Wafer Dual-plate Check Valve Material:Cast Steel, Alloy Steel, Stainless Steel, Special Steel Nominal Pressure:Class 150~2500 Nominal Diameter:2″~24″ End Connection:RF, FF, M, F, TG, RG Working Temp.:-29℃~+200℃ Design Standard:API 609 Test/Inspection:API 598/ISO 5208 Face to Face:API 609 NACE:NACE 0175 PS：We can manufacture valves as customers’ requirements.