... or Electric Type Material:Cast Steel or Stainless Steel Pneumatic Regulating Valve For Water, Steam, Oil, Acid, Gas Size:DN20~ ... WC9,Ti,Ni,Hastelloy,Monel etc Feature: Using the balancing valve core structure , little axial unbalanced force, large allowable differential ... leak standard ,soft sealing structure valve core up to scratch 5 leak standard.The body fluid mechanics theory designed according to ...