Cast Iron Manual Wafer Butterfly Valve 1.16 years management,quality assurance 2.Standard:ISO, ANSI,API,BS,DIN,JIS Cast Iron Manual Wafer Butterfly Valve Handle Butterfly is installed in petroleum, chemical, food, medicine, textile,paper making,hydropower, marine, urban water supply and drainage, metallurgy,energy and other system which media is corrosive, non-corrosive gas, liquid, semiliquid ...