scope:

This international standard specifies requirements for the design, materials, pressure-temperature ratings and testing of butterfly valves having metallic bodies for use in flanged or butt welding piping systems and used for general purposes. This International Standard covers butterfly valves of the following nominal sizes, DN and NPS: - DN 40; 50; 65; 80; 100; 125; 150; 200; 250; 300; 350; 400; 450; 500 (550); 600 (650); 700; 750; 800; 900; 1 000; 1 200; 1 400; 1 600; 1 800; 2 000, 2 200, 2 400. - NPS 1 ½; 2; 2 ½; 3; 4; 5; 6; 8; 10; 12; 14; 16; 18; 20; 22; 24; 26; 28; 30; 32; 36; 40; 48; 56; 64; 72; 80. This International Standard is applicable to butterfly valves of the following nominal pressures, PN and Class: - PN 2,5; 6; 10; 16; 25; 40. - Class 125; Class 150; Class 300.