Worm Gear QT450NiCr Flange Triple Eccentric Butterfly Valve Material:WCB Nominal Pressure:PN10 Nominal Diameter:DN800 End Connection:Wafer Operation:Worm Gear Working Temp:-29℃~450℃ Test/Inspection:API 598/ISO 5208 NACE:NACE0175 PS:We can manufacture valves as customers’ requirements.