I.S. EN ISO 21922:2021
Current
The latest, up-to-date edition.
Refrigerating systems and heat pumps - Valves - Requirements, testing and marking (ISO 21922:2021)
Hardcopy , PDF
English
11-22-2021
For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.
Only cited Standards give presumption of conformance to New Approach Directives/Regulations.
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 List of symbols
5 General requirements
6 Materials
7 Design
8 Appropriate manufacturing procedures
9 Production testing
11 Documentation
Annex A (normative) Procedure for the design of a valve by calculation
Annex B (normative) Experimental design method for valves
Annex C (normative) Determination of the allowable pressure at the maximum operating
temperature
Annex D (normative) Determination of the allowable pressure at minimum operating
temperature — Requirements to avoid brittle fracture
Annex E (informative) Compilation of material characteristics of frequently used materials
Annex F (informative) Justification of the individual methods
Annex G (normative) Pressure strength verification of valve assemblies
Annex H (normative) Determination of category for valves
Annex I (informative) DN system
Annex J (normative) Additional requirements — Sight glasses and indicators
Annex K (normative) Compatibility screening test
Annex L (informative) Stress corrosion cracking
Annex M (normative) Method for sizing the operating element of hand-operated valves
Bibliography
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