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 ... , steam, gas, oil, etc. Drive type Manual, worm worm gear drive, gas drive, electric drive. Part name Material Body Cast ... mill cast iron, stainless steel and special materials seal ring all kinds of rubber Characteristics of Product: 1.Small ...