shutoff valve

Abstract

The application relates to the technical field of valves, and provides a shut-off valve. The shut-off valve comprises a valve body, a valve seat, a valve core assembly and a communication pipe, the valve body is provided with a first channel penetrating through the valve body, and the valve seat is provided with a second channel penetrating through the valve seat; the valve core assembly is movably arranged in the first channel, the communication pipe is configured to have a disconnected state and a connected state, when the communication pipe is in the disconnected state, the first channel is conducted to transmit medium, and when the communication pipe is in the connected state, the communication pipe connects a medium inlet and a medium outlet to eliminate the pressure difference between the medium inlet and the medium outlet when the first channel is cut off. The shut-off valve provided by the application can rapidly balance the pressure at the medium inlet and the medium outlet by switching the communication pipe to the connected state, so that the resistance of the valve core assembly moving away from the valve seat can be reduced, and the function realization of the shut-off valve can be guaranteed, the sealing performance of the shut-off valve can be guaranteed, and the service life can be prolonged.

Description

Technical Field

[0001] This application relates to the field of valve technology, and more particularly to a shut-off valve. Background Technology

[0002] The hydrogen delivery pressure control system mainly consists of a safety shut-off valve and a working pressure regulating valve. The valve body of the shut-off valve is connected to the pipeline before the working pressure regulating valve through a flange. The safety shut-off valve is an important safety protection device in the entire delivery system, and the valve seat sealing performance is particularly important.

[0003] Currently, most hydrogen delivery shut-off valves on the market employ an unbalanced valve stem design. This design results in excessive resistance to valve stem movement under high pressure conditions, necessitating the use of a high-stiffness spring to ensure valve sensitivity under such conditions. When the internal pressure of the valve decreases, the valve stem movement resistance decreases accordingly. However, the release of the high-stiffness spring's stored energy can cause impact damage to the valve stem, affecting sealing performance and potentially even damaging the shut-off valve. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides a shut-off valve.

[0005] This application provides a shut-off valve, comprising:

[0006] The valve body has a through first channel, with the two ends of the first channel forming a medium inlet and a medium outlet, respectively.

[0007] A valve seat is disposed in the first channel, and the outer wall of the valve seat is sealed to the inner wall of the first channel. The valve seat is located between the medium inlet and the medium outlet, and a through second channel is provided on the valve seat.

[0008] A valve core assembly is movably disposed within the first channel and configured to move toward the valve seat to block the second channel and shut off the first channel, and to move away from the valve seat to expose the second channel and open the first channel;

[0009] A connecting pipe, one end of which is connected to the medium inlet and the other end of which is connected to the medium outlet, is configured to have a disconnected state and a connected state. When the connecting pipe is in the disconnected state, the first channel is open for medium transfer. When the connecting pipe is in the connected state, the connecting pipe connects the medium inlet and the medium outlet to eliminate the pressure difference between the medium inlet and the medium outlet when the first channel is cut off.

[0010] Optionally, the valve body is provided with a first valve cover and a second valve cover;

[0011] The valve core assembly includes a valve core, a guide rod, and a sealing gasket. The guide rod is fixedly connected to the valve core, and the valve core is movably engaged with the first valve cover. The guide rod passes through the second channel and is movably engaged with the second valve cover.

[0012] The sealing gasket is disposed on the side of the valve core facing the valve seat, so that when the valve core blocks the second channel, the sealing gasket seals against the valve seat.

[0013] Optionally, the valve core has a threaded hole, the middle area of ​​the sealing gasket has a through hole, and the end of the guide rod near the valve core is formed as a threaded end, which passes through the through hole and is threadedly engaged with the threaded hole.

[0014] A groove is provided at the opening of the threaded hole, a limiting edge is provided on the guide rod, and the sealing gasket is limited between the bottom wall of the groove and the limiting edge in the first direction, and between the side wall of the groove and the guide rod in the second direction.

[0015] Wherein, the first direction is the axial direction of the guide rod, and the second direction intersects with the first direction.

