A fully welded ball valve seat structure

Abstract

A fully welded ball valve seat structure, with a one-way sealing valve seat built into the upstream side of the ball and a two-way sealing valve seat built into the downstream side. Sealing rings Ⅰ and triangular rings Ⅰ are respectively embedded in the one-way sealing valve seat, and sealing rings Ⅱ and triangular rings Ⅱ are respectively embedded in the two-way sealing valve seat. The area of the sealing surface formed by the ball and sealing ring Ⅰ is smaller than the area of the sealing surface formed by the ball and sealing ring Ⅱ, and the area of the sealing surface formed by the ball and triangular ring Ⅰ is smaller than the area of the sealing surface formed by the ball and triangular ring Ⅱ. The beneficial effect of the present invention is that, through the difference in the sealing areas of the valve seats on both sides of the ball, the medium accumulated on the upstream side of the ball is more than that on the downstream side, ensuring that it is easier to relieve pressure from the upstream side. The double sealing improves the sealing reliability of the valve.

Description

Technical Field

[0001] The present invention relates to a ball valve, in particular to a seat structure of a fully welded ball valve. Background Art

[0002] Existing domestic fully welded ball valves are mainly applied to low - pound - class long - distance pipeline fields such as natural gas, heating, chemical industry and thermal power pipe networks. However, ultra - high - pressure large - diameter fully welded ball valves applied to oil and gas pipeline construction are mainly ordered from abroad. Their design and manufacturing have certain technical difficulties. Whether it is material performance, technology and process, production manufacturing, or pressure testing, it is a challenge for manufacturers.

[0003] There is only one seal between the sphere and the seat of the existing fully welded ball valve. When the valve is installed on the pipeline and opened and closed for a period of time, there is a possibility of internal leakage of the medium from the seat. At the same time, the medium accumulated on the upstream side of the sphere of the ball valve is more than that on the downstream side, and it is not easy to relieve pressure from the upstream seat. Summary of the Invention

[0004] In order to solve the deficiencies of the prior art, the present invention provides a seat structure of a fully welded ball valve.

[0005] The technical solution of the present invention is a seat structure of a fully welded ball valve, including a sphere, a left valve body, and a right valve body. A one - way seal seat is internally provided on the upstream side of the sphere, and a two - way seal seat is internally provided on the downstream side. Sealing ring Ⅰ and triangular ring Ⅰ are respectively embedded on the one - way seal seat, and sealing ring Ⅱ and triangular ring Ⅱ are respectively embedded on the two - way seal seat. The area of the sealing surface formed by the sphere and sealing ring Ⅰ is smaller than the area of the sealing surface formed by the sphere and sealing ring Ⅱ. The area of the sealing surface formed by the sphere and triangular ring Ⅰ is smaller than the area of the sealing surface formed by the sphere and triangular ring Ⅱ.

[0006] Preferably, grooves for installing an opening retaining ring are provided on the sides of triangular ring Ⅰ and triangular ring Ⅱ. Blind holes for abutting against the bottom end face of the screw are provided on the side of the opening retaining ring facing the sphere side, and the screws are screwed on the left and right valve bodies.

[0007] Preferably, the number of blind holes is 8.

[0008] Preferably, O - ring Ⅰ and O - ring Ⅱ are respectively provided on the one - way and two - way seal seats, and grease injection holes corresponding to the grease injection holes on the left and right valve bodies are provided on the one - way and two - way seal seats between O - ring Ⅰ and O - ring Ⅱ.

[0009] Preferably, O - ring Ⅱ on the one - way seal seat is installed in the groove of the one - way seal seat, and retaining rings are provided on both sides of O - ring Ⅱ on the two - way seal seat and are installed between the outer circle of the two - way seal seat and the inner hole of the right valve body.

[0010] Preferably, two sets of springs are provided on the left and right valve bodies parallel to the channel toroidal surface. Spring I is arranged near the tail of the single and double-direction sealing valve seat parallel to sealing rings I and II, and Spring II is arranged on the side of the single and double-direction sealing valve seat where triangular rings I and II are installed.

