Top-mounted C-shaped bidirectional high-pressure sealing ball valve with concave-convex wheel mechanism

Abstract

The invention provides a top-mounted C-shaped bidirectional high-pressure sealing ball valve with a concave-convex wheel mechanism. The top-mounted C-shaped bidirectional high-pressure sealing ball valve comprises a valve body, a first concave wheel step is arranged at the bottom of the valve body, an upper cover is arranged at the top end of the valve body, and a second concave wheel step is arranged at the bottom of the upper cover; a groove is formed in the bottom of the valve body, a valve ball is arranged in the groove, a valve shaft is arranged on the top of an upper ball handle of the valve ball, and an upper ball handle of the valve shaft penetrates through the upper cover and extends out of the upper cover. A pressing ring is arranged on the inner side of the valve body flow channel and provided with a valve seat, and the valve ball is matched with the valve seat. The valve ball is a double-eccentric C-shaped ball, cam steps are arranged at the ends of an upper ball handle and a lower ball handle of the valve ball, and the cam steps are matched with the first concave wheel step and the second concave wheel step in a clamped mode. Under the severe working conditions of high-pressure two-way sealing, solid-containing, easy-to-crystallize, easy-to-erode media and the like, the high-pressure two-way sealing device not only has more excellent two-way sealing performance, but also has the advantages of high pressure resistance, erosion resistance, low running torque, long service life, low maintenance cost and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a top-mounted C-type two-way high-pressure sealed ball valve with a concave and convex cam mechanism. Background Art

[0002] Valves play a crucial role in the chemical industry. Ball valves are widely used in industries such as petroleum, chemical, metallurgy, electric power, and water treatment due to their simple structure, small size, light weight, and convenient operation, and have a high market demand. However, under harsh and complex working conditions such as high temperature, high pressure, containing solids, erosion, and easy crystallization, conventional ball valves have structural limitations such as easy material accumulation in the middle cavity, easy wear due to long-term contact between the valve seat and the valve ball, easy blockage of the spring cavity behind the valve seat, easy jamming or even sticking under high temperature and high pressure conditions, and inconvenient on-line maintenance, and cannot be applied to harsh and complex working conditions.

[0003] In recent years, many manufacturers have introduced C-type ball valves. Their dead-space-free and full-bore design structures solve the problems of overpressure and material accumulation in the valve cavity; the eccentric design produces a wedging effect, relying on torque for forced sealing. When opening, the valve ball is instantaneously separated from the valve seat, greatly reducing the operating torque and at the same time improving the opening and closing response speed of the valve; and the C-shaped channel has the same advantages as the O-shaped channel, such as small flow resistance and large flow capacity.

[0004] C-type ball valves have greatly expanded the application fields of ball valves. However, due to the limitations of the C-type ball valve structure itself, when the reverse medium pressure increases, the medium pressure helps the ball seat seal. When the forward medium pressure increases, the medium pushes the valve ball away from the valve seat, and positive high-pressure sealing cannot be achieved. Therefore, most of the C-type ball valves produced by manufacturers cannot be used in working conditions with two-way high-pressure sealing. Summary of the Invention

[0005] Aiming at the deficiencies existing in the prior art, the present invention provides a top-mounted C-type two-way high-pressure sealed ball valve with a concave and convex cam mechanism, which has the advantages of high-pressure two-way sealing, erosion resistance, low operating torque, long service life, and low maintenance cost.

[0006] The technical solution adopted by the present invention is as follows: A top-mounted C-type two-way high-pressure sealed ball valve with a concave and convex cam mechanism, comprising: a valve body, a first concave cam step is provided at the bottom of the valve body, an upper cover is provided at the top of the valve body, and a second concave cam step is provided at the bottom of the upper cover; A groove is provided at the bottom of the valve body, a valve ball is provided in the groove, a valve shaft is provided at the top of the upper ball stem of the valve ball, and the valve shaft passes through the upper cover and extends outside the upper cover; A pressure ring is arranged on the inner side of the valve body flow channel, a valve seat is arranged on the pressure ring, and the valve ball and the valve seat cooperate with each other; the valve ball is a double-eccentric C-shaped ball, and cam steps are arranged at the ends of the upper ball handle and the lower ball handle of the valve ball, and the cam steps are clamped and matched with the first concave cam step and the second concave cam step.

