Top-mounted soft seal floating ball valve
By introducing the V-angle structure and the floating design of the rubber seal ring into the valve seat design, the seal leakage problem caused by gravity deformation of the seal ring is solved, and the reliability and consistency of sealing performance is achieved.
Patent Information
- Application Number
- CN202521266874.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-20
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2035-06-20
AI Technical Summary
The sealing ring of the existing soft seal floating ball valve is deformed by the gravity of the ball during long-term use, resulting in the sealing force between the upper part of the sealing ring and the ball being less than the lower part, causing the sealing leakage.
The valve seat is designed to consist of a rubber sealing ring and a valve seat mounting seat, which is movably installed in the valve seat mounting cavity. When the valve seat is under pressure from the ball, it can be attached to the surface of the ball floating to ensure that the sealing ring fits with the surface of the ball, and a V-shaped angular structure is formed in the valve seat mounting cavity to maintain the uniform sealing pressure.
Through the V-angle structure and the floating design of the rubber seal ring, the sealing ring is prevented from deformation, maintaining the uniform sealing pressure, and improving sealing performance and reliability.
Smart Images
Figure CN223152856U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of valves, and particularly relates to a top-mounted soft-sealed floating ball valve. Background Art
[0002] The structure of a top-mounted soft-sealed floating ball valve includes a valve body, a valve seat, a valve cover, and a valve stem. The valve cover is installed in the middle cavity of the valve body. The sealing surface of the valve seat adopts a soft-sealed structure and is installed in the inlet and outlet channels of the valve body through the middle cavity. The ball is floatingly installed in the valve cavity through the middle cavity, and the main components in the inner cavity of the valve body such as the ball and the valve seat can be replaced online, which has the advantages of simple structure and convenient maintenance. However, for the soft-sealed floating ball valve, during use, its sealing ring is long-term affected by the gravity of the ball, resulting in deformation of the sealing ring, so that the sealing force between the upper part of the sealing ring and the ball is less than the sealing force between the lower part of the sealing ring and the ball, that is, the sealing specific pressure of the upper part of the sealing pair is less than the sealing specific pressure of the lower part of the sealing pair, causing sealing leakage. Summary of the Utility Model
[0003] Aiming at the problems existing in the prior art, the utility model provides a top-mounted soft-sealed floating ball valve in which the sealing ring can axially float along with the valve stem under the pressure of the ball, ensuring that the sealing ring fits the surface of the ball and having good sealing performance.
[0004] The technical solution of the utility model is as follows:
[0005] A top-mounted soft-sealed floating ball valve includes a valve body, a valve seat, a valve cover, a ball, and a valve stem. The valve body has an inlet channel, an outlet channel, and a middle cavity mounting port communicating with the valve cavity. The valve cover is installed at the upper end of the middle cavity mounting port. The ball is floatingly installed in the valve cavity, and its spherical surface cooperates with the inlet-side valve seat and the outlet-side valve seat to form an inlet sealing pair and an outlet sealing pair. The upper end of the ball is connected to the lower end of the valve stem, and the upper end of the valve stem passes through the valve cover and is connected to the transmission device. A radial shoulder to prevent ejection is provided between the valve stem and the inner step of the axial hole at the lower end face of the valve cover; its feature is that valve seat mounting cavities surrounding the inlet channel and the outlet channel are respectively provided in the valve cavity. The valve seat mounting cavity is a U-shaped structure, and the two-side valve seat mounting cavities form a V-shaped angle; the valve seat is composed of a rubber sealing ring and a valve seat mounting seat. The rubber sealing ring has a through hole with the same diameter as the inlet and outlet channels of the valve body, and its outer ring surface is embedded in the inner hole of the valve seat mounting seat. The sealing surface has a curved surface that cooperates with the sealing surface of the ball. The sealing surface of the ball forms a V-shaped angle same as that of the two-side valve seat mounting cavities along the rotation center line direction of the ball. The outer periphery of the valve seat mounting seat has a U-shaped structure that cooperates with the valve seat mounting cavity and is movably embedded in the valve seat mounting cavity.
