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 ... media is corrosive, non-corrosive gas, liquid, semiliquid and solid powder. The valve is used as a control and cut-off ...