Ball valve

Abstract

The invention belongs to the technical field of pipeline valves and discloses a ball valve. The ball valve comprises a valve body, a valve ball, a driving shaft, a first inlet valve seat, a first outlet valve seat, a second inlet valve seat and a second outlet valve seat; the first inlet valve seat and the first outlet valve seat are located at the inlet position and the outlet position in the valve body respectively and form normal contact sealing with the valve ball; the second inlet valve seat and the second outlet valve seat are located at the inlet position and the outlet position in the valve body respectively and form selective contact sealing with the valve ball; and when the sealing between the first inlet valve seat and / or the first outlet valve seat and the valve ball fails, the second inlet valve seat and the second outlet valve seat respectively move relative to the valve body and respectively form contact sealing with the valve ball. According to the ball valve provided by the invention, double-seal switching can be achieved, the anti-leakage effect is improved, and the ball valve has the longer service life.

Description

technical field [0001] The invention belongs to the technical field of pipeline valves, and in particular relates to a ball valve. Background technique [0002] The ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. It only needs to rotate 90 degrees and a small rotational torque to close the ball valve tightly. It has the advantages of small fluid resistance and simple structure. . As the opening and closing part of the ball valve, the valve ball is driven by the valve stem and rotates around the axis of the ball valve, which can be used for fluid adjustment and control. [0003] Due to the specific structure of the ball valve, the seal on the valve seat needs to be tightly attached to the valve ball to achieve the sealing of the closed state of the ball valve. However, during the opening and closing process of the ball valve, the rotation of the valve ball will cause friction between the seal and the valve ball, ...

AI Technical Summary

Problems solved by technology

However, during the opening and closing process of the ball valve, the rotation of the valve ball will cause friction between the seal and the valve ball, which will cause wear to the valve ball and the seal after working for a long time, affecting the sealing effect and service life of the ball valve. It is necessary to maintain the ball valve in time. The current maintenance of the ball valve is to remove it from the pipeline. Frequent disassembly and maintenance are not only cumbersome, but also affect the work of the entire system, especially when the pipeline needs to be kept disconnected. When opening, the sudden failure of the sealing of the ball valve will directly affect the normal operation of the entire system, and even cause safety hazards

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