High-pressure ball valve sealed by inflatable type flexible sealing rings arranged inside valve seats

Abstract

The invention discloses a high-pressure ball valve sealed by inflatable type flexible sealing rings arranged inside valve seats. The high-pressure ball valve comprises valve covers, a valve body, a supporting shaft, a ball body, end covers, the valve seats, the inflatable type flexible sealing rings, a valve rod, a stuffing box, fillers and a gland; an inner ring sealing sphere of each valve seat clings to the surface of the ball body to form a first sealing structure; each inflatable type flexible sealing ring inflated at an annular opening clings to the surface of the ball body to form a second sealing structure. According to the high-pressure ball valve sealed by inflatable type flexible sealing rings arranged inside valve seats, by controlling the inflation of the inflatable type flexible sealing rings, construction and elimination of the second sealing structure can be realized; abrasion of a sealing surface between the valve seats and the ball body, caused by rotation of the ball body, can be greatly reduced; meanwhile, the sealing surface of each valve seat is ensured to always cling to the sphere completely to guarantee the sealing effect.

Description

technical field [0001] The invention relates to the technical field of ball valves, in particular to a high-pressure inflatable flexible sealing ring-sealed ball valve with a built-in valve seat. Background technique [0002] As we all know, at home and abroad, the fixed ball valve generally adopts the sealing structure of the floating valve seat, that is, the ball (valve core) is fixed, the valve seat is floating, and the valve seat relies on the elastic force generated by the spring placed on the end face and the pressure of the medium. The seat is pushed tightly against the ball to establish the specific pressure of the seal. [0003] Generally speaking, valve designers hope to reduce or completely eliminate the gap between the sealing surface of the valve seat and the outer surface of the ball as much as possible, so as to reduce the leakage risk of the valve. [0004] At present, there are mainly three structural types of the sealing structure between the valve seat an...

AI Technical Summary

Problems solved by technology

[0008] Usually, during the opening and closing process of the valve, the ball rotates, and the sealing surface of the valve seat and the spherical surface that are always close together are worn under the action of spring force and medium pressure; after a long or short period of time, when the wear After reaching a certain level, the valve will leak, and eventually the valve will fail due to excessive leakage

[0009] However, it is obvious that the sealing surfaces of the valve seat and the sphere of the above-mentioned 3 main types of sealing structures will be worn due to the rotation of the valve sphere, so the traditional ball valves installed with the above-mentioned 3 types of sealing structures are prone to wear and leakage. defect

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