... 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 ... by 30%,weight reduced by 30%.ZJHMW bellows seal regulator valve, mobile stem formed completely sealed ,plugging away fluid leakage. ...