Stop valve

Abstract

The invention discloses a stop valve, and relates to the field of valves. A stop valve comprises a valve seat, a valve cover, a support, a lead screw and a sealing valve column, the liquid inlet end and the liquid outlet end of the valve seat are fixedly connected with liquid conveying pipelines on the two sides through flange plates and bolts respectively, the valve cover is fixedly installed on the valve seat through bolts, the support is fixedly installed on the valve cover, the sealing valve column is arranged in the valve seat, and the lead screw is fixedly installed on the support. The lead screw is fixedly connected to the upper end of the sealing valve column, the upper end of the lead screw upwards penetrates through the valve cover, and the double-opening sleeve is rotationally connected to the support; the operation difficulty of resisting fluid pressure when the valve is opened manually is effectively reduced, the downward pressure of fluid becomes assistance during closing, a worker only needs to reversely rotate the rotating wheel to achieve smooth downward movement of the sealing valve column, operation is convenient and fast, tighter sealing can be achieved through the fluid pressure, and the reliability after the valve is closed is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, and in particular relates to a stop valve. Background Art

[0002] As a key device for controlling the flow of fluids in industrial pipeline systems, stop valves are widely used in the fields of petroleum, chemical industry, electric power, water supply and drainage, etc. Traditional stop valves are mainly driven by manual, electric or pneumatic means. Among them, manual stop valves occupy an important position in pipeline systems due to their simple structure, low cost and easy maintenance. Their working principle is usually to drive the sealing valve column up and down by rotating the screw to open or close the fluid channel. In order to improve the convenience of operation, some manual stop valves have introduced power-assisting mechanisms such as gear transmission and levers, but the overall operation still relies on direct manual operation to overcome fluid pressure.

[0003] However, in actual applications of traditional manual stop valves, when the fluid pressure in the pipeline is high, the downward pressure on the sealing valve column increases significantly, and the operator needs to apply a large torque to rotate the screw, resulting in a laborious and inefficient opening process. This problem is particularly prominent in large-diameter valves or high-pressure systems. In addition, although some improved stop valves use hydraulic or pneumatic auxiliary drives, they require additional power sources and complex control systems, which not only increase equipment costs and maintenance difficulties, but also have problems such as high energy consumption and poor adaptability. In view of this, the present invention is specially proposed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a stop valve that can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a stop valve, including a valve seat, a valve cover, a bracket, a screw rod and a sealing valve column, the liquid inlet end and the liquid outlet end of the valve seat are respectively fixedly connected to the liquid delivery pipes on both sides by flanges and bolts, the valve cover is fixedly mounted on the valve seat by bolts, the bracket is fixedly mounted on the valve cover, the sealing valve column is arranged in the valve seat, the screw rod is fixedly connected to the upper end of the sealing valve column, the upper end of the screw rod upwardly penetrates the valve cover, and further includes: a double-opening sleeve, which is rotatably connected to the bracket, and the upper end of the screw rod is threadedly connected In the double-opening sleeve, a rotating wheel is fixedly connected to the double-opening sleeve; the arc-shaped protrusions are symmetrically fixedly connected to the lower ends of both sides of the screw rod, and the valve cover and the bracket are both provided with arc-shaped sliding grooves used in conjunction with the arc-shaped protrusions, and the screw rod is connected to the valve cover and the bracket by sliding up and down through the arc-shaped protrusions; a gear is installed on the double-opening sleeve, and a ratchet is installed between the gear and the double-opening sleeve; a rack is laterally movably arranged on one side of the bracket and meshes with the gear; a fixed plate is fixedly connected to one side of the rack; and a tension spring has its two ends respectively connected to the bracket and the fixed plate.

[0006] In order to facilitate the use of fluid medium to control the movement of the rack, it further includes a driving cylinder, which is installed on the side of the bracket away from the fixed plate, and a piston disk is slidably connected in the driving cylinder. One end of the rack away from the fixed plate extends into the driving cylinder and is fixedly connected to the piston disk. The side of the valve seat close to the liquid inlet end is fixedly connected with an infusion valve tube, the liquid outlet of the infusion valve tube is connected with the liquid inlet of the driving cylinder, and the liquid outlet of the driving cylinder is fixedly connected with a discharge valve tube. A return liquid port is provided on the side of the valve seat close to the liquid outlet end, and the liquid outlet of the discharge valve tube is connected with the return liquid port of the valve seat.

