... Electric Type Material:Cast Steel or Stainless Steel Pneumatic Regulating Valve For Water, Steam, Oil, Acid, Gas Size:DN20 ... highly reduced by 30%,weight reduced by 30%.ZJHMW bellows seal regulator valve, mobile stem formed completely sealed ,plugging away fluid ... .,middle TEM.,low TEM.,bellows sealing type,jacket insulation type ,shut-off control type Pneumatic Regulating Valve For Water Steam Oil ...