High quality Anti-sweat worm gear butterfly valve 1.19years experience ... OEM is welcome 4.CE High quality Anti-sweat worm gear butterfly valve Model of valve:D371XBody of ... Viton Handle of valve : iron, punching malleable iron, aluminum handle Normal Diameter of valve: DN25- 300 Normal ... sewage, steam, gas, oil, etc. Drive type Manual, worm worm gear drive, gas drive, electric drive. Part name Material ...