Full-bore bidirectional sealing C-shaped ball valve

Abstract

The utility model discloses a full-bore two-way sealing C-shaped ball valve which comprises a valve body, a valve cover, a driving device, a valve rod, a ball body and a valve seat, a first installation groove is formed in the valve body, and the valve seat is installed on the first installation groove and used for being matched with the ball body in a sealing mode when the valve is closed. The ball valve further comprises a two-way sealing assembly, a supporting ring, a wave spring and a belleville spring, the valve seat is installed on the first installation groove in a floating mode in the axial direction, a sealing groove is formed in the outer circle face of the end, away from the ball body, of the valve seat, and the belleville spring is arranged on the inner end face of the first installation groove and acts on the supporting ring. A second installation groove is further formed in the inner circle face of the first installation groove, a limiting flange is arranged on the outer circle face of the valve seat, and the wave spring is arranged in the second installation groove and acts on the limiting flange. The two-way sealing valve has a two-way sealing function, and meets the requirements of highest reliability and safety in harsh working conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a full-diameter bidirectional sealing C-type ball valve. Background Art

[0002] Ball valve, the opening and closing part (ball) is driven by the valve stem and rotates around the axis of the ball valve. It can also be used for fluid regulation and control. The hard-sealed V-type ball valve has a strong shear force between its V-type ball core and the metal valve seat with hard alloy surfacing, which is particularly suitable for media containing fibers, tiny solid particles, etc. The multi-way ball valve can not only flexibly control the confluence, diversion, and flow direction switching of the medium on the pipeline, but also close any channel to connect the other two channels. This type of valve should generally be installed horizontally in the pipeline. Ball valves are divided into: pneumatic ball valves, electric ball valves, and manual ball valves according to the driving method.

[0003] However, the existing ball valve can only perform one-way sealing. When the medium flows in the reverse direction, the sealing pair formed by the ball and the valve seat will leak, which cannot meet the requirements of two-way sealing. Utility Model Content

[0004] The utility model aims to provide a full-diameter bidirectional sealing C-type ball valve. The utility model has a bidirectional sealing function and meets the requirements of the highest reliability and safety under harsh working conditions.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a full-diameter bidirectional sealed C-type ball valve, comprising a valve body, a valve cover, a driving device, a valve stem, a ball and a valve seat, the valve cover is mounted on the upper part of the valve body, a bracket is mounted on the valve cover, the driving device is mounted on the bracket, the valve stem passes through the valve body, the output end of the driving device is linked to the valve stem for driving the valve stem to rotate, the inner end of the valve stem is linked to the ball arranged in the valve body, a first mounting groove is provided in the valve body, the valve seat is mounted on the first mounting groove for forming a sealing fit with the ball when the valve is closed; it also includes a bidirectional sealing assembly, a support ring, a wave spring and a disc spring, the valve seat is axially Floatingly installed on the first installation groove, a sealing groove is arranged on the outer circular surface of the valve seat away from the end of the sphere, the disc spring is arranged on the inner end surface of the first installation groove, the disc spring acts on the support ring, prompting the support ring to press the bidirectional sealing component in the sealing groove, and a second installation groove is also arranged on the inner circular surface of the first installation groove, a limiting flange is arranged on the outer circular surface of the valve seat, the wave spring is arranged in the second installation groove and acts on the limiting flange, applying a pre-tightening force to the valve seat in the direction of the sphere; the cross-sectional area enclosed by the contact part of the valve seat and the sphere is smaller than the cross-sectional area enclosed by the inner circular surface of the first installation groove, and the cross-sectional area enclosed by the contact part of the valve seat and the sphere is larger than the cross-sectional area enclosed by the inner circular surface of the sealing groove.

