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BS EN ISO 21922:2021

BS EN ISO 21922:2021

$215.11

Refrigerating systems and heat pumps. Valves. Requirements, testing and marking

Published By Publication Date Number of Pages
BSI 2021 104
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This European Standard specifies safety requirements, safety factors, test methods, test pressures used and marking of refrigerating valves and other components with similar bodies, hereinafter called valves, for use in refrigerating systems. It describes the procedure to be followed when designing (by calculation or by an experimental design method) valve parts subjected to pressure as well as the criteria to be used in the selection of materials. The standard describes methods by which reduced impact values at low temperatures may be taken into account in a safe manner. This standard applies to the design of bodies and bonnets for pressure relief devices, including bursting disc devices, with respect to pressure containment but it does not apply to any other aspects of the design or application of pressure relief devices.

PDF Catalog

PDF Pages PDF Title
2 undefined
11 Foreword
12 Introduction
13 1 Scope
2 Normative references
3 Terms and definitions
16 4 List of symbols
18 5 General requirements
5.1 Installation and operation
5.2 Components under pressure
19 5.3 Excessive mechanical stress
5.4 Tightness
5.5 Functioning of hand-operated valves
5.6 Functioning of actuator-operated valves
6 Materials
6.1 General
6.1.1 Using metallic materials
6.1.2 Using non-metallic materials
20 6.2 Requirements for materials to be used for pressure bearing parts
6.3 Compatibility of connections
6.4 Ductility
6.5 Ageing
6.6 Castings
6.7 Forged and welded components
6.8 Nuts, bolts and screws
21 6.9 Spindles
6.10 Glass materials
6.11 Requirements for documentation
22 6.12 Impact energy KV measurement on sub-sized specimens
7 Design
7.1 General
23 7.2 Maximum allowable pressure
7.3 Valve and valve assembly strength design
24 7.4 Bodies and bonnets
7.5 Nuts, bolts, screws, fasteners and seals
7.6 Seat tightness
7.6.1 General
25 7.6.2 Seat tightness: type test
26 7.7 Screwed spindles and shafts
7.8 Design of glands
27 7.9 Valve seats
7.10 Caps
28 7.11 Hand operated valves
7.12 Corrosion protection
8 Appropriate manufacturing procedures
29 9 Production testing
9.1 Strength pressure testing
9.2 Tightness testing
30 9.3 Seat sealing capacity
9.4 Caps
10 Marking and additional information
10.1 General
31 10.2 Marking
10.3 Example how to mark the allowable limits of pressure and temperature
10.4 Hand-operated regulating valves
10.5 Caps
32 11 Documentation
11.1 General
11.2 Documentation for valves
11.3 Additional documentation for valve assemblies
33 Annex A (normative) Procedure for the design of a valve by calculation
36 Annex B (normative) Experimental design method for valves
40 Annex C (normative) Determination of the allowable pressure at the maximum operating temperature
41 Annex D (normative) Determination of the allowable pressure at minimum operating temperature — Requirements to avoid brittle fracture
52 Annex E (informative) Compilation of material characteristics of frequently used materials
72 Annex F (informative) Justification of the individual methods
78 Annex G (normative) Pressure strength verification of valve assemblies
79 Annex H (normative) Determination of category for valves
84 Annex I (informative) DN system
87 Annex J (normative) Additional requirements — Sight glasses and indicators
90 Annex K (normative) Compatibility screening test
94 Annex L (informative) Stress corrosion cracking
97 Annex M (normative) Method for sizing the operating element of hand-operated valves
99 Bibliography

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BS EN ISO 21922:2021
$215.11