection of the patent in this application should be in accordance with the attached claims.

Claims

1. A hollow valve body having a valve seat inside, the valve seat having a valve opening, A valve core, at least a portion of which is provided inside the valve body and which is movable along the axial direction of the valve body to seal or open the valve opening, The valve core includes a connecting portion and a guide portion connected to each other, the guide portion is provided at one end of the connecting portion adjacent to the valve opening and can enter into the valve opening, a third sealing member is provided at the end of the connecting portion adjacent to the guide portion, the third sealing member can abut against the valve seat, and at least a portion of the guide portion is supported in contact with the third sealing member. The inner diameter of the valve opening is provided to correspond to the outer diameter of the guide portion, and the outer wall of the guide portion abuts against the inner wall of the valve opening. A first groove is provided on one side of the connecting portion facing the guide portion, and the third sealing member is provided within the first groove. The base end edge of the guide portion, which is on the connection side, is positioned on the surface of the third sealing member provided in the first groove. The area of ​​the guide portion that contacts and is supported by the third sealing member accounts for 30% to 40% of the area of ​​the surface of the third sealing member facing the valve opening. A stop valve in which, when the third sealing member is in contact with the end face of the valve seat toward the connection portion, the depth to which the guide portion enters the valve opening is at least 1 mm.

2. The stop valve according to claim 1, wherein the guide portion and the connecting portion are provided separately.

3. A second groove is provided on one side of the connecting portion facing the guide portion, the guide portion includes a first segment and a projection, the first segment is provided at one end of the projection facing the connecting portion and is fitted into the second groove and connected to the inner wall of the second groove, and the projection is connected to one side of the first segment away from the connecting portion and can enter the valve opening, as described in claim 2.

4. A second groove is provided on one side of the guide portion facing the connection portion, and one end of the connection portion is fitted into the second groove and connected to the inner wall of the second groove, as described in claim 2.

5. A second groove is provided on one side of the connecting portion facing the guide portion, and the guide portion is pin-connected or screwed into the inner wall of the second groove, as described in claim 3.

6. A second groove is formed on one side of the guide portion facing the connection portion, and the connection portion is pin-connected or screwed into the inner wall of the second groove, as described in claim 4.

7. The stop valve according to claim 1, wherein the material of the third sealing member is pure copper or plastic.

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