[0007] In order to further improve the labor-saving effect when moving the sealing valve column upward, the infusion valve tube is a three-way tube, and a liquid inlet is provided on the side of the valve seat close to the liquid outlet end. The liquid outlet of another branch tube of the infusion valve tube is connected to the liquid inlet of the valve seat close to the liquid outlet end, and solenoid valves are installed on both branch tubes of the infusion valve tube.

[0008] In order to ensure the stability of the engagement between the rack and the gear, further, two limit plates are symmetrically fixedly connected to the side of the bracket close to the rack, the rack is slidably connected to the through-holes opened on the two limit plates, and the driving cylinder is fixedly connected to the limit plate on the same side.

[0009] In order to facilitate real-time monitoring of the displacement distance of the rack, the tension spring is further sleeved on the rack, and its two ends are fixedly connected to the limit plate and the fixed plate respectively. A rangefinder is fixedly connected to one side of the fixed plate, and the detection end of the rangefinder faces the bracket.

[0010] In order to facilitate the wrapping constraint of the edge of the flange, prevent the flange from being dislocated or deformed during installation or operation, ensure that the sealing gasket is evenly stressed, and avoid the risk of local leakage, further, the liquid inlet and outlet ends of the valve seat are both provided with limit covers, and the limit covers are connected to the flange on the infusion pipeline through threads.

[0011] In order to facilitate improving the tightness of the fit between the two flanges, further, an annular liquid bag is fixedly connected to one side of the flange on the liquid inlet and outlet ends of the valve seat inside the two limit covers, the liquid outlet of the drain valve tube is connected to the liquid inlet of the annular liquid bag on the same side, and the two annular liquid bags are connected to each other through a connecting pipe, and the liquid outlet of the annular liquid bag near the liquid outlet end of the valve seat is fixedly connected to a drain pipe, and a one-way valve is installed at the liquid inlet of the drain pipe, and the liquid outlet of the drain pipe is connected to the liquid inlet of the valve seat near the liquid outlet end.

[0012] In order to further improve the sealing performance between the two flanges, the diameter of the flange on the liquid infusion channel is further larger than the diameter of the flange at the liquid inlet end and the liquid outlet end of the valve seat.

[0013] After adopting the above technical solution, the present invention has the following advantages compared with the prior art: When opening the valve, the fluid is first introduced into the drive cylinder through the infusion valve tube, pushing the piston disc and rack to move and complete the pre-action. Then, the rack moves back under the action of the tension spring. The one-way transmission characteristics of the gear and ratchet provide power to the rotating wheel, effectively reducing the difficulty of manually opening the valve against the fluid pressure. Even under high-pressure conditions, the opening action can be easily completed. The combination of the arc-shaped protrusion and the arc-shaped slide groove ensures the stability of the screw movement, avoids sticking, and ensures smooth operation. At the same time, the fluid in the drive cylinder flows back to the liquid outlet end of the valve seat through the discharge valve tube, forming a circulation path and optimizing energy utilization. When closing, the downward pressure of the fluid itself becomes a power assist. The operator only needs to reverse the wheel to achieve the smooth downward movement of the sealing valve stem under the combined action of the threaded transmission and fluid pressure. Not only is the operation convenient, but the fluid pressure can also achieve a tighter seal, improving the reliability of the valve after closing. The overall design not only reduces the manual operation intensity but also optimizes the valve operation efficiency, meeting the needs of energy-saving and high-efficiency industrial equipment.

[0014] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In the attached figure:

[0016] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0017] Figure 2The structure of the present invention is schematically shown Figure 2 ;

[0018] Figure 3 This is a schematic diagram of the structure inside the valve body of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure inside the driving cylinder of the present invention;

[0020] Figure 5 It is a schematic cross-sectional view of the present invention;

[0021] Figure 6 It is a schematic diagram of the structure among the sealing valve column, the screw rod and the limiting protrusion of the present invention.

