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Ball valve is a valve driven by the stem to open and close (ball), and around the axis of the valve stem for rotary movement. It is mainly used to cut off or connect the medium in the pipeline, and can also be used for fluid regulation and control. The ball valve is evolved from the plug valve. The function of the ball valve is to use the ball to rotate 90 ° around the axis of the valve stem to open and close the valve.

Ball valve is mainly used for opening and closing pipeline and equipment medium. Its compact structure, reliable sealing, simple structure, relatively small size, light weight, convenient maintenance, no vibration, low noise. Sealing surface and spherical surface are often in closed state, not easy to be eroded by medium, easy to operate and maintain, suitable for water, solvent, acid, natural gas and other working media, but also suitable for working conditions of bad media, such as oxygen, peroxide h, methane and ethylene, etc., which are widely used in various industries. The ball valve body can be integral (one-piece) or combined (two-piece and three-piece).