High-pressure hard sealing ball valve structure

Abstract

A high-pressure hard sealing ball valve structure comprises a ball body, a valve rod, an upper cover, a valve seat and a valve body, a feeding port, a discharging port and the ball body are arranged in the valve body, a sealing assembly is arranged between the valve body and the valve rod, and the sealing assembly comprises a main seal, an auxiliary seal and low-leakage filler. The main seal comprises a main sealing ring arranged below the shoulder part of the valve rod and an elastic check ring for limiting the lower part of the main sealing ring; the auxiliary seal comprises an auxiliary sealing ring arranged above the shoulder part of the valve rod and a packing pad for limiting the auxiliary sealing ring; the low-leakage packing set is limited between the upper cover and the packing pad, and at least part of the lower end of the upper cover stretches into the position between the valve body and the valve rod so as to press the low-leakage packing set. According to the high-pressure hard sealing ball valve structure, leakage points are reduced by changing the sealing structure, so that the cost is reduced, and the leakage points of the valve can be accurately positioned.

Description

Technical Field

[0001] This utility model relates to the field of ball valves, and in particular to an automatic chip testing station. Background Technology

[0002] Valves used in onshore and offshore platform condensate gas extraction projects are characterized by high medium pressure, high switching frequency, and high maintenance and replacement difficulty. The requirements for the seals of these valves are more stringent and of higher quality. At the same time, the valve parts are larger, the number of seals is greater, and the disassembly and assembly are more difficult. Therefore, the valves are required to have reliable sealing performance, low manufacturing cost, and convenient and quick maintenance. Therefore, reducing the number of seals, reducing the number of leakage points, reducing the size of parts, and enabling quick location and repair of leakage points are of great significance for improving the stability of valves in use and enhancing the competitiveness of valves with other similar products.

[0003] Currently, most products for high-pressure valves use an increased number of seals. In addition to primary and secondary seals, 1-2 auxiliary seals are added between the valve body and the top cover, and between the top cover and the valve stem to achieve the ideal sealing effect. In terms of detecting valve leaks, if the valve has internal leakage, the valve seat and ball are usually removed, and the sealing dimensions of the valve seat, valve body, and ball are re-inspected.

[0004] Therefore, this utility model proposes a high-pressure hard-seal ball valve structure that reduces leakage points by changing the structure, thereby reducing costs and accurately locating valve leakage points. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a high-pressure hard-seal ball valve structure that reduces leakage points by changing the structure, thereby reducing costs and accurately locating valve leakage points, thus solving the problems in the background technology mentioned above.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A high-pressure hard-seal ball valve structure includes a ball, a valve stem, a top cover, a valve seat, and a valve body. The valve body is provided with an inlet and an outlet. A sealing assembly is provided between the ball, the valve body, and the valve stem. The sealing assembly includes a main seal, an auxiliary seal, and low-leakage packing. The main seal includes a main sealing ring disposed below the shoulder of the valve stem and an elastic retaining ring that limits the lower part of the main sealing ring. The auxiliary seal includes an auxiliary sealing ring disposed above the shoulder of the valve stem and a packing pad that limits the auxiliary sealing ring. The low-leakage packing assembly is located between the top cover and the packing pad, and at least part of the lower end of the top cover extends between the valve body and the valve stem to press the low-leakage packing assembly.

[0007] Preferably, the valve body includes a left valve body and a right valve body, each having an inlet and an outlet, respectively, and a middle body disposed between the left and right valve bodies, the middle body being positioned between the upper cover spheres; the lower end of the upper cover extends into the middle body and the valve stem to form a first sealing cavity, and the sealing assembly is disposed within the first sealing cavity.

[0008] Preferably, the upper cover includes a first positioning part, the lower end of the upper cover extending between the middle body and the valve stem is the first positioning part, and the first positioning part cooperates with the middle body.

[0009] Preferably, the lower end of the valve stem is provided with a second positioning part, the main seal and the auxiliary seal are disposed between the second positioning part and the middle body, and the packing gasket is steppedly fitted with the second positioning part.

[0010] Preferably, the valve stem shoulder protrudes from the outer periphery of the second positioning part.

[0011] Preferably, the lower end of the inner side of the middle body is provided with an annular protrusion, and the lower end of the elastic retaining ring is limited and matched with the annular protrusion.

[0012] Preferably, a support plate is provided between the middle body and the sphere, with the lower end of the support plate connected to the sphere and the upper end in close contact with the middle body.

[0013] Preferably, a second sealing cavity and an O-ring for sealing the second sealing cavity are provided between the valve seat and the valve body near the feed inlet.