[0022] In the figure: 1. Valve seat; 2. Valve cover; 3. Bracket; 301. Limit plate; 4. Screw rod; 401. Arc-shaped protrusion; 5. Sealing valve column; 6. Double-opening sleeve; 601. Rotor; 602. Ratchet; 603. Gear; 7. Drive cylinder; 701. Piston disc; 702. Rack; 703. Fixed plate; 704. Tension spring; 705. Distance meter; 8. Infusion valve tube; 9. Limit cover; 901. Annular liquid sac; 902. Drain valve tube; 903. Connecting tube; 904. Drain tube. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0024] Example 1:

[0025] Reference Figure 1 、 Figure 3 、 Figure 4 、 Figure 6A stop valve includes a valve seat 1, a valve cover 2, a bracket 3, a screw rod 4 and a sealing valve column 5. The liquid inlet and liquid outlet ends of the valve seat 1 are respectively connected to the liquid delivery pipes on both sides through flanges and bolts. The valve cover 2 is fixedly installed on the valve seat 1 by bolts, and the bracket 3 is fixedly installed on the valve cover 2. The sealing valve column 5 is arranged in the valve seat 1, and the screw rod 4 is fixedly connected to the upper end of the sealing valve column 5. The upper end of the screw rod 4 upwardly penetrates the valve cover 2, and further includes: a double-opening sleeve 6, which is rotatably connected to the bracket 3, and the upper end of the screw rod 4 is threadedly connected to the double-opening sleeve 6. The double-opening sleeve 6 is fixedly connected with a runner 601 ; The arc-shaped protrusions 401 are symmetrically fixedly connected to the lower ends of both sides of the screw rod 4. The valve cover 2 and the bracket 3 are both provided with arc-shaped sliding grooves for use with the arc-shaped protrusions 401. The screw rod 4 is connected to the valve cover 2 and the bracket 3 by sliding up and down through the arc-shaped protrusions 401; the gear 603 is installed on the double-opening sleeve 6, and a ratchet 602 is installed between the gear 603 and the double-opening sleeve 6; the rack 702 is laterally movably arranged on one side of the bracket 3 and meshes with the gear 603; the fixed plate 703 is fixedly connected to one side of the rack 702; the tension spring 704 is respectively connected to the bracket 3 and the fixed plate 703 at both ends.

[0026] It also includes a driving cylinder 7, which is installed on the side of the bracket 3 away from the fixed plate 703. A piston disk 701 is slidably connected to the driving cylinder 7. One end of the rack 702 away from the fixed plate 703 extends into the driving cylinder 7 and is fixedly connected to the piston disk 701. The side of the valve seat 1 close to the liquid inlet end is fixedly connected with an infusion valve tube 8, and the liquid outlet of the infusion valve tube 8 is connected to the liquid inlet of the driving cylinder 7. The liquid outlet of the driving cylinder 7 is fixedly connected with a drain valve tube 902. A return liquid port is provided on the side of the valve seat 1 close to the liquid outlet end, and the liquid outlet of the drain valve tube 902 is connected to the return liquid port of the valve seat 1.

[0027] Before use, the stop valve is first placed between the two infusion pipes, and then the two adjacent flanges are fixedly connected by bolts. After fixed installation, when the sealing valve column 5 needs to be opened to allow fluid to flow, the infusion valve tube 8 is first operated to open. Since there is fluid inside the infusion pipe connected to the liquid inlet end of the valve seat 1, after the infusion valve tube 8 is opened, the fluid in the valve seat 1 near the liquid inlet end enters the driving cylinder 7 through the infusion valve tube 8 due to the pressure difference. As the fluid medium in the driving cylinder 7 continues to accumulate, the pressure generated by the fluid gradually increases, and the thrust exerted on the piston disc 701 overcomes the tension of the tension spring 704 and begins to slide to the side away from the driving cylinder 7. Since the piston disc 701 is fixedly connected to the rack 702, the piston disc 701 will drive the rack 702 to move synchronously in the direction away from the driving cylinder 7. During this process, due to the presence of the ratchet 602 between the gear 603 and the double-opening sleeve 6, the gear 603 rotates idly and will not drive the double-opening sleeve 6 to rotate, only realizing the unidirectional movement pre-action of the rack 702.

