The three-stage high-pressure flange ball valve produced and sold by Huadian Pump Valve Company has a rotation of 90 degrees, the stopcock body is a sphere, and there is a round through hole or channel through its axis. This type of ball valve is mainly used to cut, distribute and change the flow direction of the medium in the pipeline, and it only needs to rotate 90 degrees of operation and a small turning torque to close tightly. Ball valves are best suited for on/off and shut-off valves, but recent developments have designed ball valves to throttle and control flow