... valve 1.19years experience 2.low leakagerate,high quality 3.OEM is welcome 4.CE High quality Anti-sweat worm gear butterfly valve Model ... iron,SS304,SS316, aluminum bronze Shaft of valve : 20# steel,SS420,SS304&316 Seat of valve : EPDM, wear-resistant EPDM ... iron, nodular cast iron, cast steel, alloy steel, stainless steel Disc Ball mill cast iron, stainless steel and special materials seal ring all ...