[0011] Preferably, threaded holes are provided on the inner hole end surfaces of the upper parts of the single and double-direction sealing valve seats of the left and right valve bodies facing the sphere direction.

[0012] The beneficial effect of the present invention is that, through the difference in the sealing areas of the valve seats on both sides of the sphere, the medium accumulated on the upstream side of the sphere is more than that on the downstream side, ensuring that pressure relief is easier from the upstream side.

[0013] The double sealing of the sphere with the sealing ring and the triangular ring improves the sealing reliability of the valve; the selection of the second sealing triangular ring ensures the safety performance of the valve.

[0014] By designing two sets of springs on the left and right valve bodies parallel to the channel toroidal surface, the force on the double-sealing valve seat is made more uniform and stable, improving the sealing reliability.

[0015] Through the threaded holes designed on the left and right valve bodies, and then using the baffle plate, the installation of the valve is made more convenient, the working efficiency is improved, and the manufacturing cost is reduced. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of a single-direction sealing valve seat;

[0017] Figure 2 is a schematic structural diagram of a double-direction sealing valve seat;

[0018] Figure 3 is Figure 1 a partial enlarged view at A in

[0019] Figure 4 is a schematic structural diagram of a snap ring.

[0020] In the figure: 1. Sphere; 2. Left valve body; 3. Single-direction sealing valve seat; 4. Sealing ring I; 5. Triangular ring I; 6. O-ring I; 7. O-ring II; 8. Grease injection hole; 9. Spring I; 10. Spring II; 11. Threaded hole; 12. Baffle plate; 13. Double-direction sealing valve seat; 14. Right valve body; 15. Sealing ring II; 16. Triangular ring II; 17. Retaining ring; 18. Snap ring; 19. Screw; 20. Blind hole. Detailed Embodiments

[0021] As shown in the figure, a fully welded ball valve seat structure includes a ball 1, a left valve body 2, and a right valve body 14. A one-way seal seat 3 is built into the upstream side of the ball 1, and a two-way seal seat 13 is built into the downstream side. Sealing rings I 4 and triangular rings I 5 are respectively embedded in the one-way seal seat 3, and sealing rings II 15 and triangular rings II 16 are respectively embedded in the two-way seal seat 13. The area of the sealing surface formed by the ball 1 and the sealing ring I 4 is smaller than the area of the sealing surface formed by the ball 1 and the sealing ring II 15, and the area of the sealing surface formed by the ball 1 and the triangular ring I 5 is smaller than the area of the sealing surface formed by the ball 1 and the triangular ring II 16. Through the first seal formed by the sealing ring I 4, the sealing ring II 15 and the ball 1, and the second seal formed by the triangular ring I 5, the triangular ring II 16 and the ball 1, the double seal ensures the reliability of the valve seal; at the same time, when the valve cavity pressure rises abnormally, due to the area difference, more medium accumulates on the upstream side of the ball 1 than on the downstream side, making it easier to relieve pressure from the upstream side.

[0022] Grooves for installing an opening retaining ring 18 are provided on the sides of the triangular ring I 5 and the triangular ring II 16. A blind hole 20 is provided on the side of the opening retaining ring 18 facing the ball 1, which abuts against the bottom end face of the screw 19. The screw 19 is screwed on the left valve body 2 and the right valve body 14. This ensures that the triangular ring I 5 and the triangular ring II 16 are pressed tightly and prevents the opening retaining ring 18 from shaking when the ball 1 opens and closes, guaranteeing the stiffness integrity of the entire valve seat structure.

[0023] O-ring I 6 and O-ring II 7 are respectively provided on the one-way seal seat 3 and the two-way seal seat 13. On the one-way seal seat 3 and the two-way seal seat 13 between the O-ring I 6 and the O-ring II 7, grease injection holes 8 corresponding to the grease injection holes 8 on the left valve body 2 and the right valve body 14 are provided. Grease injection through the grease injection holes 8 realizes the temporary requirement of on-line emergency sealing of the valve.