[0007] Preferably, for the top-mounted C-shaped two-way high-pressure sealing ball valve with a cam mechanism, wherein: an inner cavity is arranged on the side of the upper cover facing the valve body, and a plurality of through holes for placing packing, packing gaskets, plain bearings, and bushings are arranged in the inner cavity. The bushing, plain bearing, packing gasket, and packing are sequentially arranged in the plurality of through holes of the upper cover from bottom to top, and the plain bearing is sleeved on the valve shaft.

[0008] Preferably, for the top-mounted C-shaped two-way high-pressure sealing ball valve with a cam mechanism, wherein: the bushing is sealed with the upper cover, the valve body, and the valve ball through a dust-proof ring and a metal C-shaped ring.

[0009] Preferably, for the top-mounted C-shaped two-way high-pressure sealing ball valve with a cam mechanism, wherein: a metal wound gasket is arranged between the upper cover and the valve body, and the upper cover and the valve body are fixed through a first stud and a first nut.

[0010] Preferably, for the top-mounted C-shaped two-way high-pressure sealing ball valve with a cam mechanism, wherein: a packing gland and a packing pressing plate are sequentially arranged on the top of the packing from bottom to top. The packing gland, the packing pressing plate, and the upper cover are fixed through a second stud and a second nut, and a disc spring is arranged between the second nut and the packing pressing plate.

[0011] Preferably, for the top-mounted C-shaped two-way high-pressure sealing ball valve with a cam mechanism, wherein: the pressure ring is fixed on the valve body through a threaded connection, a metal wound gasket is arranged between the pressure ring and the valve body, and the valve seat is fixed on the pressure ring through an inner hexagonal screw and a lock washer.

[0012] Preferably, for the top-mounted C-shaped two-way high-pressure sealing ball valve with a cam mechanism, wherein: a boss is arranged at the top of the upper ball handle of the valve ball, a groove is arranged at the corresponding position on the valve shaft for the boss, and the groove and the corresponding boss are clamped and matched. Bushings are arranged at the upper ball handle and the lower ball handle of the valve ball.

[0013] Preferably, for the top-mounted C-shaped two-way high-pressure sealing ball valve with a cam mechanism, wherein: a first alloy layer is arranged on the outer peripheries of the cam step, the first concave cam step, and the second concave cam step, and a second alloy layer is arranged on the spherical surface and the inner cavity of the valve ball.

[0014] Preferably, for the top-mounted C-shaped two-way high-pressure sealing ball valve with a cam mechanism, wherein: the valve body is of an integral structure.

[0015] Preferably, in the top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism, the outer peripheral contact surfaces of the upper cover, plain bearing, valve shaft, valve ball, and bushing are all provided with a third alloy layer.

[0016] Advantages of the present invention: (1) In the top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism of the present invention, the valve ball and valve seat adopt a torque forced sealing design, and the valve ball, upper cover, and valve body adopt a cam structure; when the valve is closed, when the reverse medium pressure difference increases, the medium pressure difference helps the sealing between the valve ball and the valve seat; when the forward medium pressure difference increases, the cam wedge-type anti-rotation structure between the valve ball, upper cover, and valve body helps to prevent the forward medium pressure difference from pushing the valve ball away from the valve seat, thereby achieving high-pressure forward sealing and excellent high-pressure two-way sealing performance; the contact surface is subjected to local hardening treatment to form a rigid limit, improving the strength and wear resistance of the limit surface and extending the service life of the valve.

[0017] (2) In the top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism of the present invention, the valve seat is fixed on the pressure ring by hexagon socket head cap screws and lock washers, and the pressure ring is fixed on the valve body by threaded connection to form a fixed valve seat. The fixed valve seat structure has the advantages of no spring and no cavity, and there is no failure of the valve seat elastic compensation caused by material accumulation, resulting in an increase in operating torque, valve jamming, or even seizure; the single-valve seat structure has a smooth internal flow path of the valve and no dead zone, avoiding the accumulation and crystallization of the medium.

[0018] (3) In the top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism of the present invention, the valve ball adopts a double-eccentric C-type structure. During operation, the valve ball does not contact the valve seat, thereby effectively reducing the operating torque.

[0019] (4) In the top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism of the present invention, the bushing is sealed with a dust ring and a metal C-ring between the upper cover, valve body, and valve ball to prevent solid particles from entering the valve shaft and bushing, effectively avoiding the valve shaft and bushing from being scratched, resulting in valve jamming or even seizure.

[0020] (5) In the top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism of the present invention, the valve adopts a top-mounted overall design, and the valve internals can be replaced online, with low maintenance costs.

