A.Main Material Body: ZG230-450 ZG1Cr18Ni9Ti ZG0Cr17Ni12Mo2 Ball:1Cr18Ni9Ti Seat:1Cr18Ni9Ti Diaphragm:Nitrile rubber B.Main Technical Parameter Nominal Diameter: DN20-DN200 Nominal Pressure(MPa):0.6,1.6,4.0,6.4 Working Temperature(℃):-20-200, -40-250, -60-450 Surrounding Temperature(℃):-40-85 ℃ Air supply pressure(MPa):0.14,0.25,0.4 Input signal: air: 0.02-0.1MPa power: 0-10, 4-20mA (equipped with power/air positioner) Intrinsic error: ?%( without positioner) ?%( with positioner) Return Difference:3%(without positioner ) Dead zone:1%(without positioner) Leakage standard: GB4213/T IV