Design and manufacture:
ASME B16.34,API 6D,BS1868
Face to face dimensions:
ASME B16.10,API 6D,DIN3202
Pressure test:
API 598,API 6D,ISO 5208,BS6755
End flange dimensions :
ASME B16.5,ASME B16.47,DIN2501,ASME B16.25
Check Valve