JL600-D2 pneumatic triple eccentric butterfly valve is widely used in metallurgy, electric power, petrochemical industry, producer, gas, steam, natural gas, city gas, cold and hot air, chemical smelting engineering and power generation environmental protection system with medium temperature ≤ 425℃. Various corrosive and non-corrosive fluid media and industrial pipelines such as water supply and drainage and municipal construction are used for adjusting flow and carrying and breaking fluid. Conventional application areas of hard-sealed butterfly valves: urban building systems, urban heating systems, gas transportation systems, environmental protection pipeline systems, petroleum transportation systems, offshore platforms, inorganic chemicals, energy power generation and other major industrial fields such as process control and other important pipelines .