Ball valve with circular arc transition-type anti-erosion seal valve seat

Abstract

The invention discloses a ball valve with a circular arc transition-type anti-erosion seal valve seat. The ball valve comprises a drive mechanism, a valve body, a ball body and two valve seats with the same structure, wherein the ball body in the valve body is driven to rotate by the drive mechanism through a valve rod; the valve seats are arranged at a fluid inlet and a fluid outlet; each valve seat is provided with circular arc transition-type anti-erosion seal; an outer cylinder of the valve seat is in a step ring-shaped structure; the contact part of a big end and the ball body is in an arc surface; the middle part of the arc surface is provided with a layer of ring-shaped seal surface; the inner surface of the valve seat is provided with a circular arc transitional surface of the valve seat, wherein the diameter of one end of the circular arc transitional surface, close to the ball body, is small, and the diameter of one end of the circular arc transitional surface, far away from the ball body, is big; a ring-shaped groove is arranged on a connecting part of the circular arc surface at the contact part of the valve seat and the ball body as well as a small end of the inner surface of the valve seat; the outer ring of a big end of the valve seat is provided with a seal ring clamp groove; and a pretightening force spring is arranged in the spring clamp groove on a shoulder side of the valve seat. With the adoption of the ball valve with the circular arc transition-type anti-erosion seal valve seat, erosion corrosion of a medium to the ball body is prevented; the pretightening force between the valve seat and the ball body is increased because of the height difference generated by a circular arc inclination angle, and the ball valve seal performance is improved.

Description

technical field [0001] The invention relates to a ball valve, in particular to a ball valve with a circular arc transition anti-erosion sealing valve seat. Background technique [0002] The ball valve is evolved from the plug valve. Its opening and closing part is a sphere, and the sphere is rotated 90° around the axis of the valve stem to achieve the purpose of opening and closing. The ball valve is not only simple in structure and good in sealing performance, but also has the advantages of small size, light weight, less material consumption, small installation size, small driving torque, easy operation, and easy quick opening and closing within a certain nominal size range. One of the fastest growing valve varieties in the past ten years. [0003] The use of ball valves is very extensive, and the variety and quantity of use are still expanding, and they are developing in the direction of high temperature, high pressure, large diameter, high sealing, long life, excellent a...

AI Technical Summary

Problems solved by technology

In the traditional valve industry, the sealing reliability of ball valves mainly depends on the fit between the geometric structure of the valve seat and the ball, as well as the spring or packing to provide pretightening force, but in the case of large flow granular media, the scouring force is very large , this kind of preloading device is difficult to achieve the corresponding preloading effect, which has a certain impact on the sealing reliability of the valve

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