A stop valve

Abstract

The application discloses a stop valve, and belongs to the valve field, which is used to solve the problem of how to reduce the resistance of the valve core and improve the corresponding speed of the stop valve. The stop valve comprises a valve sleeve provided with a spring cavity and a valve cavity; an end cover arranged on the valve sleeve; an adjusting screw threadedly connected to the end cover; a spring telescopically arranged in the spring cavity and provided with a positioning piece at each end; a valve core slidably arranged between a first position and a second position of the valve cavity, the valve core being provided with a through hole, the valve sleeve being provided with a pressure relief hole communicated with the valve cavity; the outer surface of the valve core opposite to the inner wall of the valve cavity is provided with a copper layer, and a lubricating groove is arranged on the copper layer; the valve sleeve is provided with a first opening and a second opening both communicated with the valve cavity, and a communication port is arranged between the first opening and the second opening; when the valve core is located at the first position, the first opening and the second opening are communicated through the communication port; when the valve core is located at the second position, the valve core blocks the communication port, so that the first opening and the second opening are isolated.

Description

Technical Field

[0001] This application relates to the field of valves, and particularly to a globe valve. Background Art

[0002] In the field of ocean engineering, hoisting operations are one of the key links. The operating environment is complex and harsh, facing many challenges such as high salt spray, strong wind and waves, and large load fluctuations. To ensure the safety and stability of the hoisting process, an emergency system for ocean engineering hoisting has emerged. This system can respond quickly in case of emergencies and, through a series of hydraulic control and power regulation devices, achieve precise control of the actions of hoisting equipment, preventing serious accidents such as equipment damage and cargo falling caused by unexpected situations, and ensuring the safety of personnel's lives and the integrity of ocean engineering facilities.

[0003] As a core component in the hydraulic control circuit of the emergency system for ocean engineering hoisting, the globe valve is mainly used to stabilize the pressure in the hydraulic system, reduce the pressure of high-pressure oil to the working pressure required by the system, and maintain the stable output of this pressure, thereby ensuring the smoothness and accuracy of hoisting operations.

[0004] However, there is an urgent problem in the actual use of the globe valve currently applied to the emergency system for ocean engineering hoisting, that is, the resistance to the movement of the valve core is too large, resulting in a slow response speed of the globe valve. The working principle of the globe valve is to change the flow area of the valve port by moving the valve core in the valve body, thereby achieving pressure regulation. The problem of large resistance to the movement of the valve core and slow response speed directly affects the overall performance of the emergency system for ocean engineering hoisting.

[0005] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Utility Model Content

[0006] (I) Technical Problems to be Solved

[0007] The embodiments of this application provide a globe valve, which can solve the problem of how to reduce the resistance to the movement of the valve core and improve the response speed of the globe valve in the prior art.

[0008] (II) Technical Solutions

[0009] To solve the above technical problems, this application provides the following technical solutions:

[0010] A globe valve is provided, and the globe valve includes: a valve sleeve, an end cover, an adjusting screw, a positioning member, a spring, and a valve core;

[0011] The valve sleeve has a length direction, and its interior is provided with interconnected spring chambers and valve chambers arranged sequentially along the length direction;

[0012] The end cap is located at the end of the valve sleeve away from the valve cavity, and the adjusting screw is threaded to the end cap, with one end of it extending into the spring cavity;

[0013] The spring is telescopically disposed within the spring cavity, and a positioning member is provided at each of its two ends. One of the positioning members abuts against the end of the adjusting screw, and the other positioning member abuts against one end of the valve core.

[0014] The valve core is slidably disposed between a first position and a second position of the valve cavity. The valve core is provided with a through hole, one end of which communicates with the valve cavity and the other end of which communicates with the spring cavity. The valve sleeve is provided with a pressure relief hole that communicates with the valve cavity.

[0015] A copper layer is provided on the outer surface of the valve core that is opposite to the inner wall of the valve cavity, and a lubrication groove is provided on the copper layer;

[0016] The valve sleeve is provided with a first opening and a second opening, both of which are in communication with the valve cavity. A connecting port is provided between the first opening and the second opening, and the first opening; when the valve core is in the first position, the first opening and the second opening are connected through the connecting port; when the valve core is in the second position, the valve core blocks the connecting port to isolate the first opening and the second opening.

