Valve seat rotatable ball valve

Abstract

The application relates to the field of valves, in particular to a valve seat rotatable ball valve which comprises a valve body, a rotation groove is symmetrically arranged in the valve body, two rotation grooves are symmetrically arranged at the two sides of a valve ball, and a valve seat is arranged in each rotation groove; each valve seat comprises a body, a conical tooth ring is fixedly connected to the end face of each body close to the port of the valve body, a conical tooth is engaged on one side of each conical tooth ring, a rotation shaft is fixedly connected to the upper end face of the conical tooth, the rotation shaft penetrates the valve body outward, and a second hand wheel is fixedly connected to the rotation shaft; compared with the prior art, firstly, in the structure, the rotation of the valve seat can be realized by the engagement of the conical tooth and the conical tooth ring, the structure is simple, the valve seat can be stably executed in the face of a complex medium conveying environment, then in the operation mode, the ball valve does not need to be disassembled and taken down from the pipeline system, the ball valve is closed, and the second hand wheel can be rotated, the operation steps are simple, the influence on the medium conveyed by the pipeline system can be reduced, and the suspension time of the equipment or device connected with the pipeline system can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of valves, in particular to a valve seat rotatable ball valve. BACKGROUND

[0002] As a kind of valve, ball valve is widely used in petroleum, chemical industry, metallurgy and other industries due to its rapid and simple opening and closing, strong flexibility. In the use of ball valve, the wear and damage of ball valve seat is a common problem, which has many reasons, such as medium factors: the solid particles in the medium, such as silt, impurities, etc., will cause abrasive wear to the valve seat during the opening and closing of the ball valve, in addition, if the medium is corrosive, it will also cause chemical corrosion to the valve seat and accelerate its damage; Operation factors: frequent opening and closing operation will cause continuous friction between the valve seat and the ball, resulting in valve seat wear, improper operation, such as excessive force, too fast operation, etc., will also cause additional impact force to the valve seat and aggravate the wear.

[0003] For the above-mentioned wear and damage of ball valve seat, the prior art has a solution, such as a valve seat rotatable ball valve with publication number CN118499516A, which controls the rotation of the valve seat inside the ball valve through a series of linkage structures, and rotates the damaged point of the valve seat to avoid the erosion of the medium, however, such linkage structure, in actual use, is prone to problems in the face of complex pipeline system and diversity of medium, and at the same time, when rotating the valve seat, the ball valve needs to be disassembled from the pipeline system, and then the rotation of the valve seat can be carried out, which is relatively cumbersome.

[0004] Therefore, a valve seat rotatable ball valve is proposed for the above-mentioned problems. SUMMARY

[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background art.

[0006] The technical scheme adopted by the present application to solve its technical problems is: a valve seat 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 penetrating upwardly through the valve body and fixedly connected with a first hand wheel, a rotation groove is symmetrically provided in the valve body, the rotation groove axis is coaxial with the valve body end axis, and two rotation grooves are symmetrically located on both sides of the valve ball, and a valve seat is arranged in each rotation groove.

[0007] Each valve seat comprises a body, a tapered tooth ring is fixedly connected to the end face of each body near the valve body port, a tapered tooth is engaged on one side of each tapered tooth ring, a rotation shaft is fixedly connected to the upper end face of the tapered tooth, the rotation shaft penetrates upwardly through the valve body outside and is fixedly connected with a second hand wheel.

[0008] Preferably, the end face of each of the conical tooth rings is provided with an extension cylinder, one end of the extension cylinder is sealed on the end face of the conical tooth ring, the other end of the extension cylinder extends to the end of the valve body, and a plurality of sealing grooves are formed on the other end face of the extension cylinder, each sealing groove engages a sealing circuit arranged inside the valve body, a hollow sealing ring is arranged in each sealing groove, an oil injection pipe is communicated with each sealing ring, the oil injection pipe extends upward to the outside of the valve body and is communicated with an external hydraulic oil pump.

[0009] Preferably, the end face of each of the conical tooth rings and one end of the extension cylinder are provided with annular grooves that engage with each other, and a rubber ring is arranged in the annular groove.

