A large-caliber, high-pressure, low-torque ball valve

Abstract

The present invention discloses a large-caliber, high-pressure, low-torque ball valve, comprising a graphite ring, a valve seat, a sphere, a valve body, a lower bearing, a stuffing box, a receiving disc, a valve stem, a turbine head, a turbine, a turbine cover and a locking device, wherein the inner ring of the graphite ring is fixed with a fixed seat, a spring is fixed on the left side of the valve seat, self-lubricating layers are fixed on the top and bottom of the sphere, slideways are arranged around the inside of the valve body, the top of the lower bearing penetrates through the bottom of the valve body and is fixedly connected with the shaft seat at the bottom of the sphere, the stuffing box is installed on the top of the valve body, the receiving disc penetrates through the stuffing box through a fixing nut, the bottom of the valve stem penetrates through the receiving disc and the stuffing box and extends into the inside of the valve body, a connecting groove is arranged on the left side of the turbine head, and the large-caliber, high-pressure, low-torque ball valve is provided with a filter screen, through which impurities in water entering the valve body are filtered, so as to avoid impurities in the water being left between the valve body and the sphere, causing scratches on the sphere and the impurities, thereby affecting the accuracy of the entire surface of the sphere.

Description

Technical Field

[0001] The invention relates to the technical field of ball valves, in particular to a large-caliber, high-pressure, low-torque ball valve. Background Art

[0002] The ball valve is a new type of valve that came out in the 1950s. In just over 30 years, the ball valve has developed into a major valve type. It has been widely used in many fields such as aerospace, petrochemical, long-distance pipelines, light industry and food, and construction. The United States began to design ball valves as early as the 1880s, but the lack of appropriate sealing materials at that time limited the development of the method and prevented it from becoming a formal industrial product. It was not until the 1950s that the emergence of elastic sealing materials such as polytetrafluoroethylene led to a turning point in the production and development of ball valves. At the same time, due to the development of the machine tool industry, the ball processing technology has been improved, and the dimensional accuracy and surface roughness required by the ball can be achieved. Due to the different uses of the ball valve, impurities are left between the valve body and the ball during the use of the ball valve, causing the ball to rub against the impurities during the rotation process, thereby affecting the ball accuracy and causing the connection gap between the valve body and the ball to be too large, resulting in the ball being unable to perform a sealing function. Summary of the invention

[0003] The purpose of the present invention is to provide a large-caliber, high-pressure, low-torque ball valve in view of the shortcomings of the prior art, so as to solve the problem proposed in the above background technology that impurities are left between the valve body and the ball, causing the ball to rub against the impurities during rotation, thereby affecting the accuracy of the ball, resulting in the connection gap between the valve body and the ball being too large, resulting in the ball being unable to perform a sealing function.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a large-caliber, high-pressure, low-torque ball valve, comprising a graphite ring, a valve seat, a ball, a valve body, a lower bearing, a stuffing box, a receiving plate, a valve stem, a turbine head, a turbine, a turbine cover and a locking device, wherein the inner ring of the graphite ring is fixed with a fixed seat, a spring is fixed on the left side of the valve seat, and a valve seat ring is fixed on the inner ring of the valve seat, the valve seat is fixed to the inner ring of the fixed seat, self-lubricating layers are fixed on the top and bottom of the ball, a shaft seat is fixed on the top of the self-lubricating layer, a slideway is provided around the inside of the valve body, a drain screw is movably installed on the top of the slideway, a grease injection valve is installed above the drain screw, the ball is movably installed inside the valve body, the top of the lower bearing passes through the bottom of the valve body and is fixedly connected to the shaft seat at the bottom of the ball, and the bottom of the lower bearing is fixedly connected to the ear shaft, and the ear shaft is fixed to the bottom of the valve body through a spring gasket and a fixing nut, the stuffing box is installed on the top of the valve body, the receiving plate passes through the stuffing box through the fixing nut, and the receiving plate is fixed At the top of the stuffing box, the bottom of the valve stem passes through the receiving disc and the stuffing box and extends into the valve body, and the bottom of the valve stem is fixedly connected to the shaft seat at the top of the ball, the graphite ring is installed in the valve body, and the graphite ring is rotatably connected to the ball, the top of the side valve body is fixed with ears on both sides through fixing nuts, the bottom of the side valve body is fixed with support seats on both sides through fixing nuts and support seat sealing rings, the side valve body is fixed to both sides of the valve body through fixing nuts, gaskets and filter screens, a connecting groove is provided on the left side of the turbine head, and the turbine head passes through the top of the valve stem and is fixed to the top of the receiving disc, a first slot is provided on the left side of the worm, and the left side of the worm passes through the right side of the turbine head and extends into the turbine head, and at the same time, the left side of the worm is fixedly connected to the left side of the turbine head, the turbine passes through the top of the valve stem, and the turbine is fixedly connected to the top of the valve stem, and at the same time, the turbine is meshed with the worm, a hand wheel is fixed on the right side of the worm, a second slot is provided on the turbine cover, and the turbine cover is fixed to the top of the turbine head through a fixing nut;

