First, use and features: The butterfly valve 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. Second, the use of standards: Design Standards: GB / T12238-1 989 JB / T8692-1998 flange dimensions: GB / T9115.1-2000 length of the structure: GB / T1222.1989 pressure test: GB / T13927-1992; JB / T9092-1999