Ball valve with rotatable valve seat

Abstract

The invention relates to the field of valves, in particular to a valve seat rotatable ball valve which comprises a valve body, rotating grooves are symmetrically formed in the valve body, the two rotating grooves are symmetrically located on the two sides of a valve ball, and a valve seat is arranged in each rotating groove; each valve seat comprises a body, a conical gear ring is fixedly connected to the end face, close to a port of the valve body, of each body, conical teeth are meshed with one side of each conical gear ring, a rotating shaft is fixedly connected to the upper end face of each conical tooth, and the rotating shafts upwards penetrate through the outside of the valve body and are fixedly connected with a second hand wheel. Compared with the prior art, rotation of the valve seat can be achieved through meshing of the conical teeth and the conical tooth ring, the structure is simple, execution can be stably conducted in the complex medium conveying environment, the ball valve does not need to be detached from a pipeline system, the ball valve does not need to be closed, and a second hand wheel does not need to be rotated in the re-operation mode, operation steps are simple, and operation efficiency is high. And moreover, the influence on medium conveying of the pipeline system can be reduced, and the pause time of equipment or devices connected with the pipeline system is shortened.

Description

Technical Field

[0001] This invention relates to the field of valves, specifically a ball valve with a rotatable seat. Background Technology

[0002] Ball valves, as a type of valve, are widely used in industries such as petroleum, chemical, and metallurgy due to their rapid and easy opening and closing, and high flexibility. During the use of ball valves, seat wear and damage is a common problem. There are several reasons for this, including: media factors: solid particles in the medium, such as mud, sand, and impurities, will cause abrasive wear on the valve seat during opening and closing. Additionally, if the medium is corrosive, it will cause chemical corrosion of the valve seat, accelerating its damage. Operational factors: frequent opening and closing operations will cause continuous friction between the valve seat and the ball, leading to seat wear. Improper operation, such as excessive force or excessively fast operation, will also subject the valve seat to additional impact forces, exacerbating wear.

[0003] Regarding the aforementioned problem of ball valve seat wear and damage, existing technologies have provided solutions. For example, CN118499516A discloses a ball valve with a rotatable seat. This invention uses a series of linkage structures to control the rotation of the valve seat inside the ball valve, rotating the damaged point of the valve seat to avoid the scouring of the medium. However, in actual use, this linkage structure is prone to problems when facing complex pipeline systems and diverse media. In addition, when rotating the valve seat, the ball valve needs to be disassembled from the pipeline system before the valve seat can be rotated, which is a rather cumbersome operation process.

[0004] Therefore, a rotatable ball valve with a valve seat is proposed to address the above problems. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a rotatable ball valve, including a valve body, a valve ball rotatably connected inside the valve body, a valve stem fixedly connected to the valve ball, the valve stem extending upward through the valve body and fixedly connected to a handwheel, symmetrically opening rotating grooves inside the valve body, the axis of the rotating grooves being arranged on the same line as the axis of the valve body end, and the two rotating grooves being symmetrically located on both sides of the valve ball, and a valve seat being provided in each rotating groove; Each valve seat includes a body, and a conical toothed ring is fixedly connected to the end face of each body near the valve body port. A conical toothed ring is engaged with a conical tooth on one side. A rotating shaft is fixedly connected to the upper end face of the conical tooth. The rotating shaft passes through the valve body upward and is fixedly connected to a second handwheel.

[0007] Preferably, each of the conical toothed rings has an extension cylinder on its end face. One end of the extension cylinder is sealed against the end face of the conical toothed ring, and the other end of the extension cylinder extends toward the end of the valve body. The other end face of the extension cylinder has multiple sealing grooves. Each sealing groove engages with a sealing circuit provided inside the valve body. Each sealing groove has a hollow sealing ring. Each sealing ring is connected to an oil injection pipe, which extends upward to the valve body and is connected to an external hydraulic oil pump.

[0008] Preferably, each of the conical toothed rings and one end of the extension cylinder has an intermeshing annular groove, and a rubber ring is laid in the annular groove.

