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
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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
This document specifies safety requirements, certain functional requirements, and marking of valves and other components with similar bodies, hereinafter called valves, for use in refrigerating systems including heat pumps.
| Committee |
ISO/TC 86
|
| DocumentType |
Standard
|
| Pages |
108
|
| ProductNote |
The date of any NSAI previous adoption may not match the date of its original CEN/CENELEC document. THIS STANDARD IS ALSO REFERS TO ASME BPVC-VIII-1
|
| PublisherName |
National Standards Authority of Ireland
|
| Status |
Current
|
| Supersedes |
| Standards | Relationship |
| ISO 21922:2021 | Identical |
| EN ISO 21922:2021 | Identical |
| EN 12570:2000 | Equivalent |
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