[0016] Optionally, the valve seat is provided with a tapered tip on the side facing the valve core, the tapered tip extends around the opening of the second channel, and the sealing gasket is squeezed and sealed with the tapered tip;

[0017] The outer surface of the conical tip is formed as an outer conical surface, and the inner surface at the groove opening is formed as an inner conical surface. The outer conical surface and the inner conical surface are fitted together to achieve a hard seal.

[0018] Optionally, the first valve cover is provided with a first clearance channel, the valve core includes a core body and a spindle disposed on the core body, the guide rod is fixedly connected to the core body, and the spindle slides through the first clearance channel;

[0019] The second valve cover is provided with a second clearance channel, and the guide rod slides through the second clearance channel.

[0020] Optionally, a first sealing ring is provided between the outer wall surface of the mandrel and the inner wall surface of the first clearance channel;

[0021] And / or, a second sealing ring is provided between the outer wall surface of the guide rod and the inner wall surface of the second clearance channel;

[0022] And / or, a third sealing ring is provided between the first valve cover and the valve body;

[0023] And / or, a fourth sealing ring is provided between the second valve cover and the valve body.

[0024] Optionally, a fifth sealing ring is provided between the outer wall of the valve seat and the inner wall of the first channel.

[0025] Optionally, the valve body is further provided with a first balancing channel, the first balancing channel being connected to the inner wall of the first channel at the medium inlet, and one end of the connecting pipe being connected to the medium inlet through the first balancing channel;

[0026] And / or, the valve body is further provided with a second balancing channel, the second balancing channel being connected to the inner wall of the first channel at the medium outlet, and the other end of the connecting pipe being connected to the medium outlet through the second balancing channel.

[0027] Optionally, the first channel includes a first sub-channel, a second sub-channel, and a third sub-channel connected in sequence;

[0028] The first sub-channel is set at an angle to the second sub-channel, the third sub-channel is set at an angle to the second sub-channel, and the first sub-channel and the third sub-channel extend in opposite directions;

[0029] The valve seat is located within the second sub-channel.

[0030] Optionally, the shut-off valve further includes a drive unit connected to the valve core assembly to drive the valve core assembly toward or away from the valve seat.

[0031] The technical solution provided in this application has the following advantages compared with the prior art:

[0032] The shut-off valve provided in this application includes a valve body, a valve seat, a valve core assembly, and a connecting pipe. When media transportation is required, the valve core assembly exposes a second channel, meaning both the second and first channels are open. At this time, the connecting pipe is also disconnected, and only the first channel connects the media inlet and outlet for the transportation of media such as hydrogen. There is no bypass path for hydrogen transportation. When media transportation needs to be cut off, the valve core assembly is pushed towards the valve seat until it is pressed against the valve seat to block the second channel. At this time, the first channel is cut off by the cooperation of the valve core assembly and the valve seat, i.e., media transportation is cut off. When it is necessary to reconnect, the valve core assembly needs to be moved away from the valve seat. When the valve core assembly moves away from the valve seat, the pressure on the side facing the medium inlet is higher because the valve core assembly is pressed against the valve seat. By switching the connecting pipe to the connected state, the pressure at the medium inlet and outlet is quickly balanced, thus eliminating the pressure difference between them. This reduces the resistance of the valve core assembly moving away from the valve seat. In other words, by setting up the connecting pipe, a pressure balancing effect is achieved, significantly reducing the operating resistance of the valve core assembly under high pressure conditions. This avoids the use of high-stiffness springs, thereby preventing the impact damage to the shut-off valve caused by the release of spring energy at low pressure. Consequently, the shut-off valve function is guaranteed, as well as its sealing performance and service life are extended. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the shut-off valve according to an embodiment of the present application when the first channel is open;

[0036] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0037] Figure 3 This is a schematic diagram of the shut-off valve according to an embodiment of the present application when the first channel is shut off;

[0038] Figure 4 for Figure 3 A magnified view of part B in the middle.

