Electric butterfly valve is a butterfly valve matched with electric actuator structure, and can be divided into switch type (providing active and passive feedback signal) and regulating type, it can be controlled through inputting control signal (4~20mA or 0~10VDC) and single-phase power. As it is powerful, light and portable and is superior for its reliable performance, simple matching and strong flow capacity, the valve can be particularly applied to sticky medium with particle and fiber. At present, the electric regulating butterfly valve has been widely applied to automatic control system in industries including food, environmental protection, light industry, petroleum, paper making, chemical engineering, education and scientific research equipment and electricity.