Leak-proof valve

Abstract

The invention relates to the field of valves, in particular to an anti-leakage valve which comprises a valve body, and an anti-leakage unit is arranged on a valve cover of the valve body. The anti-leakage unit comprises a barrel fixedly connected to the valve deck, and the axis of the barrel and a valve rod of the valve body are coaxially arranged. An end cover is arranged at the upper end of the barrel, a through hole is formed in the middle of the end cover, and a driving rod is arranged in the through hole; the designed anti-leakage unit and the valve body are arranged into a whole, the barrel in the anti-leakage unit is used for containing media leaking from the position between the valve rod and the valve cover, and the media can be temporarily stored in the barrel and are prevented from leaking and flowing out to pollute the natural environment; and the essence of the anti-leakage unit is that the traditional valve is endowed with double functions of preventing medium leakage, that is, the traditional sealing filler between the valve rod and the valve cover has a first anti-leakage function, and the anti-leakage unit is matched with the valve cover to have a second anti-leakage function, so that the anti-leakage effect of the traditional valve is improved.

Description

Technical Field

[0001] The invention relates to the field of valves, in particular to an anti-leakage valve. Background Art

[0002] As a common pipeline accessory, valves play a vital role in many fields such as industrial production and daily life. They are mainly used to open and close pipelines, control flow direction, and adjust and control the parameters of the conveying medium (such as temperature, pressure and flow rate, etc.). However, traditional valves often face leakage problems, which not only lead to energy waste, but also may pollute the environment and even cause safety accidents. Especially in some special working conditions with extremely high requirements for sealing performance, such as chemical, petroleum, natural gas and other industries, the leakage problem of valves has attracted much attention.

[0003] In actual application, leakage between the valve stem and the valve cover occurs frequently, which not only leads to waste of energy, but also may pollute the environment and even cause safety accidents if the leaked medium has the risk of polluting the environment.

[0004] Therefore, how to effectively solve the leakage problem between the valve stem and the valve cover has become a technical problem that needs to be solved urgently in the field of valve design and manufacturing.

[0005] Therefore, an anti-leakage valve is proposed to solve the above problems. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: the anti-leakage valve described in the present invention comprises a valve body, and the valve cover of the valve body is provided with an anti-leakage unit;

[0008] The anti-leakage unit comprises a cylinder fixedly connected to the valve cover, and the axis of the cylinder is coaxially arranged with the valve stem of the valve body;

[0009] An end cover is provided at the upper end of the cylinder, a through hole is provided in the middle of the end cover, and a driving rod is provided in the through hole; a ring-shaped groove is provided on the lower surface of the end cover, and a tension spring is provided in the groove, the tension spring is sleeved on the driving rod, and the end of the tension spring is connected to the outer ring of the driving rod;

[0010] The lower end of the driving rod is provided with a hexagonal prism, and the upper end of the valve stem is provided with a socket adapted to the hexagonal prism;

[0011] A truncated cone is provided at the connection position between the driving rod and the tension spring, and a ring-shaped sealing groove is provided on the upper surface of the edge of the truncated cone; a ring-shaped sealing strip is provided on the lower surface of the end cover, and the sealing strip is used to seal the sealing groove.

[0012] Preferably, a cylindrical boss is provided on the upper surface of the end cover, the through hole passes through the boss, and the groove passes upward into the boss.

[0013] Preferably, an annular groove is provided on the outer ring of the driving rod, a ring body is rotatably connected in the annular groove, and the end of the tension spring is fixedly connected to the upper surface of the ring body.

[0014] Preferably, a locking nut is provided above the end cover, and the locking nut is threadedly connected to the driving rod.

[0015] Preferably, a plurality of telescopic holes are provided at eccentric positions on the upper surface of the boss, the lower end of each telescopic hole is connected to a hollow sealing strip inside, a piston rod is provided in each telescopic hole, the lower end of the piston rod is connected to the telescopic hole through a spring, and the upper end of the piston rod is arranged opposite to the lower surface of the locking nut.

[0016] Preferably, the hexagonal prism moves up and down along the inside of the socket.

[0017] Preferably, a ball groove is provided on the upper end surface of each piston rod, and a ball is arranged in the ball groove.

