The butterfly valve with low mechanical wear, excellent flow function, widely used in metallurgy, chemical, oil, electricity, food, medicine, water and other gas transportation pipeline for regulating the flow of different media, cut off or connected fluid best devices. Choice of different materials, can be separately applied to water, sewage, water, air, steam, gas, flammable gas, corrosive media, oil and food and other media. It can be electric, electronic and pneumatic actuator supporting the use of