... 19years experience 2.low leakagerate,high quality 3.OEM is welcome 4.CE High quality Anti-sweat worm gear ... oil, air, weak acid and soda etc. Applicable temperature of electro valve : -20-135°C Butterfly valve ... 60.6suitable medium Air, water, sewage, steam, gas, oil, etc. Drive type Manual, worm worm ... gear drive, gas drive, electric drive. Part name Material Body Cast ...