[0017] In some embodiments, the copper layer is formed by laser cladding of copper alloys, and the inner wall of the valve cavity is made of steel alloy.

[0018] In some embodiments, the through hole includes a transverse hole that penetrates the valve core in the radial direction and a longitudinal hole that communicates with the middle of the transverse hole. Both ends of the transverse hole are connected to the valve cavity, and the longitudinal hole extends along the length direction of the valve core and one end is connected to the spring cavity.

[0019] In some embodiments, a valve core seal is provided between the valve core and the cavity wall of the valve chamber.

[0020] In some embodiments, the valve sleeve includes a main valve sleeve and a floating valve sleeve connected to each other, the main valve sleeve is provided with the spring cavity, and the valve cover is connected to the main valve sleeve; the valve cavity is formed between the main valve sleeve and the floating valve sleeve; the floating valve sleeve is provided with the pressure relief hole, a first opening and a second opening.

[0021] In some embodiments, a sealing nut is provided on the outside of the adjusting screw, and the sealing nut seals the connection between the adjusting screw and the end cap; a waterproof O-ring is provided at the connection between the valve sleeve and the end cap; a waterproof O-ring is provided between the positioning member and the cavity wall of the spring cavity; a retaining ring is provided at the connection between the main valve sleeve and the floating valve sleeve; a retaining ring and a waterproof O-ring are provided on the outside of the floating valve sleeve.

[0022] In some embodiments, the positioning member is provided with a positioning shaft, which is fitted onto the end of the spring.

[0023] In some embodiments, the floating valve sleeve is provided with a positioning sleeve at a position relative to the end of the valve core, and a one-way spring is provided inside the positioning sleeve, with one end of the valve core abutting against the one-way spring.

[0024] (III) Beneficial Effects

[0025] Compared with the prior art, the beneficial effects of the technical solution provided in this application include at least the following:

[0026] In operation, the valve core of this application is initially positioned in the first position. At this time, the adjusting screw applies a certain preload to the spring through the positioning element, compressing the spring. Under the spring's elastic force, the valve core is in the first position, and the first and second openings are connected through a connecting port. The medium can smoothly flow into the valve chamber from the first opening and then out through the connecting port from the second opening, thus the valve is in the open state. Closing process: When the valve needs to be closed, rotating the adjusting screw moves it into the spring chamber, further compressing the spring. The increased spring force pushes the valve core to the second position. As the valve core moves, it gradually approaches and eventually blocks the connecting port. When the valve core completely blocks the connecting port, the first and second openings are isolated, preventing the medium from flowing from the first opening to the second opening, thus closing the valve. Opening process: When the shut-off valve needs to be reopened, rotate the adjusting screw in the opposite direction. The adjusting screw moves out of the spring cavity, reducing the compression of the spring and the elastic force. Under the action of medium pressure or other external forces, the valve core begins to move to the first position. When the valve core moves to the first position, the connection port reopens, the first opening and the second opening are connected again, and the medium can flow normally again, thus reopening the shut-off valve.

[0027] The gate valve of this application has a copper layer plated on the outer surface of the valve core opposite to the inner wall of the valve cavity. Copper has good lubricity and wear resistance, and when in contact with the inner wall of the valve cavity, the coefficient of friction is small, which can effectively reduce the frictional resistance between the valve core and the inner wall of the valve cavity during sliding. Compared with the direct contact between the metal valve core and the inner wall of the valve cavity, the copper layer can reduce the heat and wear generated by friction, making the valve core move more smoothly, thereby improving the response speed of the gate valve. At the same time, several lubrication grooves are formed on the copper layer. When the medium flows in the valve cavity, some of the medium will enter the lubrication grooves and form a liquid film. This liquid film can further reduce the friction between the valve core and the inner wall of the valve cavity, thus playing a lubricating role. At the same time, the lubrication grooves can also store some impurities, preventing impurities from directly adhering to the contact surface between the valve core and the inner wall of the valve cavity, preventing the increase of frictional resistance caused by impurities, ensuring that the valve core can move quickly and accurately, and improving the response speed of the gate valve. Last but not least, the through hole allows the air pressure in the spring chamber and valve chamber to be discharged outward through the pressure relief hole, preventing internal air pressure from affecting the movement of the valve core. This enables the valve core to respond quickly to pressure changes or operating commands, moving promptly between the first and second positions, thus achieving rapid opening or closing of the shut-off valve and improving its response speed. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the valve core of the shut-off valve in the first position in an embodiment of this application;

