... experience 2.low leakagerate,high quality 3.OEM is welcome 4.CE High quality Anti-sweat worm gear ... .6suitable medium Air, water, sewage, steam, gas, oil, etc. Drive type Manual, worm worm ... gear drive, gas drive, electric drive. Part name Material Body ... seal, without leakage under the pressure test. 4.Flow curve tending to straight-line. Excellent regulation performance ...