[0005] A locking device for locking the worm is installed on the left side inside the turbine head.

[0006] Preferably, the locking device includes a concave block, a groove, a compression spring, a connecting plate, a clamping rod, a mounting block, a connecting hole, a limiting rod, a connecting groove, a clamping column, a clamping hole and a pull rod, the concave block is provided with grooves on both sides, the left side of the compression spring is fixedly connected to the left side of the groove, the right side of the connecting plate is fixed with a clamping rod, and the left side of the connecting plate is fixedly connected to the right side of the compression spring, the mounting block is provided with a connecting hole, the limiting rod is provided with a connecting groove at the bottom, the clamping column is provided with a clamping hole at the bottom, the concave block is fixed to the left side of the turbine head, the mounting block is fixed to the left side of the turbine head, the pull rod passes through the connecting groove and the concave block and is fixedly connected to the left side of the connecting plate, the limiting rod passes through the connecting hole and the pull rod, and the limiting rod is movably connected to the pull rod, and the clamping column passes through the second clamping slot and is connected to the clamping rod through the clamping hole.

[0007] Preferably, six slideways are provided, and the slideways are evenly distributed around the interior of the valve body.

[0008] Preferably, there are two lifting ears, and the lifting ears are symmetrically arranged about the center line of the side valve body.

[0009] Preferably, the filter screen and the valve body are connected in a concentric circle shape.

[0010] Preferably, the distance between the connecting gap between the clamping column and the second clamping slot and the first clamping slot is 1.5-3 cm.

[0011] Preferably, there are two clamping holes, and the clamping holes are symmetrically arranged about the center line of the clamping column.

[0012] Preferably, the pull rod, the connecting plate and the clamping rod constitute a moving mechanism, and the moving distance range of the moving mechanism is 0-5 cm.

[0013] Preferably, the pull rod is in a "U" shape.

[0014] Compared with the prior art, the invention has the following beneficial effects: the large-caliber, high-pressure, low-torque ball valve

[0015] (1) A valve seat ring is provided, and the valve seat ring is made of Deweilong material, which ensures corrosion resistance and high hardness to achieve wear resistance, and also ensures a certain degree of elasticity. The matching tolerance and sealing ratio of the valve seat ring and the support seat have reached the optimal state through analysis and calculation;

[0016] (2) A self-lubricating layer is provided, and the material of the self-lubricating layer is 304 stainless steel + PTFE. The self-lubricating layer reduces the contact friction between the valve stem and the trunnion and the ball, thereby reducing its torque;

[0017] (3) The support seat and the support seal ring are designed with elasticity. This design makes the sealing surface between the ball and the valve seat fit tightly and elastically, so that the valve can adapt to high-pressure sealing (≤10000PSI) and can also achieve sealing under low-pressure conditions (≥50PSI);

[0018] (4) The number and torque of the springs are calculated and adjusted. The torque makes the valve seat and the ball reach the most suitable pressure ratio. Grease is injected into the middle cavity of the valve body and the surface roughness of the ball is improved. These measures greatly reduce the torque when the valve is opened and closed under pressure.

[0019] (5) A filter screen is provided to filter impurities entering the valve body, thereby preventing the impurities from adhering to the space between the valve body and the ball, causing the ball to rub against the impurities during rotation, thereby affecting the overall accuracy of the ball;

[0020] (6) A locking device is provided to lock and fix the worm gear to prevent the hand wheel from rotating arbitrarily to drive the ball to rotate, thereby arbitrarily changing the rotation direction of the ball and causing the overall flow rate to change. In addition, other locking devices are connected through the connecting groove at the bottom of the limit rod to prevent the limit rod from being separated from the mounting block, causing the limit rod to fail to play a limiting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the front cross-sectional structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the valve body and filter structure of the present invention;

[0023] Figure 3 It is a left-side structural schematic diagram of the valve seat and spring of the present invention;

[0024] Figure 4 It is a schematic diagram of the gasket structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the left side structure of the turbine head of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the locking device of the present invention.