[0018] Preferably, a secondary pipe is provided between the cylinder and the outlet end of the valve body, and the secondary pipe is connected to a branch pipe.

[0019] Preferably, a support assembly is provided on the cylinder, and the support assembly includes a limiting ring fixedly connected to the outer ring of the cylinder, and clamps are symmetrically provided inside the limiting ring. Support legs are provided on the outer ring of each clamp, and the support legs are supported on the ground.

[0020] Preferably, an extension leg is sleeved on the end of each supporting leg.

[0021] The present invention is beneficial in that:

[0022] 1. In the present invention, the designed anti-leakage unit is integrated with the valve body, and the cylinder in the anti-leakage unit is used to contain the medium leaked from between the valve stem and the valve cover. The medium can be temporarily stored in the cylinder to prevent the medium from leaking out and polluting the natural environment. The essence of the anti-leakage unit is to give the traditional valve a dual function of preventing medium leakage, that is, the traditional sealing packing between the valve stem and the valve cover is the first anti-leakage function, and the anti-leakage unit cooperates with the valve cover as the second anti-leakage function, thereby improving the anti-leakage effect of the traditional valve.

[0023] 2. In the present invention, the locking nut is designed so that when the locking nut is tightened, the locking nut will also pull up the driving rod, and the driving rod will drive the truncated cone to be further squeezed on the end cover, that is, the sealing between the sealing strip and the sealing groove is improved, thereby improving the sealing of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a three-dimensional diagram of the coordination of the valve body and the anti-leakage unit in the present invention;

[0025] Figure 2 This is a front view of the matching of the valve body and the anti-leakage unit in the present invention;

[0026] Figure 3 It is a cross-sectional view of the matching of the valve body and the anti-leakage unit in the present invention;

[0027] Figure 4 is a cross-sectional view of the valve body of the present invention;

[0028] Figure 5 A three-dimensional diagram of the valve body of the present invention;

[0029] Figure 6 is a three-dimensional diagram of the anti-leakage unit in the present invention;

[0030] Figure 7 It is a front view of the anti-leakage unit in the present invention;

[0031] Figure 8 is a three-dimensional diagram of the driving rod in the present invention;

[0032] Fig. 9 is a three-dimensional diagram of the end cover of the present invention;

[0033] Fig.10 It is a schematic diagram of the bottom structure of the end cover in the present invention;

[0034] Fig.11 It is a three-dimensional diagram of the support assembly in the present invention.

[0035] In the figure: 1. valve body; 2. cylinder; 3. end cover; 4. through hole; 5. drive rod; 6. groove; 7. tension spring; 8. hexagonal prism; 9. valve stem; 10. socket; 11. frustum; 12. sealing groove; 13. sealing strip; 14. boss; 15. annular groove; 17. locking nut; 16. ring body; 18. telescopic hole; 19. piston rod; 20. auxiliary pipe; 21. branch pipe; 22. ball valve; 23. limit ring; 24. clamp; 25. support leg; 26. extension leg. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0037] Reference Figure 1 - Fig.10, a leakage-proof valve, comprising a valve body 1, a valve cover of the valve body 1 is provided with an anti-leakage unit; the anti-leakage unit comprises a cylinder 2 fixedly connected to the valve cover, the axis of the cylinder 2 is coaxially arranged with the valve stem 9 of the valve body 1; an end cover 3 is provided at the upper end of the cylinder 2, a through hole 4 is provided in the middle of the end cover 3, and a driving rod 5 is provided in the through hole 4; a ring-shaped groove 6 is provided on the lower surface of the end cover 3, a tension spring 7 is provided in the groove 6, the tension spring 7 is sleeved on the driving rod 5, and the end of the tension spring 7 is connected to the outer ring of the driving rod 5; a hexagonal prism 8 is provided at the lower end of the driving rod 5, and a socket 10 adapted to the hexagonal prism 8 is provided at the upper end of the valve stem 9; the driving rod 5 and the tension spring 7 are connected. A truncated cone 11 is provided at the connection position, and a ring-shaped sealing groove 12 is provided on the upper surface of the edge of the truncated cone 11; a ring-shaped sealing strip 13 is provided on the lower surface of the end cover 3, and the sealing strip 13 is used to seal the sealing groove 12; in this embodiment, the anti-leakage unit is specifically operated as follows: when operating the valve body 1, a socket wrench is put on the hexagonal end of the upper end of the driving rod 5, and the driving rod 5 is pressed down with force, the driving rod 5 drags the tension spring 7 downward, and the lower end of the driving rod 5 is inserted into the jack 10 provided at the upper end of the valve stem 9, and then the socket wrench is rotated, the socket wrench drives the driving rod 5 to rotate, and at the same time the driving rod 5 drives the valve stem 9 to rotate, so as to realize the execution of the valve stem 9, thereby realizing the opening and closing of the valve body 1;