[0010] Preferably, a sprocket is fixedly connected to the outer ring of each of the rotating shafts, two adjacent sprockets are connected together by a chain, and the chain is sleeved on the outer ring of the valve rod.

[0011] Preferably, a support frame is arranged on the valve body for stably rotating the valve rod, a sub-frame is arranged below the top of the support frame, an adjusting structure for adjusting the tension of the chain is arranged on the sub-frame, and the adjusting structure comprises support plates symmetrically arranged on the inner ring of the chain, threaded cylinders are arranged on the inner side walls of the two support plates, a screw rod is arranged between the two threaded cylinders, a support block is rotatably connected to the screw rod, the support block is fixedly connected to the sub-frame, and rotating the screw rod drives the two support plates to move towards each other.

[0012] Preferably, a driven tooth is arranged between the two screw rods, the driven tooth is rotatably connected to the sub-frame, the driven tooth engages a driving tooth, and the driving tooth is rotatably connected to the support frame; a crank handle is fixedly connected to the axis position of the driving tooth; a belt pulley is fixedly connected to the end face axis position of the driven tooth, and a belt pulley is fixedly connected to the outer ring of each screw rod; the belt pulley on the driven tooth and the belt pulley on the screw rod are connected by a belt.

[0013] Preferably, a rotating disc is fixedly connected to the axis of each rotating shaft, the rotating disc is located above the sprocket, and a plurality of clamping teeth are uniformly arranged on the outer ring of the rotating disc.

[0014] A sleeve is symmetrically arranged on the outer ring of the sub-frame, the end of each sleeve extends in the direction of the rotating disc, a jack is arranged in the sleeve, one end of the jack is provided with a top block matched with the clamping teeth, and the other end of the jack is connected to the bottom of the sleeve by a spring;

[0015] A strip-shaped hole is formed on the lower surface of the sleeve, the strip-shaped hole is provided with a traction block, the traction block is fixedly connected to the lower surface of the jack, and a traction rope is fixedly connected to the traction block, the traction rope is wound on a winding disc arranged on the middle axis of the screw rod.

[0016] Preferably, the chain is located inside the vertical part of the support frame.

[0017] Preferably, the end of each support plate is bent inward.

[0018] Preferably, each oil injection pipe is arranged along the surface of the valve body.

[0019] The present application has the advantages of:

[0020] 1. In the present application, the valve seat rotatable ball valve, compared with the prior art, first in structure, relying on the meshing of the conical teeth and the conical teeth ring, the rotation of the valve seat can be realized, the structure is simple, in the face of complex medium conveying environment, can stably execute, then in the operation mode, without disassembling the ball valve from the pipeline system, closing the ball valve, rotating the second hand wheel, the operation steps are simple, and the influence on the pipeline system conveying medium can be reduced, and the suspension time of the equipment or device connected by the pipeline system can be reduced.

[0021] 2. In the present application, the top rod and the screw rod are linked to execute, the chain is tensioned at the same time, and the conical teeth are released at the same time, and the screw rod is reversed when the chain wheel is relaxed, the pull rope is released, the top rod pushes the top block to embed into the clamping tooth, the conical teeth are fixed, and the valve seat is stabilized, which can avoid the interference between foreign matters and the second hand wheel, drive the conical teeth to rotate, disturb the angle of the valve seat after rotation adjustment, and prevent the rotation of the valve ball from disturbing the valve seat, so that the valve seat is deflected and the normal use of the ball valve is affected. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a first perspective view of the valve seat rotatable ball valve in the present application;

[0023] Figure 2 It is a second perspective view of the valve seat rotatable ball valve in the present application;

[0024] Figure 3 It is a front view of the valve seat rotatable ball valve in the present application;

[0025] Figure 4 It is a schematic view of the internal structure of the valve seat rotatable ball valve in the present application;

[0026] Figure 5 It is a sectional view of the valve body in the present application;

[0027] Figure 6 It is a cooperation perspective view of the valve ball and the valve seat in the present application;

