Pneumatic flange ball valve only need to rotate 90 degrees of operation and a small torque can be closed tightly. The completely equal body cavity provides the medium with little resistance and a straight flow path. Ball valves are generally considered to be most suitable for direct opening and closing use, but recent developments have designed ball valves to provide throttling and flow control. The main feature of the ball valve is its compact structure, easy operation and maintenance, suitable for water, solvents, acids and natural gas and other general working media, but also suitable for poor working conditions of the media, such as oxygen, hydrogen peroxide, methane and ethylene. Ball valve body can be integral, can also be combined.