The three-piece pneumatic ball valve only needs to be rotated 90 degrees with air and a small torque can be closed tightly. The completely equal internal cavity of the valve provides a straight flow channel with little resistance for the medium. It is generally believed that the ball valve is most suitable for direct opening and closing. The ball valve has been designed to throttle and control the flow. The main feature of the ball valve is its compact structure, easy operation and maintenance, suitable for general working media such as water, solvent, acid and natural gas, and also suitable for media with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. The ball valve body can be integral or combined.