... :Cast Steel or Stainless Steel Pneumatic Regulating Valve For Water, Steam, Oil, Acid, Gas Size:DN20~500 1''-20''Inherent Rangeability ... ,WC9,Ti,Ni,Hastelloy,Monel etc Feature: Using the balancing valve core structure , little axial unbalanced force, large allowable differential ... is 50:1, the rated flow coefficient increases by 30%,Actuator adopt spring structure ,highly reduced by 30%,weight reduced ...