... Type Material:Cast Steel or Stainless Steel Pneumatic Regulating Valve For Water, Steam, Oil, Acid, Gas Size:DN20~500 1''-20 ... disassembling convenience and easy maintenance.The mental valve core structure for many work situation up to scratch 6 leak standard , ... Equal-percentage,Quick-openInherent rangeability50:1Leakage levelHard-sealing 5,4 level,Soft-sealing 6Flange sizeConform with JB/79.1(2)-94 ...