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DS/ISO 28921-1:2022
Industrial valves - Isolating valves for low-temperature applications - Part 1: Design, manufacturing and production testing
This document specifies requirements for design, dimensions, material, fabrication and production testing of gate, globe, ball/plug and butterfly valve design types used as isolation valves and check valves for low-temperature applications.*This document is applicable to isolation valves for use in low and cryogenic temperature service where the design low-temperature service is -50 °C down to –196 °C.*This document does not apply to valves for cryogenic services, designed in accordance with ISO 21011, used with cryogenic vessels.*Where the requirements of this document vary from those given in the valve product standards, the requirements of this document apply.*This document is applicable to valves with body, bonnet, bonnet extension or cover made of metallic materials.*This document is applicable to:*– valves of nominal sizes DN: 10; 15; 20; 25; 32; 40; 50; 65; 80; 100; 125; 150; 200; 250; 300; 350; 400; 450; 500; 600; 650; 700; 750; 800; 850; 900; 950; 1 000; 1 050; 1 200; 1 350; 1 400; 1 500; 1 600; 1 650; 1 800,*– corresponding to nominal pipe sizes NPS: ; ½; ¾; 1; 1 ¼; 1 ½; 2; 2 ½; 3; 4; 5; 6; 8; 10; 12; 14; 16; 18; 20; 24; 26; 28; 30; 32; 34; 36; 38; 40; 42; 48; 54; 56; 60; 64; 66; 72,*and applies to pressure designations:*– PN 16; 25; 40; 100; 160; 250; 400,*– Class 150; 300; 600; 800; 900; 1 500; 2 500.*NOTE Not all type and size combination are available in all pressure ratings.*This document does not apply to safety valves and control valves.
Danish Standards [ds]