[0028] After the rack 702 moves to the farthest end, the staff drives the double-opening sleeve 6 to rotate by rotating the wheel 601. Since the upper end of the screw rod 4 is threadedly connected to the double-opening sleeve 6, and the screw rod 4 cooperates with the arc-shaped protrusion 401 and the arc-shaped slide groove of the valve cover 2 and the bracket 3, it can slide up and down. When the double-opening sleeve 6 rotates, the screw rod 4 drives the sealing valve column 5 to move upward under the action of the thread and the guidance of the arc-shaped protrusion 401 and the slide groove. At the same time, the staff operates to open the valve on the drain valve pipe 902, and the fluid medium in the drive cylinder 7 flows to the liquid outlet side of the valve seat 1 through the drain valve pipe 902, completing the The fluid in the driving cylinder 7 is discharged. After the fluid in the driving cylinder 7 is discharged and the piston disc 701 is no longer subjected to a large thrust, the rack 702 moves back toward the driving cylinder 7 under the tension of the tension spring 704. During the back movement of the rack 702, the gear 603 engaged with the rack 702 rotates. Due to the one-way transmission characteristics of the ratchet 602, the rotation of the gear 603 can drive the double-opening sleeve 6 to rotate in the same direction, providing assistance for the staff to rotate the wheel 601, allowing the staff to more easily continue to move the sealing valve column 5 up until the internal channel of the stop valve is opened to an appropriate degree to meet the fluid circulation requirements.

[0029] When it is necessary to close the stop valve, the staff reverses the wheel 601. Since the fluid medium continues to exert downward pressure on the sealing valve column 5, the sealing valve column 5 will move downward smoothly under the threaded transmission of the screw rod 4 and the double-opening sleeve 6, and gradually close the channel in the valve seat 1. In this process, the downward pressure of the fluid assists the sealing valve column 5 to move downward. Without additional assistance, the stop valve can be closed to block the fluid flow.

[0030] In a traditional manual stop valve, when the screw rod 4 is manually turned to control the sealing valve column 5 to rise, the downward pressure of the fluid is completely resisted by manpower, which makes the operation difficult. The stop valve uses the fluid's own pressure to first introduce the fluid into the drive cylinder 7 through the infusion valve tube 8, pushing the piston disc 701 and the rack 702 to move to complete the pre-action. Subsequently, the rack 702 moves back to cooperate with the gear 603 and ratchet 602 structure to provide assistance for rotating the wheel 601. This design allows the staff to open the stop valve without having to overcome the entire downward pressure of the fluid on the sealing valve column 5 alone, significantly reducing the operating force required. Even under working conditions with high fluid pressure, the valve can be opened relatively easily, improving operational convenience and efficiency.

[0031] The cooperation between the arc-shaped protrusion 401 and the arc-shaped slide groove provides precise guidance for the up and down movement of the screw rod 4, avoiding deviation and jamming of the screw rod 4 during movement, ensuring that the sealing valve column 5 moves up and down stably and smoothly, and ensuring the reliability of the opening and closing action of the stop valve. The ratchet 602 realizes the one-way transmission of the gear 603 and the double-opening sleeve 6, so that the rack 702 does not interfere with the initial state of the double-opening sleeve 6 when moving away from the driving cylinder 7, and can effectively assist when moving back, thereby improving the overall operating stability of the stop valve.

[0032] The fluid in the drive cylinder 7 flows back to the liquid outlet side of the valve seat 1 through the drain valve tube 902, forming a small fluid circulation path, avoiding fluid waste, and to a certain extent utilizing the fluid's own energy to assist valve operation, reducing the costs and risks that may be caused by the introduction of additional power sources.

