This valve is a rubber (NBR) sealed butterfly valve widely used in water supply and drainage pipeline systems in electric power, hydraulic, metallurgy, chemical, urban construction and other industries. It is a new type of connecting valve designed and manufactured by introducing similar advanced products from the United States and Germany. It has the advantages of quick and easy installation, safe and unrestricted by the installation site, convenient for maintenance of pipelines and valves, vibration isolation and sound insulation, and overcomes the deviation caused by the coaxial connection of pipelines within a certain angle range. Solve the advantages of thermal expansion and contraction caused by temperature difference.