Wedge-shaped sealing self-centering adjusting top-mounted ball valve

Abstract

The utility model relates to a wedge-shaped sealing self-centering adjusting top-mounted ball valve. An existing ball valve is complex in structure, large in weight, high in operation cost and long in repair and maintenance period, and parking is caused by frequent jamming faults. The ball valve comprises a valve body, a ball body, valve seats, valve seat sealing gaskets, valve seat frames, a valve rod and a valve cover, and is characterized in that inclined planes for mounting the valve seats are arranged on flow channels on the left side and the right side of the valve body, and the two valve seat frames provided with the valve seats and the valve seat sealing gaskets are attached to the upper spherical surface and the lower spherical surface of the ball body in a holding mode and placed into a middle cavity of the valve body through a middle flange opening of the valve body. The face, provided with the sealing gasket, of the valve seat frame is arranged on the inclined face, and a disc spring buffering structure is further arranged at the connecting position of the valve rod and the ball body. The utility model can solve the problems of high cost, easiness in locking, long maintenance period and the like in the application of conveying and discharging powder particle media at present.

Description

Technical Field

[0001] This utility model patent relates to the technical field of top-entry sealed ball valves, and in particular to a wedge-shaped sealed self-centering adjustable top-entry ball valve, which is used in industrial production systems such as powder discharge systems (PDS), polyethylene (PE), polypropylene (PP), and coal powder. Background Art

[0002] Top-entry sealing ball valves are widely used in industrial systems such as petroleum, chemical industry, long-distance pipelines, oil production, energy, etc. In pipeline systems, they are mainly responsible for diversion, cutoff, throttling and other functions. In various powder conveying and discharge systems, a large number of metal hard-sealed fixed ball valves are used. These ball valves have complex structures and heavy weights, and often get stuck and cause shutdowns, with high operating costs and long repair and maintenance cycles. Utility Model Content

[0003] In view of the above problems, the utility model provides a wedge-shaped sealed self-centering regulating top-mounted ball valve to solve the problems of high cost, easy jamming, long repair and maintenance period in the current powder particle medium conveying and discharging application.

[0004] To this end, the utility model adopts the following technical scheme: a wedge-sealed self-centering adjustable top-mounted ball valve, comprising a valve body, a ball, a valve seat, a valve seat sealing gasket, a valve seat frame, a valve stem and a valve cover, characterized in that the flow channels on the left and right sides of the valve body are provided with inclined surfaces for valve seat installation, two valve seat frames equipped with valve seats and valve seat sealing gaskets are embraced and fit with the upper and lower spherical surfaces of the ball, and are inserted into the middle cavity of the valve body through the middle flange opening of the valve body, one side of the valve seat frame equipped with a sealing gasket is placed on the inclined surface, and a disc spring buffer structure is also provided at the connection between the valve stem and the ball.

[0005] A middle flange is provided at the opening of the middle cavity of the valve body, and all parts installed inside the valve body are installed from the middle flange. When the valve is installed in the pipeline system, if the valve needs to be repaired, it is not necessary to take the whole valve offline. You only need to remove the valve cover at the middle flange end of the valve, and then you can disassemble the internal parts for repair or replacement. The valve seat frame is equipped with a sealing gasket on one side and placed on the symmetrical inclined surface of the valve body. The wedge-type configuration with double inclined surfaces on both sides is helpful for valve sealing.

[0006] After the valve has been running for a period of time, the valve seat and the ball are evenly worn due to the powder medium, resulting in a gap between the sealing surfaces and causing internal leakage in the valve. The double-beveled wedge-shaped configuration causes the valve seat and the ball to slide slightly down the bevel under their own weight. The sliding process allows the valve seat to fit the sealing surface of the ball again, and the spherical sealing surface is automatically centered.

[0007] Preferably, an adjustment mechanism capable of adjusting the upper and lower positions of the ball is further provided at the bottom of the valve body. After the valve has been in operation for a long time, the valve seat and the ball fall to a sealing position by self-centering under the action of gravity, and the adjustment mechanism provides a supporting force to ensure the smooth movement of the ball. During inspection and maintenance, the ball is pushed upward by the adjustment mechanism, and the ball and the valve seat are easier to disassemble from the valve body.