[0006] By adopting the above technical solution, when sealing on the right side: the piston effect is formed by the area difference between A and C. Under the pressure difference of the medium before and after the valve seat, the preload of the disc spring makes the valve seat contact with the ball to play a sealing effect, and the sealing force will increase with the increase of the pressure difference of the medium on the right side; when sealing on the left side: the piston effect is formed by the area difference between A and B. Under the pressure difference of the medium before and after the valve seat, the preload of the wave spring makes the valve seat contact with the ball to play a sealing effect, and the sealing force will increase with the increase of the pressure difference of the medium on the left side. This structure overcomes the various defects of traditional ball valves in harsh working conditions such as deep cold, solid material wear, high and low temperature switching, high frequency switching, and two-way shutoff, and meets the highest reliability and safety requirements of harsh working conditions.

[0007] The utility model is further configured as follows: the bidirectional sealing assembly includes a spacer ring and a combined sealing pad symmetrically arranged on both sides of the spacer ring, the combined sealing pad includes a support pad, an extrusion pad and a plurality of V-shaped sealing pads arranged between the support pad and the extrusion pad, the support pad is arranged at one end of the spacer ring, a V-shaped groove is provided on an end face of the support pad away from the spacer ring, a V-shaped extrusion protrusion is provided on an end face of the extrusion pad close to the spacer ring, and under the action of the support ring, the extrusion pad presses the plurality of V-shaped sealing pads onto the V-shaped groove of the support pad.

[0008] By adopting the above technical solution, this is the first structure of a bidirectional sealing assembly, that is, a V-shaped graphite composite sealing gasket is adopted, wherein two groups of symmetrically arranged composite sealing gaskets are respectively used for forward sealing and reverse sealing, and no matter whether the medium flows in the forward flow or the reverse flow channel, the sealing between the outer circular surface of the valve seat and the inner circular surface of the first mounting groove can be ensured, thereby preventing the upstream medium from leaking to the downstream through the gap between the two when the valve is closed.

[0009] The utility model is further configured to include a pressing sleeve, which is arranged at one end of the two-way sealing assembly away from the supporting ring, the outer circular surface of the pressing sleeve and the outer circular surface of the supporting ring are both fitted with the inner circular surface of the first mounting groove, and the inner circular surface of the pressing sleeve and the inner circular surface of the supporting ring are both fitted with the inner circular surface of the sealing groove.

[0010] By adopting the above technical solution, the compression sleeve and the support ring can evenly and stably squeeze the bidirectional sealing component in the middle under the action of external force, thereby ensuring that the bidirectional sealing component has good sealing performance between the valve seat and the valve body.

[0011] The utility model is further configured as follows: the bidirectional sealing assembly includes a lip-shaped sealing ring, the inner circular surface of the lip-shaped sealing ring is fitted with the inner circular surface of the sealing groove, the outer circular surface of the lip-shaped sealing ring is fitted with the inner circular surface of the first mounting groove, and a lip opening is respectively provided at both ends of the lip-shaped sealing ring, and a metal frame is provided at the inner end of each lip opening of the lip-shaped sealing ring corresponding to the metal frame, the metal frame divides the corresponding lip opening into two annular small cavities, and a support spring is provided in each of the two annular small cavities on the same side.

[0012] By adopting the above technical solution, this is the second structure of the two-way sealing component, that is, a structure using a double-piston lip sealing ring, which has a small stroke between the valve seat and the valve body, is not prone to wear and deformation, and has a longer service life.

[0013] The utility model is further configured that an annular groove is provided on the sealing surface of the valve seat, and a sealing ring for forming a sealing fit with the ball is embedded in the annular groove.

[0014] By adopting the above technical solution, not only can the sealing between the valve seat and the ball be further improved when the valve is closed, but also only the sealing ring on the valve seat needs to be replaced during later maintenance, which is more cost-effective.

[0015] The utility model is further configured such that the position of the disc spring corresponding to the outer circular surface away from the sphere is pressed against the inner end of the first mounting groove, the position of the disc spring corresponding to the inner circular surface close to the sphere is pressed against the support ring, and the inner end surface of the first mounting groove is provided with an annular recess.

[0016] By adopting the above technical solution, not only can the disc spring be stably installed so that it can provide a stable preload force to the support ring, but the design of the annular recess is also more conducive to the deformation of the disc spring.