[0027] In the figure: 1, graphite ring, 2, fixed seat, 3, valve seat, 4, spring, 5, valve seat ring, 6, ball, 7, self-lubricating layer, 8, shaft seat, 9, valve body, 10, slide, 11, emptying screw, 12, grease injection valve, 13, lower bearing, 14, ear shaft, 15, spring gasket, 16, fixing nut, 17, stuffing box, 18, receiving plate, 19, valve stem, 20, side valve body, 21, lifting ear, 22, support seat sealing ring, 23, support seat, 24, gasket, 25, filter screen, 26. turbine head, 27. connecting groove, 28. worm, 29. first slot, 30. turbine, 31. hand wheel, 32. turbine cover, 33. second slot, 34. locking device, 3401. concave block, 3402. groove, 3403. compression spring, 3404. connecting plate, 3405. clamping rod, 3406. mounting block, 3407. connecting hole, 3408. limiting rod, 3409. connecting groove, 3410. clamping column, 3411. clamping hole, 3412. pull rod. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-6 The present invention provides a technical solution: a large-caliber high-pressure low-torque ball valve, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a fixed seat 2 is fixed to the inner ring of the graphite ring 1, a spring 4 is fixed to the left side of the valve seat 3, and a valve seat ring 5 is fixed to the inner ring of the valve seat 3. The valve seat 3 is fixed to the inner ring of the fixed seat 2. Self-lubricating layers 7 are fixed to the top and bottom of the sphere 6, and a shaft seat 8 is fixed to the top of the self-lubricating layer 7. Slideways 10 are opened around the inside of the valve body 9. There are 6 slideways 10, and the slideways 10 are evenly distributed around the inside of the valve body 9. Grease is injected into the valve body 9 through the slideways 10 to increase the smoothness of the surface of the sphere 6 and reduce the torque when the valve body 9 is opened and closed under pressure. At the same time, it is convenient to discharge the grease that has been used for a long time inside the valve body 9 from the inside of the valve body 9 through the slideways 10 to prevent the grease from forming a viscous state inside the valve body 9 for a long time, which increases the torque when the valve body 9 is opened and closed under pressure. In addition, the slideways 10 are distributed on the valve body. 9 is surrounded by the inside, so that it is convenient to discharge the grease from the inside of the valve body 9 at different angles, so as to avoid discharging at the same position. It is not only simple and convenient but also reduces the time for grease to be discharged from the inside of the valve body 9. A drain screw 11 is movably installed on the top of the slide 10, and a grease injection valve 12 is installed above the drain screw 11. The ball 6 is movably installed inside the valve body 9. The top of the lower bearing 13 passes through the bottom of the valve body 9 and is fixedly connected to the shaft seat 8 at the bottom of the ball 6, and the bottom of the lower bearing 13 is fixedly connected to the ear shaft 14. At the same time, the ear shaft 14 is fixed to the bottom of the valve body 9 through the spring gasket 15 and the fixing nut 16. The stuffing box 17 is installed at the top of the valve body 9, and the receiving plate 18 passes through the stuffing box 17 through the fixing nut 16, and the receiving plate 18 is fixed to the top of the valve body 9. The bottom of the valve stem 19 passes through the receiving plate 18 and the stuffing The box 17 extends inside the valve body 9, and the bottom of the valve stem 19 is fixedly connected to the shaft seat 8 at the top of the ball 6. The graphite ring 1 is installed inside the valve body 9, and the graphite ring 1 is rotatably connected to the ball 6. The top of the side valve body 20 is fixed with lifting ears 21 on both sides through the fixing nuts 16. There are two lifting ears 21, and the lifting ears 21 are symmetrically arranged about the center line of the side valve body 20. The lifting ears 21 are convenient for fixing the integral ball valve at a certain height from the ground, and the lifting ears 21 are convenient for fixing the integral ball valve at different positions. At the same time, two lifting ears 21 are arranged to maintain the center of gravity balance of the integral ball valve after installation, to prevent the integral ball valve from tilting or falling due to the unstable center of gravity after installation, which is easy to cause the integral ball valve to be damaged, and then the center of gravity of the integral ball valve is vertically adjusted through the lifting ears 21. The bottom of the side valve body 20 is kept stable as a whole. Support seats 23 are fixed on both sides of the bottom of the side valve body 20 by fixing nuts 16 and support seat sealing rings 22. The side valve body 20 is fixed to both sides of the valve body 9 by fixing nuts 16, gaskets 24 and filter screen 25. The connection shape of filter screen 25 and valve body 9 is concentric circle, which is convenient for the installation of filter screen 25. If the shape of filter screen 25 is other shapes, it is easy to cause a connection gap between filter screen 25 and valve body 9, which is easy to cause impurities to enter the inside of the valve body 9 through the gap, and the impurities are left in the inside of the valve body 9 and contact and rub against the ball 6, thereby affecting the overall accuracy of the ball 6, and at the same time causing a connection gap between the ball 6 and the valve body 9. When the ball 6 is closed, it cannot form a seal with the valve body 9, resulting in poor sealing of the overall ball valve.A connection groove 27 is provided on the left side of the turbine head 26, and the turbine head 26 passes through the top of the valve stem 19 and is fixed to the top of the receiving plate 18. A first slot 29 is provided on the left side of the worm 28, and the left side of the worm 28 passes through the right side of the turbine head 26 and extends inside the turbine head 26. At the same time, the left side of the worm 28 is fixedly connected to the left side inside the turbine head 26. The turbine 30 passes through the top of the valve stem 19, and the turbine 30 is fixedly connected to the top of the valve stem 19. At the same time, the turbine 30 is meshedly connected to the worm 28. A hand wheel 31 is fixed on the right side of the worm 28. A second slot 33 is provided on the turbine cover 32, and the turbine cover 32 is fixed to the top of the turbine head 26 through the fixing nut 16.

