This valve is a rubber sealing butterfly valve, which is widely used in the water supply and drainage pipeline systems of water supply and drainage, sewage, power generation, petroleum, chemical industry, light textile, food and other industries as an opening and closing or regulating device to control the medium flow. The valve body is lined with rubber and the center line of the butterfly plate is adopted, which can be sealed in both directions, with reliable sealing and long service life; The butterfly plate is reasonably designed with small flow resistance. Small pressure loss; The overall dimension is convenient for installation. Electric butterfly valve adopts electric device, which is easy to open; Pneumatic butterfly valve adopts pneumatic actuator, with large output torque and light opening.