Pneumatic ball valve can be closed tightly only by 90 degree rotation of air source and small rotating torque with pneumatic actuator. The fully equal valve body cavity provides a small resistance and straight through flow passage for the medium. It is generally considered that ball valve is the most suitable for direct open and closed use. The main feature of ball valve is its compact structure, easy operation and maintenance, suitable for water, solvent, acid and natural gas and other general working media, but also suitable for poor working conditions of media, such as oxygen, hydrogen peroxide, methane and ethylene. The ball valve body can be integral or combined.