[0030] like Figure 6As shown, the locking device 34 for locking the worm 28 is installed on the left side inside the turbine head 26, and the locking device 34 includes a concave block 3401, a groove 3402, a compression spring 3403, a connecting plate 3404, a clamping rod 3405, a mounting block 3406, a connecting hole 3407, a limiting rod 3408, a connecting groove 3409, a clamping column 3410, a clamping hole 3411 and a pull rod 3412. The concave block 3401 is provided with grooves 3402 on both sides, the left side of the compression spring 3403 is fixedly connected to the left side inside the groove 3402, the clamping rod 3405 is fixedly connected to the right side of the connecting plate 3404, and the left side of the connecting plate 3404 is fixedly connected to the right side of the compression spring 3403, the mounting block 3406 is provided with a connecting hole 3407, the limiting rod 3408 ... A connecting groove 3409 is provided through the bottom, and a clamping hole 3411 is provided at the bottom of the clamping column 3410. There are two clamping holes 3411, and the clamping holes 3411 are symmetrically arranged about the center line of the clamping column 3410. The clamping hole 3411 is engaged with the clamping rod 3405 to make the clamping column 3410 and the recessed block 3401 in a vertical state. At the same time, there are two clamping holes 3411, which are arranged according to the number of the clamping rods 3405 to prevent the clamping rods 3405 from being unable to accurately engage with the clamping holes 3411 due to too many or too few clamping holes 3411. The recessed block 3401 is fixed to the left side of the turbine head 27, and the mounting block 3406 is fixed to the left side of the turbine head 27. The pull rod 3412 passes through the connecting groove 3409 and the recessed block 3401 and the connecting plate 340 4 is fixedly connected on the left side, and the pull rod 3412 is in a "U" shape, which is convenient for the right side of the pull rod 3412 to be fixedly connected with the left side of the connecting plate 3404, and at the same time ensures that the overall pulling force is uniform during the movement of the connecting plate 3404 driven by the pull rod 3412, and prevents the connecting plate 3404 from being tilted due to uneven pulling force during the movement of the connecting plate 3404 driven by the pull rod 3412, which easily causes the connecting plate 3404 to be separated from the pull rod 3412, so that the clamping column 3410 cannot be separated from the clamping rod 3405, and the rotation angle of the ball 6 cannot be adjusted to change the overall flow rate. The pull rod 3412, the connecting plate 3404 and the clamping rod 3405 constitute a moving mechanism, and the moving distance range of the moving mechanism is 0-5cm. 12 drives the clamping rod 3405 to move to the left, so that the clamping rod 3405 is separated from the clamping hole 3411 on the left side of the clamping column 3410, which facilitates the clamping column 3410 to loosen inside the recessed block 3401, and the maximum moving distance of the overall moving mechanism is 5 cm. If the maximum moving distance is exceeded, the left side of the connecting plate 3404 will be squeezed and contacted with the right side of the recessed block 3401, and the pull rod 3412 will be easily separated from the connecting plate 3404, and the clamping column 3410 engaged in the recessed block 3401 cannot be loosened. It is also necessary to disassemble the turbine cover 32 and the turbine head 26 before the clamping column 3410 can be loosened. The limiting rod 3408 passes through the connecting hole 3407 and the pull rod 3412, and the limiting rod 3408 is movably connected to the pull rod 3412.The clamping column 3410 passes through the second clamping slot 34 and is clamped and connected with the clamping rod 3405 through the clamping hole 3411. The connection gap between the clamping column 3410 and the second clamping slot 33 and the first clamping slot 29 is 1.5-3cm. If the connection gap between the clamping column 3410 and the second clamping slot 33 and the first clamping slot 29 is too small, the clamping column 3410 and the second clamping slot 33 and the first clamping slot 29 cannot move, thereby causing the clamping hole 3411 on the right side of the clamping column 3410 to be unable to separate from the clamping rod 3405 on the right side. , it is impossible to change the rotation angle of the ball 6 and thus change the size of the overall flow rate. Therefore, to avoid such a situation, the connection gap between the clamping column 3410 and the second clamping slot 33 and the first clamping slot 29 is set to 2 cm. This not only facilitates the through connection between the clamping column 3410 and the second clamping slot 33 and the first clamping slot 29, but also ensures that there is a movable gap between the clamping column 3410 and the second clamping slot 33 and the first clamping slot 29 to facilitate the separation of the clamping hole 3411 on the right side of the clamping column 3410 and the clamping rod 3405 on the right side.

