The ball valve in the top industrial valves is the most widely used. The ball valve has the action of rotating 90 degrees. The plug body is a sphere, and has a circular through hole or passage through the axis. In the pipeline, the ball valve is mainly used for blocking, distributing and changing the direction of movement of the medium. It only needs to be closed tightly with a 90 degree rotation and a small rolling moment. The ball valve is the most suitable for use as a switch or block valve.