This International Standard specifies the requirements for a series of metal ball valves suitable for petroleum, petrochemical, natural gas plants, and related industrial applications. It covers valves of the nominal sizes DN ¾ð 8; 10; 15; 20; 25; 32; 40; 50; 65; 80; 100; 150; 200; 250; 300; 350; 400; 450; 500; 600 corresponding to nominal pipe sizes NPS ¾ð ¼; \!; ½; ¾; 1; 1¼; 1½; 2; 2½; 3; 4; 6; 8; 10; 12; 14; 16; 18; 20; 24 and applies for pressure designations ¾ð Class 150; 300; 600; 800 (Class 800 applies only for valves with threaded and socket welding end); ¾ð PN 16; 25; 40. It includes provisions for testing and inspection and for valve characteristics as follows: ¾ð flanged and butt-welded ends, in sizes 15 d" DN d" 600 (½ d" NPS d" 24); ¾ð socket welding and threaded ends, in sizes 8 d" DN d" 50 (¼ d" NPS d" 2); ¾ð body seat openings designated as full bore, reduced bore and double reduced bore; ¾ð materials.