Plastic butterfly valve has strong corrosion resistance, wide application range, wear resistance, easy disassembly, simple and easy maintenance, applicable fluids: water, air, oil, corrosive chemical liquids, and the valve body structure adopts the center line type. Classification of plastic butterfly valves: handle type plastic butterfly valve, worm wheel type plastic butterfly valve, pneumatic plastic butterfly valve, electric plastic butterfly valve plastic butterfly valve adopts PTFE lined plastic butterfly valve butterfly plate with spherical sealing surface. This valve has light operation, tight sealing performance and long service life; It can be used to quickly cut off or adjust the flow. It is suitable for occasions requiring reliable sealing and good adjustment characteristics. The valve body adopts a split type, and the sealing at both ends of the valve shaft is controlled by adding fluororubber to the rotating base between the butterfly plate and the valve seat; Ensure that the valve shaft does not contact with the fluid medium in the cavity. It is widely applicable to the transportation of liquids and gases (including steam) in various types of industrial pipelines. There are severe corrosive media, such as sulfuric acid, hydrofluoric acid, phosphoric acid, chlorine, strong alkali, aqua regia and other highly corrosive media.