Hot Spot ISO 28921-1 Isolating Valves for Low-temperature Applications- Design Manufacture and Production Testing

What is it?

ISO 28921-1:2022 Isolating valves for low-temperature applications — Part 1: Design, manufacturing and production testing has now successfully passed through the final ballot stage and will shortly be published.

This document specifies the requirements for the design, manufacture and testing of gate, globe, ball / plug and butterfly isolation valve types for use in low and cryogenic temperature service between −50 °C and −196°C.

The revised standard now covers isolating valves of sizes DN:10 – 1,800 (NPS 3/8 - 72) and pressure designations PN16 – 400 and Class 150 – 2500. This document excludes safety valves and control valves and it does not apply to valves for cryogenic vessels, designed in accordance with ISO 21011, which is also currently under revision by a different ISO committee TC 220.

Why is it Important?

This revised standard extends the size range and pressure designations of the first edition, and clearly excludes control valves and safety valves from its scope.

Annex A covering production testing has been updated and changes have also been made to the referenced type testing procedures covered by ISO 28921-2 which is also currently under revision by TC 153.

If you are involved in the design and manufacture of cryogenic valves this standard contains requirements that may directly affect your products and business.


This second edition will cancel and replace ISO 28921-1:2013.

Continuous Improvement

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Please Note: This Hotspot is for information purposes, and we invite comments from BVAA members only. Please also note that at time of publication ballots may be closed. For more information, please contact the Secretariat.

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