[0014] Preferably, a detection groove is provided on the valve seat on the side of the O-ring near the ball, and the detection groove has a guide slope on the side of the O-ring near the ball.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. By changing the valve structure, the seals between the top cover and the valve body and between the top cover and the valve stem are merged into the seal between the top cover and the valve stem. The number of leakage points is reduced from two to one, reducing one leakage point, increasing the reliability of the seal, reducing valve cost, reducing the number of spare parts, and reducing customer operating costs.

[0017] 2. Reduce leakage points and lower costs. High-pressure valve seals are very expensive; each additional seal significantly increases costs. Furthermore, customers typically maintain a certain percentage of spare valve parts, further increasing procurement costs. A larger number of seals also increases the difficulty and efficiency of valve installation. Reducing the number of seals simultaneously reduces leakage points.

[0018] 3. Add a leak detection O-ring to the valve seat. When the valve seat leaks, the medium will push the O-ring to move. By observing the position of the O-ring, it can be determined whether there is a leak between the valve seat and the valve body, thus accurately locating the leak point and increasing maintenance efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0020] Figure 1 This is a schematic diagram of the overall structure of a high-pressure hard-seal ball valve according to the present invention;

[0021] Figure 2 for Figure 1 An enlarged schematic diagram of the seal between the valve stem and the valve body at point A in the structure;

[0022] Figure 3 for Figure 1 An enlarged schematic diagram of the valve seat position at point B in the structure;

[0023] In the diagram: 1-Sphere; 2-Supporting plate;

[0024] 3-Main seal; 301-Shaft retaining ring; 302-Main seal ring;

[0025] 4-Auxiliary seal; 401-Auxiliary sealing ring; 402-Packaging gasket;

[0026] 5-Low-leakage packing assembly; 6-Middle body; 7-Valve stem; 701-Valve stem shoulder; 702-Second positioning part; 8-Top cover; 801-First positioning part; 9-O-ring; 10-Valve seat; 101-Guide slope; 102-Detection groove; 11-Sealing ring; 12-Valve body; 121-Left valve body; 122-Right valve body. Detailed Implementation

[0027] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0028] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0029] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0030] Example:

[0031] Please see Figures 1 to 3 In an embodiment of this utility model, a high-pressure hard-seal ball valve structure includes a valve body 12, a ball 1, a valve stem 7, an upper cover 8, and a valve seat 10. The valve body 12 is divided into left and right parts. The left valve body 121 has a feed inlet, and the right valve body 122 has a discharge outlet. The ball 1 is coaxially arranged inside the valve body 12. The valve seat 10 is located between the valve seat 10 and the ball 1, and a sealing ring 11 is provided between the valve seat 10 and the valve body 12. A small cross-section O-ring 9 is provided on the pressure-bearing back side of the valve seat 10 near the feed inlet. A support is provided on the upper end of the ball 1. Plate 2, the middle body 6 is located between the left and right valve bodies 12, and its lower end contacts the support plate 2. The lower end of the valve stem 7 extends into the middle body 6 and is fixedly connected to the valve stem 7. The upper end passes through the upper cover 8. The upper cover 8 is fixedly connected to the middle body 6 by screws. The lower end of the upper cover 8 extends into the middle body 6 and forms a sealing cavity with the valve stem 7. The sealing cavity is divided into upper and lower chambers by the valve stem shoulder 701. The lower chamber is provided with a main seal 3, and the upper chamber is provided with an auxiliary seal 4 and a low-leakage packing group 5, which are pressed together by the upper cover 8 to form a seal.

[0032] Specifically, by changing the structure of the seals between the upper cover 8 and the valve body 12 and between the upper cover 8 and the valve stem 7, and merging them into the space between the upper cover 8 and the valve stem 7, the sealing point is reduced from two to one, eliminating one seal and lowering costs. Since there is no sealing surface between the upper cover 8 and the valve body 12, the outer diameter of the upper cover 8 can be reduced, thus reducing the weight of the upper cover and further reducing costs. The seal between the upper cover 8 and the valve stem 7 is moved to the space between the valve stem 7 and the valve body 12, eliminating the need for an additional connecting disc part to seal the packing. At the same time, the worm gear can be directly installed on the upper cover, eliminating one connecting disc part and reducing the fasteners used to install the connecting disc.

