Pneumatic plastic butterfly valve has light weight and strong corrosion resistance. It has been applied in many fields, such as general pure water and domestic drinking water pipeline system, drainage and sewage pipeline system, salt water and sea water pipeline system, acid-base and chemical solution system, and its quality has been recognized by the majority of users. Compact and beautiful appearance, light weight, easy installation, strong corrosion resistance, wide application range, hygienic material, non-toxic, wear-resistant, easy disassembly, simple and easy maintenance