[0038] When the execution of the valve stem 9 is completed, the socket wrench is removed, and the driving rod 5 moves upward and resets under the tension of the tension spring 7 connected to it, and the driving rod 5 drives the round table 11 to move upward, and the sealing groove 12 on the round table 11 is sealed with the sealing strip 13 on the lower surface of the end cover 3. At this time, the cylinder 2 is sealed. When there is a medium leak between the valve stem 9 and the valve cover, the medium will flow into the cylinder 2 in a sealed state, and the medium will be temporarily stored, and the medium leaked into the cylinder 2 will be centrally processed later. The specific processing is as follows: each fastening bolt on the end cover 3 is removed, the end cover 3 and the driving rod 5 are removed, and the medium in the cylinder 2 is removed, and then the sealing between the sealing groove 12 and the sealing strip 13 is checked. If the sealing meets the requirements, the end cover 3 and the driving rod 5 are installed. If the sealing does not meet the requirements, replace the new end cover 3 or the driving rod 5;

[0039] In this embodiment, the anti-leakage unit is designed to be integrated with the valve body 1, and the cylinder 2 in the anti-leakage unit is used to contain the medium leaked from between the valve stem 9 and the valve cover. The medium can be temporarily stored in the cylinder 2 to prevent the medium from leaking out and polluting the natural environment. The essence of the anti-leakage unit is to give the traditional valve a dual function of preventing medium leakage, that is, the traditional sealing packing between the valve stem 9 and the valve cover is the first anti-leakage function, and the anti-leakage unit cooperates with the valve cover to have a second anti-leakage function, thereby improving the anti-leakage effect of the traditional valve;

[0040] As for the sealing between the driving rod 5 and the through hole 4, a plurality of rubber sealing rings are arranged above and below the outer ring of the driving rod 5, and the rubber sealing rings are squeezed between the driving rod 5 and the through hole.

[0041] Reference Figure 1 - Fig.10 The upper surface of the end cover 3 is provided with a cylindrical boss 14, the through hole 4 penetrates the boss 14, and the groove 6 penetrates upward into the boss 14;

[0042] The boss 14 is provided to increase the thickness of the middle area of ​​the end cover 3, extend the depth of the through hole 4, and increase the contact area between the through hole 4 and the driving rod 5, the purpose of which is to further improve the sealing performance of the anti-leakage unit itself. While the sealing strip 13 and the sealing groove 12 play a sealing role, the connection between the driving rod 5 and the through hole 4 also plays a sealing role, providing the sealing performance of the cylinder 2;

[0043] At the same time, the setting of the boss 14 can open a deeper groove 6, so that a longer tension spring 7 can be set in the groove 6. The longer tension spring 7 has a smaller deformation when stretched. If a shorter tension spring 7 is used, in order to meet the downward movement of the drive rod 5, the tension spring 7 needs to be stretched longer and the deformation is larger, which may easily cause the tension spring 7 to be unable to reset, resulting in the sealing strip 13 being unable to effectively seal with the sealing groove 12.

[0044] Reference Figure 1 - Fig.10 The outer ring of the driving rod 5 is provided with an annular groove 15, and a ring body 16 is rotatably connected in the annular groove 15, and the upper surface of the ring body 16 is fixedly connected to the end of the tension spring 7;

[0045] In this embodiment, the upper end of the tension spring 7 is fixed to the top of the groove 6, and the lower end of the tension spring 7 is fixed to the ring body 16. The inner ring of the ring body 16 is rotatably connected to the annular groove 15 provided on the outer ring of the driving rod 5, that is, the tension spring 7 and the driving rod 5 can rotate relative to each other;

[0046] When the driving rod 5 is rotated, if the lower end of the tension spring 7 is fixed to the driving rod 5, the tension spring 7 will twist along with the driving rod 5, causing damage to the tension spring 7. However, the tension spring 7 and the driving rod 5 can rotate relative to each other. When the driving rod 5 rotates, the tension spring 7 will not twist accordingly. The purpose is to protect the tension spring 7, ensure that the tension spring 7 has a stable pulling force, and extend the service life of the tension spring 7.

