Underwater pipeline ball valve

Abstract

An underwater pipeline ball valve comprises a valve body, a valve rod, a valve seat, a valve cover, an upper cover and a spherical valve element connected with the valve rod, the connecting portion of the valve rod and the spherical valve element is in a flat square shape, a flat square groove which is matched with the flat square shape of the valve rod and is communicated with the valve rod is formed in the spherical valve element, and the abutting face of the flat square groove and the valve rod is subjected to surface hardening treatment. The spherical valve element is arranged to be the flat square groove and connected with the valve rod, the connection area between the valve rod and the spherical valve element can be increased, then the extrusion resistance strength of the flat square stress face of the ball body is improved, the situation that opening and closing are not in place due to damage of the ball body is avoided, and the problem that the valve rod is sprayed out of the valve body is solved; and the use safety, the use effect and the service life of the valve are ensured.

Description

Technical Field

[0001] The utility model relates to an underwater pipeline ball valve, belonging to the field of valves. Background Art

[0002] Faced with high-pressure oil and gas exploitation under various complex conditions, the sealing reliability of petroleum equipment is a prerequisite for ensuring the smooth development of oil and gas resources. Considering safety, tightness, reduced maintenance and convenient maintenance, ball valves are widely used in process systems due to their superior sealing performance, compact space structure, and ability to achieve rapid shutoff.

[0003] In recent years, with the improvement of environmental awareness, the control of leakage of fluid equipment has become more stringent, and underwater valves are not allowed to leak under any circumstances. The end flange, middle flange, and bottom cover of underwater ball valves are all static seals with low leakage rates. The upper cover part has become a key area of ​​concern for valve leakage due to the need to install actuator accessories, stem dynamic seals, and complex force on parts. It is very necessary to design an underwater ball valve that can prevent the stem from spraying out under any circumstances and prevent the medium from leaking even if the fasteners fail. Utility Model Content

[0004] The utility model aims to overcome the shortcomings and deficiencies of the prior art and to provide an underwater pipeline ball valve.

[0005] The invention relates to an underwater pipeline ball valve, comprising a valve body, a valve stem, a valve seat, a valve cover, an upper cover and a spherical valve core connected to the valve stem. The connecting portion of the valve stem and the spherical valve core is arranged in a flat square shape. The spherical valve core is provided with a flat square groove which matches the flat square shape of the valve stem and passes through. The abutting surface of the flat square groove and the valve stem is surface hardened. The spherical valve core is arranged as the flat square groove and connected to the valve stem, which can help increase the connection area between the valve stem and the spherical valve core, thereby improving the extrusion strength of the flat square stress-bearing surface of the sphere, solving the problem of inadequate opening and closing caused by damage to the sphere, preventing the valve stem from ejecting from the valve body, and ensuring the safety, use effect and service life of the valve.

[0006] Furthermore, V-shaped openings are provided at both ends of the flat square groove, and the opening angle is between 15-30 degrees. The V-shaped openings increase the operating space when the flat square surface is hardened, and facilitate the entry and exit of tools; the openings have a good guiding effect, reducing the difficulty of assembly between the ball and the valve stem.

[0007] Preferably, the valve body is provided with an anti-flying inner hole, the valve stem includes a sealing portion, the outer wall of the sealing portion is in clearance with the anti-flying inner hole, the outer wall of the sealing portion is provided with a sealing ring groove located below the anti-flying inner hole, and the sealing ring groove is provided with a first O-ring in an uncompressed state. The first O-ring is not compressed when the valve is operating normally, thereby eliminating permanent deformation of the first O-ring after long-term compression. In special circumstances, the upper cover fails, the valve stem moves to the positioning stop of the anti-flying inner hole of the valve body and stops, and the first O-ring contacts and seals with the anti-flying inner hole of the valve body, thereby preventing further expansion of the accident and improving safety.

[0008] Preferably, the upper cover extends into the valve body and abuts against the end face of the valve stem. The abutting end faces of the upper cover and the valve stem are provided with inclined surfaces extending outward, which reduces the contact area between the end face of the valve stem and the upper cover and reduces the friction torque.

[0009] Furthermore, the inclined surface is located at 2 / 3 of the abutting end surface and has an angle of 5° with the horizontal plane, which optimizes the force position of the valve stem end surface and protects the O-ring groove. The position and inclination angle of the inclined surface can be adjusted according to the actual design effect, thereby improving the flexibility of design and manufacturing.

[0010] Preferably, the upper cover is provided with a secondary anti-flying countersunk hole, which is fastened to the valve body by a limiting bolt. After the sealing part of the valve stem is limited by the anti-flying stop of the valve body, the limiting screw limits the upper cover for a second time to prevent the upper cover from flying out.

