Industrial valves. Isolating valves for low-temperature applications -- Design, manufacturing and production testing
This part of ISOÂ 28921 specifies requirements for design, dimensions, material, fabrication and production testing of isolation valves for low-temperature applications.
It applies to gate, globe, check, butterfly and ball valves and can be used for other valve types used in low-temperature services.
This part of ISO 28921 covers isolation valves for use in cryogenic temperature service where the design low-temperature service is –50 °C down to –196 °C.
This part of ISOÂ 28921 does not apply to valves for cryogenic services, designed in accordance with ISOÂ 21011 , used with cryogenic vessels.
Where the requirements of this part of ISOÂ 28921 vary from those given in the valve product standards, the requirements of this part of ISOÂ 28921 apply.
This part of ISOÂ 28921 covers valves with body, bonnet, bonnet extension or cover made of metallic materials.
It covers 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,
corresponding to nominal pipe sizes NPS: 3/8; 1/2; 3/4; 1; 11/4; 11/2; 2; 21/2; 3; 4; 5; 6; 8; 10; 12; 14; 16; 18; 20; 24; 26; 28; 30; 32; 34; 36,
and applies to pressure designations:
PN 16; 25; 40; 100; 160; 250.
Class 150; 300; 600; 800; 900; 1Â 500.
PN 250 and Class 1Â 500 in sizes DNÂ >Â 100 and NPSÂ >Â 4 are not covered in this part of ISOÂ 28921 .
| SDO | BSI: British Standards Institution |
| Document Number | ISO 28921-1 |
| Publication Date | March 31, 2017 |
| Language | en - English |
| Page Count | 34 |
| Revision Level | |
| Supercedes | |
| Committee | PSE/18 |