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The pneumatic ball valve can be tightly closed only by the operation of rotating 90 degrees with the pneumatic actuator and gas source and with very small rotational torque. The completely equal valve body cavity provides a flow passage with little resistance and straight through for the medium. Generally, it is considered that the ball valve is most suitable for direct opening and closing. The main characteristics of the ball valve are its compact structure, easy operation and maintenance. It is suitable for general working media such as water, solvents, acids and natural gas, and also suitable for media with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. The valve body of the ball valve can be integral or modular.