PTFE seat Stainless Steel Lug butterfly valve Widely used in metallurgy, chemical industry, building materials, power station, glass and other industries in the ventilation, environmental protection engineering of dust-containing cold air or hot air gas pipeline, as a gas medium to regulate the flow or cut off device usually by the angle-stroke electric actuator (0 ~ 90 ° part of the rotary) and butterfly valve as a whole through mechanical connection, after installation and commissioning together.