BS 2080 Face-to-face, centre-to-face, end-to-end, and centre-to-end dimension of flanged and butt-welding end steel valves for the petroleum, petrochemical and allied industries.
BS 4504 Flanges and bolthings for pipes valves and fittings.
BS 5146 Inspection and test of steel valves for the petroleum, petrochemical and allied industries.
BS 5351 Steel ball valves for the petroleum, petrochemical and allied industries.
BS 6755 Testing of valves.
ANSI – American National Standard Institute
B16.11 Forged steel fitting socket-welding and threaded.
B16.5 Steel pipe flanges and flanged fittings.
B16.10 Face-to-face and end to end dimensions of ferrous valves.
B16.25 Butt welding ends.
B16.34 Steel valves – Flanged and butt welding ends.
B16.47 Large diameter steel flanges (NPS 26 through NPS 60)
B31.3 Chemical plant and petroleum refinery piping system.