[0017] The utility model is further configured to include a limiting component, which is installed on the inner wall of the valve body to limit the stroke of the limiting flange towards the direction of movement of the ball; the limiting component includes three open rings, a pressure ring and a plurality of hexagon socket screws, a third mounting groove is also provided on the inner circular surface of the first mounting groove, and an annular limiting groove is provided on the inner edge surface of the third mounting groove. The three open ring is arranged in the third mounting groove to limit the stroke of the limiting flange, and an annular limiting protrusion that fits with the annular limiting groove is provided on the outer circular surface of the three open ring, and the pressure ring is connected to one end of the three open ring close to the ball through a plurality of hexagon socket screws.

[0018] By adopting the above technical solution, the valve seat can be limited by the limit component to prevent the valve seat from being directly ejected by the spring force during disassembly. The installation of the limit component does not require drilling screw holes on the inner wall of the valve body, which greatly facilitates its installation operation and reduces the processing difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of Example 1;

[0020] Figure 2 for Figure 1 The enlarged structural diagram of the middle part I;

[0021] Figure 3 It is a schematic diagram of the overall structure of Example 2;

[0022] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of part II.

[0023] In the figure: 1, valve body; 2, valve cover; 3, drive device; 4, valve stem; 5, ball; 6, valve seat; 7, bracket; 8, first installation groove; 9, two-way sealing assembly; 10, support ring; 11, wave spring; 12, disc spring; 13, sealing groove; 14, second installation groove; 15, limit flange; 16, spacer ring; 17, combined sealing gasket; 18, support gasket; 19, extrusion gasket; 20, V-shaped sealing gasket; 2 1. V-shaped groove; 22. V-shaped extrusion protrusion; 23. Press sleeve; 24. Lip-shaped sealing ring; 25. Lip; 26. Metal frame; 27. Annular small cavity; 28. Support spring; 29. ​​Annular groove; 30. Sealing ring; 31. Annular recess; 32. Limiting assembly; 33. Three-open ring; 34. Pressing ring; 35. Hexagon socket screw; 36. Third installation groove; 37. Annular limiting groove; 38. Annular limiting protrusion. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Embodiment 1: As attached Figure 1 and attached Figure 2A full-diameter bidirectional sealed C-type ball valve shown in the figure comprises a valve body 1, a valve cover 2, a driving device 3, a valve stem 4, a ball 5 and a valve seat 6, wherein the valve cover 2 is mounted on the upper part of the valve body 1, a bracket 7 is mounted on the valve cover 2, the driving device 3 is mounted on the bracket 7, the valve stem 4 passes through the valve body 1, the output end of the driving device 3 is linked to the valve stem 4 for driving the valve stem 4 to rotate, the inner end of the valve stem 4 is linked to the ball 5 in a C-shaped structure arranged in the valve body 1, a first mounting groove 8 is provided in the valve body 1, the valve seat 6 is mounted on the first mounting groove 8 for forming a sealing fit with the ball 5 when the valve is closed; the ball valve also comprises a bidirectional sealing assembly 9, a support ring 10, a wave spring 11 and a disc spring 12, the valve seat 6 is axially floatingly mounted in the first mounting groove 8, a sealing groove 13 is provided on the outer circumferential surface of the valve seat 6 away from the sphere 5, the disc spring 12 is provided on the inner end surface of the first mounting groove 8, the disc spring 12 acts on the support ring 10, prompting the support ring 10 to press the bidirectional sealing component 9 into the sealing groove 13, the inner circumferential surface of the first mounting groove 8 is also provided with a second mounting groove 14, a limiting flange 15 is provided on the outer circumferential surface of the valve seat 6, the wave spring 11 is provided in the second mounting groove 14 and acts on the limiting flange 15, applying a pre-tightening force to the valve seat 6 in the direction of the sphere 5; the cross-sectional area A enclosed by the contact part of the valve seat 6 and the sphere 5 is smaller than the cross-sectional area C enclosed by the inner circumferential surface of the first mounting groove 8, and the cross-sectional area A enclosed by the contact part of the valve seat 6 and the sphere 5 is larger than the cross-sectional area B enclosed by the inner circumferential surface of the sealing groove 13. When sealing on the right side: the piston effect is formed by the area difference between A and C. Under the pressure difference of the medium before and after the valve seat 6, the preload force of the disc spring 12 makes the valve seat 6 contact with the ball 5 to achieve a sealing effect, and the sealing force will increase with the increase of the pressure difference of the medium on the right side; When sealing on the left side: the piston effect is formed by the area difference between A and B. Under the pressure difference of the medium before and after the valve seat 6, the preload force of the wave spring 11 makes the valve seat 6 contact with the ball 5 to achieve a sealing effect, and the sealing force will increase with the increase of the pressure difference of the medium on the left side. This structure overcomes the various defects of traditional ball valves in harsh working conditions such as deep cold, solid material wear, high and low temperature switching, high frequency switching, and two-way shutoff, and meets the highest reliability and safety requirements of harsh working conditions.

