Air ventilation valve using the same material as the processing and body seals, 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. Main features (1) design, reasonable, unique structure, light weight, open and close quickly. (2) operating torque is small, easy to operate, energy smart. (3) the use of adapted materials to meet the low, medium and high temperatures which different media and corrosive media.