[0031] Working principle: When using a large-diameter, high-pressure, low-torque ball valve, first manually hold the limit rod 3408 and then apply a certain pulling force upwards. At this time, the limit rod 3408 moves relative to the mounting block 3406. When the limit rod 3408 is separated from the mounting block 3406, then manually hold the pull rod 3412 and apply a pulling force to the left to the pull rod 3412. At this time, the pull rod 3412 drives the connecting plate 3404 to move to the left, and the connecting plate 3404 drives the clamping rod 3405 to move in the same direction. During the movement of the connecting plate 3404 to the left, the compression spring 3403 is squeezed and the clamping rod 3405 is separated from the clamping hole 3411. Then manually hold the clamping column 3410 and apply a pulling force to the left to the clamping column 3410. At this time, the clamping column 3410 and the concave block 3401 The inner wall moves to the left, and at the same time, the card hole 3411 on the right side of the card column 3410 is separated from the right side card rod 3405, and then an upward pulling force is applied to the card column 3410. At this time, the card column 3410 moves upward through the second card slot 33. When the card column 3410 is separated from the second card slot 33, the pull rod 3412 is manually released. At this time, the compression spring 3403 is not subjected to force and elastically recovers, and the compression spring 3403 drives the connecting plate 3404 and the card rod 3405 to move to the right, and then the handwheel 31 is manually held, and then a certain rotational force is applied to the handwheel 31, the handwheel 31 drives the worm 28 to move, the worm 28 drives the turbine 30 to move, the turbine 30 drives the valve stem 19 to move, the valve stem 19 drives the shaft seat 8 to move, and the shaft seat 8 drives the self-lubricating layer 7 and the ball 6 moves in the same direction, and the ball 6 drives the lower bearing 13 to move, and the lower bearing 13 drives the inner ring of the ear shaft 14 to move. When the hand wheel 31 cannot rotate the worm 28, the ball 6 rotates to the maximum angle. When there is no need to adjust the rotation angle of the ball 6 again, manually hold the clamping column 3410 to apply an upward pulling force, and the clamping column 3410 drives the clamping hole 3411 to move in the same direction. When the clamping column 3410 moves to the top of the second clamping groove 33, a certain downward thrust is applied to the clamping column 3410. At this time, the clamping column 3410 drives the clamping hole 3411 to move downward. At the same time, the clamping column 3410 passes through the first clamping groove 29 and the second clamping groove 33 and contacts the clamping rod 3405. Then a downward thrust is applied to the clamping column 3410. At this time, the clamping column 3410 squeezes the clamping rod 3405, and the clamping The rod 3405 drives the connecting plate 3404 to move to the left, and the connecting plate 3404 drives the pull rod 3412 to move in the same direction, and the compression spring 3403 is squeezed during the movement of the connecting plate 3404 to the left. When the clamping rod 3405 is in engagement with the clamping hole 3411, the downward thrust to the clamping column 3410 is stopped. At this time, the compression spring 3403 is not subjected to the force and elastically recovers, and the compression spring 3403 drives the connecting plate 3404 to move to the right and contact both sides of the clamping column 3410. At the same time, the limit rod 3408 is manually held to apply an upward pulling force to the limit rod 3408. At this time, the limit rod 3408 drives the connecting slot 3409 to move upward. When the limit rod 3408 moves to the top of the connecting hole 3407, a downward thrust is applied to the limit rod 3408.At this time, the limit rod 3408 drives the connecting groove 3409 to move downward and penetrate the connecting hole 3407. When the limit rod 3408 contacts the mounting block 3406, the limit rod 3408 is stopped from being pushed, and the limit rod 3408 is locked by penetrating the connecting groove 3409 with other tools. At the same time, other fluids enter the valve body 9 through the side valve body 20 on the right side of the valve body 9. When the fluid passes through the filter screen 25, the filter screen 25 filters the impurities contained in the fluid, and the filtered fluid enters the valve body 9 through the filter screen 25, and passes through the filter screen 25. The grease in the valve body 9 flows to other positions through the ball 6 inside the valve body 9 to the side valve body 20 on the left side of the valve body 9. After the grease in the valve body 9 has been used for a period of time, the drain screw 11 is rotated by an auxiliary tool to separate the drain screw 11 from the slideway 10, and then the grease in the valve body 9 is discharged from the valve body 9. When the grease is completely discharged, the grease is then discharged and fixed to the slideway 10, and new grease is injected into the valve body 9 through the grease injection valve 12. This completes the entire operation, and the contents not described in detail in this manual belong to the prior art known to professional and technical personnel in this field.

