Size of Wafer Check valve: NPS 2"-48" 
Pressure: Class 150-900 
Material of Wafer Check valve: WCB,LCB,CF8,CF8M,CF3,CF3M,WC6,WC9,C5,C12 
Design & Manufacture Std.: API 6D,API 594,ASME B16.34 
Face to Face Std.: API 594,API 6D 
End Connection Std.: ASME B16.5,ASME B 16.47 
Test Standard of Wafer Check valve: ISO5208,API 6D