[0039] In the diagram: 1. Valve body; 11. First channel; 111. First sub-channel; 112. Second sub-channel; 113. Third sub-channel; 12. Medium inlet; 13. Medium outlet; 14. First valve cover; 141. First sealing ring; 142. Third sealing ring; 15. Second valve cover; 151. Second sealing ring; 152. Fourth sealing ring;

[0040] 2. Valve seat; 21. Second passage; 22. Conical tip; 23. Fifth sealing ring;

[0041] 3. Valve core assembly; 31. Valve core; 311. Threaded hole; 312. Countersunk groove; 313. Core body; 314. Mandrel; 315. Sixth sealing ring; 32. Guide rod; 321. Threaded end; 322. Limiting edge; 33. Sealing gasket;

[0042] 4. Connecting pipe. Detailed Implementation

[0043] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0044] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0045] The shut-off valve will be described in detail below through specific embodiments:

[0046] Reference Figures 1 to 4 As shown, some embodiments of this application provide a shut-off valve, including a valve body 1, a valve seat 2, a valve core assembly 3, and a connecting pipe 4.

[0047] The valve body 1 has a through-passage first channel 11, with a medium inlet 12 and a medium outlet 13 at its two ends. A valve seat 2 is disposed within the first channel 11, with its outer wall sealingly fitted to the inner wall of the first channel 11. The valve seat 2 is located between the medium inlet 12 and the medium outlet 13, and a through-passage second channel 21 is provided on the valve seat 2. In other words, during medium transport, at the position corresponding to the valve seat 2, the medium can only be transported from the medium inlet 12 to the medium outlet 13 through the second channel 21.

[0048] The valve core assembly 3 is movably disposed within the first channel 11 and is configured to move toward the valve seat 2 to block the second channel 21 and cut off the first channel 11, thereby cutting off the medium from the medium inlet 12 to the medium outlet 13. The valve core assembly 3 can also move away from the valve seat 2 to expose the second channel 21 and open the first channel 11, thereby allowing the medium to be transported from the medium inlet 12 to the medium outlet 13.

[0049] One end of the connecting pipe 4 is connected to the medium inlet 12, and the other end is connected to the medium outlet 13. The connecting pipe 4 is configured to have a disconnected state and a connected state. When the connecting pipe 4 is in the disconnected state, the first channel 11 is opened to carry out medium transmission. When the connecting pipe 4 is in the connected state, the connecting pipe 4 connects the medium inlet 12 and the medium outlet 13 to eliminate the pressure difference between the medium inlet 12 and the medium outlet 13 when the first channel 11 is cut off.

[0050] In practice, when media transportation is required, the valve core assembly 3 exposes the second channel 21, that is, both the second channel 21 and the first channel 11 are connected. At this time, the connecting pipe 4 is also disconnected. There is only the first channel 11 connecting the media inlet 12 and the media outlet 13 for the transportation of media such as hydrogen. There is no bypass path for hydrogen transportation.

[0051] When it is necessary to cut off the medium delivery, the valve core assembly 3 is pushed toward the valve seat 2 until the valve core assembly 3 is pressed against the valve seat 2 to block the second channel 21. At this time, the first channel 11 is cut off by the cooperation of the valve core assembly 3 and the valve seat 2, that is, the medium delivery is cut off.

[0052] When it is necessary to reconnect, the valve core assembly 3 needs to move away from the valve seat 2. At this time, since the valve core assembly 3 is pressed against the valve seat 2, the air pressure on the side of the valve core assembly 3 facing the medium inlet 12 is relatively large. By switching the connecting pipe 4 to the connected state, the pressure at the medium inlet 12 and the medium outlet 13 is quickly balanced, which can eliminate the pressure difference between the two. In this way, the resistance of the valve core assembly 3 moving away from the valve seat 2 can be reduced.