[0028] Figure 7 It is a cooperation sectional view of the conical tooth ring and the valve seat in the present application;

[0029] Figure 8 It is a cooperation sectional view of the valve ball and the valve seat in the present application;

[0030] Figure 9 It is a cooperation perspective view of the valve seat and the conical tooth ring in the present application;

[0031] Figure 10The cooperation perspective view of the valve rod and the support frame in the application;

[0032] Figure 11 The perspective view of the support frame in the application;

[0033] Figure 12 The sectional view of the support frame in the application;

[0034] Figure 13 The bottom view of the support frame in the application;

[0035] Figure 14 The top view of the support frame in the application.

[0036] In the figure: 1, valve body; 2, valve ball; 3, valve rod; 4, No. 1 hand wheel; 5, rotating groove; 6, valve seat; 7, body; 8, conical tooth ring; 9, conical tooth; 10, rotating shaft; 11, No. 2 hand wheel; 12, extension cylinder; 13, sealing groove; 14, sealing ring; 15, oil injection pipe; 16, annular groove; 17, chain wheel; 18, chain; 19, support frame; 20, sub-frame; 21, support plate; 22, threaded cylinder; 23, screw rod; 24, support block; 25, driven tooth; 26, driving tooth; 27, rocking handle; 28, pulley; 29, belt; 30, clamping tooth; 31, sleeve; 32, jacking rod; 33, jacking block; 34, traction block; 35, traction rope; 36, winding reel; 37, ring body; 38, rotating disc. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, purposes and effects realized by the application easy to understand, the application is further described below in combination with specific embodiments.

[0038] Reference Figures 1-10 A valve seat rotatable ball valve, comprising a valve body 1, a valve ball 2 is rotatably connected inside the valve body 1, a valve rod 3 is fixedly connected to the valve ball 2, the valve rod 3 penetrates the valve body 1 upwards and is fixedly connected with a No. 1 hand wheel 4, rotating grooves 5 are symmetrically formed in the valve body 1, the axis of the rotating grooves 5 is coaxial with the axis of the valve body 1, and two rotating grooves 5 are symmetrically located on both sides of the valve ball 2, and each rotating groove 5 is provided with a valve seat 6;

[0039] Each valve seat 6 comprises a body 7, a conical tooth ring 8 is fixedly connected to the end face of each body 7 close to the port of the valve body 1, a conical tooth 9 is engaged on one side of each conical tooth ring 8, a rotating shaft 10 is fixedly connected to the upper end face of the conical tooth 9, the rotating shaft 10 penetrates the valve body 1 outwardly and is fixedly connected with a No. 2 hand wheel 11;

[0040] In this embodiment, the valve seat rotatable ball valve is designed to solve the problem of ball valve seat 6 wear and damage by using the above scheme. The specific operation is as follows: first, close the ball valve, rotate the first hand wheel 4 by 90 degrees, the first hand wheel 4 drives the valve ball 2 to rotate through the valve stem 3, closes the ball valve, and pauses the medium flow, then rotates the second hand wheel 11, the second hand wheel 11 drives the conical teeth 9 to rotate through the shaft 10, because the conical teeth 9 engages the conical teeth ring 8, the conical teeth ring 8 rotates, and the specific rotation angle of the conical teeth ring 8 can be controlled by the rotation angle of the second hand wheel 11. In this embodiment, each conical teeth ring 8 needs to be rotated by 90 degrees, and the conical teeth ring 8 is fixed to the body 7. The body 7 rotates synchronously with the conical teeth ring 8 by 90 degrees, so that the damaged point on the body 7 is deflected to the position coinciding with the inside of the valve body 1, avoiding the continuous erosion of the medium, and the area of the body 7 not eroded by the medium is rotated to the position opposite to the direction of the medium flow, thereby realizing the rotation of the valve seat 6, so that the ball valve can be used normally;

[0041] Compared with the prior art, the valve seat rotatable ball valve first relies on the engagement of the conical teeth 9 and the conical teeth ring 8 to realize the rotation of the valve seat 6, which is simple in structure and stable in execution in complex medium conveying environment. Then, in the operation mode, the ball valve does not need to be disassembled from the pipeline system, but only needs to be closed and rotated by the second hand wheel 11, which is simple in operation steps and can reduce the influence on the pipeline system conveying medium and the suspension time of the equipment or device connected to the pipeline system.

