金属球阀 法兰式、螺纹式和焊接式

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;