American Petroleum Institute

Metal Ball Valves - Flanged, Threaded, and Welding Ends - FIFTH EDITION
 N STD 608

Annotation

This standard specifies the requirements for metal ball valves suitable for petroleum, petrochemical, and industrial applications that have:

— flanged ends in sizes DN 15 through DN 600 (NPS 1/2 through NPS 24);

— butt-welding ends in sizes DN 15 through DN 600 (NPS 1/2 through NPS 24);

— socket-welding ends in sizes DN 8 through DN 50 (NPS 1/4 through NPS 2);

— threaded ends in sizes DN 8 through DN 50 (NPS 1/4 through NPS 2).

Corresponding to the nominal pipe sizes in ASME B36.10M.

This standard applies to metal ball valves with pressure classes as follows:

— flanged ends in Classes 150, 300, and 600;

— butt-welding ends in Classes 150, 300, and 600;

— socket-welding ends in Classes 150, 300, 600, and 800;

— threaded ends in Classes 150, 300, 600, and 800.

This standard establishes requirements for bore sizes described as:

— full bore;

— single reduced bore;

— double reduced bore.

This standard applies to floating (seat-supported) ball (Figure B.1) and trunnion ball valve designs (Figure B.2). These figures are to be used only for the purpose of establishing standard nomenclature for valve components— other floating and trunnion designs also exist.