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 ... ,flow characteristic approximates tilt line, energy-saving.4.Reliable seal,zero leakage,long service life.5.Can be made from various materials ...