[0008] Preferably, the upper and lower ends of the sphere form a plane, and a spring seat and a disc spring are installed in sequence between the lower end of the valve stem and the upper plane of the sphere, and a flat groove is provided on the upper plane for mating with the flat tenon at the lower end of the valve stem. When the valve is actuated, the disc spring buffer structure can buffer the impact caused by the rotation of the sphere, provide a certain degree of protection for the sealing surface, and prevent the kinetic energy impact from causing scratches on the sealing surface; in addition, the pre-tightening of the disc spring provides a downward thrust to the sphere and the valve seat frame, so that the valve seat frame always fits tightly against the inclined surface of the valve body, ensuring the seal between the valve seat frame and the valve body.

[0009] Preferably, the inclined surface is symmetrical with the center of the valve body cavity as the center, and annular grooves are provided on both end faces of the valve seat frame, with the deeper annular groove on one side being used to install the elastic valve seat; and the shallower annular groove on the other side being used to install the valve seat gasket. The outer circle and inner hole of the two parts are interference fit; after the two valve seat frames equipped with valve seats and valve seat gaskets are hugged and fitted with the spherical surface of the sphere, they are placed into the valve body cavity through the flange opening in the valve body.

[0010] Preferably, the adjustment mechanism includes a protective cover, an adjusting screw, a sealing cover, a packing gasket, an adjusting support and a support sealing gasket. The spherical arc end of the adjusting screw passes through the entire support through the tail of the adjusting support and extends from the bottom of the valve body to the bottom of the sphere. A group of lower packings is installed between the stuffing box of the adjusting support and the adjusting screw, and the lower packing seal is tightened by the sealing cover.

[0011] Preferably, the outer circle of the adjustment support is provided with two external threads of different lengths, a stuffing box hole is provided on one side of the long thread end, and a conical sealing chamfer is provided at the bottom of the step hole provided on the short thread end. The short thread of the adjustment support is screwed into the threaded hole provided at the bottom of the valve body, and a support sealing gasket is provided at the connection between the adjustment support and the valve body to ensure that the valve body has no leakage.

[0012] Preferably, the threaded section of the adjusting screw is matched with the inner thread of the sealing gland, and the inner thread of the protective cover is matched with the long thread of the adjusting support. The extension length of the adjusting screw in the valve body is adjusted, and the screwing depth is adjusted according to the exposed length of the adjusting screw after adjustment, which effectively prevents dust particles from the external environment from entering the sealing position of the adjusting mechanism and ensures the tight sealing of the adjusting mechanism.

[0013] As a preferred embodiment, it also includes a bracket mounted on the upper end surface of the valve cover, a pneumatic actuator is mounted on the upper end of the bracket, the pneumatic actuator and the bracket are fixedly connected by bolts, a square countersunk hole is provided in the bottom of the actuator, and the outer square body at the end of the valve stem is matched. The actuator drives the valve stem to rotate under the drive of a certain pressure of signal gas supplied by the gas source, and the valve stem drives the ball to rotate to realize the opening and closing action of the valve.

[0014] Preferably, the valve stem passes through the stuffing box hole in the center of the valve cover, and a stuffing pad, stuffing, stuffing gland and stuffing plate are installed from bottom to top between the stuffing box hole of the valve cover and the valve stem to form a stuffing system. The full-thread stud and nut are tightened to ensure the sealing of the stuffing box and the valve stem.

[0015] Preferably, the outer circle of the lower end boss of the valve cover matches with the inner hole of the flange in the valve body, a winding gasket is provided at the matching position between the valve cover and the valve body, and an O-ring is provided on the outer circle of the valve cover boss. The double sealing of the O-ring and the winding gasket ensures the sealing between the valve cover and the valve body, eliminating the possibility of leakage accidents.

[0016] The beneficial effects of the utility model are as follows:

[0017] 1. The two valve seats are installed in a wedge shape on the two symmetrical slopes of the valve body, surrounding the ball. After the valve seat and the ball are worn, they will self-center and re-fit under their own weight to ensure that the valve sealing performance is long-lasting and reliable.

[0018] 2. A disc spring buffer structure is provided at the connection between the valve stem and the ball, which provides effective buffer protection for the ball during movement, while increasing the fitting force of the valve seat ball and enhancing the sealing performance of the valve.