[0053] In other words, by setting up the connecting pipe 4, the pressure is balanced, which significantly reduces the operating resistance of the valve core assembly 3 under high pressure conditions, avoids the use of high-stiffness springs, and thus prevents the impact damage to the shut-off valve caused by the release of spring energy under low pressure. This ensures the functionality of the shut-off valve, as well as its sealing performance and extends its service life.

[0054] In other words, by setting up the connecting pipe 4, pressure balance can be achieved on the side of valve seat 2 facing the medium inlet 12 and the side of valve seat 2 facing the medium outlet 13, thereby reducing the operating resistance of valve core assembly 3 when the first channel 11 needs to be opened.

[0055] In practice, a separate controllable shut-off valve is provided on the connecting pipe 4 to switch between the disconnected and connected states of the connecting pipe 4. It can be used in conjunction with the valve core assembly 3 as needed to cut off or open the first channel 11.

[0056] In some embodiments, refer to Figure 1 and Figure 3 As shown, a first valve cover 14 and a second valve cover 15 are provided on the valve body 1, wherein the first valve cover 14 and the second valve cover 15 are arranged at opposite ends on the valve body 1 along the movement direction of the valve core assembly 3. The first valve cover 14 and the second valve cover 15 can be fixed to the valve body 1 by bolt connection or thread.

[0057] Reference Figure 2 As shown, the valve core assembly 3 includes a valve core 31, a guide rod 32, and a sealing gasket 33. The guide rod 32 is fixedly connected to the valve core 31, and the valve core 31 is movably engaged with the first valve cover 14. The guide rod 32 passes through the second channel 21 and is movably engaged with the second valve cover 15 to guide the direction of movement of the valve core 31 through the first valve cover 14 and the second valve cover 15, preventing the valve core 31 from deflecting, improving the movement accuracy and movement stability, and ensuring that the valve core assembly 3 is pressed against the valve seat 2 to achieve reliable sealing.

[0058] It should be noted that after the valve core 31 is fixedly connected to the guide rod 32, the positions of the two ends are supported and guided by the first valve seat 2 and the second valve seat 2 respectively, resulting in high stability.

[0059] The sealing gasket 33 is disposed on the side of the valve core 31 facing the valve seat 2, so that when the valve core 31 blocks the second channel 21, the sealing gasket 33 seals against the valve seat 2. The sealing gasket 33 undergoes elastic deformation when the valve core 31 presses against the valve seat 2, filling the microscopic unevenness, thereby forming a soft seal between the sealing end and the valve seat 2.

[0060] In some embodiments, continue to refer to Figure 2 As shown, the valve core 31 has a threaded hole 311, the middle area of ​​the sealing gasket 33 has a through hole, and the end of the guide rod 32 near the valve core 31 is formed as a threaded end 321. The threaded end 321 passes through the through hole and is threadedly engaged with the threaded hole 311 to achieve a fixed connection between the valve core 31 and the guide rod 32.

[0061] A recessed groove 312 is provided at the opening of the threaded hole 311, and a limiting edge 322 is provided on the guide rod 32. The sealing gasket 33 is limited between the bottom wall of the recessed groove 312 and the limiting edge 322 along a first direction, and between the side wall of the recessed groove 312 and the guide rod 32 along a second direction; wherein, the first direction is the axial direction of the guide rod 32, and the second direction intersects with the first direction. That is to say, the bottom wall and side wall of the recessed groove 312, the limiting edge 322, and the surface of the guide rod 32 can jointly enclose an annular space with a square cross-section, thereby realizing the limiting and fixing of the sealing gasket 33.

[0062] The sealing gasket 33 is formed into a ring structure. During the tightening of the guide rod 32, the sealing gasket 33 undergoes elastic deformation and gradually seals against the bottom and side walls of the guide rod 32, the limiting edge 322, and the settling groove 312. When the sealing end covers the opening of the second channel 21, the second channel 21 can be blocked to cut off the first channel 11 under the action of the guide rod 32, the valve core 31, and the sealing gasket 33, thereby disconnecting the transport of the medium.

