... high quality 3.OEM is welcome 4.CE High quality Anti-sweat worm gear butterfly valve Model of valve:D371XBody of valve ... Seal test 1.11.76 Air Seal Test 0.60.6suitable medium Air, water, sewage, steam, gas, oil, etc. Drive type ... iron, stainless steel and special materials seal ring all kinds of rubber Characteristics of ... 3.Disc has two-way bearing, perfect seal, without leakage under the pressure test. ...