[0009] Preferably, a sprocket is fixedly connected to the outer ring of each of the rotating shafts, and two adjacent sprockets are connected together by a chain, which is sleeved on the outer ring of the valve stem.

[0010] Preferably, the valve body is provided with a support frame for stable rotation of the valve stem, and a sub-frame is provided below the top of the support frame. The sub-frame is provided with an adjustment structure for adjusting the tension of the chain, and the adjustment structure includes support plates symmetrically arranged in the inner ring of the chain. Threaded cylinders are provided on the inner side walls of the two support plates, and a screw is provided between the two opposing threaded cylinders. A support block is rotatably connected to the screw, and the support block is fixed to the sub-frame. Rotating the screw drives the two support plates to move towards each other.

[0011] Preferably, a driven tooth is provided between the two screws, the driven tooth is rotatably connected to the sub-frame, the driven tooth meshes with a driving tooth, and the driving tooth is rotatably connected to the support frame; a rocker arm is fixedly connected to the axis of the driving tooth; a pulley is fixedly connected to the axis of the end face of the driven tooth, and a pulley is fixedly connected to the outer ring of each screw, the pulley on the driven tooth and the pulley on the screw are connected by a belt.

[0012] Preferably, each of the rotating shafts is fixedly connected to a turntable, the turntable is located above the sprocket, and multiple teeth are evenly arranged on the outer ring of the turntable; The outer ring of the sub-frame is symmetrically provided with sleeves, and the end of each sleeve extends toward the turntable. A push rod is provided inside the sleeve, one end of the push rod is provided with a top block adapted to the locking teeth, and the other end of the push rod is connected to the bottom of the sleeve by a spring. The lower surface of the sleeve has a strip-shaped hole, and a traction block is provided in the strip-shaped hole. The traction block is fixed to the lower surface of the top rod, and a traction rope is fixed to the traction block. The traction rope is wound on a winding reel set on the central axis of the screw.

[0013] Preferably, the chain is located inside the vertical part of the support frame.

[0014] Preferably, the ends of each of the support plates are bent inward.

[0015] Preferably, each of the oil injection pipes is laid along the surface of the valve body.

[0016] The advantages of this invention are: 1. In this invention, the rotatable ball valve has several advantages over existing technologies. Firstly, in terms of structure, the valve seat can be rotated by the meshing of conical teeth and conical tooth rings, resulting in a simple structure. It can operate stably in complex media conveying environments. Secondly, in terms of operation, it is not necessary to remove the ball valve from the pipeline system. Simply turn the No. 2 handwheel to close the ball valve. The operation steps are simple, and the impact on the media conveyed in the pipeline system can be reduced, as well as the downtime of the equipment or devices connected to the pipeline system.

[0017] 2. In this invention, the push rod and screw are executed in conjunction. While tensioning the chain, the conical teeth are released simultaneously. Similarly, when the sprocket is relaxed, the screw reverses and releases the pull rope. The push rod pushes the push block into the locking teeth, fixing the conical teeth and stabilizing the valve seat. This serves two purposes: first, to prevent external objects from interfering with the No. 2 handwheel, causing the conical teeth to rotate and disturbing the angle of the valve seat after rotation adjustment; and second, to prevent the valve ball from disturbing the valve seat during rotation, causing the valve seat to deflect and affecting the normal use of the ball valve. Attached Figure Description

[0018] Figure 1 This is a first-view perspective view of the rotatable ball valve of the present invention; Figure 2 This is a second-view perspective perspective view of the rotatable ball valve of the present invention; Figure 3 This is a front view of the rotatable ball valve of the present invention; Figure 4 This is a schematic diagram of the internal structure of the rotatable ball valve in this invention; Figure 5 This is a cross-sectional view of the valve body in this invention; Figure 6 This is a perspective view of the fit between the valve ball and the valve seat in this invention; Figure 7 This is a cross-sectional view of the fit between the conical toothed ring and the valve seat in this invention; Figure 8 This is a cross-sectional view of the fit between the valve ball and the valve seat in this invention; Figure 9 This is a perspective view of the fit between the valve seat and the conical toothed ring in this invention; Figure 10 This is a perspective view of the valve stem and support frame in this invention. Figure 11 This is a perspective view of the support frame in this invention; Figure 12 This is a cross-sectional view of the support frame in this invention; Figure 13 This is a bottom view of the support frame in this invention; Figure 14This is a top view of the support frame in this invention.

