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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 -- 8; 10; 15; 20; 25; 32; 40; 50; 65; 80; 100; 150; 200; 250; 300; 350; 400; 450; 500 corresponding to nominal pipe sizes NPS -- ¼; 3/8; ½; ¾; 1; 1¼; 1½; 2; 2½; 3; 4; 6; 8; 10; 12; 14; 16; 18; 20; and applies for pressure designations -- Class 150; 300; 600; 800 (Class 800 applies only for valves with reduced bore and with threaded and socket welding end); -- PN 16; 25; 40. It includes provisions for testing and inspection and for valve characteristics as follows: -- flanged and butt-welded ends, in sizes 15 <= DN <= 500 (½ <= NPS <= 20); -- socket welding and threaded ends, in sizes 8 <= DN <= 50 (¼ <= NPS <= 2); -- body seat openings designated as full bore, reduced bore and double reduced bore; -- materials.