The electric ventilation butterfly valve is a kind of non airtight butterfly valve, which is widely used in the production process of building materials, metallurgy, mining, electric power, etc. the medium temperature is ≤ 300 ℃ and the nominal pressure is 0.1MPa. It is used to connect, open and close or adjust the medium quality. The electric ventilation butterfly valve is mainly used in the dust containing cold air or hot air gas pipeline of the ventilation and environmental protection engineering in the industries of gold, chemical industry, building materials, power station, glass, etc., as the gas medium to regulate the flow or cut off the device. The electric ventilation butterfly valve is designed and manufactured with a new type of structure, which is welded by the central line type disc plate and the short structure steel plate. It is compact in structure, light in weight, easy to install, small in flow resistance and large in flow volume, avoiding the influence of high temperature expansion, and easy to operate. There is no connecting rod and bolt in the body. The ventilation butterfly valve works reliably and has a long service life. It can be installed in multiple stations, not affected by the flow direction of media.