[0030] Figure 2 yes Figure 1 A schematic diagram of region A in the middle;

[0031] Figure 3 This is a schematic diagram of the valve core of the shut-off valve in the second position in an embodiment of this application;

[0032] Figure 4 This is a front view of the shut-off valve in an embodiment of this application;

[0033] Figure 5 This is a cross-sectional view of the valve core in an embodiment of this application;

[0034] Figure 6 This is a schematic diagram of the connection between the end cap, valve sleeve, and adjusting screw in an embodiment of this application.

[0035] Figure label:

[0036] Valve sleeve 1, spring cavity 11, valve cavity 12, pressure relief hole 13, first opening 14, second opening 15, connecting port 16, main valve sleeve 17, floating valve sleeve 18, snap ring 19, retaining ring 181, first waterproof O-ring 182, positioning sleeve 183, one-way spring 184;

[0037] End cap 2, second waterproof O-ring 21;

[0038] Adjusting screw 3, sealing nut 31, nesting platform 311, threaded sealing gasket 312;

[0039] Positioning component 4, third waterproof O-ring 41, positioning shaft 42;

[0040] Spring 5;

[0041] Valve core 6, through hole 61, copper layer 62, lubrication groove 63, valve core seal 64, horizontal hole 611, vertical hole 612.

[0042] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0043] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present disclosure are shown in the accompanying drawings.

[0044] It should be noted that, where there is no conflict, the embodiments and features described in this disclosure can be combined with each other. The technical solutions of this disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] Unless otherwise stated, the exemplary implementations / embodiments shown are to be understood as providing exemplary features of various details that provide ways in which the technical concepts of this disclosure can be implemented in practice. Therefore, unless otherwise stated, the features of various implementations / embodiments may be additionally combined, separated, interchanged and / or rearranged without departing from the technical concepts of this disclosure.

[0046] The existing gate valve has excessive valve core movement resistance, resulting in a slow response speed. This high valve core movement resistance and slow response speed directly affect the overall performance of marine engineering lifting and hoisting emergency systems.

[0047] To solve the above-mentioned technical problems, this embodiment provides a shut-off valve. (See reference...) Figures 1 to 6 As shown, Figure 1 This is a schematic diagram of the valve core of the shut-off valve in the first position in an embodiment of this application. Figure 2 yes Figure 1 A schematic diagram of region A in the middle. Figure 3 This is a schematic diagram of the valve core of the shut-off valve in the second position in an embodiment of this application. Figure 4 This is a front view of the shut-off valve in an embodiment of this application. Figure 5 This is a cross-sectional view of the valve core in an embodiment of this application. Figure 6 This is a schematic diagram of the connection between the end cap, valve sleeve, and adjusting screw in an embodiment of this application.

[0048] A shut-off valve, comprising: a valve sleeve 1, an end cap 2, an adjusting screw 3, a positioning element 4, a spring 5, and a valve core 6;

[0049] The valve sleeve 1 has a length direction, and its interior is provided with a spring cavity 11 and a valve cavity 12 that are connected to each other along the length direction. The spring cavity 11 is used to accommodate the spring 5 and the positioning member 4, and the valve cavity 12 is used to accommodate the valve core 6.

[0050] The end cap 2 is located at the end of the valve sleeve 1 away from the valve cavity 12. The adjusting screw 3 is threaded to the end cap 2, and one end of it extends into the spring cavity 11.

[0051] The spring 5 is telescopically disposed within the spring cavity 11, and each end of the spring 5 is provided with a positioning member 4, one of the positioning members 4 abutting against the end of the adjusting screw 3, and the other positioning member 4 abutting against one end of the valve core 6.

[0052] The valve core 6 is slidably disposed between the first position and the second position of the valve cavity 12. The valve core 6 is provided with a through hole 61, one end of which is connected to the valve cavity 12 and the other end is connected to the spring cavity 11. The valve sleeve 1 is provided with a pressure relief hole 13 that is connected to the valve cavity 12.

