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 ... turn 90degree.3.Low flow resistance,flow characteristic approximates tilt line, energy-saving.4.Reliable seal,zero leakage,long service life ...