This International Standard specifies the requirements for a series of steel ball valves suitable for general-purpose industrial applications. It covers valves of the nominal sizes (see ISO 6708 and ASME B16.34) — DN 8, 10, 15, 20, 25, 32, 40, 50, 65, 80, 100, 150, 200, 250, 300, 350, 400, 450, 500 (NPS 1/4, 3/8, 1/2, 3/4, 1,11/4, 11/2,2,21/2,3,4,6,8, 10, 12, 14, 16, 18 and 20), and is applicable to the following pressure designations (see ISO 7268 or EN 1333, and ASME B16.34): — Class 150; 300; 600; 900 and PN 10; 16; 25; 40; 63; 100. It includes provisions for valve characteristics as follows 1): — flanged and butt-welded ends in sizes 15 ≤ DN ≤500 (1/2≤ NPS s≤ 20); — socket welding ends in sizes 8 ≤ DN ≤ 100 (1/4 ≤ NPS≤ 4); — threaded ends in sizes 8 ≤ DN ≤ 50 (1/4 ≤ NPS ≤ 2); — body seat openings designated as full bore, reduced bore, and double reduced bore; — materials; — testing and inspection.
BS ISO 7121:2007 history
2016BS ISO 7121:2016 Steel ball valves for general-purpose industrial applications
2007BS ISO 7121:2007 Steel ball valves for general-purpose industrial applications
BS ISO 7121:2007 Steel ball valves for general-purpose industrial applications has been changed from BS 5159:1974 Specification for cast iron and carbon steel ball valves for general purposes.