[0063] Furthermore, referring to Figure 2 As shown, a sixth sealing ring 315 is also provided between the sealing gasket 33 and the bottom of the sink 312, which can further increase the sealing performance and prevent air leakage.

[0064] In some embodiments, refer to Figure 4 As shown, a tapered tip 22 is provided on the side of the valve seat 2 facing the valve core 31. The tapered tip 22 extends around the opening of the second channel 21. The sealing gasket 33 is squeezed and sealed with the tapered tip 22. When the tapered tip 22 is squeezed into the sealing gasket 33, the contact area can be increased and the sealing effect can be improved.

[0065] The outer surface of the conical tip 22 is formed as an outer conical surface, and the inner surface at the opening of the groove 312 is formed as an inner conical surface. The outer conical surface and the inner conical surface are fitted together to achieve a hard seal. In specific implementation, when the valve core 31 moves toward the valve seat 2, the sealing gasket 33 first contacts the conical tip 22 to form a soft seal; as the pressure increases, the inner conical surface and the outer conical surface gradually fit together, thus forming a metal hard seal.

[0066] In this application, a hard seal is achieved through the fit between the outer and inner conical surfaces, and a soft seal is achieved through the compression between the sealing gasket 33 and the conical tip 22. With the dual protection of hard and soft seals, the sealing reliability under high pressure is further improved, and the problem of easy damage to a single soft seal is avoided.

[0067] Specifically, the outer conical surface and the inner conical surface form a metal-to-metal mating contact surface, which has a good sealing effect.

[0068] In some embodiments, the first valve cover 14 is provided with a first clearance channel, the valve core 31 includes a core body 313 and a spindle 314 disposed on the core body 313, the guide rod 32 is fixedly connected to the core body 313, and the spindle 314 slides through the first clearance channel, that is, the first clearance channel provides sliding space for the spindle 314. The second valve cover 15 is provided with a second clearance channel, and the guide rod 32 slides through the second clearance channel, that is, the second clearance channel provides sliding space for the guide rod 32.

[0069] Understandably, the spindle 314 slides in the first clearance channel and the guide rod 32 slides in the second clearance channel, forming a double guide structure, which greatly improves motion stability, avoids valve core 31 jamming or deflection, and ensures the sensitivity and repeatability of valve core assembly 3.

[0070] Furthermore, guide sleeves can be installed in the first and second clearance channels to reduce friction and wear. The first and second clearance channels are coaxially arranged, that is, the spindle 314 and the guide rod 32 are also coaxially arranged.

[0071] In some embodiments, refer to Figure 1 and Figure 3 As shown, a first sealing ring 141 is provided between the outer wall surface of the spindle 314 and the inner wall surface of the first clearance channel to prevent the medium from leaking from the gap between the spindle 314 and the first clearance channel to the outside of the valve body 1.

[0072] A second sealing ring 151 is provided between the outer wall surface of the guide rod 32 and the inner wall surface of the second clearance channel to prevent the medium from leaking from the gap between the guide rod 32 and the second clearance channel to the outside of the valve body 1.

[0073] A third sealing ring 142 is provided between the first valve cover 14 and the valve body 1 to prevent the medium from leaking from the gap between the first valve cover 14 and the valve body 1 to the outside of the valve body 1.

[0074] A fourth sealing ring 152 is provided between the second valve cover 15 and the valve body 1 to prevent the medium from leaking from the gap between the second valve cover 15 and the valve body 1 to the outside of the valve body 1.

[0075] By setting multiple sealing rings, a multi-layered sealing barrier is constructed to ensure the zero-leakage requirement of the shut-off valve in a high-pressure hydrogen environment.

[0076] Reference Figure 4 As shown, a fifth sealing ring 23 is provided between the outer wall of the valve seat 2 and the inner wall of the first channel 11, so as to achieve a sealing fit between the outer wall of the valve seat 2 and the inner wall of the first channel 11 through the fifth sealing ring 23. Thus, when the valve core assembly 3 blocks the second channel 21, the first channel 11 is completely cut off by the valve core assembly 3 and the valve seat 2, thereby cutting off the delivery of the medium.

