The commonly used pneumatic butterfly valves are wafer type pneumatic butterfly valve and flange type pneumatic butterfly valve. Wafer type pneumatic butterfly valve can only be connected between two pipe flanges with the help of stud bolts. The flange type pneumatic butterfly valve itself has flanges, which can directly connect the flanges on both ends of the valve to the pipe flanges with bolts.

The main features of the pneumatic telescopic butterfly valve are as follows: novel and reasonable design, unique structure, light weight, convenient operation, quick opening and closing; The telescopic butterfly valve can not only adjust and intercept the flow, but also compensate for the expansion and contraction caused by the temperature difference of the pipeline, and also provide convenience for installation, replacement and maintenance of the valve. The sealing part can be adjusted and replaced, and the sealing performance is reliable.