... Steel Pneumatic Regulating Valve For Water, Steam, Oil, Acid, Gas Size:DN20~500 1''-20''Inherent Rangeability:50:1Body Material ... areas(cm2)2803505609001400Piston typeSignal range Kpa20-100,40-200,80-240Supply pressure Mpa0.1-0.40.4-0.7Inherent flow characteristicsLinear ,Equal-percentage ... materials304,316,420,Ti,Ni,Hastelloy,Monel etc.Working TEM-40~+230(normal TEM.),+230~+45(middle TEM.),+450~+560( ...