High quality Anti-sweat worm gear butterfly valve 1.19years experience 2.low leakagerate,high quality 3.OEM is welcome 4.CE High quality Anti-sweat worm gear ... ductile iron, Nylon coated ductile iron,SS304,SS316, aluminum bronze Shaft of valve : 20# steel,SS420,SS304&316 Seat of ... , steam, gas, oil, etc. Drive type Manual, worm worm gear drive, gas drive, electric drive. Part name Material Body Cast ...