[0006] In the above technical solution, the angle of the V-shaped angle between the two-side valve seat mounting cavities is 5°, and the angle of the V-shaped angle of the sealing surface of the ball along the rotation center line direction of the ball is 5°.
[0007] In the above technical solution, a compression spring is arranged between the lower annular surface of the anti-knock radial shoulder and the upper end surface of the sphere.
[0008] The beneficial effects of the present utility model compared with the prior art are that the valve seat is composed of a rubber sealing ring and a valve seat mounting seat, and is movably installed in the valve seat mounting cavity. When the valve seat is subjected to the pressure of the sphere, it can be integrally attached to the surface of the sphere and float in the direction of the valve rod center line, preventing the rubber sealing ring of the valve seat from being under long-term pressure, resulting in the sealing specific pressure of the upper part of the sealing pair being less than that of the lower part of the sealing pair, maintaining the same circumferential sealing specific pressure of the sealing pair, and having reliable sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 is a schematic structural diagram of the present utility model.
[0010] Figure 2 is the present utility model Figure 1 a schematic structural diagram of the valve body in.
[0011] Figure 3 is the present utility model Figure 2 a schematic structural diagram in the A-A direction in.
[0012] In the figure: 1 valve body, 2 valve seat, 3 inlet passage, 4 valve cover, 5 sphere, 6 compression spring, 7 anti-knock radial shoulder, 8 valve rod, 9 middle cavity mounting port, 10 outlet passage, 11 valve cavity, 12 valve seat mounting cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0013] As Figure 1 shown, the top-mounted soft-sealed floating ball valve includes a valve body 1, a valve seat 2, a valve cover 4, a sphere 5, and a valve rod 8. The valve body 1 has an inlet passage 3, an outlet passage 10, and a middle cavity mounting port 9 communicating with the valve cavity 11. The valve seat 2 and the sphere 5 can be placed into or taken out of the valve cavity 11 through the middle cavity mounting port 9. The valve cover 4 is installed at the upper end of the middle cavity mounting port 9 to achieve the sealing of the middle cavity of the valve body 1. The sphere 5 is floatingly installed in the valve cavity 11, and its spherical surface cooperates with the inlet-side valve seat and the outlet-side valve seat to form an inlet sealing pair and an outlet sealing pair. The upper end of the sphere 5 is connected to the lower end of the valve rod 8, and the upper end of the valve rod 8 passes through the valve cover 4 and is connected to the transmission device. The transmission device drives the sphere 5 to rotate 90° through the valve rod 8 to achieve the opening and closing operation. An anti-knock radial shoulder 7 is arranged between the valve rod 8 and the inner step of the shaft hole at the lower end surface of the valve cover 4 to prevent the valve rod 8 from being knocked out of the shaft hole of the valve cover 4 by the medium pressure; its characteristics are: valve seat mounting cavities 12 are respectively arranged around the inlet passage 3 and the outlet passage 10 in the valve cavity 11. The valve seat mounting cavity 12 is a U-shaped structure, that is, the lower part of the valve seat mounting cavity 12 is a semi-circular arc concave cavity concentric with the inlet passage 3 and the outlet passage 10, and the upper part is a rectangular structure concave cavity with the same width as the diameter of the semi-circular arc concave cavity. As Figure 3 shown, the two-side valve seat mounting cavities 12 form a V-shaped angle with the axis of the valve rod 8 as the center line. AsFigure 2 As shown in the figure; the valve seat 2 is composed of a rubber sealing ring and a valve seat mounting seat. The rubber sealing ring has a through hole with the same diameter as the inlet and outlet channels of the valve body 1. The outer ring surface of the rubber sealing ring is embedded in the inner hole of the valve seat mounting seat. Its sealing surface has a curved surface that cooperates with the sealing surface of the sphere 5. The sealing surface of the sphere 5 forms a V-shaped angle identical to that of the two-side valve seat mounting cavities 12 along the rotation center line direction of the sphere 5, that is, the cross-section on both sides of the sealing surface of the sphere 5 in the plane where the center line of the channel of the valve body 1 and the center line of the valve rod 8 are located forms a V-shaped angle identical to that of the two-side valve seat mounting cavities 12. The outer periphery of the valve seat mounting seat has a U-shaped structure that cooperates with the valve seat mounting cavity 12 and is movably embedded in the valve seat mounting cavity 12, enabling the valve seat 2 to float along the center line direction of the valve rod 8 in the valve seat mounting cavity 12. When the valve seat 2 is subjected to the weight of the sphere 5, the valve seat 2 fits and floats on the surface of the sphere 5, preventing the sealing surface of the valve seat from being deformed under pressure and ensuring that the circumferential sealing specific pressure of the sealing pair is consistent, thereby improving the sealing performance. The radial outer step on the back of the rubber sealing ring is press-fitted on the inner step of the valve seat mounting seat. The annular end surface inside the radial outer step is in tight sealing cooperation with the valve seat mounting cavity 12, achieving the sealing between the valve seat 2 and the valve body 1. The sealing between the valve seat 2 and the valve body 1 can also be achieved by the tight sealing cooperation between the end surface of the valve seat mounting seat and the valve seat mounting cavity 12.