[0019] In the diagram: 1. Valve body; 2. Valve ball; 3. Valve stem; 4. Handwheel No. 1; 5. Rotary groove; 6. Valve seat; 7. Body; 8. Conical toothed ring; 9. Conical tooth; 10. Rotary shaft; 11. Handwheel No. 2; 12. Extension cylinder; 13. Sealing groove; 14. Sealing ring; 15. Oil injection pipe; 16. Annular groove; 17. Sprocket; 18. Chain; 19. Support frame; 20. Sub-frame; 21. Support plate; 22. Threaded cylinder; 23. Screw; 24. Support block; 25. Driven tooth; 26. Driving tooth; 27. Handle; 28. Pulley; 29. ​​Belt; 30. Clamping tooth; 31. Sleeve; 32. Push rod; 33. Push block; 34. Traction block; 35. Traction rope; 36. Winding reel; 37. Ring body; 38. Turntable. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] Reference Figures 1-10 A rotatable ball valve includes a valve body 1, a valve ball 2 rotatably connected inside the valve body 1, a valve stem 3 fixedly connected to the valve ball 2, the valve stem 3 extending upward through the valve body 1 and fixedly connected to a handwheel 4, symmetrically opened rotating grooves 5 inside the valve body 1, the axis of the rotating grooves 5 being arranged on the same line as the axis of the end of the valve body 1, and the two rotating grooves 5 being symmetrically located on both sides of the valve ball 2, and a valve seat 6 being provided in each rotating groove 5; Each valve seat 6 includes a body 7. A conical toothed ring 8 is fixedly connected to the end face of each body 7 near the port of the valve body 1. A conical tooth 9 is engaged on one side of each conical toothed ring 8. A rotating shaft 10 is fixedly connected to the upper end face of the conical tooth 9. The rotating shaft 10 extends upward through the valve body 1 and is fixedly connected to a second handwheel 11. In this embodiment, the designed rotatable ball valve uses the above-mentioned solution to solve the problem of wear and damage to the ball valve seat 6. The specific operation is as follows: First, close the ball valve and rotate the first handwheel 4 by 90 degrees. The first handwheel 4 drives the valve ball 2 to rotate through the valve stem 3, closing the ball valve and stopping the flow of the medium. Then, rotate the second handwheel 11. The second handwheel 11 drives the conical tooth 9 to rotate through the rotating shaft 10. Since the conical tooth 9 meshes with the conical tooth ring 8, the conical tooth ring 8 rotates. The specific rotation angle of the conical tooth ring 8 can be controlled by the rotation angle of the second handwheel 11. In this embodiment, it is only necessary to rotate each conical tooth ring 8 by 90 degrees. The conical tooth ring 8 is fixed to the body 7. The body 7 rotates 90 degrees synchronously with the conical tooth ring 8, so that the damaged points on the body 7 are deflected to the position that coincides with the inside of the valve body 1, avoiding the continued scouring of the medium. The area on the body 7 that has not been scouring and damaged by the medium rotates to the position opposite to the direction of medium flow, thereby realizing the rotation of the valve seat 6, so that the ball valve can be used normally. Compared with existing technologies, this rotatable ball valve has several advantages. Firstly, in terms of structure, the valve seat 6 can be rotated by the meshing of the conical teeth 9 and the conical tooth ring 8. The structure is simple and can operate stably in complex media transportation environments. Secondly, in terms of operation, there is no need to remove the ball valve from the pipeline system. To close the ball valve, simply rotate the second handwheel 11. The operation steps are simple and can reduce the impact on the media transported in the pipeline system and reduce the downtime of the equipment or devices connected to the pipeline system. Considering the cost of the ball valve, the body 7 is designed to be fixed to the conical toothed ring 8 by multiple bolts. When there is no intact area on the body 7, the ball valve can be directly removed, the valve seat 6 can be disassembled and removed, and the new body 7 can be replaced on the conical toothed ring 8. Only the body 7 needs to be replaced, and the entire ball valve does not need to be replaced, thus controlling replacement and maintenance costs.

