The electric flanged regulating butterfly valve is composed of a ZKV electric actuator and a three eccentric elastic butterfly valve. It is equipped with an internal private amplifier and can achieve analog signal control of the valve. The butterfly valve adopts a "U" -shaped stainless steel sealing ring. This precise elastic sealing ring makes three-dimensional eccentric contact with the polished butterfly plate. It has solved the problem that the sealing surface of the traditional eccentric butterfly valve is still in sliding contact friction at the moment of opening and closing from 0° to 10°. It achieves the effect that the sealing surface of the butterfly plate separates immediately at the moment of opening and seals immediately upon closing, thus extending the service life and achieving the best sealing performance. Electric flanged regulating butterfly valves are widely used in pipelines of corrosive media such as metallurgy, power, petroleum, chemical industry, air, gas, flammable gas and water supply and drainage where the medium temperature is ≤550℃. They are the best devices for regulating flow and cutting off fluid.