[0077] In specific implementation, a first balancing channel is also provided inside the valve body 1. The first balancing channel is connected to the inner wall of the first channel 11 at the medium inlet 12, and one end of the connecting pipe 4 is connected to the medium inlet 12 through the first balancing channel; and / or, a second balancing channel is also provided inside the valve body 1. The second balancing channel is connected to the inner wall of the first channel 11 at the medium outlet 13, and the other end of the connecting pipe 4 is connected to the medium outlet 13 through the second balancing channel. That is to say, the connecting pipe 4 avoids the position of the first channel 11 and connects to the medium inlet 12 through the first balancing channel, and avoids the position of the first channel 11 and connects to the medium outlet 13 through the second balancing channel. The first channel 11, the first balancing channel and the second balancing channel are integrated inside the valve body 1. This integrated arrangement simplifies the external pipeline layout and reduces the risk of leakage and installation complexity.

[0078] In some embodiments, the first channel 11 includes a first sub-channel 111, a second sub-channel 112, and a third sub-channel 113 connected in sequence; the first sub-channel 111 and the second sub-channel 112 are arranged at an angle, and the third sub-channel 113 and the second sub-channel 112 are arranged at an angle, and the first sub-channel 111 and the third sub-channel 113 extend in opposite directions; the valve seat 2 is located in the second sub-channel 112. That is, the first channel 11 is a Z-shaped channel or an S-shaped channel, which reduces the direct impact of fluid on the valve core 31 and improves the overall stability of the shut-off valve.

[0079] For example, refer to Figure 1 and Figure 3 As shown, the first sub-channel 111, the second sub-channel 112 and the third sub-channel 113 are arranged sequentially from left to right. The medium inlet 12 and the medium outlet 13 are respectively located on both sides of the valve body 1 in the left and right directions. The second sub-channel 112 extends in the up and down direction. The first valve cover 14 and the second valve cover 15 are respectively located on both sides of the valve body 1 in the up and down direction.

[0080] When the spindle 314 and guide rod 32 in the valve core assembly 3 move relative to the first valve cover 14 and the second valve cover 15 respectively, they will not occupy too much of the internal space of the first channel 11, thus ensuring the efficiency of medium transportation.

[0081] In some embodiments, the shut-off valve further includes a drive member connected to the valve core assembly 3, so as to drive the valve core assembly 3 to move toward or away from the valve seat 2, thereby completing the shut-off and opening of the first channel 11 under the drive of external force, saving time and effort, realizing the automatic and rapid shut-off of the shut-off valve, and responding to the system safety requirements.

[0082] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0083] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to these embodiments, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shut-off valve, characterized in that, include: The valve body (1) has a through first channel (11) inside, and the two ends of the first channel (11) are respectively formed as a medium inlet (12) and a medium outlet (13); A valve seat (2) is disposed in the first channel (11), and the outer wall of the valve seat (2) is sealed to the inner wall of the first channel (11). The valve seat (2) is located between the medium inlet (12) and the medium outlet (13), and a through second channel (21) is provided on the valve seat (2). The valve core assembly (3) is movably disposed within the first channel (11) and is configured to move toward the valve seat (2) to block the second channel (21) and cut off the first channel (11), and to move away from the valve seat (2) to expose the second channel (21) and open the first channel (11); A connecting pipe (4) is connected at one end to the medium inlet (12) and at the other end to the medium outlet (13). The connecting pipe (4) is configured to have a disconnected state and a connected state. When the connecting pipe (4) is in the disconnected state, the first channel (11) is open to transmit the medium. When the connecting pipe (4) is in the connected state, the connecting pipe (4) connects the medium inlet (12) and the medium outlet (13) to eliminate the pressure difference between the medium inlet (12) and the medium outlet (13) when the first channel (11) is cut off.

