Pneumatic butterfly valve is a small and light butterfly valve, which is composed of butterfly valve and pneumatic actuator. Its opening and closing are completed by the round butterfly valve rotating with the valve stem. At present, pneumatic butterfly valves are used to make large diameter in industrial systems. The valve is small in size, light in weight, simple in structure, low in cost, and labor-saving in opening and closing, so its usability is becoming more and more extensive.

Pneumatic butterfly valve and v-type regulating ball valve are mainly used in flue gas desulfurization pipeline system of coal-fired power plant. The characteristics of V-type regulating ball valve and electric butterfly valve will be explained below.
According to the principle of pipe baffle, pneumatic butterfly valve uses an inclined disc (door) as the control element, the disc is fixed on the spindle, and the rotating spindle is used to control the opening and closing. The valve seat can be metal, rubber, Teflon and other materials, and fixed on the valve body wall. This valve is simple in structure. Its valve body is of pancake type, small in mass and small in space. It can be used for throttling, opening and closing. It is especially suitable for controlling large flow, not small flow.