标准编号：ISO 7121:2016
中文名称：一般工业用钢制球阀
英文名称：Steel ball valves for general-purpose industrial applications
发布日期：2016-04
标准范围
This International Standard specifies the requirements for a series of steel ball valves suitable forgeneral-purpose 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, and 600 (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, 20 and 24),and is applicable to the following pressure designations:— PN 10; 16; 25; 40; 63; 100;— Class 150; 300; 600; 800; 900.NOTE Valve characteristics are not necessarily available in all nominal sizes for all pressure designations.For example, Class 800 applies only for valves with threaded end and socket weld ends up to DN 65 (NPS 21/2)and Class 900 applies only for reduced bore body seat openings.It includes provisions for valve characteristics as follows:— flanged and butt-welded ends in sizes 15 ≤ DN ≤ 600 (1/2 ≤ NPS ≤ 24);— 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.
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