Electric butterfly valve industrial pipe used most commonly used variety of valves. Butterfly valve has the advantages of small size, less material consumption, light weight, the larger diameter relative to the other valve is more economical. Pneumatic actuator can be rapidly rotating 90 °headstock, simple operation. At the same time, the fluid control valve has good characteristics. Butterfly valve in the fully open position, the butterfly plate thickness is the only medium through the valve body when the resistance, through the valve so the pressure drop is very small, when opening at approximately 15 °to 70°, and the sensitivity of flow control, therefore large caliber flow regulation, the butterfly valve has a larger advantage. Is not suitable for particles and the high temperature process medium.