Pneumatic ball valves are used to control the flow of a media (liquid or gas) by means of a rotating ball with a bore. Pneumatic actuators control ball valves by converting compressed air energy to mechanical motion. The rotating ball is controlled and turned by a pneumatic actuator.An air-operated valve, also known as a pneumatic valve, is a type of power-operated pipe valve that uses air pressure to perform a function similar to a solenoid. As air pressure is increased, the compressed air starts to push against the piston or diaphragm walls which causes the valve to actuate.