... Electric Type Material:Cast Steel or Stainless Steel Pneumatic Regulating Valve For Water, Steam, Oil, Acid, Gas Size:DN20~500 1''- ... ,WC9,Ti,Ni,Hastelloy,Monel etc Feature: Using the balancing valve core structure , little axial unbalanced force, large allowable differential ... .,bellows sealing type,jacket insulation type ,shut-off control type Pneumatic Regulating Valve For Water Steam Oil Acid Gas