[0014] The optimal value of the angle of the V-shaped angle between the two-side valve seat mounting cavities 12 is 5°.
[0015] A compression spring 6 is arranged between the lower ring surface of the anti-knock-out radial shoulder 7 and the upper end surface of the sphere 5 to push the sphere 5 and the valve seat 2 to be wedged tightly for sealing cooperation, preventing the sphere 5 from moving upward under the action of fluid pressure and improving the sealing performance between the sphere 5 and the valve seat 2 and between the valve seat 2 and the valve seat mounting cavity 12.
[0016] A nickel-based alloy material is surfacing-welded on the sealing part of the valve body 1 and is precision machined to form a mirror sealing surface, as Figure 2 shown, to improve wear resistance, corrosion resistance and sealing performance.
Claims
1. An upper-mounted soft-sealed floating ball valve, comprising a valve body (1), a valve seat (2), a valve cover (4), a ball (5), and a valve stem (8). The valve body (1) has an inlet passage (3), an outlet passage (10), and a middle cavity mounting port (9) that communicate with the valve cavity (11). The valve cover (4) is installed at the upper end of the middle cavity mounting port (9). The ball (5) is floatingly installed in the valve cavity (11), and its spherical surface cooperates with the inlet-side valve seat and the outlet-side valve seat to form an inlet seal pair and an outlet seal pair. The upper end of the ball (5) is connected to the lower end of the valve stem (8). The upper end of the valve stem (8) passes through the valve cover (4) and is connected to the transmission device. An anti-knock radial shoulder (7) is provided between the valve stem (8) and the inner step of the shaft hole on the lower end surface of the valve cover (4); The feature is that: In the valve cavity (11), valve seat mounting cavities (12) are respectively arranged around the inlet passage (3) and the outlet passage (10). The valve seat mounting cavity (12) is of a U-shaped structure, and the two-sided valve seat mounting cavities (12) form a V-shaped angle with the axis of the valve stem (8) as the center line; the valve seat (2) is composed of a rubber sealing ring and a valve seat mounting seat. The rubber sealing ring has a through hole with the same diameter as the inlet and outlet passages of the valve body (1). The outer ring surface thereof is embedded in the inner hole of the valve seat mounting seat, and its sealing surface has a curved surface that cooperates with the sealing surface of the sphere (5). The outer periphery of the valve seat mounting seat has a U-shaped structure that cooperates with the valve seat mounting cavity (12) and is movably embedded in the valve seat mounting cavity (12).
2. The top-mounted soft-sealing floating ball valve according to claim 1, characterized in that: The optimal value of the angle of the V-shaped angle between the two-sided valve seat mounting cavities (12) is 5º.
3. The top-mounted soft-sealed floating ball valve according to claim 2, characterized in that: A compression spring (6) is arranged between the lower ring surface of the anti-knock-out radial shoulder (7) and the upper end surface of the sphere (5).
4. The top-mounted soft-sealed floating ball valve according to claim 1 or 2 or 3, characterized in that: A nickel-based alloy material is surfacing-welded at the sealing part of the valve body (1), and a mirror sealing surface is formed by precision machining.