[0047] Reference Figure 1 - Fig.10 , a locking nut 17 is provided above the end cover 3, and the locking nut 17 is threadedly connected to the driving rod 5;

[0048] The locking nut 17 is provided on the driving rod 5 for locking the driving rod 5, and its purpose is to prevent the upper end of the driving rod 5 from being accidentally squeezed by the external pressure, causing the driving rod 5 to move downward, which will cause the cylinder 2 to lose its sealing performance instantly, and the medium in the cylinder 2 will flow into the through hole 4, polluting the sealing connection between the driving rod 5 and the through hole 4, affecting the sealing performance; when the driving rod 5 is moved up and reset, a socket wrench is used to be set on the hexagonal end of the upper end of the driving rod 5 to constrain the rotation of the driving rod 5, and then the locking nut 17 is rotated with a movable spanner, and the locking nut 17 will cooperate to flatten and squeeze on the boss 14 to lock the axial movement of the driving rod 5. Not only that, while tightening the locking nut 17, the locking nut 17 will also pull up the driving rod 5, and the driving rod 5 will drive the round table 11 to be further squeezed on the end cover 3, that is, improve the sealing performance between the sealing strip 13 and the sealing groove 12, thereby improving the sealing performance of the cylinder 2.

[0049] Reference Figure 1 - Fig.10 A plurality of telescopic holes 18 are provided at eccentric positions on the upper surface of the boss 14, the lower end of each telescopic hole 18 is connected to the hollow sealing strip 13, each telescopic hole 18 is provided with a piston rod 19, the lower end of the piston rod 19 is connected to the telescopic hole 18 through a spring, and the upper end of the piston rod 19 is arranged opposite to the lower surface of the locking nut 17;

[0050] When the locking nut 17 is squeezed onto the boss 14, the locking nut 17 will squeeze the piston rod 19 downwards. The piston rod 19 will squeeze the gas in the telescopic hole 18 into the hollow sealing strip 13, thereby increasing the air pressure in the sealing strip 13. This is also a way to improve the sealing between the sealing strip 13 and the sealing groove 12, thereby improving the sealing of the cylinder 2.

[0051] Reference Figure 4 , the hexagonal column 8 moves up and down along the inside of the socket 10;

[0052] The length of the insertion hole 10 is set to be deep, and the length of the hexagonal prism 8 is set to be large, so that when the driving rod 5 moves up and down, the hexagonal prism 8 is always inserted in the insertion hole 10, that is, the hexagonal prism 8 and the insertion hole 10 are always matched. If the hexagonal prism 8 moves up and disengages from the insertion hole 10, once the driving rod 5 rotates at this time, the hexagonal prism 8 will be difficult to be inserted into the insertion hole 10 when the driving rod 5 moves down next time;

[0053] At the same time, the hexagonal prism 8 is always inserted in the insertion hole 10, which can stabilize the open or closed state of the valve body 1, that is, the drive rod 5 is fastened to the end cover 3 through the locking nut 17, and the up and down movement and rotation of the drive rod 5 are stabilized, and naturally the valve stem 9 and the valve core are stabilized.

[0054] Reference Figure 4 , a ball groove is formed on the upper end surface of each piston rod 19, and a ball is disposed in the ball groove;

[0055] A sphere is provided at the upper end of each piston rod 19 to convert the sliding friction between the piston rod 19 and the locking nut 17 into rolling friction between the locking nut 17 and the sphere, thereby improving the relative sliding smoothness between the locking nut 17 and each piston rod 19, so as to prevent the locking nut 17 from squeezing and tilting the piston rod 19 when rotating, thereby preventing a gap from being generated between the piston rod 19 and the telescopic hole 18, and causing the gas in the telescopic hole 18 to leak from the gap.