[0024] The O-ring II 7 on the one-way seal seat 3 is installed in the groove of the one-way seal seat 3, ensuring that the abnormally increased pressure in the valve cavity can push the one-way seal seat 3 to move for self-pressure relief. On both sides of the O-ring II 7 on the two-way seal seat 13, retaining rings 17 are provided and installed between the outer circle of the two-way seal seat 13 and the inner hole of the right valve body 14. When the valve cavity medium pressure rises abnormally, only the O-ring II 7 can be pushed towards the valve body 1, and the medium in the middle cavity can be intercepted in the valve cavity to realize the double isolation and evacuation function.

[0025] Two groups of springs are provided on the left valve body 2 and the right valve body 14 on the plane parallel to the channel. The spring I 9 is arranged at the tail of the one-way seal seat 3 and the two-way seal seat 13 close to being parallel to the sealing ring I 4 and the sealing ring II 15, and the spring II 10 is arranged on the sides of the one-way seal seat 3 and the two-way seal seat 13 where the triangular ring I 5 and the triangular ring II 16 are installed. Through the two groups of springs, the seats of the double seal are more evenly and smoothly stressed, improving the sealing reliability.

[0026] Threaded holes 11 are provided on the inner hole end faces of the one-way seal valve seats 3 facing the sphere 1 of the left valve body 2 and the upper parts of the two-way seal valve seats 13. After the two side valve seat assemblies are installed in the left valve body 2 and the right valve body 14, the two side valve seat groups are fastened to the left valve body 2 and the right valve body 14 through the threaded holes 11, fasteners and the baffle 12, so as to prevent them from slipping from the inner holes of the left valve body 2 and the right valve body during the installation process, making the installation more convenient.

[0027] This specific embodiment is only an interpretation of the present invention and is not a limitation thereof. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A fully welded ball valve seat structure, comprising a ball, a left valve body, and a right valve body, characterized in that, A one-way seal valve seat is built into the upstream side of the sphere, and a two-way seal valve seat is built into the downstream side. Sealing ring I and triangular ring I are respectively embedded on the one-way seal valve seat. Sealing ring II and triangular ring II are respectively embedded on the two-way seal valve seat. The area of the sealing surface formed by the sphere and sealing ring I is smaller than the area of the sealing surface formed by the sphere and sealing ring II. The area of the sealing surface formed by the sphere and triangular ring I is smaller than the area of the sealing surface formed by the sphere and triangular ring II.

2. The seat structure of an all-welded ball valve according to claim 1, characterized in that, Grooves for installing snap rings are provided on the sides of triangular ring I and triangular ring II. Blind holes that abut against the bottom end face of the screw are provided on the side of the snap ring facing the sphere. The screw is screwed onto the left and right valve bodies.

3. The seat structure of a fully welded ball valve according to claim 2, characterized in that, The number of the blind holes is 8.

4. A seat structure of a fully welded ball valve according to claim 1, characterized in that, O-ring I and O-ring II are respectively provided on the one-way and two-way seal valve seats. Grease injection holes corresponding to the grease injection holes on the left and right valve bodies are provided on the one-way and two-way seal valve seats between O-ring I and O-ring II.

5. A seat structure of a fully welded ball valve according to claim 4, characterized in that, O-ring II on the one-way seal valve seat is installed in the groove of the one-way seal valve seat. Retaining rings are provided on both sides of O-ring II on the two-way seal valve seat and are installed on the outer circle of the two-way seal valve seat and the inner hole of the right valve body.

6. The seat structure of a fully welded ball valve according to claim 1, wherein Two groups of springs are provided on the left and right valve bodies on the toroidal surface parallel to the channel. The two groups of springs include spring I and spring II. Spring I is arranged near the tails of the one-way and two-way seal valve seats parallel to sealing ring I and sealing ring II. Spring II is arranged on the sides of the one-way and two-way seal valve seats where triangular ring I and triangular ring II are installed.

7. The seat structure of a fully welded ball valve according to claim 6, characterized in that, Threaded holes are provided on the inner hole end faces of the upper parts of the one-way and two-way seal valve seats of the left and right valve bodies facing the sphere.

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