[0042] Considering the cost of the ball valve, the body 7 is fixed to the conical teeth ring 8 by multiple bolts. When there is no intact area on the body 7, the ball valve is directly removed, the valve seat 6 is disassembled and removed, and a new body 7 is replaced on the conical teeth ring 8. Only the body 7 needs to be replaced, without replacing the entire ball valve, thereby controlling the replacement and maintenance cost.

[0043] Referring to Figures 1-2 , and Figures 5-9 , the end face of each conical teeth ring 8 is provided with an extension cylinder 12, one end of the extension cylinder 12 is sealed on the end face of the conical teeth ring 8, the other end of the extension cylinder 12 extends to the end of the valve body 1, and a plurality of sealing grooves 13 are formed on the other end face of the extension cylinder 12. Each sealing groove 13 engages a sealing circuit arranged inside the valve body 1, and each sealing groove 13 is provided with a hollow sealing ring 14, and each sealing ring 14 is communicated with an oil injection pipe 15 extending upward to the outside of the valve body 1 and connected with an external hydraulic oil pump;

[0044] The valve body 1 is provided with a rotating groove 5 matched with the rotation of the valve seat 6 and the conical tooth ring 8, so that the valve seat 6 can rotate in the valve body 1, and the valve seat 6 needs to be sealed with the valve ball 2. The valve seat 6 needs to be extruded on the surface of the valve ball 2. For this purpose, a sealing ring 14 that can expand and extrude the valve seat 6 is arranged. The hydraulic oil in the sealing ring 14 is removed before the valve seat 6 is rotated, so that the sealing ring 14 shrinks and does not extrude the extension cylinder 12. At this time, the extrusion force between the valve seat 6 and the ball valve is reduced, and the valve seat 6 can be smoothly rotated. When the valve seat 6 is rotated, the hydraulic oil is injected into the sealing ring 14 through the hydraulic oil pump along the oil injection pipe 15. At this time, the sealing ring 14 is inflated by filling hydraulic oil and extrudes the extension cylinder 12. The extension cylinder 12 is pressed on the conical tooth ring 8, and the conical tooth ring 8 is fixed with the valve seat 6 by a plurality of bolts. At this time, the extrusion force directly acts on the valve seat 6, increases the extrusion force between the valve seat 6 and the valve ball 2, and improves the sealing between the valve ball 2 and the valve seat 6.

[0045] Referring to Figures 5-9 The end face of each conical tooth ring 8 and one end of the extension cylinder 12 are provided with annular grooves 16 that mesh with each other, and rubber rings are arranged in the annular grooves 16;

[0046] The extension cylinder 12 is designed to increase the medium flow stroke, that is, to increase the path of medium permeation into the rotating groove 5, to reduce the possibility of medium entering the rotating groove 5, and to reduce the pollution or corrosion of the medium to the conical tooth ring 8. At the same time, the end face of the conical tooth ring 8 and one end of the extension cylinder 12 are provided with annular grooves 16 that mesh with each other, and sealing fillers, that is, a plurality of rubber rings, are arranged in each annular groove 16, which can further improve the sealing and reduce the pollution or corrosion of the medium to the conical tooth ring 8.

[0047] Referring to Figures 10-14 Each of the outer rings of the rotating shafts 10 is fixedly connected with a sprocket 17, and the adjacent two sprockets 17 are connected together by a chain 18, and the chain 18 is sleeved on the outer ring of the valve stem 3;

[0048] When the medium flows in the valve body 1, the two valve seats 6 are subjected to the same erosion damage. When the valve seat 6 is rotated, the two valve seats 6 need to be rotated by the same angle, that is, the damage points of the valve seat 6 need to avoid the erosion of the medium, and the undamaged areas of the two valve seats 6 are rotated to the position opposite to the medium flow. For this purpose, a linkage structure is arranged between the two rotating shafts 10, that is, a sprocket 17 is arranged on the rotating shaft 10, and the two sprockets 17 are connected together by a chain 18. When one of the two handle wheels 11 is rotated, the other handle wheel 11 can be driven to rotate synchronously. The two rotating shafts 10 and the two conical teeth 9 rotate synchronously, and can drive the two valve seats 6 to rotate by the same angle, so that the undamaged areas of the two valve seats 6 are rotated to the position opposite to the medium flow, and the normal use of the ball valve is ensured.

