... Type Material:Cast Steel or Stainless Steel Pneumatic Regulating Valve For Water, Steam, Oil, Acid, Gas Size:DN20~500 1''-20''Inherent ... , disassembling convenience and easy maintenance.The mental valve core structure for many work situation up to scratch 6 leak standard ,soft ... :1Leakage levelHard-sealing 5,4 level,Soft-sealing 6Flange sizeConform with JB/79.1(2)-94,HG20592-97,GB,ANSI,JIS ...