D941 electric flange type ventilation butterfly valve is processed into a sealing ring using the same material as the valve body, and adopts electric or pneumatic transmission. Its applicable temperature is determined by the selection of the valve body, and the nominal pressure ≤ 0.6MPa. It is generally suitable for industrial, metallurgy, environmental protection and other pipelines for ventilation and adjustment of medium flow. Its main features are: novel design, reasonable, innovative structure, light weight, fast opening and closing. Small operation, easy to operate, labor-saving and dexterous. Suitable materials are used to meet low, medium and high media temperatures, and corrosive media.