[0049] With reference to Figures 10-14 The valve body 1 is provided with a support frame 19 for stable rotation of the valve rod 3, and a sub-frame 20 is arranged below the top of the support frame 19. An adjusting structure for adjusting the tension of the chain 18 is arranged on the sub-frame 20. The adjusting structure comprises two support plates 21 symmetrically arranged on the inner ring of the chain 18. Threaded barrels 22 are arranged on the inner side walls of the two support plates 21. A screw rod 23 is arranged between the two threaded barrels 22. A support block 24 is rotatably connected to the screw rod 23. The support block 24 is fixedly connected to the sub-frame 20. Rotating the screw rod 23 drives the two support plates 21 to move towards each other.

[0050] The adjusting structure is arranged on the chain 18. When the chain 18 is relaxed, the adjusting structure tightens the chain 18 to ensure that the two rotating shafts 10 can rotate synchronously. The specific operation of the adjusting structure is as follows. When the valve seat 6 is rotated, the screw rod 23 is rotated, the outer push plate 21 of the screw rod 23 is pushed, and the push plate 21 extrudes the chain 18 outward. The chain 18 is tightened to ensure the stability and reliability of the transmission and the synchronous rotation of the two sprockets 17, which ensures that the two conical gear rings 8 and the two bodies 7 rotate the same angle. After the rotation of the valve seat 6 is adjusted, the screw rod 23 is rotated in the opposite direction, the two support plates 21 move towards each other, and the support plates 21 no longer extrude the chain 18, so that the chain 18 is in a relaxed state, reducing the tension stress of the chain 18. The chain 18 will be subjected to continuous tensile stress in the tightened state. This stress may cause metal fatigue of the chain 18. Especially in the case of long-term non-use of the chain 18, keeping it relaxed can reduce this stress, thereby prolonging the service life of the chain 18.

[0051] With reference to Figures 10-14 A driven tooth 25 is arranged between the two screw rods 23. The driven tooth 25 is rotatably connected to the sub-frame 20. The driven tooth 25 is engaged with a driving tooth 26. The driving tooth 26 is rotatably connected to the support frame 19. The axis position of the driving tooth 26 is fixedly connected to a crank 27. The end surface axis position of the driven tooth 25 is fixedly connected to a belt pulley 28. The belt pulley 28 is fixedly connected to the outer ring of each screw rod 23. The belt pulley 28 on the driven tooth 25 and the belt pulley 28 on the screw rod 23 are connected through a belt 29.

[0052] The designed pulley 28 is a synchronous belt, and the designed belt 29 is a synchronous belt; rotating the handle 27 drives the driving tooth 26 to rotate, the driving tooth 26 drives the driven tooth 25 to rotate, and the driven tooth 25 drives the two screw rods 23 to rotate synchronously through the two pulleys 28, so that the two supporting plates 21 can move in parallel and press on the chain 18, the outer surface of the supporting plate 21 can be in full surface pressing contact with the inner surface of the chain 18, the tensioning state of the chain 18 is stabilized, the stable operation of the chain 18 is maintained, the two screw rods 23 can be driven to rotate simultaneously, the operation of the screw rod 23 is reduced, and the rotation of the screw rod 23 is facilitated through the handle 27.