2. The shut-off valve according to claim 1, characterized in that, The valve body (1) is provided with a first valve cover (14) and a second valve cover (15); The valve core assembly (3) includes a valve core (31), a guide rod (32) and a sealing gasket (33). The guide rod (32) is fixedly connected to the valve core (31), and the valve core (31) is movably engaged with the first valve cover (14). The guide rod (32) passes through the second channel (21) and is movably engaged with the second valve cover (15). The sealing gasket (33) is disposed on the side of the valve core (31) facing the valve seat (2) so that when the valve core (31) blocks the second channel (21), the sealing gasket (33) seals against the valve seat (2).

3. The shut-off valve according to claim 2, characterized in that, The valve core (31) has a threaded hole (311), the sealing gasket (33) has a through hole in the middle area, and the guide rod (32) has a threaded end (321) at one end near the valve core (31). The threaded end (321) passes through the through hole and is threadedly engaged with the threaded hole (311). A groove (312) is provided at the opening of the threaded hole (311), a limiting edge (322) is provided on the guide rod (32), and the sealing gasket (33) is limited in the first direction between the bottom wall of the groove (312) and the limiting edge (322), and in the second direction between the side wall of the groove (312) and the guide rod (32). The first direction is the axial direction of the guide rod (32), and the second direction intersects with the first direction.

4. The shut-off valve according to claim 3, characterized in that, The valve seat (2) is provided with a tapered tip (22) on the side facing the valve core (31). The tapered tip (22) extends around the opening of the second channel (21). The sealing gasket (33) is squeezed and sealed with the tapered tip (22). The outer surface of the conical tip (22) is formed as an outer conical surface, and the inner surface at the groove opening of the sink (312) is formed as an inner conical surface. The outer conical surface and the inner conical surface are fitted together to achieve a hard seal.

5. The shut-off valve according to claim 2, characterized in that, The first valve cover (14) is provided with a first clearance channel. The valve core (31) includes a core body (313) and a spindle (314) provided on the core body (313). The guide rod (32) is fixedly connected to the core body (313). The spindle (314) slides through the first clearance channel. The second valve cover (15) is provided with a second clearance channel, and the guide rod (32) slides through the second clearance channel.

6. The shut-off valve according to claim 5, characterized in that, A first sealing ring (141) is provided between the outer wall surface of the mandrel (314) and the inner wall surface of the first clearance channel; And / or, a second sealing ring (151) is provided between the outer wall surface of the guide rod (32) and the inner wall surface of the second clearance channel; And / or, a third sealing ring (142) is provided between the first valve cover (14) and the valve body (1); And / or, a fourth sealing ring (152) is provided between the second valve cover (15) and the valve body (1).

7. The shut-off valve according to any one of claims 1 to 6, characterized in that, A fifth sealing ring (23) is provided between the outer wall of the valve seat (2) and the inner wall of the first channel (11).

8. The shut-off valve according to any one of claims 1 to 6, characterized in that, The valve body (1) is also provided with a first balance channel, which is connected to the inner wall of the first channel (11) at the medium inlet (12). One end of the connecting pipe (4) is connected to the medium inlet (12) through the first balance channel. And / or, the valve body (1) is further provided with a second balance channel, the second balance channel is connected to the inner wall of the first channel (11) at the medium outlet (13), and the other end of the connecting pipe (4) is connected to the medium outlet (13) through the second balance channel.

9. The shut-off valve according to any one of claims 1 to 6, characterized in that, The first channel (11) includes a first sub-channel (111), a second sub-channel (112), and a third sub-channel (113) connected in sequence; The first sub-channel (111) and the second sub-channel (112) are set at an angle, and the third sub-channel (113) is set at an angle to the second sub-channel (112), and the first sub-channel (111) and the third sub-channel (113) extend in opposite directions; The valve seat (2) is located within the second sub-channel (112).

10. The shut-off valve according to any one of claims 1 to 6, characterized in that, The shut-off valve also includes a drive unit connected to the valve core assembly (3) to drive the valve core assembly (3) to move toward or away from the valve seat (2).

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