-API Cast Steel Check Valve
-Design and Manufacture: API 6D

-Inspection and Test: API 598 0r API 6D

-End flange dimension: ASME 816.5.  ASME B16.47 A.  MSS SP-44

-BW end dimension: ASME B16.25

-Face to face and end to end: ASME B16.10.  API 6D

-Pressure-temperature ratings: ASME B16.34