[0053] Referring to Figures 10-14 Each of the rotating shafts 10 is fixedly connected with a rotating disc 38, the rotating disc 38 is located above the sprocket 17, and a plurality of clamping teeth 30 are uniformly arranged on the outer circle of the rotating disc 38;

[0054] The outer circle of the auxiliary frame 20 is symmetrically provided with a sleeve 31, the end of each sleeve 31 extends to the rotating disc 38, a jack 32 is arranged in the sleeve 31, one end of the jack 32 is provided with a top block 33 matched with the clamping tooth 30, and the other end of the jack 32 is connected to the bottom of the sleeve 31 through a spring;

[0055] A strip-shaped hole is formed in the lower surface of the sleeve 31, the strip-shaped hole is provided with a traction block 34, the traction block 34 is fixedly connected to the lower surface of the jack 32, a traction rope 35 is fixedly connected to the traction block 34, and the traction rope 35 is wound on a winding disc 36 arranged on the middle axis of the screw rod 23;

[0056] Before the valve seat 6 is rotated and adjusted, the jacks 32 are pressed to the adjacent two clamping teeth 30 on the rotating disc 38 under the elastic force of the connected springs, the self-rotation of the rotating disc 38 is constrained, the conical tooth 9 is stabilized, and the valve seat 6 is also stabilized; when the valve seat 6 needs to be rotated and adjusted, the handle 27 is rotated to drive the screw rod 23 to rotate, the supporting plate 21 is fixed to the chain 18, the chain 18 is tightened, the winding disc 36 is driven to rotate by the screw rod 23, the winding disc 36 winds the traction rope 35, the traction rope 35 moves the jacks 32 through the traction block 34, the two jacks 32 are close to each other, and the top block 33 is also separated from the clamping tooth 30, at this time, the conical tooth 9 is in a free state, the second hand wheel 11 can be used to rotate the conical tooth 9, so as to drive the conical tooth ring 8 and the valve seat 6 to rotate;

[0057] The top rod 32 is linked with the screw rod 23 to perform, while the chain 18 is tensioned, the conical teeth 9 are released at the same time, and vice versa. The screw rod 23 is reversed, the pull rope is released, the top rod 32 pushes the top block 33 to embed into the clamping tooth 30, the conical teeth 9 are fixed, the valve seat 6 is stabilized, the interference between the foreign matter and the second hand wheel 11 is avoided, the conical teeth 9 are driven to rotate, the angle of the valve seat 6 after rotation adjustment is disturbed, the rotation of the valve ball 2 is avoided, the valve seat 6 is avoided to be deflected, the normal use of the ball valve is affected.

[0058] With reference to Figure 11 The chain 18 is located inside the vertical part of the support frame 19.

[0059] The support frame 19 is designed, the top of the support frame 19 is provided with a ring body 37, the outer ring of the valve rod 3 is rotationally connected in the ring body 37, the chain 18 is arranged inside the vertical part of the support frame 19, and the chain 18 can be protected from damage caused by the impact of foreign matters.

[0060] With reference to Figures 13-14 The end of each support plate 21 is inwardly bent.

[0061] When the support plate 21 supports the chain 18, the chain 18 is outwardly protruding, and the shape of the support plate 21 is arranged to avoid the chain 18 from being in contact with the edge of the end of the support plate 21, and to affect the transmission between the chain 18 and the chain wheel 17.

[0062] With reference to Figure 2 Each oil injection pipe 15 is arranged along the surface of the valve body 1. The oil injection pipe 15 is arranged along the outer surface of the valve body 1, a plurality of oil injection pipes 15 are arranged in an arc shape, and are close to the surface of the valve body 1, so as to reduce the probability of collision of foreign matters on the oil injection pipe 15, and to be a protective measure for the oil injection pipe 15.