[0021] (6) In the top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism of the present invention, it is erosion-resistant and erosion-wash-resistant. The contact surfaces of the valve ball surface, flow path, upper cover, plain bearing, valve shaft, valve ball, and bushing are all sprayed with alloys such as Cr3C2, WC, and Ni60, having the advantages of high pressure resistance, erosion resistance, and long service life. Description of the Drawings

[0022] Figure 1This is a schematic structural diagram of the top-mounted C-type two-way high-pressure seal ball valve with a cam mechanism according to the present invention.

[0023] Figure 2 It is Figure 1 the partial enlarged view of A-A of

[0024] Figure 3 This is a sectional view of the top-mounted C-type two-way high-pressure seal ball valve with a cam mechanism according to the present invention. Specific embodiments

[0025] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0026] As Figures 1 - 3 , a top-mounted C-type two-way high-pressure seal ball valve with a cam mechanism, which includes a valve body 19. A first concave cam step 19-1 is provided at the bottom of the valve body 19, and a top cover 9 is provided at the top of the valve body 19. A second concave cam step 9-1 is provided at the bottom of the top cover 9; A groove is provided at the bottom of the valve body 19, and a valve ball 17 is provided in the groove. The top of the upper ball stem of the valve ball 17 is provided with a valve shaft 1, and the valve shaft 1 passes through the top cover 9 and extends outside the top cover 9; A pressure ring 13 is provided on the inner side of the flow passage of the valve body 19, and a valve seat 16 is provided on the pressure ring 13. The valve ball 17 and the valve seat 16 cooperate with each other; the valve ball 17 is a double-eccentric C-type ball, and cam steps 17-1 are provided at both ends of the upper ball stem and the lower ball stem of the valve ball 17. The cam steps 17-1 are in snap-fit with the first concave cam step 19-1 and the second concave cam step 9-1.

[0027] An inner cavity is provided on the side of the top cover 9 facing the valve body 19. The inner cavity is provided with a plurality of through holes for placing a packing 7, a packing gasket 8, a plain bearing 10, and a bushing 12. The bushing 12, the plain bearing 10, the packing gasket 8, and the packing 7 are sequentially arranged in the plurality of through holes of the top cover 9 from bottom to top. The plain bearing 10 is sleeved on the valve shaft 1; the material of the packing 7 can be one of graphite and polytetrafluoroethylene.

[0028] The bushing 12 is sealed with the top cover 9, the valve body 19, and the valve ball 17 through a dust-proof ring 22 and a metal C-ring 23.

[0029] A metal wound gasket 11 is provided between the top cover 9 and the valve body 19, and the top cover 9 and the valve body 19 are fixed by a first stud 20 and a first nut 21.

[0030] A packing gland 6 and a packing plate 5 are sequentially arranged on the top of the packing 7 from bottom to top. The packing gland 6, the packing plate 5, and the top cover 9 are fixed by a second stud 2 and a second nut 3. A disc spring 4 is provided between the second nut 3 and the packing plate 5.

[0031] The pressing ring 13 is fixed on the valve body 19 by threaded connection. A metal wound gasket 18 is arranged between the pressing ring 13 and the valve body 19. The valve seat 16 is fixed on the pressing ring 13 by socket head cap screws 14 and lock washers 15.

[0032] A boss is arranged at the top of the upper ball handle of the valve ball 17. A groove is arranged at the position corresponding to the boss on the valve shaft 1. The groove and the corresponding boss are clamped and matched. Bushings 12 are arranged at the upper ball handle and the lower ball handle of the valve ball 17.

[0033] A first alloy layer is arranged on the outer periphery of the cam step 17-1, the first concave cam step 19-1, and the second concave cam step 9-1. A second alloy layer is arranged on the spherical surface and the inner cavity of the valve ball 17. The valve body 19 is of an integral structure. The material of the first alloy layer is STL20 alloy. The material of the second alloy layer is selected from one of Cr3C2, WC, and Ni60 alloy. A third alloy layer is arranged on the outer peripheral contact surfaces of the upper cover 9, the plain bearing 10, the valve shaft 1, the valve ball 17, and the bushing 12. The material of the third alloy layer is selected from one of Cr3C2, WC, and Ni60 alloy.