[0056] Reference Figure 1 - Figure 5 A secondary pipe 20 is provided between the cylinder 2 and the outlet end of the valve body 1, and a branch pipe 21 is connected to the secondary pipe 20; a ball valve 22 is provided at a position of the secondary pipe 20 near the outlet end of the valve body 1, and a branch pipe 21 is provided at a position of the secondary pipe 20 near the cylinder 2, and a ball valve 22 is also provided on the branch pipe 21;

[0057] The auxiliary pipe 20 is provided to connect the cylinder 2 with the outlet end of the valve body 1, so that the medium in the cylinder 2 can flow back into the valve body 1 along the auxiliary pipe 20;

[0058] A branch pipe 21 is provided on the auxiliary pipe 20, and the branch pipe 21 is used to extract the residual medium in the cylinder 2. For example, when operating the valve body 1 to close, the ball valve 22 on the auxiliary pipe 20 is first closed, and then the ball valve 22 on the branch pipe 21 is opened, so that the medium in the high-pressure state in the cylinder 2 is discharged, ensuring a safe operating environment when operating the driving rod 5;

[0059] The pressure borne by the ball valve 22 connected to the branch pipe 21 and the auxiliary pipe 20 is negligible compared to the pressure borne by the medium flowing through the valve body 1, and there is no need to consider the problem of medium leakage from the ball valve 22.

[0060] Reference Figure 1 - Fig.11 The cylinder 2 is provided with a support assembly, which includes a limit ring 23 fixed to the outer ring of the cylinder 2, and a clamp 24 is symmetrically arranged inside the limit ring 23. A support leg 25 is arranged on the outer ring of each clamp 24, and the support leg 25 is supported on the ground;

[0061] The support assembly is provided to support the valve body 1. When operating the driving rod 5, it is necessary to apply downward pressing force to the driving rod 5. At this time, the pipes connected by the flanges at both ends of the valve body 1 will also be subjected to downward pressure, which is destructive to the sealed connection between the pipe and the flange. For this purpose, a support assembly is provided. The clamp 24 is fixed to the cylinder 2 by means of bolts and nuts, and is constrained between the limit rings 23. The support legs 25 are supported on the ground, and the cylinder 2 together with the valve body 1 are erected on the ground, so that when operating the driving rod 5, the sealed connection between the flange and the pipe can be guaranteed.

[0062] Reference Fig.11 , an extension leg 26 is sleeved on the end of each supporting leg 25;

[0063] The setting of the extension leg 26 can extend the length of the support, and the outer wall of the extension leg 26 is threaded with a bolt, which is used to lock the extension leg 26 and the support leg 25, so that the extension leg 26 and the support leg 25 can adapt to different heights of the valve body 1.

[0064] Working principle:

[0065] In this embodiment, the anti-leakage unit is specifically operated as follows: when operating the valve body 1, a socket wrench is put on the hexagonal end of the upper end of the driving rod 5, and the driving rod 5 is pressed down with force, the driving rod 5 drags the tension spring 7 downward, and the lower end of the driving rod 5 is inserted into the insertion hole 10 set at the upper end of the valve stem 9, and then the socket wrench is rotated, the socket wrench drives the driving rod 5 to rotate, and at the same time the driving rod 5 drives the valve stem 9 to rotate, so as to realize the execution of the valve stem 9, thereby realizing the opening and closing of the valve body 1;

[0066] When the execution of the valve stem 9 is completed, the socket wrench is removed, and the driving rod 5 moves upward and resets under the tension of the tension spring 7 connected to it, and the driving rod 5 drives the round table 11 to move upward, and the sealing groove 12 on the round table 11 is sealed with the sealing strip 13 on the lower surface of the end cover 3. At this time, the cylinder 2 is sealed. When there is a medium leak between the valve stem 9 and the valve cover, the medium will flow into the cylinder 2 in a sealed state, and the medium will be temporarily stored, and the medium leaked into the cylinder 2 will be centrally processed later. The specific processing is as follows: each fastening bolt on the end cover 3 is removed, the end cover 3 and the driving rod 5 are removed, and the medium in the cylinder 2 is removed, and then the sealing between the sealing groove 12 and the sealing strip 13 is checked. If the sealing meets the requirements, the end cover 3 and the driving rod 5 are installed. If the sealing does not meet the requirements, replace the new end cover 3 or the driving rod 5;