[0026] As attached Figure 2As shown, the bidirectional sealing assembly 9 includes a spacer ring 16 and a combination sealing gasket 17 symmetrically arranged on both sides of the spacer ring 16, the combination sealing gasket 17 includes a support gasket 18, an extrusion gasket 19 and a plurality of V-shaped sealing gaskets 20 arranged between the support gasket 18 and the extrusion gasket 19, the support gasket 18 is arranged at one end of the spacer ring 16, a V-shaped groove 21 is arranged on the end face of the support gasket 18 away from the spacer ring 16, and a V-shaped extrusion protrusion 22 is arranged on the end face of the extrusion gasket 19 close to the spacer ring 16, and the extrusion gasket 19, under the action of the support ring 10, presses the plurality of V-shaped sealing gaskets 20 on the V-shaped groove 21 of the support gasket 18. This is the first structure of the bidirectional sealing assembly 9, that is, using a V-shaped graphite combination sealing gasket 17, wherein two groups of symmetrically arranged combination sealing gaskets 17 are used for forward sealing and reverse sealing respectively, and whether the medium is in the forward flow or reverse flow channel, the sealing between the outer cylindrical surface of the valve seat 6 and the inner cylindrical surface of the first mounting groove 8 can be ensured to prevent the upstream medium from leaking from the gap between the two to the downstream when the valve is closed.

[0027] As attached Figure 2 As shown, a pressing sleeve 23 is also included, and the pressing sleeve 23 is arranged at one end of the two-way sealing component 9 away from the support ring 10. The outer circumferential surface of the pressing sleeve 23 and the outer circumferential surface of the support ring 10 are both in contact with the inner circumferential surface of the first installation groove 8, and the inner circumferential surface of the pressing sleeve 23 and the inner circumferential surface of the support ring 10 are both in contact with the inner circumferential surface of the sealing groove 13. The pressing sleeve 23 and the support ring 10 can uniformly and stably squeeze the two-way sealing component 9 in the middle under the action of external force, thereby ensuring that the two-way sealing component 9 has good sealing performance between the valve seat 6 and the valve body 1.

[0028] As attached Figure 2 As shown, the position of the disc spring 12 away from the sphere 5 corresponding to the outer circular surface is tightly pressed against the inner end of the first installation groove 8, and the position of the disc spring 12 close to the sphere 5 corresponding to the inner circular surface is tightly pressed against the support ring 10, and the inner end surface of the first installation groove 8 is provided with an annular recess 31. This design can not only realize the stable installation of the disc spring 12, so that it provides a stable preload force to the support ring 10, but also the design of the annular recess 31 is more conducive to the deformation of the disc spring 12.