[0019] 3. The adjusting mechanism at the bottom of the valve body, after the valve has been in operation for a long time, the valve seat and the ball fall to the sealing position by self-centering under the action of their own gravity. The adjusting mechanism provides a supporting force to ensure the smooth and stable movement of the ball. When the valve needs maintenance, the ball is pushed upward through the adjusting mechanism, and the ball and the valve seat are easier to remove from the valve body.

[0020] 4. The valve body center opening flange faces upwards and the internal parts are assembled from top to facilitate online maintenance and reduce maintenance and repair costs.

[0021] 5. The structure of the one-piece valve body is different from the two-piece and three-piece combined valve body. There is no assembly connection point, which ensures that there are fewer connection points where leakage may occur, and the overall structure is safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model.

[0023] Figure 2 yes Figure 1 Enlarged schematic diagram of part I in the middle.

[0024] In the figure: 1, valve body 2, ball 3, valve seat 4, valve seat frame 5, valve seat sealing gasket 6, spring seat 7, disc spring 8, valve stem 9, valve cover 10, packing pad 11, packing 12, packing gland 13, packing pressure plate 14, bracket 15, pneumatic actuator 100, adjusting mechanism 101, protective cover 102, adjusting screw 103, sealing gland 104, packing gasket 105, lower packing 106, adjusting support 107, support sealing gasket. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with specific embodiments.

[0026] like Figure 1 A wedge-sealed self-centering adjustable top-mounted ball valve shown in the figure comprises a valve body 1, a ball 2, a valve seat 3, a valve seat frame 4, a valve seat sealing gasket 5, a spring seat 6, a disc spring 7, a valve stem 8, a valve cover 9, a packing gasket 10, a packing 11, a packing gland 12, a packing pressure plate 13, a bracket 14, a pneumatic actuator 15 and an adjusting mechanism 100 and other components.

[0027] In one embodiment, the valve body 1 is an integrally formed structure, which is different from a two-piece or three-piece ball valve body, so that the valve body 1 itself does not have a matching seal, which can reduce the connection points where leakage occurs.

[0028] Specifically, a middle flange is provided at the opening of the middle cavity of the valve body 1, and the parts installed inside the valve body 1 are all installed from the middle flange opening. When the valve is installed in a pipeline system, if the valve needs to be repaired, there is no need to take the entire valve offline. Only the valve cover at the middle flange end of the valve needs to be removed, and the internal parts can be disassembled for repair or replacement.

[0029] The left and right flow channels of the valve body 1 are provided with inclined surfaces for installing the valve seat 3, and the inclined surfaces are symmetrical with the center of the middle cavity as the center. Both end surfaces of the valve seat frame 4 are provided with annular grooves. The deeper annular groove on one side is used to install the elastic valve seat 3, and the outer circle and inner hole of the two parts are interference fit; the shallower annular groove on the other side is used to install the valve seat sealing gasket 5. After the two valve seat frames 4 equipped with the valve seats 3 and the valve seat sealing gaskets 5 are hugged and fitted with the spherical surface of the sphere 2, the valve body 1 is put into the middle cavity of the valve body through the flange opening in the valve body 1. The valve seat frame 4 with the sealing gasket is placed on the symmetrical inclined surface inside the valve body 1. This wedge-like configuration with double inclined surfaces on both sides is conducive to valve sealing.

[0030] After the valve has been running for a period of time, the uniform wear of the valve seat 3 and the ball 2 caused by the powder medium causes a gap between the sealing surfaces of the two, resulting in internal leakage of the valve. The wedge-like configuration of the double slopes causes the valve seat 3 and the ball 2 to slide slightly down along the slope under the action of their own weight. The sliding process is the re-fitting of the sealing surfaces of the valve seat 3 and the ball 2, and due to the spherical sealing surface, automatic centering can be achieved.

[0031] In one embodiment, the sphere 2 is provided with an upper and a lower plane, and a flat groove is provided on the upper plane for mating with the flat tenon at the lower end of the valve stem 8. A spring seat 6 and a disc spring 7 are sequentially installed between the lower end of the valve stem 8 and the upper plane of the sphere 2. When the valve is actuated, the disc spring 7 buffers the impact of the movement of the sphere 2, provides buffer protection for the sealing surface, and prevents the sealing surface from being scratched. In addition, the pre-tightening of the disc spring 7 provides a pre-tightening force downward to the sphere 2 and the valve seat frame 4, so that the valve seat frame 4 always fits tightly on the inclined surface of the valve body 1, ensuring the seal between the valve seat frame 4 and the valve body 1.