[0067] In this embodiment, the designed anti-leakage unit is integrated with the valve body 1, and the cylinder 2 in the anti-leakage unit is used to contain the medium leaked from between the valve stem 9 and the valve cover. The medium can be temporarily stored in the cylinder 2 to prevent the medium from leaking out and polluting the natural environment. The essence of the anti-leakage unit is to give the traditional valve a dual function of preventing medium leakage, that is, the traditional sealing packing between the valve stem 9 and the valve cover is the first anti-leakage function, and the anti-leakage unit cooperates with the valve cover as the second anti-leakage function, thereby improving the anti-leakage effect of the traditional valve.

[0068] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A leak-proof valve, comprising a valve body (1), characterized in that: The valve cover of the valve body (1) is provided with an anti-leakage unit; The anti-leakage unit comprises a cylinder (2) fixedly connected to the valve cover, wherein the axis of the cylinder (2) is coaxially arranged with the valve stem (9) of the valve body (1); An end cover (3) is provided at the upper end of the cylinder (2), a through hole (4) is provided in the middle of the end cover (3), and a driving rod (5) is provided in the through hole (4); a ring-shaped groove (6) is provided on the lower surface of the end cover (3), and a tension spring (7) is provided in the groove (6), the tension spring (7) is sleeved on the driving rod (5), and the end of the tension spring (7) is connected to the outer ring of the driving rod (5); The lower end of the driving rod (5) is provided with a hexagonal prism (8), and the upper end of the valve stem (9) is provided with a socket (10) adapted to the hexagonal prism (8); A truncated cone (11) is provided at the connection position between the driving rod (5) and the tension spring (7), and a ring-shaped sealing groove (12) is provided on the upper surface of the edge of the truncated cone (11); a ring-shaped sealing strip (13) is provided on the lower surface of the end cover (3), and the sealing strip (13) is used to seal and match the sealing groove (12).

2. The anti-leakage valve according to claim 1, characterized in that: A cylindrical boss (14) is provided on the upper surface of the end cover (3), the through hole (4) penetrates the boss (14), and the groove (6) penetrates upward into the boss (14).

3. The anti-leakage valve according to claim 1, characterized in that: The outer ring of the driving rod (5) is provided with an annular groove (15), a ring body (16) is rotatably connected in the annular groove (15), and the upper surface of the ring body (16) is fixedly connected to the end of the tension spring (7).

4. The anti-leakage valve according to claim 2, characterized in that: A locking nut (17) is provided above the end cover (3), and the locking nut (17) is threadedly connected to the driving rod (5).

5. The anti-leakage valve according to claim 2, characterized in that: A plurality of telescopic holes (18) are provided at eccentric positions on the upper surface of the boss (14); the lower end of each telescopic hole (18) is connected to a hollow sealing strip (13) inside; a piston rod (19) is provided in each telescopic hole (18); the lower end of the piston rod (19) is connected to the telescopic hole (18) through a spring; and the upper end of the piston rod (19) is arranged opposite to the lower surface of the locking nut (17).

6. The anti-leakage valve according to claim 1, characterized in that: The hexagonal column (8) moves up and down along the inside of the insertion hole (10).

7. The anti-leakage valve according to claim 5, characterized in that: The upper end surface of each piston rod (19) is provided with a ball groove, in which a ball is arranged.

8. The anti-leakage valve according to claim 1, characterized in that: A secondary pipe (20) is provided between the cylinder (2) and the outlet end of the valve body (1), and a branch pipe (21) is connected to the secondary pipe (20).

9. The anti-leakage valve according to claim 1, characterized in that: The cylinder (2) is provided with a support assembly, the support assembly comprising a limit ring (23) fixedly connected to the outer ring of the cylinder (2), symmetrically arranged clamps (24) inside the limit ring (23), and a support leg (25) is provided on the outer ring of each clamp (24), and the support leg (25) is supported on the ground.

10. The anti-leakage valve according to claim 9, characterized in that: An extension leg (26) is sleeved on the end of each supporting leg (25).

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