... leakagerate,high quality 3.OEM is welcome 4.ISO,CE Worm SS Lug butterfly valve Model of valve:D371XBody of valve ... ductile iron, Nylon coated ductile iron,SS304,SS316, aluminum bronze Shaft of valve : 20# steel,SS420,SS304&316 Seat of valve ... Air, water, sewage, steam, gas, oil, etc. Drive type Manual, worm worm gear drive, gas drive, electric drive. Part name Material Body ...