[0032] In one embodiment, the outer circle of the boss at the lower end of the valve cover 9 is assembled with the inner hole of the flange in the valve body 1. A winding gasket and an O-ring are provided at the joint between the valve cover 9 and the valve body 1. The redundant design of double sealing ensures the sealing between the valve cover 9 and the valve body 1, eliminating the possibility of leakage accidents.

[0033] In one embodiment, the valve stem 8 passes through the stuffing box hole in the center of the valve cover 9. A stuffing pad 10, a stuffing 11, a stuffing gland 12, and a stuffing plate 13 are installed from bottom to top between the stuffing box hole of the valve cover 9 and the valve stem 8 to form a stuffing system, which is tightened by full-thread studs and nuts to ensure the sealing of the stuffing box and the valve stem 8.

[0034] In one embodiment, the bracket 14 is installed on the end surface of the valve cover 9 and is fixedly connected by bolts. A pneumatic actuator 15 is installed on the upper end of the bracket 14. The actuator 15 and the bracket 14 are fixedly connected by bolts. A square countersunk hole is provided at the bottom of the actuator 15, which cooperates with the outer square body at the end of the valve stem 8. The actuator 15 drives the valve stem 8 to rotate under the drive of the signal gas of a certain pressure supplied by the air source, and the valve stem 8 drives the ball 2 to rotate to realize the switching action of the valve.

[0035] In one embodiment, an adjusting mechanism 100 is provided at the bottom of the valve body 1. After the valve has been in operation for a long time, the valve seat 3 and the ball 2 fall to a sealing position by self-centering under the action of their own gravity. The adjusting mechanism 100 provides a supporting force to ensure the smooth movement of the ball 2. During inspection and maintenance, the adjusting mechanism 100 is used to push the ball 2 upward, and the ball 2 and the valve seat 3 are easier to disassemble and separate from the valve body 1.

[0036] like Figure 2As shown, in one embodiment, the adjustment mechanism 100 includes a protective cover 101, an adjustment screw 102, a sealing gland 103, a packing gasket 104, a lower packing 105, an adjustment support 106, a support gasket 107 and other parts. The outer circle of the adjustment support 106 is provided with two external threads of different lengths, a stuffing box hole is provided on one side of the long thread end, and a 60-degree conical sealing chamfer is provided at the bottom of the step hole provided on the short thread end. The short thread of the adjustment support 106 is screwed into the threaded hole provided at the bottom of the valve body 1, and a support gasket 107 is provided at the connection between the adjustment support 106 and the valve body 1 to ensure that the valve body 1 has no leakage.

[0037] Specifically, the spherical arc end of the adjusting screw 102 passes through the entire support through the tail of the adjusting support 106, and extends from the bottom of the valve body 1 to the bottom of the sphere 2. A group of lower packing 105 is installed between the stuffing box of the adjusting support 106 and the adjusting screw 102, and the lower packing 105 group is sealed by the sealing cover 103.

[0038] Specifically, the threaded section of the adjusting screw 102 cooperates with the internal thread of the sealing cover 103 to achieve the adjustable extension length of the adjusting screw 102 in the valve body 1. The internal thread of the protective cover 101 cooperates with the long thread of the adjusting support 106. The screw-in depth is adjusted according to the exposed length of the adjusting screw 102 after adjustment. Therefore, it can effectively prevent dust particles from the external environment from entering the sealing position of the adjusting mechanism 100, ensuring the tight sealing of the adjusting mechanism 100.

[0039] The one-piece valve body used in the utility model is different from the two-piece and three-piece combined valve bodies. It does not have any assembly joints, which can reduce the number of connection points where leakage occurs and ensure safety and reliability. The flange of the valve body cavity opening faces upward, and the internal parts are assembled from top to bottom, which is convenient for online maintenance and reduces maintenance and repair costs; the two valve seats are installed in a wedge-shaped distribution on the two symmetrical inclined surfaces of the valve body, surrounding the ball. After the valve seat and the ball are worn, they will self-center and re-fit under their own weight to ensure that the valve sealing performance is durable and reliable. A disc spring buffer structure is provided at the connection between the valve stem and the ball, which provides effective buffering protection for the ball during movement, while increasing the fitting force of the valve seat ball and enhancing the sealing performance of the valve. The adjustment mechanism at the bottom of the valve body provides a supporting force to ensure the smooth and stable movement of the ball. When the valve needs to be repaired, the ball is pushed upward through the adjustment mechanism, making it easier to disassemble the ball and the valve seat from the valve body.