[0029] As attached Figure 2As shown, it also includes a limiting component 32, which is installed on the inner wall of the valve body 1 and is used to limit the stroke of the limiting flange 15 towards the direction of movement close to the sphere 5; the limiting component 32 includes a three-open ring 33, a pressure ring 34 and a plurality of hexagon socket screws 35, and a third mounting groove 36 is also provided on the inner circumferential surface of the first mounting groove 8, and an annular limiting groove 37 is provided on the inner edge surface of the third mounting groove 36. The three-open ring 33 is arranged in the third mounting groove 36 to limit the stroke of the limiting flange 15, and an annular limiting protrusion 38 matching the annular limiting groove 37 is provided on the outer circumferential surface of the three-open ring 33, and the pressure ring 34 is connected to one end of the three-open ring 33 close to the sphere 5 through a plurality of hexagon socket screws 35, that is, a through hole for the hexagon socket screw 35 to pass through is provided on the pressure ring 34, and a screw hole for the hexagon socket screw 35 to be screwed in is provided on the three-open ring 33. The valve seat 6 can be limited by the limiting component 32 to prevent the valve seat 6 from being directly ejected by the spring force during disassembly. The limiting component 32 does not require drilling screw holes on the inner wall of the valve body 1, which greatly facilitates its installation operation and reduces the difficulty of processing.

[0030] Embodiment 2: As attached Figure 3 and attached Figure 4 As shown, the bidirectional sealing assembly 9 includes a lip seal ring 24, the inner circumferential surface of the lip seal ring 24 is in contact with the inner circumferential surface of the sealing groove 13, the outer circumferential surface of the lip seal ring 24 is in contact with the inner circumferential surface of the first mounting groove 8, and a lip opening 25 is provided at each end of the lip seal ring 24, and a metal skeleton 26 is provided at the inner end of each lip opening 25 of the lip seal ring 24, and the metal skeleton 26 divides the corresponding lip opening 25 into two annular small cavities 27, and a supporting spring 28 is provided in each of the two annular small cavities 27 on the same side. This is the second structure of the bidirectional sealing assembly 9, that is, the structure of the double piston lip seal ring 24, which has a small stroke between the valve seat 6 and the valve body 1, is not easy to produce wear and deformation, and has a longer service life.

[0031] As attached Figure 4 As shown, an annular groove 29 is provided on the sealing surface of the valve seat 6, and a sealing ring 30 for forming a sealing match with the ball 5 is embedded in the annular groove 29, and the end of the sealing ring 30 in contact with the ball 5 is an arc surface. This design can not only further improve the sealing performance between the valve seat 6 and the ball 5 when the valve is closed, but also only need to replace the sealing ring 30 on the valve seat 6 for maintenance in the later stage, which is lower in cost.

Claims

1. A full-diameter bidirectional sealed C-type ball valve, comprising a valve body (1), a valve cover (2), a driving device (3), a valve stem (4), a ball (5) and a valve seat (6), wherein the valve cover (2) is mounted on the upper part of the valve body (1), a bracket (7) is mounted on the valve cover (2), the driving device (3) is mounted on the bracket (7), the valve stem (4) passes through the valve body (1), the output end of the driving device (3) is linked to the valve stem (4) for driving the valve stem (4) to rotate, the inner end of the valve stem (4) is linked to the ball (5) in a C-shaped structure arranged in the valve body (1), a first mounting groove (8) is arranged in the valve body (1), and the valve seat (6) is mounted on the first mounting groove (8) for forming a sealing fit with the ball (5) when the valve is closed; characterized in that: The valve seat (6) is axially mounted in a floating manner on the first mounting groove (8). A sealing groove (13) is arranged on the outer circumferential surface of the end of the valve seat (6) away from the spherical body (5). The disc spring (12) is arranged on the inner end surface of the first mounting groove (8). The disc spring (12) acts on the supporting ring (10) to cause the supporting ring (10) to press the bidirectional sealing assembly (9) into the sealing groove (13). The first mounting groove (8) A second mounting groove (14) is also provided on the inner circular surface, and a limiting flange (15) is provided on the outer circular surface of the valve seat (6). The wave spring (11) is arranged in the second mounting groove (14) and acts on the limiting flange (15) to apply a pre-tightening force to the valve seat (6) in the direction of the sphere (5); the cross-sectional area enclosed by the contact portion between the valve seat (6) and the sphere (5) is smaller than the cross-sectional area enclosed by the inner circular surface of the first mounting groove (8), and the cross-sectional area enclosed by the contact portion between the valve seat (6) and the sphere (5) is larger than the cross-sectional area enclosed by the inner circular surface of the sealing groove (13).