[0032] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the protection content of the present invention.

[0033] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A large-caliber, high-pressure, low-torque ball valve, comprising a graphite ring (1), a valve seat (3), a ball (6), a valve body (9), a lower bearing (13), a stuffing box (17), a receiving plate (18), a valve stem (19), a turbine head (26), a turbine (30), a turbine cover (32) and a locking device (34), characterized in that: A graphite ring (1), wherein a fixed seat (2) is fixed to the inner ring of the graphite ring (1), a spring (4) is fixed to the left side of the valve seat (3), and a valve seat ring (5) is fixed to the inner ring of the valve seat (3), the valve seat (3) is fixed to the inner ring of the fixed seat (2), the top and bottom of the sphere (6) are fixed with a self-lubricating layer (7), the top of the self-lubricating layer (7) is fixed with a shaft seat (8), a slideway (10) is provided around the inside of the valve body (9), a drain screw (11) is movably installed at the top of the slideway (10), a grease injection valve (12) is installed above the drain screw (11), the sphere (6) is movably installed inside the valve body (9), and the bottom The top end of the bearing (13) passes through the bottom of the valve body (9) and is fixedly connected to the shaft seat (8) at the bottom of the ball (6), and the bottom of the lower bearing (13) is fixedly connected to the ear shaft (14), and the ear shaft (14) is fixed to the bottom of the valve body (9) through a spring washer (15) and a fixing nut (16). The stuffing box (17) is installed on the top end of the valve body (9), the connecting plate (18) passes through the stuffing box (17) through the fixing nut (16), and the connecting plate (18) is fixed to the top end of the stuffing box (17), the bottom end of the valve stem (19) passes through the connecting plate (18) and the stuffing box (17) and extends into the valve body (9), and the bottom end of the valve stem (19) is connected to the top end of the ball (6). The shaft seat (8) is fixedly connected, the graphite ring (1) is installed inside the valve body (9), and the graphite ring (1) is rotatably connected to the ball (6), the top two sides of the side valve body (20) are fixed with lifting ears (21) through fixing nuts (16), the bottom two sides of the side valve body (20) are fixed with support seats (23) through fixing nuts (16) and support seat sealing rings (22), the side valve body (20) is fixed to the two sides of the valve body (9) through fixing nuts (16), gaskets (24) and filter screens (25), the left side of the turbine head (26) is provided with a connecting groove (27), and the turbine head (26) passes through the top of the valve stem (19) and is fixed to the receiving plate (18) The top end of the valve stem (19) is provided with a first slot (29) on the left side of the worm (28), and the left side of the worm (28) passes through the right side of the turbine head (26) and extends into the inside of the turbine head (26), and the left side of the worm (28) is fixedly connected to the left side of the inside of the turbine head (26), the turbine (30) passes through the top end of the valve stem (19), and the turbine (30) is fixedly connected to the top end of the valve stem (19), and the turbine (30) is meshingly connected to the worm (28), a hand wheel (31) is fixed on the right side of the worm (28), a second slot (33) is provided on the turbine cover (32), and the turbine cover (32) is fixed to the top end of the turbine head (26) by a fixing nut (16); A locking device (34) for locking the worm (28) is installed on the left side inside the turbine head (26).