[0040] It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A wedge-shaped sealing self-centering regulating top-entry ball valve, comprising a valve body (1), a ball (2), a valve seat (3), a valve seat gasket (5), a valve seat frame (4), a valve stem (8) and a valve cover (9), characterized in that The left and right flow passages of the valve body (1) are provided with inclined surfaces for installing the valve seat (3). Two valve seat frames (4) equipped with valve seats and valve seat sealing gaskets are held and fitted with the upper and lower spherical surfaces of the ball (2) and inserted into the middle cavity of the valve body through the middle flange of the valve body. The valve seat frame is provided with a valve seat sealing gasket on one side which is placed on the inclined surface. A disc spring buffer structure is also provided at the connection between the valve stem (8) and the ball (2).

2. A wedge-shaped sealing self-centering regulating top-entry ball valve according to claim 1, characterized in that The bottom of the valve body (1) is also provided with an adjustment mechanism (100) capable of adjusting the upper and lower positions of the ball.

3. A wedge-shaped sealing self-centering regulating top-entry ball valve according to claim 2, characterized in that The upper and lower ends of the sphere (2) form planes, a spring seat (6) and a disc spring (7) are arranged in sequence between the lower end of the valve stem and the upper plane of the sphere, and a flat groove is provided on the upper plane for cooperating with the flat tenon at the lower end of the valve stem (8) for connection.

4. A wedge-shaped sealing self-centering regulating top-entry ball valve according to claim 3, characterized in that The inclined surface is symmetrical with the center of the valve body cavity as the center. Both end surfaces of the valve seat frame are provided with annular grooves, and the elastic valve seat and the valve seat sealing gasket (5) are installed in the annular grooves.

5. A wedge-shaped sealing self-centering regulating top-entry ball valve according to claim 3, characterized in that The adjustment mechanism comprises a protective cover (101), an adjustment screw (102), a sealing gland (103), a packing gasket (104), an adjustment support (106) and a support sealing gasket (107); the spherical arc surface end of the adjustment screw passes through the entire support via the tail of the adjustment support and extends from the bottom of the valve body to the bottom of the sphere; a group of lower packing is installed between the stuffing box of the adjustment support and the adjustment screw, and the lower packing (105) is compressed and sealed by the sealing gland.

6. A wedge-shaped sealing self-centering regulating top-entry ball valve according to claim 5, characterized in that The outer circle of the adjustment support (106) is provided with two external threads of different lengths, a stuffing box hole is provided on one side of the long thread end, and a conical sealing chamfer is provided on the bottom of the step hole provided on the short thread end. The short thread of the adjustment support (106) is screwed into the threaded hole provided at the bottom of the valve body, and a support sealing gasket (107) is provided at the connection between the adjustment support and the valve body.

7. A wedge-shaped sealing self-centering regulating top-entry ball valve according to claim 6, characterized in that The threaded section of the adjusting screw (102) cooperates with the internal thread of the sealing gland (103), and the internal thread of the protective cover (101) cooperates with the long thread of the adjusting support.

8. A wedge-shaped sealing self-centering regulating top-entry ball valve according to claim 3, characterized in that It also includes a bracket (14) mounted on the upper end surface of the valve cover (9), with a pneumatic actuator (15) mounted on the upper end of the bracket. The pneumatic actuator and the bracket are fixedly connected by bolts, and a square countersunk hole is provided in the bottom of the actuator to match the outer square body of the end of the valve stem (8).

9. A wedge-shaped sealing self-centering regulating top-entry ball valve according to claim 3, characterized in that The valve stem (8) passes through the stuffing box hole at the center of the valve cover (9), and a stuffing pad (10), a stuffing (11), a stuffing gland (12) and a stuffing plate (13) are installed from bottom to top between the stuffing box hole of the valve cover and the valve stem to form a stuffing system.

10. A wedge-shaped sealing self-centering regulating top-entry ball valve according to claim 3, characterized in that The outer circle of the boss at the lower end of the valve cover (9) is matched with the inner hole of the flange opening in the valve body, a winding gasket is provided at the matching position of the valve cover (9) and the valve body (1), and an O-ring is provided on the outer circle of the boss of the valve cover.

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