It is generally believed that pneumatic ball valves are most suitable for direct opening and closing, but recent development has designed pneumatic ball valves to be used for throttling and flow control. The main characteristics of pneumatic ball valve are its compact structure, easy operation and maintenance, and suitable for general working media such as water, solvent, acid and natural gas, and also suitable for media with poor working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. The valve body of the pneumatic ball valve can be integral or combined.

4. FO and FC of pneumatic control valve
There are two types of action of pneumatic control valve: air to open and air to close.