[0011] Preferably, the valve body includes an inner hole abutting against the sealing part of the valve stem, the abutment between the sealing part and the inner hole is rounded, the inner hole is inclined, the inner hole is tangent to the rounded corner of the sealing part, the rounded corner of the sealing part is sealed with the oblique tangent line, and the sealing pressure ratio is extremely large due to the small contact surface, which compensates for the deviation of the shape tolerance and has excellent effect in short-term emergency sealing state.

[0012] Preferably, the inclination angle of the inner hole is 10°, which is compatible with the rounded corner of the sealing portion and can be flexibly adjusted.

[0013] Furthermore, a connecting plate is provided above the upper cover, and an oil storage tank surrounding the outside of the valve stem is provided on the connecting plate. A second O-ring is provided outside the oil storage tank, and a third O-ring is provided between the upper cover and the connecting plate. All components are located within the grease protection and lubrication range. The oil storage tank ensures effective lubrication of the threads and prevents components from rusting and jamming. The oil film protects the inner surface of the parts, and the valve stem rotates more smoothly.

[0014] Furthermore, a fourth O-ring is provided between the upper cover and the valve body for sealing and preventing leakage.

[0015] The beneficial effects of the utility model are as follows: the spherical valve core is set as a flat square groove and connected to the valve stem, which can help increase the connection area between the valve stem and the spherical valve core, thereby improving the anti-extrusion strength of the flat square stress-bearing surface of the sphere, solving the problem of inadequate switching due to damage to the sphere, preventing the valve stem from ejecting from the valve body, and ensuring the safety, use effect and service life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the valve stem and the spherical valve core in the utility model;

[0019] Figure 3 It is a schematic diagram of the top view of the valve stem and the spherical valve core in the utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the spherical valve core in the utility model;

[0021] Figure 5 for Figure 1 A magnified detail of the center point A;

[0022] Figure 6 It is a schematic diagram of the state after the valve stem moves upward;

[0023] Figure 7 It is a partial structural schematic diagram of the utility model;

[0024] In the figure, 1, valve body; 11, anti-flying inner hole; 12, inner hole; 2, valve stem; 21, sealing part; 22, sealing ring groove; 23, first O-ring; 3, valve seat; 4, valve cover; 5, upper cover; 51, inclined surface; 52, secondary anti-flying countersunk hole; 53, connecting plate; 531, oil storage tank; 54, second O-ring; 55, third O-ring; 56, fourth O-ring; 6, spherical valve core; 61, flat square groove; 62, V-shaped opening. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0026] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0027] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0028] like Figure 1-7 As shown, an embodiment of an underwater pipeline ball valve of the utility model comprises a valve body 1, a valve stem 2, a valve seat 3, a valve cover 4, an upper cover 5 and a spherical valve core 6 connected to the valve stem 2. The connecting portion between the valve stem 2 and the spherical valve core 6 is arranged in a flat square shape. The spherical valve core 6 is provided with a flat square groove 61 which matches the flat square shape of the valve stem 2 and passes through. The abutting surface of the flat square groove 61 and the valve stem 2 is surface hardened. The spherical valve core 6 is arranged as the flat square groove 61 and connected to the valve stem 2, which can help increase the connection area between the valve stem 2 and the spherical valve core 6, thereby improving the anti-extrusion strength of the flat square stress-bearing surface of the sphere, solving the problem of inadequate switching due to damage to the sphere, preventing the valve stem 2 from spraying out of the valve body 1, and ensuring the safety, use effect and service life of the valve.

[0029] V-shaped openings 62 are provided at both ends of the flat square groove 61, and the opening angle is between 15-30 degrees. The V-shaped openings 62 increase the operating space when the flat square surface is hardened, and facilitate the entry and exit of tools; the openings have a good guiding effect, reducing the difficulty of assembling the ball and the valve stem 2.

[0030] The valve body 1 is provided with an anti-flying inner hole 11, and the valve stem 2 includes a sealing portion 21. The outer wall of the sealing portion 21 is in clearance with the anti-flying inner hole 11. The outer wall of the sealing portion 21 is provided with a sealing ring groove 22 located below the anti-flying inner hole 11, and the sealing ring groove 22 is provided with a first O-ring 23 in an uncompressed state. When the valve is working normally, the first O-ring 23 is not compressed, eliminating the permanent deformation of the first O-ring 23 after long-term compression. In special circumstances, the upper cover 5 fails, and the valve stem 2 moves to the positioning stop of the anti-flying inner hole 11 of the valve body 1 and stops. The first O-ring 23 contacts and seals with the anti-flying inner hole 11 of the valve body 1, preventing the accident from further expanding and improving safety.

[0031] The upper cover 5 extends into the valve body 1 and abuts against the end face of the valve stem 2. The abutting end faces of the upper cover 5 and the valve stem 2 are provided with an outwardly extending inclined surface 51, which reduces the contact area between the end face of the valve stem 2 and the upper cover 5 and reduces the friction torque.

