... Steel or Stainless Steel Pneumatic Regulating Valve For Water, Steam, Oil, Acid, Gas Size:DN20~500 1''-20''Inherent ... Ti,Ni,Hastelloy,Monel etc Feature: Using the balancing valve core structure , little axial unbalanced force, large allowable ... -sealing 5,4 level,Soft-sealing 6Flange sizeConform with JB/79.1(2)-94,HG20592-97,GB, ... TEM.,bellows sealing type,jacket insulation type ,shut-off control type