[0033] Example 2:

[0034] Reference Figure 1 、 Figure 2 、 Figure 4 , a stop valve, which is basically the same as Example 1, furthermore, the infusion valve tube 8 is a three-way tube, and a liquid inlet is opened on the side of the valve seat 1 near the liquid outlet end, and the liquid outlet of another branch tube of the infusion valve tube 8 is connected to the liquid inlet of the valve seat 1 near the liquid outlet end, and solenoid valves are installed on both branch tubes of the infusion valve tube 8.

[0035] By designing the infusion valve tube 8 as a three-way tube, and connecting its other branch tube to the liquid outlet end of the valve seat 1, and installing solenoid valves on both branch tubes, active regulation of the fluid pressure can be achieved when opening the sealing valve column 5. When the valve needs to be opened, the control system synchronously opens the solenoid valve of the branch tube connected to the liquid outlet end of the valve seat 1, so that part of the high-pressure fluid is directly diverted from the liquid inlet end to the liquid outlet end, quickly balancing the pressure difference between the upstream and downstream of the valve seat 1, reducing the fluid pressure acting on the sealing valve column 5, reducing the resistance during manual operation, and further improving the efficiency of the staff in opening the valve.

[0036] Example 3:

[0037] Reference Figure 1 、 Figure 2, a stop valve, which is basically the same as Example 2, is further characterized in that two limit plates 301 are symmetrically fixedly connected to one side of the bracket 3 near the rack 702, and the rack 702 is slidably connected to the through-holes opened on the two limit plates 301. The driving cylinder 7 is fixedly connected to the limit plates 301 on the same side. The two limit plates 301 symmetrically arranged on the side of the bracket 3 near the rack 702 provide precise guidance and limitation for the linear reciprocating motion of the rack 702 by opening a through-hole adapted to the rack 702, effectively avoiding the rack 702 from being affected by the piston disc 701. When the push-pull or tension spring 704 acts, it deviates and twists, ensuring that the rack 702 always remains vertically aligned with the gear 603 and maintains a stable meshing state. Whether the fluid in the drive cylinder 7 pushes the rack 702 to move, or the tension spring 704 drives the rack 702 to move back to assist in opening the valve, the limit plate 301 can ensure the reliability of the transmission between the gear 603 and the rack 702, avoid jamming and tooth disengagement caused by misalignment, thereby improving the stability and service life of the entire valve drive system, and ensuring that the stop valve can still operate efficiently under frequent operations.

[0038] The tension spring 704 is sleeved on the rack 702, and its two ends are fixedly connected to the limit plate 301 and the fixed plate 703 respectively. A rangefinder 705 is fixedly connected to one side of the fixed plate 703, and the detection end of the rangefinder 705 faces the bracket 3. The tension spring 704 is sleeved on the rack 702, and its two ends are fixedly connected to the limit plate 301 and the fixed plate 703 respectively, which ensures that the direction of the spring tension is consistent with the direction of movement of the rack 702, so that the rack 702 can move back accurately and stably under the action of the spring reset force after the fluid pressure in the driving cylinder 7 disappears, and continuously provides assistance for the rotation of the gear 603. The fixing function of the limit plate 301 prevents the spring from offsetting during the stretching or contraction process, ensuring the stability of the linear motion of the rack 702. At the same time, the rangefinder 705 added to one side of the fixed plate 703, with its detection end facing the bracket 3, can monitor the displacement distance of the rack 702 in real time, and accurately judge the position of the piston disk 701 in the drive cylinder 7 through feedback data, thereby intuitively reflecting the degree of valve opening, making it easier for operators to grasp the valve status, and can also provide timely warnings when the equipment is abnormal (such as the rack 702 is stuck or the spring fails), assist in quickly locating faults, and significantly improve the reliability and intelligence level of the stop valve operation.