2. A large-caliber, high-pressure, low-torque ball valve according to claim 1, characterized in that: The locking device (34) includes a concave block (3401), a groove (3402), a compression spring (3403), a connecting plate (3404), a clamping rod (3405), a mounting block (3406), a connecting hole (3407), a limiting rod (3408), a connecting groove (3409), a clamping column (3410), a clamping hole (3411) and a pull rod (3412). The concave block (3401) has grooves (3402) on both sides thereof. The left side of the compression spring (3403) is fixedly connected to the left side of the groove (3402). The right side of the connecting plate (3404) is fixedly connected to the clamping rod (3405). The left side of the connecting plate (3404) is fixedly connected to the right side of the compression spring (3403). The mounting block (3406) has a connecting hole (3407) extending therethrough. The connecting hole (3407) is formed on the bottom of the limiting rod (3408), a connecting groove (3409) is formed on the bottom of the clamping column (3410), a clamping hole (3411) is formed on the bottom of the clamping column (3410), the recessed block (3401) is fixed to the left side of the turbine head (27), the mounting block (3406) is fixed to the left side of the turbine head (27), the pull rod (3412) passes through the connecting groove (3409) and the recessed block (3401) and is fixedly connected to the left side of the connecting plate (3404), the limiting rod (3408) passes through the connecting hole (3407) and the pull rod (3412), and the limiting rod (3408) is movably connected to the pull rod (3412), and the clamping column (3410) passes through the second clamping groove (34) and is clamped and connected to the clamping rod (3405) through the clamping hole (3411).

3. According to claim 1, a large-caliber, high-pressure, low-torque ball valve is characterized by: Six slideways (10) are provided, and the slideways (10) are evenly distributed around the inside of the valve body (9).

4. A large-caliber, high-pressure, low-torque ball valve according to claim 1, characterized in that: Two lifting ears (21) are provided, and the lifting ears (21) are symmetrically arranged with respect to the center line of the side valve body (20).

5. A large-caliber, high-pressure, low-torque ball valve according to claim 1, characterized in that: The filter screen (25) and the valve body (9) are connected in a concentric circle shape.

6. A large-caliber, high-pressure, low-torque ball valve according to claim 2, characterized in that: The distance between the connecting gap between the clamping column (3410) and the second clamping slot (33) and the first clamping slot (29) is 1.5-3 cm.

7. A large-caliber, high-pressure, low-torque ball valve according to claim 2, characterized in that: There are two clamping holes (3411), and the clamping holes (3411) are symmetrically arranged about the center line of the clamping column (3410).

8. A large-caliber, high-pressure, low-torque ball valve according to claim 2, characterized in that: The pull rod (3412), the connecting plate (3404) and the clamping rod (3405) constitute a moving mechanism, and the moving distance range of the moving mechanism is 0-5 cm.

9. A large-caliber, high-pressure, low-torque ball valve according to claim 2, characterized in that: The pull rod (3412) is in a "U" shape.

Images