... leakagerate,high quality 3.OEM is welcome 4.ISO,CE Worm SS Lug butterfly valve Model of valve:D371XBody of valve ... /ductile iron/wcb Disc of valve : Ni coated ductile iron, Nylon coated ductile iron,SS304,SS316, aluminum bronze Shaft of valve ... Air, water, sewage, steam, gas, oil, etc. Drive type Manual, worm worm gear drive, gas drive, electric drive. Part name Material Body ...