[0039] Example 4:

[0040] Reference Figure 4 、 Figure 5, a stop valve is basically the same as Example 3, furthermore, a limit cover 9 is sleeved on the liquid inlet end and the liquid outlet end of the valve seat 1, and the limit cover 9 is connected to the flange on the infusion pipe by a thread. The limit cover 9 sleeved on the liquid inlet end and the liquid outlet end of the valve seat 1 is tightly connected to the flange on the infusion pipe by a thread, thereby improving the sealing stability between the valve seat 1 and the infusion channel. The threaded connection method not only provides a strong axial fastening force, so that the flanges fit tightly, but also can adjust the degree of compression of the sealing surface by moderate tightening. At the same time, the limit cover 9 forms a wrapping constraint on the edge of the flange, preventing the flange from being dislocated or deformed during installation or operation, ensuring that the sealing gasket is evenly stressed, avoiding the risk of local leakage, ensuring long-term and stable operation of the stop valve under complex working conditions such as high pressure and high flow rate, effectively reducing leakage hazards, and ensuring the safety and reliability of the fluid delivery system.

[0041] The two limiting covers 9 are fixedly connected to one side of the flange on the liquid inlet and liquid outlet ends of the valve seat 1, and the liquid outlet of the drain valve tube 902 is connected to the liquid inlet of the annular liquid bag 901 on the same side. The two annular liquid bags 901 are connected to each other through a connecting pipe 903. The liquid outlet of the annular liquid bag 901 on the side of the liquid outlet end of the valve seat 1 is fixedly connected to a drain pipe 904. A one-way valve is installed at the liquid inlet of the drain pipe 904. The liquid outlet of the drain pipe 904 is connected to the liquid inlet of the valve seat 1 near the liquid outlet end. The design of arranging an annular liquid bag 901 in the limiting cover 9 and communicating with the drain valve tube 902 can cause the fluid medium discharged by the driving cylinder 7 to expand synchronously during the valve opening process. The sealing performance between the valve seat 1 and the flange of the liquid delivery pipeline is greatly enhanced. The expanded annular liquid sac 901 can not only apply uniform radial pressure at the flange connection, fill tiny gaps, and eliminate leakage risks caused by installation errors or changes in working conditions, but also form a semi-wrapped constraint on the connecting bolts, and use the lateral force generated by the fluid pressure to suppress the loosening trend of the bolts. In addition, the annular liquid sac 901 achieves pressure balance through the connecting pipe 903 to ensure consistent sealing effects at both ends, and the loop formed by the one-way valve and the drain pipe 904 allows excess fluid to flow back to the liquid outlet end of the valve seat 1 in an orderly manner, which not only avoids pressure accumulation affecting the stability of the system, but also realizes the recycling of the fluid. While improving the sealing reliability, it ensures the safety and sealing of the long-term operation of the stop valve.

[0042] The diameter of the flange on the infusion channel is larger than the diameter of the flange at the liquid inlet and liquid outlet of the valve seat 1. The design of the flange on the infusion channel being larger than the diameter of the flange at the liquid inlet and liquid outlet of the valve seat 1 is cleverly coordinated with the structure of the annular liquid sac 901, which significantly improves the sealing performance. When the annular liquid sac 901 is expanded by the fluid medium discharged by the driving cylinder 7, part of the liquid sac that exceeds the flange range of the valve seat 1 will naturally fill the cavity between the large and small flanges and the limit cover 9. The extension of the liquid sac in the cavity forms multiple sealing barriers, further enhancing the barrier effect on the fluid and effectively preventing medium leakage. In addition, the liquid sac filling the cavity can also play a buffering and shock-absorbing role on the flange connection, reducing the impact of fluid impact or pipeline vibration on the sealing structure, thereby maintaining excellent sealing stability under complex working conditions and extending the service life of the stop valve.

[0043] The above description is merely a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above with the preferred embodiment, it is not intended to limit the present invention.

