Electric ventilation butterfly style dish using new forms of midline structural steel plate and short design and manufacture of welded structure, compact, light weight, easy to install, low flow resistance, high turnover, avoid high temperature expansion effects, easy operation. Uses and characteristics of the valve body using the same material as the processing and seals, using electric or pneumatic drive. Their body temperature with suitable selection may be, nominal ≤0.6MPa, generally applicable to industry, metallurgy, environmental protection, ventilation pipes for adjusting the flow of the medium. Its main features are: 1, novel design, reasonable, unique structure, light weight, open and close quickly. 2, the operation torque is small, easy to operate, energy smart. 3, using materials adapted to meet the low, medium and high temperatures which different media and corrosive media.