Swing cast steel check valve describe:
Size: NPS 2"-56"  
Pressure: Class 150-1500  
Material:WCB,LCB,WC6,WC9,C12,C5,CF8,CF3,CF3M,CF8M ,etc.

Applicable standards:
.STEEL CHECK VALVES,BS1868/API6D
.STEEL CHECK VALVES,ISO 14313
.STEEL VALVES,ASME B16.34
.FACE TO FACE,ASME B 16.10
.END FLANGES,ASME B 16.5
.BUTTWELDING ENDS,ASME B16.25
.INSPECTION AND TEST,API 598/API 6D