Electric flange type telescopic butterfly valve is suitable for regulating the flow and interception medium on the water supply and drainage and gas pipelines such as water supply and drainage and gas pipelines with a temperature ≤ 80 °C and a nominal pressure ≤of 1.6MPa, and has the function of compensating for the thermal expansion and contraction of the pipeline. Its main features are: novel design, reasonable, unique structure, light weight, convenient operation, fast opening and closing; In addition to adjusting and intercepting the flow and compensating for the thermal expansion and contraction caused by the temperature difference of the pipeline, the telescopic butterfly valve can also provide convenience for installation, replacement and maintenance; The sealing part can be adjusted and replaced, and the sealing performance is reliable.