[0022] Reference Figures 1-2 , and 5- Figure 9 Each of the conical toothed rings 8 has an extension cylinder 12 on its end face. One end of the extension cylinder 12 is sealed against the end face of the conical toothed ring 8. The other end of the extension cylinder 12 extends toward the end of the valve body 1. Multiple sealing grooves 13 are opened on the other end face of the extension cylinder 12. Each sealing groove 13 engages with a sealing circuit provided inside the valve body 1. A hollow sealing ring 14 is provided in each sealing groove 13. An oil injection pipe 15 is connected to each sealing ring 14. The oil injection pipe 15 extends upward to the outside of the valve body 1 and is connected to an external hydraulic oil pump. A groove 5 is provided inside the valve body 1 to match the rotation of the valve seat 6 and the conical toothed ring 8, allowing the valve seat 6 to rotate within the valve body 1. To ensure a tight seal between the valve seat 6 and the valve ball 2, the valve seat 6 must be pressed against the surface of the valve ball 2. Therefore, a sealing ring 14 that can expand and compress the valve seat 6 is provided. Before rotating the valve seat 6, the hydraulic oil inside the sealing ring 14 is extracted, causing the sealing ring 14 to contract and not compress the extension cylinder 12. At this time, the compressive force between the valve seat 6 and the ball valve decreases, allowing the valve seat 6 to rotate smoothly. After the valve seat 6 has rotated, hydraulic oil is injected into the sealing ring 14 through the oil injection pipe 15 via a hydraulic oil pump. The sealing ring 14 expands due to the hydraulic oil filling it, compressing the extension cylinder 12. The extension cylinder 12 presses against the conical toothed ring 8, which is fixed to the valve seat 6 by multiple bolts. The compressive force acts directly on the valve seat 6, increasing the compressive force between the valve seat 6 and the valve ball 2, thereby improving the sealing performance between the valve ball 2 and the valve seat 6.

[0023] Reference Figures 5-9 Each of the conical toothed rings 8 and one end of the extension cylinder 12 has an intermeshing annular groove 16, and a rubber ring is laid in the annular groove 16. The extension cylinder 12 is designed to increase the flow path of the medium, that is, to increase the path of the medium to penetrate into the rotating groove 5, reduce the possibility of the medium entering the rotating groove 5, and reduce the contamination or corrosion of the conical toothed ring 8 by the medium. At the same time, interlocking annular grooves 16 are opened on the end face of the conical toothed ring 8 and one end of the extension cylinder 12, and sealing filler, i.e., multiple rubber rings, are laid in each annular groove 16, which can further improve the sealing performance and reduce the contamination or corrosion of the conical toothed ring 8 by the medium.

[0024] Reference Figures 10-14 Each of the rotating shafts 10 has a sprocket 17 fixedly connected to its outer ring, and two adjacent sprockets 17 are connected together by a chain 18, which is sleeved on the outer ring of the valve stem 3. When the medium flows inside the valve body 1, the erosion damage points on the two valve seats 6 tend to be similar. When rotating the valve seats 6, the two valve seats 6 need to be rotated by the same angle. That is, the damaged points on the valve seats 6 need to avoid the erosion of the medium, and the undamaged areas on the two valve seats 6 need to be rotated to a position opposite to the flow of the medium. For this purpose, a linkage structure is set between the two rotating shafts 10. That is, a sprocket 17 is set on the rotating shaft 10, and the two sprockets 17 are connected together by a chain 18. Rotating one of the second handwheels 11 can drive the other second handwheel 11 to rotate synchronously. The two rotating shafts 10 and the two conical teeth 9 rotate synchronously, and can synchronously drive the two valve seats 6 to rotate by the same angle, thereby ensuring that the undamaged areas on the two valve seats 6 are rotated to a position opposite to the flow of the medium, ensuring the normal use of the ball valve.

