BS ISO 7121:2006

Steel ball valves for general-purpose industrial applications. | Status: Revised, Superseded, Withdrawn

1 Scope 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 ≤ 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.