[0053] A copper layer 62 is provided on the outer surface of the valve core 6 opposite to the inner wall of the valve cavity 12, and a lubrication groove 63 is provided on the copper layer 62.

[0054] The valve sleeve 1 is provided with a first opening 14 and a second opening 15, both of which are connected to the valve cavity 12. A connecting port 16 is provided between the first opening 14 and the second opening 15. When the valve core 6 is in the first position, the first opening 14 and the second opening 15 are connected through the connecting port 16. When the valve core 6 is in the second position, the valve core 6 blocks the connecting port 16 to isolate the first opening 14 and the second opening 15.

[0055] In some embodiments, the copper layer 62 is formed by laser cladding of copper alloy, and the inner wall of the valve cavity 12 is made of steel alloy. During manufacturing, laser cladding technology is used to precisely clad copper alloy powder onto the outer surface of the valve core 6. By controlling the laser parameters and cladding process, the copper layer 62 is uniformly and densely adhered to the valve core 6. The copper layer 62 fits into the steel alloy inner wall of the valve cavity 12. Due to the excellent lubricity and wear resistance of copper, the frictional resistance of the valve core 6 sliding within the valve cavity 12 is effectively reduced, decreasing wear between the valve core 6 and the inner wall of the valve cavity 12, thereby extending the service life of the shut-off valve. Simultaneously, the low frictional resistance allows the valve core 6 to move more quickly and smoothly, significantly improving the response speed of the shut-off valve. In marine engineering lifting and emergency systems, this enables more timely response to emergencies, ensuring system safety.

[0056] In some embodiments, the through hole 61 includes a transverse hole 611 extending radially through the valve core 6 and a longitudinal hole 612 communicating with the middle of the transverse hole 611. Both ends of the transverse hole 611 communicate with the valve cavity 12, and the longitudinal hole 612 extends along the length of the valve core 6, with one end communicating with the spring cavity 11. On the one hand, the combined design of the transverse hole 611 and the longitudinal hole 612 makes the internal gas flow path smoother, reduces the resistance of the valve core 6 moving within the valve cavity 12, and improves the response efficiency of the shut-off valve. On the other hand, this structure helps to balance the pressure on both sides of the valve core 6, making the force on the valve core 6 more uniform during movement, further improving the stability of the valve core 6 movement and the response speed of the shut-off valve, ensuring that the shut-off valve can quickly and accurately achieve the opening and closing functions.

[0057] In some embodiments, a valve core seal 64 is provided between the valve core 6 and the cavity wall of the valve chamber 12. The valve core seal 64 can effectively prevent the medium from leaking at the gap between the valve core 6 and the cavity wall of the valve chamber 12, ensuring the sealing performance of the gate valve. At the same time, good sealing performance can also reduce the entry of external impurities into the valve chamber 12, reduce the wear of impurities on the valve core 6 and the inner wall of the valve chamber 12, extend the service life of the gate valve, and ensure that the gate valve can work stably and reliably under various operating conditions.

[0058] In some embodiments, the valve sleeve 1 includes a main valve sleeve 17 and a floating valve sleeve 18 connected to each other. The main valve sleeve 17 is provided with the spring cavity 11, and the end cap 2 is connected to the main valve sleeve 17. The valve cavity 12 is formed between the main valve sleeve 17 and the floating valve sleeve 18. The floating valve sleeve 18 is provided with the pressure relief hole 13, a first opening 14, and a second opening 15. The separate design of the main valve sleeve 17 and the floating valve sleeve 18 facilitates manufacturing and processing, reducing production costs. At the same time, the floating valve sleeve 18 can be finely adjusted according to actual working conditions, improving the adaptability and stability of the shut-off valve.