[0034] The installation process of the present invention: As Figure 1 , the valve seat 16 is fixed on the pressing ring 13 by socket head cap screws 14 and lock washers 15. The metal wound gasket 18 is placed in the groove of the pressing ring 13 and is screwed into the valve body 19 together with the pressing ring 13 and tightened. As Figure 2 , the dust-proof ring 22 and the metal C-ring 23 are installed in the bushing 12 and are installed on the upper ball handle and the lower ball handle of the valve ball 17 together with the bushing 12. As Figure 1 , the lower ball handle of the valve ball 17 is installed in the bottom groove of the valve body 19. The groove of the valve shaft 1 is installed in the boss at the top of the upper ball handle of the valve ball 17. The plain bearing 10 is sleeved on the valve shaft 1. A metal wound gasket 11 is installed between the upper cover 9 and the valve body 19 and is tightened with the first stud 20 and the first nut 21. The first stud 20 is a full-thread stud 20, and the first nut 21 is a type II hexagon nut 21. A packing gasket 8, packing 7, packing gland 6, and packing pressing plate 5 are installed in the inner cavity of the upper cover 9 from bottom to top in sequence. Then a disc spring 4 is arranged between the second nut 3 and the packing pressing plate 5. Finally, it is tightened with the full-thread stud 2 and the type II hexagon nut 3.

[0035] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention rather than to limit. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A top-mounted C-type bidirectional high-pressure sealed ball valve with a cam mechanism, characterized in that: It includes a valve body (19), a first cam step (19-1) is provided at the bottom of the valve body (19), an upper cover (9) is provided at the top of the valve body (19), and a second cam step (9-1) is provided at the bottom of the upper cover (9); A groove is provided at the bottom of the valve body (19), a valve ball (17) is arranged in the groove, a valve shaft (1) is arranged at the top of the upper ball handle of the valve ball (17), and the valve shaft (1) passes through the upper cover (9) and extends outside the upper cover (9); A pressure ring (13) is arranged on the inner side of the flow channel of the valve body (19), a valve seat (16) is arranged on the pressure ring (13), and the valve ball (17) and the valve seat (16) cooperate with each other; the valve ball (17) is a double-eccentric C-shaped ball, and cam steps (17-1) are arranged at both ends of the upper ball handle and the lower ball handle of the valve ball (17), and the cam steps (17-1) are clamped and matched with the first cam step (19-1) and the second cam step (9-1).

2. The top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism according to claim 1, characterized in that: An inner cavity is provided on the side of the upper cover (9) facing the valve body (19), and a plurality of through holes for placing a packing (7), a packing gasket (8), a plain bearing (10), and a bushing (12) are provided in the inner cavity. The bushing (12), the plain bearing (10), the packing gasket (8), and the packing (7) are sequentially arranged in the plurality of through holes of the upper cover (9) from bottom to top, and the plain bearing (10) is sleeved on the valve shaft (1).

3. The top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism according to claim 2, characterized in that: The bushing (12) is sealed with the upper cover (9), the valve body (19), and the valve ball (17) through a dust-proof ring (22) and a metal C-ring (23).

4. The top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism according to claim 1, characterized in that: A metal wound gasket (11) is arranged between the upper cover (9) and the valve body (19), and the upper cover (9) and the valve body (19) are fixed by a first stud (20) and a first nut (21).

5. The top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism according to claim 2, characterized in that: A packing gland (6) and a packing pressing plate (5) are sequentially arranged at the top of the packing (7) from bottom to top. The packing gland (6), the packing pressing plate (5), and the upper cover (9) are fixed by a second stud (2) and a second nut (3), and a disc spring (4) is arranged between the second nut (3) and the packing pressing plate (5).

6. The top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism according to claim 1, characterized in that: The pressure ring (13) is fixed on the valve body (19) by threaded connection, a metal wound gasket (18) is arranged between the pressure ring (13) and the valve body (19), and the valve seat (16) is fixed on the pressure ring (13) by an inner hexagon screw (14) and a lock washer (15).

7. The top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism according to claim 2, characterized in that: A boss is arranged at the top of the upper ball handle of the valve ball (17), a groove is arranged at the corresponding position of the valve shaft (1) to the boss, and the groove and the corresponding boss are clamped and matched. A bushing (12) is arranged at the upper ball handle and the lower ball handle of the valve ball (17).

8. The top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism according to claim 1, characterized in that: A first alloy layer is arranged on the outer periphery of the cam step (17-1), the first cam step (19-1), and the second cam step (19-1), and a second alloy layer is arranged on the spherical surface and the inner cavity of the valve ball (17).

9. The top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism according to claim 1, characterized in that: The valve body (19) is of an integral structure.

10. The top-mounted C-type two-way high-pressure sealed ball valve with a cam mechanism according to claim 7, characterized in that: A third alloy layer is arranged on the outer peripheral contact surfaces of the upper cover (9), the plain bearing (10), the valve shaft (1), the valve ball (17), and the bushing (12).

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