2. A full-diameter bidirectional sealing C-type ball valve according to claim 1, characterized in that: The bidirectional sealing assembly (9) comprises a spacer ring (16) and a combined sealing gasket (17) symmetrically arranged on both sides of the spacer ring (16); the combined sealing gasket (17) comprises a support gasket (18), an extrusion gasket (19) and a plurality of V-shaped sealing gaskets (20) arranged between the support gasket (18) and the extrusion gasket (19); the support gasket (18) is arranged at one end of the spacer ring (16); a V-shaped groove (21) is provided on an end surface of the support gasket (18) away from the spacer ring (16); a V-shaped extrusion protrusion (22) is provided on an end surface of the extrusion gasket (19) close to the spacer ring (16); and under the action of the support ring (10), the extrusion gasket (19) presses the plurality of V-shaped sealing gaskets (20) onto the V-shaped groove (21) of the support gasket (18).

3. A full-diameter bidirectional sealing C-type ball valve according to claim 2, characterized in that: It also includes a pressing sleeve (23), which is arranged at one end of the bidirectional sealing assembly (9) away from the supporting ring (10), the outer circular surface of the pressing sleeve (23) and the outer circular surface of the supporting ring (10) are both in contact with the inner circular surface of the first mounting groove (8), and the inner circular surface of the pressing sleeve (23) and the inner circular surface of the supporting ring (10) are both in contact with the inner circular surface of the sealing groove (13).

4. A full-diameter bidirectional sealing C-type ball valve according to claim 1, characterized in that: The bidirectional sealing assembly (9) comprises a lip seal ring (24), the inner circumferential surface of the lip seal ring (24) is in contact with the inner circumferential surface of the sealing groove (13), the outer circumferential surface of the lip seal ring (24) is in contact with the inner circumferential surface of the first mounting groove (8), the two ends of the lip seal ring (24) are respectively provided with a lip opening (25), and the inner end of each lip opening (25) of the lip seal ring (24) is provided with a metal frame (26), the metal frame (26) divides the corresponding lip opening (25) into two annular small cavities (27), and a supporting spring (28) is provided in each of the two annular small cavities (27) on the same side.

5. A full-diameter bidirectional sealing C-type ball valve according to claim 4, characterized in that: An annular groove (29) is provided on the sealing surface of the valve seat (6), and a sealing ring (30) is embedded in the annular groove (29) for forming a sealing fit with the ball (5).

6. A full-diameter bidirectional sealing C-type ball valve according to claim 1, characterized in that: The position of the outer circular surface of the disc spring (12) away from the sphere (5) is pressed against the inner end of the first mounting groove (8), and the position of the inner circular surface of the disc spring (12) close to the sphere (5) is pressed against the support ring (10), and the inner end surface of the first mounting groove (8) is provided with an annular recess (31).

7. A full-diameter bidirectional sealing C-type ball valve according to claim 1, characterized in that: The valve body (1) further comprises a limit assembly (32), which is mounted on the inner wall of the valve body (1) and is used to limit the travel of the limit flange (15) in the direction of movement close to the spherical body (5); the limit assembly (32) comprises a three-open ring (33), a pressure ring (34) and a plurality of hexagon socket screws (35); a third mounting groove (36) is also arranged on the inner circumferential surface of the first mounting groove (8); an annular limit groove (37) is arranged on the inner edge surface of the third mounting groove (36); the three-open ring (33) is arranged in the third mounting groove (36) and is used to limit the travel of the limit flange (15); an annular limit protrusion (38) which matches the annular limit groove (37) is arranged on the outer circumferential surface of the three-open ring (33); the pressure ring (34) is connected to one end of the three-open ring (33) close to the spherical body (5) through a plurality of hexagon socket screws (35).

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