[0063] As described above, the valve seat rotatable ball valve, the first hand wheel 4 arranged on the valve body 1 drives the valve ball 2 to rotate through the valve rod 3, the ball valve is closed, the medium flow is paused, then the second hand wheel 11 is rotated, the second hand wheel 11 drives the conical teeth 9 to rotate through the rotating shaft 10, the conical teeth 9 meshes with the conical teeth ring 8, the conical teeth ring 8 rotates, and the specific rotation angle of the conical teeth ring 8 can be controlled by the rotation angle of the second hand wheel 11. In this embodiment, each conical teeth ring 8 needs to be rotated by 90 degrees, the conical teeth ring 8 is fixedly connected with the body 7, the body 7 rotates synchronously with the conical teeth ring 8 by 90 degrees, so that the deflection point of the body 7 is deflected to a position coinciding with the inside of the inner valve body 1, avoiding the continuous erosion of the medium, and the area of the body 7 not eroded by the medium is rotated to a position opposite to the direction of the medium flow, so as to realize the rotation of the valve seat 6, so that the ball valve can be normally used.

[0064] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application 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 is provided with two rotation grooves which are symmetrically arranged in the valve body, the axis of the rotation grooves is in line with the axis of the end of the valve body, and the two rotation grooves are symmetrically arranged on both sides of the valve ball. Each valve seat comprises a body, a conical tooth ring is fixedly connected to the end face of each body near the port of the valve body, one side of each conical tooth ring is engaged with a conical tooth, the upper end face of the conical tooth is fixedly connected with a rotation shaft, the rotation shaft penetrates the valve body outward, and a second hand wheel is fixedly connected to the rotation shaft. A sprocket is fixedly connected to the outer circle of each rotation shaft, two adjacent sprockets are connected by a chain, and the chain is sleeved on the outer circle of the valve rod. The valve body is provided with a support frame for stable rotation of the valve rod, a sub-frame is arranged below the top of the support frame, an adjusting structure for adjusting the tension of the chain is arranged on the sub-frame, the adjusting structure comprises two support plates which are symmetrically arranged on the inner circle of the chain, threaded cylinders are arranged on the inner side walls of the two support plates, a screw rod is arranged between the two threaded cylinders, a support block is rotatably connected to the screw rod, and the support block is fixedly connected to the sub-frame. Two screw rods are arranged between the two screw rods, a driven tooth is rotatably connected to the sub-frame, the driven tooth is engaged with a driving tooth, and the driving tooth is rotatably connected to the support frame. A belt pulley is fixedly connected to the end face of the driven tooth, a belt pulley is fixedly connected to the outer circle of each screw rod, and the belt pulleys on the driven tooth and the screw rod are connected by a belt. A rotating disc is fixedly connected to the axis of each rotation shaft, the rotating disc is located above the sprocket, and multiple clamping teeth are uniformly arranged on the outer circle of the rotating disc. A sleeve is symmetrically arranged on the outer circle of the sub-frame, the end of each sleeve extends in the direction of the rotating disc, a jack is arranged in the sleeve, a top block adapted to the clamping teeth is arranged at one end of the jack, and the other end of the jack is connected to the bottom of the sleeve by a spring.

2. A valve seat rotatable ball valve according to claim 1, characterized in that: A strip-shaped hole is arranged on the lower surface of the sleeve, a traction block is fixedly connected to the lower surface of the jack, a traction rope is fixedly connected to the traction block, and the traction rope is wound on a winding disc arranged on the middle axis of the screw rod.

3. A valve seat rotatable ball valve according to claim 2, characterised in that: An extension cylinder is arranged on the end face of each conical tooth ring, one end of the extension cylinder is sealingly arranged on the end face of the conical tooth ring, the other end of the extension cylinder extends in the direction of the end of the valve body, multiple sealing grooves are arranged on the other end face of the extension cylinder, each sealing groove is engaged with a sealing loop arranged in the valve body, each sealing loop is connected with an oil injection pipe, the oil injection pipe extends upwardly to the outside of the valve body and is connected with an external hydraulic oil pump.

4. A valve seat rotatable ball valve according to claim 1, characterized in that: An annular groove is arranged on the end face of each conical tooth ring and one end of the extension cylinder, and a rubber ring is arranged in the annular groove.

5. A valve seat rotatable ball valve according to claim 1, characterized in that: The chain is located in the inner side of the vertical part of the support frame.

6. A valve seat rotatable ball valve according to claim 2, characterized in that: The end of each support plate is bent inwardly. Each oil injection pipe is arranged along the surface of the valve body.

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