[0025] Reference Figures 10-14 The valve body 1 is provided with a support frame 19 for the valve stem 3 to rotate stably. A sub-frame 20 is provided below the top of the support frame 19. The sub-frame 20 is provided with an adjustment structure for adjusting the tension of the chain 18. The adjustment structure includes support plates 21 symmetrically arranged in the inner ring of the chain 18. Threaded cylinders 22 are provided on the inner side walls of the two support plates 21. A screw 23 is provided between the two opposing threaded cylinders 22. A support block 24 is rotatably connected to the screw 23. The support block 24 is fixed to the sub-frame 20. Rotating the screw 23 drives the two support plates 21 to move towards each other. An adjustment structure is provided on the chain 18. When the chain 18 is slack, the adjustment structure can be used to tension the chain 18, ensuring that the two rotating shafts 10 can rotate synchronously. The specific operation of the adjustment structure is as follows: When the valve seat 6 is rotated, the rotating screw 23 pushes the support plate 21 outward, and the support plate 21 squeezes the chain 18 outward, thus tensioning the chain 18 to ensure the smoothness and reliability of the transmission, and to ensure that the two sprockets 17 rotate synchronously, ensuring that the two conical toothed rings 8 and the two bodies 7 rotate at the same angle. After the valve seat 6 is rotated and adjusted, the screw 23 is rotated in the opposite direction, and the two support plates 21 move closer to each other. The support plates 21 no longer squeeze the chain 18, so that the chain 18 is in a slack state, reducing the tension stress of the chain 18. When the chain 18 is in a slack state, it will be subjected to continuous tensile stress, which may cause metal fatigue of the chain 18, especially when the chain 18 is not used for a long time. Keeping it slack can reduce this stress, thereby extending the service life of the chain 18.

[0026] Reference Figures 10-14 A driven tooth 25 is provided between the two screws 23. The driven tooth 25 is rotatably connected to the sub-frame 20. The driven tooth 25 meshes with a driving tooth 26, which is rotatably connected to the support frame 19. A rocker handle 27 is fixedly connected to the axis of the driving tooth 26. A pulley 28 is fixedly connected to the axis of the end face of the driven tooth 25. A pulley 28 is fixedly connected to the outer ring of each screw 23. The pulley 28 on the driven tooth 25 and the pulley 28 on the screw 23 are connected by a belt 29. The pulley 28 is a synchronous belt, and the belt 29 is also a synchronous belt. Rotating the crank handle 27 drives the driving tooth 26 to rotate, which in turn drives the driven tooth 25 to rotate. The driven tooth 25, in turn, drives the two screws 23 to rotate synchronously through the two pulleys 28. The synchronous rotation of the two screws 23 can achieve parallel movement of the two support plates 21 and press them against the chain 18, ensuring that the outer surface of the support plates 21 can fully contact the inner surface of the chain 18 in a surface pressing manner, which helps to stabilize the tension of the chain 18 and maintain the stable operation of the chain 18 transmission. It can also drive the two screws 23 to rotate at the same time, reducing the number of operation steps for the screws 23. Furthermore, the torque applied by the crank handle 27 facilitates the rotation of the screws 23.

