A.Main Material Body: ZG25, 304, 316, 316L Ball: 304, 316, 316L Seat: 304, 316, 316L ,EPDM B. Main technical Parameter Nominal Diameter: DN25-DN300 Max.Angel:90. Air supply Pressure(MPa): 0.5-0.8 Nominal Pressure(MPa):1.6 Appliance Temperature:-40-250℃ Control signal voltage: 220VAC, 240VDC Leakage standard: GB/T4213