A new type of ball valve opening and closing part and its spherical monoclinic weld seam fully welded ball valve

Abstract

The invention discloses a novel ball valve opening and closing piece. The novel ball valve opening and closing piece comprises two valve seat assemblies, a ball and two valve seat supporting disks. According to the opening and closing piece, by the adoption of the valve seat supporting disks and a cam structure of a valve seat, friction between the ball and the valve seat of a ball valve is avoided in the opening and closing process. The invention further discloses a spherical monoclinic weld joint type all-welded ball valve comprising the novel ball valve opening and closing piece.

Description

technical field [0001] The invention relates to the field of valves, in particular to a novel opening and closing part of a ball valve and a spherical monoclinic fully welded ball valve containing the same. Background technique [0002] After nearly a hundred years of continuous evolution and development, so far, there are two main types of ball valve structures. One is a multi-stage assembled ball valve (two-stage, three-stage). The sections are connected and assembled by bolts, and the sections are sealed by seals to prevent leakage. During use, if leakage occurs, the internal parts can be replaced or repaired by disassembling. The other type is a fully welded ball valve. After assembly, welding and forming, the valve body has no leakage point. During use, if the internal parts are damaged, they cannot be disassembled for maintenance. [0003] At present, there are mainly two types of fully welded ball valves at home and abroad: cylindrical and approximately spherical...

AI Technical Summary

Problems solved by technology

In fact, during the opening and closing process of the existing ball valve, due to the need to rely on the floating valve seat on the upstream and downstream sides under the action of the spring force, the sealing surface of the valve seat is always attached to the surface of the ball and contacted with the initial sealing ratio. Pressure to ensure low-pressure sealing, so that the sealing surface of the valve seat and the surface of the ball are always in contact with friction, so it is easy to be scratched and damaged during long-term operation

The bolted assembled ball valve can be disassembled, repaired or replaced, but not for the fully welded ball valve, so the internal parts (sealing surface) of the existing fully welded ball valve cannot have the same life as the welded valve body

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