[0027] Reference Figures 10-14 Each of the rotating shafts 10 is fixedly connected to a turntable 38, which is located above the sprocket 17, and the outer ring of the turntable 38 is evenly provided with multiple teeth 30; The outer ring of the sub-frame 20 is symmetrically provided with sleeves 31. The end of each sleeve 31 extends toward the turntable 38. A push rod 32 is provided inside the sleeve 31. One end of the push rod 32 is provided with a top block 33 that is adapted to the locking teeth 30. The other end of the push rod 32 is connected to the bottom of the sleeve 31 by a spring. The lower surface of the sleeve 31 has a strip-shaped hole, and the strip-shaped hole is provided with a traction block 34. The traction block 34 is fixed to the lower surface of the top rod 32, and a traction rope 35 is fixed to the traction block 34. The traction rope 35 is wound on the winding reel 36 set on the middle axis of the screw 23. Before the valve seat 6 is rotated and adjusted, the push rod 32, under the elastic force of the spring it is connected to, presses the push block 33 between two adjacent teeth 30 on the turntable 38, restraining the rotation of the turntable 38, thereby stabilizing the conical tooth 9 and thus stabilizing the valve seat 6. When the valve seat 6 needs to be rotated and adjusted, the rocker handle 27 is turned, which drives the screw 23 to rotate. The support plate 21 fixes the chain 18 and tightens the chain 18. At the same time, the screw 23 drives the winding reel 36 to rotate. The winding reel 36 winds the traction rope 35, and the traction rope 35 pulls the push rod 32 to move through the traction block 34. The two push rods 32 move closer to each other, and the push block 33 also disengages from the teeth 30. At this time, the conical tooth 9 is in a free state and can be rotated by the second handwheel 11, thereby driving the conical tooth ring 8 and the valve seat 6 to rotate. The push rod 32 and the screw 23 work together to tension the chain 18 and release the conical teeth 9. Similarly, when the sprocket 17 is relaxed, the screw 23 reverses and releases the pull rope. The push rod 32 pushes the push block 33 into the locking teeth 30, fixing the conical teeth 9 and stabilizing the valve seat 6. This serves two purposes: first, to prevent foreign objects from interfering with the second handwheel 11 and causing the conical teeth 9 to rotate, thus disturbing the angle of the valve seat 6 after rotation adjustment; and second, to prevent the valve ball 2 from disturbing the valve seat 6 when it rotates, causing the valve seat 6 to deflect and affecting the normal use of the ball valve.

[0028] Reference Figure 11 The chain 18 is located inside the vertical part of the support frame 19; The designed support frame 19 has a ring 37 at its top, and the outer ring of the valve stem 3 is rotatably connected inside the ring 37. A chain 18 is provided on the inner side of the vertical part of the support frame 19, which can protect the chain 18 from damage caused by impact from foreign objects.

[0029] Reference Figures 13-14 Each of the support plates 21 is bent inward at its end; When the support plate 21 pushes the chain 18 outward, the chain 18 protrudes outward. The shape of the support plate 21 is designed to prevent the chain 18 from abutting against the end edge of the support plate 21, thus affecting the transmission between the chain 18 and the sprocket 17.

[0030] Reference Figure 2 Each of the oil injection pipes 15 is laid along the surface of the valve body 1; the oil injection pipes 15 are arranged along the outer surface of the valve body 1, and multiple oil injection pipes 15 are arranged in an arc shape and close to the surface of the valve body 1, which can reduce the probability of collision between external foreign objects and the oil injection pipes 15, and is a specific measure to protect the oil injection pipes 15.