[0033] In this embodiment of the utility model, the main seal 3 includes a shaft elastic retaining ring 301 and a main sealing ring 302. The shaft elastic retaining ring 301 is disposed at the lower end of the main sealing ring 302 and contacts the annular protrusion provided at the lower end of the inner side of the middle body 6, preventing the main sealing ring 302 from falling off during installation and serving as a limiting position. The auxiliary seal 4 includes an auxiliary sealing ring 401 and a packing pad 402. The auxiliary sealing ring 401 is disposed at the upper end of the valve stem shoulder 701, and the packing pad 402 is installed on the second positioning part 702 and limits the auxiliary sealing ring 401. The low-leakage packing group 5 is disposed on the packing pad 402 and contacts the lower end of the upper cover 8. The main seal 3, the auxiliary seal 4, and the low-leakage packing group 5 constitute the three-layer seal of this utility model.

[0034] Specifically, the main seal 3, auxiliary seal 4, and low-leakage packing group 5 form a sealing structure between the valve stem 7 and the middle body 6, and are pressed together by the upper cover 8 to form a seal. This structurally changes the valve's sealing structure and quantity, increasing the reliability of the seal. When the valve leaks during use, only this sealing structure needs to be considered, without the need to check other components, thus reducing the workload.

[0035] In this embodiment of the present invention, a guide slope 101 and a detection groove 102 are provided on the valve seat 10 to the right of the O-ring 9. The O-ring 9, the guide slope 101 and the detection groove 102 are located on the pressure-bearing back side of the valve seat 10. When leakage occurs between the valve seat 10 and the valve body 12, the medium will push the O-ring 9 through the guide slope 101 into the detection groove 102. By observing the position of the O-ring 9, it can be determined whether leakage has occurred between the valve seat 10 and the valve body 12.

[0036] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A high-pressure hard-seal ball valve structure, comprising a ball (1), a valve stem (7), a top cover (8), a valve seat (10), and a valve body (12), wherein the valve body (12) is provided with an inlet, an outlet, and a ball (1), and a sealing assembly is provided between the valve body (12) and the valve stem (7), characterized in that: The sealing assembly includes a main seal, an auxiliary seal, and a low-leakage packing assembly (5). The main seal includes a main sealing ring (302) disposed below the valve stem shoulder (701) and a shaft elastic retaining ring (301) that limits the lower part of the main sealing ring (302). The auxiliary seal includes an auxiliary sealing ring (401) disposed above the valve stem shoulder (701) and a packing pad (402) that limits the auxiliary sealing ring (401). The low-leakage packing assembly (5) is located between the upper cover (8) and the packing pad (402), and the lower end of the upper cover (8) extends at least partially into the space between the valve body (12) and the valve stem (7) to press the low-leakage packing assembly (5).

2. The high-pressure hard-seal ball valve structure according to claim 1, characterized in that: The valve body (12) includes a left valve body (121) and a right valve body (122) having an inlet and an outlet respectively, and a middle body (6) disposed between the left and right valve bodies. The middle body (6) is positioned between the upper cover (8) and the ball (1). The lower end of the upper cover (8) extends into the middle body (6) and the valve stem (7) to form a first sealing cavity. The sealing assembly is disposed in the first sealing cavity.

3. The high-pressure hard-seal ball valve structure according to claim 2, characterized in that: The upper cover (8) includes a first positioning part (801) located at its lower end, the first positioning part (801) extending between the middle body (6) and the valve stem (7) and engaging with the middle body (6) in a stepped manner.

4. The high-pressure hard-seal ball valve structure according to claim 2, characterized in that: The valve stem (7) is provided with a second positioning part (702) at its lower end. The main sealing ring (302) and the auxiliary sealing ring (401) are located between the second positioning part (702) and the middle body (6), and the packing pad (402) is steppedly fitted with the second positioning part (702).

5. The high-pressure hard-seal ball valve structure according to claim 4, characterized in that: The valve stem shoulder (701) protrudes from the outer periphery of the second positioning part (702).

6. The high-pressure hard-seal ball valve structure according to claim 2, characterized in that: The lower inner side of the middle body (6) is provided with an annular protrusion, and the lower end of the shaft elastic retaining ring (301) is limited and matched with the annular protrusion.

7. The high-pressure hard-seal ball valve structure according to claim 2, characterized in that: A support plate (2) is provided between the middle body (6) and the sphere (1). The lower end of the support plate (2) is connected to the sphere (1), and the upper end is in close contact with the middle body (6).

8. The high-pressure hard-seal ball valve structure according to claim 1, characterized in that: A second sealing cavity and an O-ring (9) for sealing the second sealing cavity are provided between the valve seat (10) and the valve body (12) near the feed inlet.

9. The high-pressure hard-seal ball valve structure according to claim 8, characterized in that: A detection groove (102) is provided on the side of the O-ring (9) near the ball (1) on the valve seat (10), and the side of the detection groove (102) near the O-ring (9) has a guide slope (101).

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