... valve 1.19years experience 2.low leakagerate,high quality 3.OEM is welcome 4.CE High quality Anti-sweat worm gear butterfly valve Model ... EPDM, wear-resistant EPDM,NBR,PTFE,Viton Handle of valve : iron, punching malleable iron, aluminum handle Normal Diameter of valve: DN25- 300 ... on-off operation. 3.Disc has two-way bearing, perfect seal, without leakage under the pressure test. 4.Flow curve tending ...