[0059] In some embodiments, a sealing nut 31 is provided on the outer side of the adjusting screw 3, which seals the connection between the adjusting screw 3 and the end cap 2. A nesting platform 311 is provided on the inner side of the sealing nut 31, and a threaded sealing gasket 312 is provided on the nesting platform 311. The end cap 2 compresses the threaded sealing gasket 312 with an inclined surface, so that the threaded sealing gasket 312 makes sealing contact with the adjusting screw. Compared with the existing conventional installation method, this installation method can achieve automatic sealing of the connection by the threaded sealing gasket 312, and the sealing performance can be improved by compressing the threaded sealing gasket 312. A second waterproof O-ring 21 is provided at the connection between the valve sleeve 1 and the end cap 2; a third waterproof O-ring 41 is provided between the positioning member 4 and the cavity wall of the spring cavity 11; a retaining ring 19 is provided at the connection between the main valve sleeve 17 and the floating valve sleeve 18; a retaining ring 181 and a first waterproof O-ring 182 are provided on the outer side of the floating valve sleeve 18. The above features effectively prevent leakage and intrusion of the medium and external impurities, ensuring the cleanliness and sealing performance of the gate valve's interior and extending its service life. Simultaneously, they improve the adaptability and reliability of the gate valve in harsh environments such as marine engineering projects, ensuring normal operation under various working conditions and reducing malfunctions and maintenance costs caused by leakage and impurity intrusion.

[0060] In some embodiments, the positioning member 4 is provided with a positioning shaft 42, which is fitted into the end of the spring 5. The positioning shaft 42 can ensure that the spring 5 maintains a stable position during compression and extension, and prevent the spring 5 from shifting or shaking.

[0061] In some embodiments, the floating valve sleeve 18 is provided with a positioning sleeve 183 at a position relative to the end of the valve core 6. A one-way spring 184 is disposed within the positioning sleeve 183, and one end of the valve core 6 abuts against the one-way spring 184. The one-way spring 184 provides additional cushioning and positioning for the valve core 6. During the movement of the valve core 6, the one-way spring 184 can absorb some of the impact force, reducing collision and wear between the valve core 6 and the floating valve sleeve 18, and extending the service life of the shut-off valve.

[0062] When the shut-off valve of this application is in operation, in the initial state, the valve core 6 is located in the first position. At this time, the adjusting screw 3 applies a certain preload to the spring 5 through the positioning element 4, so that the spring 5 is in a compressed state. Under the action of the spring force of the spring 5, the valve core 6 is in the first position. The first opening 14 and the second opening 15 are connected through the connecting port 16. The medium can flow smoothly from the first opening 14 into the valve chamber 12, and then flow out from the second opening 15 through the connecting port 16. The shut-off valve is in the open state. Closing process: When it is necessary to close the shut-off valve, by rotating the adjusting screw 3 in the forward direction, the adjusting screw 3 moves into the spring chamber 11, further compressing the spring 5. The spring force of the spring 5 increases, pushing the valve core 6 to move to the second position. As the valve core 6 moves, the valve core 6 gradually approaches and finally blocks the connecting port 16. When the valve core 6 completely blocks the connecting port 16, the first opening 14 and the second opening 15 are isolated, and the medium cannot flow from the first opening 14 to the second opening 15. The shut-off valve is closed. Opening process: When the shut-off valve needs to be reopened, rotate the adjusting screw 3 in the opposite direction. The adjusting screw 3 moves out of the spring cavity 11, and the compression of the spring 5 decreases, and the elastic force also decreases. Under the action of medium pressure or other external forces, the valve core 6 begins to move to the first position. When the valve core 6 moves to the first position, the connecting port 16 reopens, the first opening 14 and the second opening 15 are connected again, the medium can flow normally again, and the shut-off valve reopens.