[0031] In summary, this rotatable ball valve has a first handwheel 4 on the valve body 1 that drives the valve ball 2 to rotate via the valve stem 3, closing the ball valve and pausing the flow of the medium. Then, the second handwheel 11 is rotated, which drives the conical teeth 9 to rotate via the rotating shaft 10. Since the conical teeth 9 mesh with the conical tooth ring 8, the conical tooth ring 8 rotates. The specific rotation angle of the conical tooth ring 8 can be controlled by the rotation angle of the second handwheel 11. In this embodiment, each conical tooth ring 8 only needs to be rotated 90 degrees. The conical tooth ring 8 is fixed to the body 7, and the body 7 rotates 90 degrees synchronously with the conical tooth ring 8. This causes the damaged points on the body 7 to deflect to a position that coincides with the inside of the inner valve body 1, avoiding further scouring by the medium. The areas on the body 7 that are not damaged by the medium rotate to a position opposite to the direction of medium flow, thereby realizing the rotation of the valve seat 6 and enabling the ball valve to be used normally.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotatable ball valve, comprising a valve body, a valve ball rotatably connected inside the valve body, a valve stem fixedly connected to the valve ball, the valve stem extending upward through the valve body and fixedly connected to a handwheel, characterized in that: The valve body has symmetrically opened rotating grooves, the axis of the rotating grooves is set on the same line as the axis of the valve body end, and the two rotating grooves are symmetrically located on both sides of the valve ball. Each rotating groove is provided with a valve seat. Each valve seat includes a body, and a conical toothed ring is fixedly connected to the end face of each body near the valve body port. A conical toothed ring is engaged with a conical tooth on one side. A rotating shaft is fixedly connected to the upper end face of the conical tooth. The rotating shaft passes through the valve body upward and is fixedly connected to a second handwheel.

2. The rotatable ball valve according to claim 1, characterized in that: Each of the conical toothed rings has an extension cylinder on its end face. One end of the extension cylinder is sealed against the end face of the conical toothed ring, and the other end of the extension cylinder extends toward the end of the valve body. Multiple sealing grooves are opened on the other end face of the extension cylinder. Each sealing groove engages with a sealing circuit provided inside the valve body. Each sealing groove has a hollow sealing ring. Each sealing ring is connected to an oil injection pipe, which extends upward to the valve body and is connected to an external hydraulic oil pump.

3. A rotatable ball valve according to claim 2, characterized in that: Each of the conical toothed rings has an intermeshing annular groove on its end face and one end of the extension cylinder, and a rubber ring is laid in the annular groove.

4. A rotatable ball valve according to claim 1, characterized in that: Each of the aforementioned shafts has a sprocket fixed to its outer ring, and two adjacent sprockets are connected together by a chain, which is fitted onto the outer ring of the valve stem.

5. A rotatable ball valve according to claim 4, characterized in that: The valve body is provided with a support frame for stable rotation of the valve stem. A sub-frame is provided below the top of the support frame. The sub-frame is provided with an adjustment structure for adjusting the tension of the chain. The adjustment structure includes support plates symmetrically arranged on the inner ring of the chain. Threaded cylinders are provided on the inner side walls of the two support plates. A screw is provided between the two opposing threaded cylinders. A support block is rotatably connected to the screw. The support block is fixed to the sub-frame. Rotating the screw drives the two support plates to move towards each other.

6. A rotatable ball valve according to claim 5, characterized in that: A driven tooth is provided between the two screws. The driven tooth is rotatably connected to the sub-frame. The driven tooth meshes with the driving tooth, which is rotatably connected to the support frame. A pulley is fixedly connected to the axial position of the end face of the driven tooth. A pulley is fixedly connected to the outer ring of each screw. The pulley on the driven tooth is connected to the pulley on the screw via a belt.

7. A rotatable ball valve according to claim 6, characterized in that: Each of the aforementioned rotating shafts is fixedly connected to a turntable, which is located above the sprocket, and the outer ring of the turntable is evenly provided with multiple locking teeth; The outer ring of the sub-frame is symmetrically provided with sleeves, and the end of each sleeve extends toward the turntable. A push rod is provided inside the sleeve, one end of the push rod is provided with a top block adapted to the locking teeth, and the other end of the push rod is connected to the bottom of the sleeve by a spring. The lower surface of the sleeve has a strip-shaped hole, and a traction block is provided in the strip-shaped hole. The traction block is fixed to the lower surface of the top rod, and a traction rope is fixed to the traction block. The traction rope is wound on a winding reel set on the central axis of the screw.

8. A rotatable ball valve according to claim 6, characterized in that: The chain is located inside the vertical part of the support frame.

9. A rotatable ball valve according to claim 5, characterized in that: The ends of each of the support plates are bent inwards.

10. A rotatable ball valve according to claim 2, characterized in that: Each of the oil injection pipes is laid along the surface of the valve body.

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