API Std 608 PDF
This standard specifies the requirements for metal ball valves suitable for petroleum, petrochemical, and industrial applications—corresponding to the nominal pipe sizes in ASME B36.10—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); and
•threaded ends in sizes DN 8 through DN 50 (NPS 1/4 through NPS 2).
This standard applies to metal ball valves with pressure classes as follows:
•flanged ends in Classes 150, 300, and 600;
•flanged ends in Classes 900, 1500, and 2500 in sizes DN 15 through DN 50 (NPS 1/2 through NPS 2) only;
•butt-welding ends in Classes 150, 300, and 600;
•butt-welding ends in Classes 800, 900, 1500, and 2500 in sizes DN 15 through DN 50 (NPS 1/2 through NPS 2) only;
•socket-welding ends and socket-welding by threaded ends in Classes 150, 300, 600, 800, 900, 1500, and 2500;
•threaded ends in Classes 150, 300, 600, and 800.
This standard establishes requirements for bore sizes described as:
•full bore;
•reduced bore.
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