[0063] The gate valve of this application has a copper layer 62 plated on the outer surface of the valve core 6 opposite to the inner wall of the valve cavity 12. Copper has good lubricity and wear resistance. When in contact with the inner wall of the valve cavity 12, the coefficient of friction is small, which can effectively reduce the frictional resistance between the valve core 6 and the inner wall of the valve cavity 12 during sliding. Compared with the direct contact between the metal valve core 6 and the inner wall of the valve cavity 12, the copper layer 62 can reduce the heat and wear generated by friction, making the movement of the valve core 6 smoother, thereby improving the response speed of the gate valve. At the same time, several lubrication grooves 63 are formed on the copper layer 62. When the medium flows in the valve cavity 12, some of the medium will enter the lubrication grooves 63 and form a liquid film. This liquid film can further reduce the friction between the valve core 6 and the inner wall of the valve cavity 12, playing a lubricating role. At the same time, the lubrication grooves 63 can also store some impurities, preventing impurities from directly adhering to the contact surface between the valve core 6 and the inner wall of the valve cavity 12, preventing the increase of frictional resistance caused by impurities, ensuring that the valve core 6 can move quickly and accurately, and improving the response speed of the gate valve. Last but not least, the through hole 61 allows the air pressure in the spring chamber 11 and valve chamber 12 to be discharged outward through the pressure relief hole 13, preventing the internal air pressure from affecting the movement of the valve core 6. This enables the valve core to respond quickly to pressure changes or operating commands, and to move between the first and second positions in a timely manner, thereby realizing the rapid opening or closing of the shut-off valve and improving the response speed of the shut-off valve.

[0064] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] Those skilled in the art should understand that the above embodiments are merely for illustrating the present disclosure and are not intended to limit the scope of the disclosure. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present disclosure.

Claims

1. A shut-off valve, characterized in that, include: Valve sleeve, end cap, adjusting screw, positioning element, spring, valve core; The valve sleeve has a length direction, and its interior is provided with interconnected spring chambers and valve chambers arranged sequentially along the length direction; The end cap is located at the end of the valve sleeve away from the valve cavity, and the adjusting screw is threaded to the end cap, with one end of it extending into the spring cavity; The spring is telescopically disposed within the spring cavity, and a positioning member is provided at each of its two ends. One of the positioning members abuts against the end of the adjusting screw, and the other positioning member abuts against one end of the valve core. The valve core is slidably disposed between a first position and a second position of the valve cavity. The valve core is provided with a through hole, one end of which communicates with the valve cavity and the other end of which communicates with the spring cavity. The valve sleeve is provided with a pressure relief hole that communicates with the valve cavity. A copper layer is provided on the outer surface of the valve core that is opposite to the inner wall of the valve cavity, and a lubrication groove is provided on the copper layer; The valve sleeve is provided with a first opening and a second opening, both of which are in communication with the valve cavity, and a connecting port is provided between the first opening and the second opening; when the valve core is in the first position, the first opening and the second opening are connected through the connecting port; when the valve core is in the second position, the valve core blocks the connecting port to isolate the first opening and the second opening.

2. The shut-off valve according to claim 1, characterized in that, The copper layer is formed by laser cladding of copper alloy, and the inner wall of the valve cavity is made of steel alloy.

3. The shut-off valve according to claim 1, characterized in that, The through hole includes a transverse hole that penetrates the valve core in the radial direction and a longitudinal hole that communicates with the middle of the transverse hole. Both ends of the transverse hole are connected to the valve cavity. The longitudinal hole extends along the length of the valve core and one end is connected to the spring cavity.

4. The shut-off valve according to claim 1, characterized in that, A valve core seal is provided between the valve core and the cavity wall of the valve chamber.

5. The shut-off valve according to claim 1, characterized in that, The valve sleeve includes a main valve sleeve and a floating valve sleeve connected to each other. The main valve sleeve is provided with the spring cavity, and the valve cover is connected to the main valve sleeve. The valve cavity is formed between the main valve sleeve and the floating valve sleeve. The floating valve sleeve is provided with the pressure relief hole, a first opening, and a second opening.

6. The shut-off valve according to claim 5, characterized in that, A sealing nut is provided on the outside of the adjusting screw, and the sealing nut seals the connection between the adjusting screw and the end cover; a waterproof O-ring is provided at the connection between the valve sleeve and the end cover; a waterproof O-ring is provided between the positioning member and the cavity wall of the spring cavity; a retaining ring is provided at the connection between the main valve sleeve and the floating valve sleeve; a retaining ring and a waterproof O-ring are provided on the outside of the floating valve sleeve.

7. The shut-off valve according to claim 1, characterized in that, The positioning component is provided with a positioning shaft, which is fitted into the end of the spring.

8. The shut-off valve according to claim 1, characterized in that, The floating valve sleeve has a positioning sleeve at a position relative to the end of the valve core, and a one-way spring is provided inside the positioning sleeve. One end of the valve core abuts against the one-way spring.

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