Claims

1. A stop valve, comprising a valve seat (1), a valve cover (2), a bracket (3), a screw rod (4) and a sealing valve column (5), wherein the liquid inlet end and the liquid outlet end of the valve seat (1) are respectively fixedly connected to the liquid delivery pipes on both sides by flanges and bolts, the valve cover (2) is fixedly mounted on the valve seat (1) by bolts, the bracket (3) is fixedly mounted on the valve cover (2), the sealing valve column (5) is arranged in the valve seat (1), the screw rod (4) is fixedly connected to the upper end of the sealing valve column (5), and the upper end of the screw rod (4) passes through the valve cover (2) upward, characterized in that Also includes: A double-opening sleeve (6) is rotatably connected to the bracket (3), the upper end of the screw rod (4) is threadedly connected to the double-opening sleeve (6), and a rotating wheel (601) is fixedly connected to the double-opening sleeve (6); The arc-shaped protrusions (401) are symmetrically fixedly connected to the lower ends of both sides of the screw rod (4); the valve cover (2) and the bracket (3) are both provided with arc-shaped sliding grooves for use with the arc-shaped protrusions (401); the screw rod (4) is connected to the valve cover (2) and the bracket (3) by sliding up and down through the arc-shaped protrusions (401); A gear (603) is mounted on the double-opening sleeve (6), and a ratchet (602) is mounted between the gear (603) and the double-opening sleeve (6); a rack (702) movably disposed laterally on one side of the bracket (3) and meshing with the gear (603); a fixed plate (703) fixedly connected to one side of the rack (702); The tension spring (704) has two ends connected to the bracket (3) and the fixing plate (703) respectively.

2. A stop valve according to claim 1, characterized in that: The invention also includes a driving cylinder (7), which is installed on a side of the bracket (3) away from the fixed plate (703), and a piston disc (701) is slidably connected in the driving cylinder (7), and one end of the rack (702) away from the fixed plate (703) extends into the driving cylinder (7) and is fixedly connected to the piston disc (701). A side of the valve seat (1) close to the liquid inlet end is fixedly connected to a liquid infusion valve tube (8), and the liquid outlet of the liquid infusion valve tube (8) is connected to the liquid inlet of the driving cylinder (7). A discharge valve tube (902) is fixedly connected to the liquid outlet of the driving cylinder (7), and a return liquid port is provided on a side of the valve seat (1) close to the liquid outlet end, and the liquid outlet of the discharge valve tube (902) is connected to the return liquid port of the valve seat (1).

3. A stop valve according to claim 2, characterized in that: The infusion valve tube (8) is a three-way tube, and a liquid inlet is provided on one side of the valve seat (1) close to the liquid outlet end. The liquid outlet of another branch tube of the infusion valve tube (8) is connected to the liquid inlet of the valve seat (1) close to the liquid outlet end. Solenoid valves are installed on both branch tubes of the infusion valve tube (8).

4. A stop valve according to claim 2, characterized in that: Two limiting plates (301) are symmetrically fixedly connected to one side of the bracket (3) close to the rack (702); the rack (702) is slidably connected to through openings provided on the two limiting plates (301); and the driving cylinder (7) is fixedly connected to the limiting plate (301) on the same side.

5. A stop valve according to claim 4, characterized in that: The tension spring (704) is sleeved on the rack (702), and its two ends are fixedly connected to the limit plate (301) and the fixed plate (703), respectively. A rangefinder (705) is fixedly connected to one side of the fixed plate (703), and the detection end of the rangefinder (705) faces the bracket (3).

6. A stop valve according to claim 2, characterized in that: The liquid inlet end and the liquid outlet end of the valve seat (1) are both sleeved with a limit cover (9), and the limit cover (9) is connected to the flange on the liquid delivery pipeline through a threaded connection.

7. A stop valve according to claim 6, characterized in that: An annular liquid capsule (901) is fixedly connected to one side of the flange on the liquid inlet and liquid outlet ends of the two limit covers (9), the liquid outlet of the discharge valve tube (902) is connected to the liquid inlet of the annular liquid capsule (901) on the same side, and the two annular liquid capsules (901) are connected to each other through a connecting tube (903). A discharge pipe (904) is fixedly connected to the liquid outlet of the annular liquid capsule (901) on the side close to the liquid outlet end of the valve seat (1), and a one-way valve is installed at the liquid inlet of the discharge pipe (904). The liquid outlet of the discharge pipe (904) is connected to the liquid inlet of the valve seat (1) close to the liquid outlet end.

8. A stop valve according to claim 7, characterized in that: The diameter of the flange on the liquid infusion channel is larger than the diameter of the flange at the liquid inlet end and the liquid outlet end of the valve seat (1).

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