... valve 1.19years experience 2.low leakagerate,high quality 3.OEM is welcome 4.CE High quality Anti-sweat worm gear butterfly valve ... aluminum bronze Shaft of valve : 20# steel,SS420,SS304&316 Seat of valve : EPDM, wear-resistant EPDM,NBR,PTFE,Viton Handle ... water, sewage, steam, gas, oil, etc. Drive type Manual, worm worm gear drive, gas drive, electric drive. Part name Material Body Cast iron, nodular ...