[0032] The inclined surface 51 is located at 2 / 3 of the abutting end surface and has an angle of 5° with the horizontal plane, which optimizes the force position of the end surface of the valve stem 2 and protects the O-ring groove. The position and inclination angle of the inclined surface 51 can be adjusted according to the actual design effect to improve the flexibility of design and manufacturing.

[0033] A secondary anti-flying hole 52 is provided on the upper cover 5, and the secondary anti-flying hole 52 is fastened to the valve body 1 through a limiting bolt. After the sealing portion 21 of the valve stem 2 is limited by the anti-flying stop of the valve body 1, the limiting screw limits the upper cover 5 for a secondary time to prevent the upper cover 5 from flying out.

[0034] The valve body 1 includes an inner hole 12 abutting against a sealing portion 21 of the valve stem 2. The abutment between the sealing portion 21 and the inner hole 12 is a rounded corner. The inner hole 12 is arranged at an inclination. The inner hole 12 is tangent to the rounded corner of the sealing portion 21. The rounded corner of the sealing portion 21 is sealed with the oblique tangent line. Due to the small contact surface, the sealing specific pressure is extremely large, which compensates for the deviation of the shape tolerance and has an excellent effect in a short-term emergency sealing state.

[0035] The inclination angle of the inner hole 12 is 10°, which matches the rounded corner of the sealing portion 21 and can be flexibly adjusted.

[0036] A connecting plate 53 is provided above the upper cover 5, and an oil storage groove 531 surrounding the outside of the valve stem 2 is provided on the connecting plate 53. A second O-ring 54 is provided outside the oil storage groove 531, and a third O-ring 55 is provided between the upper cover 5 and the connecting plate 53. All components are located within the grease protection and lubrication range. The oil storage groove 531 ensures effective lubrication of the threads and prevents components from rusting and jamming. The oil film protects the inner surface of the parts, and the valve stem 2 rotates more smoothly.

[0037] A fourth O-ring 56 is provided between the upper cover 5 and the valve body 1 for sealing and preventing leakage.

[0038] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

[0039] Although the present invention has been described with reference to several specific embodiments, it should be understood that the present invention is not limited to the specific embodiments disclosed. The present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. An underwater pipeline ball valve, characterized in that: It includes a valve body, a valve stem, a valve seat, a valve cover, an upper cover and a spherical valve core connected to the valve stem. The connecting part of the valve stem and the spherical valve core is arranged in a flat square shape. The spherical valve core is provided with a flat square groove which matches the flat square shape of the valve stem and passes through. The contact surface between the flat square groove and the valve stem is surface hardened.

2. The underwater pipeline ball valve according to claim 1, characterized in that: Both ends of the flat square groove are provided with V-shaped openings, and the opening angle is between 15-30 degrees.

3. The underwater pipeline ball valve according to claim 1, characterized in that: The valve body is provided with an anti-flying inner hole, the valve stem includes a sealing portion, the outer wall of the sealing portion is gap-matched with the anti-flying inner hole, the outer wall of the sealing portion is provided with a sealing ring groove located below the anti-flying inner hole, and a first O-ring in an uncompressed state is provided in the sealing ring groove.

4. The underwater pipeline ball valve according to claim 1, characterized in that: The upper cover extends into the valve body and abuts against the end surface of the valve stem. The abutting end surface of the upper cover and the valve stem is provided with an inclined surface extending outward.

5. The underwater pipeline ball valve according to claim 4, characterized in that: The inclined surface is located at 2 / 3 of the abutting end surface, and the angle between the inclined surface and the horizontal plane is 5°.

6. The underwater pipeline ball valve according to claim 1, characterized in that: The upper cover is provided with a secondary anti-flying and sinking hole, and the secondary anti-flying and sinking hole is fastened to the valve body through a limiting bolt.

7. The underwater pipeline ball valve according to claim 1, characterized in that: The valve body comprises an inner hole abutting against a sealing portion of the valve stem, the abutment portion between the sealing portion and the inner hole is a rounded corner, the inner hole is arranged obliquely, and the inner hole is tangent to the rounded corner of the sealing portion.

8. The underwater pipeline ball valve according to claim 7, characterized in that: The inclination angle of the inner hole is 10°.

9. The underwater pipeline ball valve according to claim 1, characterized in that: A connecting plate is arranged above the upper cover, an oil storage tank surrounding the outside of the valve stem is arranged on the connecting plate, a second O-ring is arranged outside the oil storage tank, and a third O-ring is arranged between the upper cover and the connecting plate.

10. The underwater pipeline ball valve according to claim 1, characterized in that: A fourth O-ring is provided between the upper cover and the valve body.

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