SIST EN ISO 21922:2022

SLOVENSKI STANDARD
oSIST prEN ISO 21922:2018
01-oktober-2018
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Refrigerating systems and heat pumps - Valves - Requirements, testing and marking
(ISO/DIS 21922:2018)
Kälteanlagen und Wärmepumpen - Ventile - Anforderungen, Prüfung und
Kennzeichnung (ISO/DIS 21922:2018)
Système de réfrigération et pompes à chaleur - Robinetterie - Exigences, essais et
marquage (ISO/DIS 21922:2018)
Ta slovenski standard je istoveten z: prEN ISO 21922
ICS:
23.060.20 Zapirni ventili (kroglasti in Ball and plug valves
pipe)
27.080 7RSORWQHþUSDONH Heat pumps
27.200 Hladilna tehnologija Refrigerating technology
oSIST prEN ISO 21922:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 21922:2018

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oSIST prEN ISO 21922:2018
DRAFT INTERNATIONAL STANDARD
ISO/DIS 21922
ISO/TC 86/SC 1 Secretariat: ANSI
Voting begins on: Voting terminates on:
2018-07-18 2018-10-10
Refrigerating systems and heat pumps — Valves —
Requirements, testing and marking
Titre manque
ICS: 27.200; 27.080
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 21922:2018(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2018

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oSIST prEN ISO 21922:2018
ISO/DIS 21922:2018(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
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ii © ISO 2018 – All rights reserved

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oSIST prEN ISO 21922:2018
ISO/DIS 21922:2018(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 List of symbols . 3
5 General requirements . 5
5.1 Installation and operation . 5
5.2 Components under pressure . 5
5.3 Excessive mechanical stress . 5
5.4 Tightness . 6
5.5 Functioning of hand-operated valves . 6
5.6 Functioning of actuator-operated valves. 6
6 Materials . 6
6.1 General . 6
6.1.1 Using metallic materials . 6
6.1.2 Using non-metallic materials . 6
6.2 Requirements for materials to be used for pressure bearing parts . 6
6.3 Compatibility of connections . 7
6.4 Ductility . 7
6.5 Ageing . 7
6.6 Castings . 7
6.7 Forged and welded components . . 7
6.8 Nuts, bolts and screws . 7
6.9 Spindles . 8
6.10 Glass materials . 8
6.11 Requirements for documentation . 8
6.12 Impact energy KV measurement on sub-sized specimens. 9
7 Design . 9
7.1 General . 9
7.2 Maximum allowable pressure .10
7.3 Valve strength design .10
7.4 Bodies and bonnets .11
7.5 Nuts, bolts, screws, fasteners and seals .11
7.6 Seat tightness .11
7.6.1 General.11
7.6.2 Seat tightness: type test .12
7.7 Screwed spindles and shafts .13
7.8 Design of glands .13
7.9 Valve seats .14
7.10 Caps . .14
7.11 Hand operated valves .15
7.12 Corrosion protection .15
8 Workmanship .15
9 Production testing .16
9.1 Strength pressure testing .16
9.2 Tightness testing .16
9.3 Seat sealing capacity .17
9.4 Caps . .17
10 Marking and additional information .17
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oSIST prEN ISO 21922:2018
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10.1 General .17
10.2 Marking .17
10.3 Hand-operated regulating valves .18
10.4 Caps . .18
11 Documentation .18
11.1 Documentation for small valves .18
11.2 Documentation for large valves .19
Annex A (normative) Procedure for the design of a valve by calculation .20
Annex B (normative) Experimental design method for valves .23
Annex C (normative) Determination of the allowable pressure at the maximum operating
temperature .27
Annex D (normative) Determination of the allowable pressure at minimum operating
temperature (Requirements to avoid brittle fracture) .28
Annex E (informative) Compilation of material characteristics of often used materials .38
Annex F (informative) Justification of the individual methods .62
Annex G (normative) Determination of category for valves .68
Annex H (informative) Stress corrosion cracking .71
Annex I (informative) DN System .74
Annex J (normative) Additional requirements sight glasses and indicators.77
Annex K (normative) Compatibility screening test .80
Annex L (normative) Method for sizing the operating element of hand-operated valves .84
Bibliography .87
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oSIST prEN ISO 21922:2018
ISO/DIS 21922:2018(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by ISO Technical Committee TC 86, Refrigeration and air-conditioning,
Subcommittee SC 1, Safety and environmental requirements for refrigerating systems and by Technical
Committee CEN/TC 182, Refrigerating systems, safety and environmental requirements in collaboration
in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
© ISO 2018 – All rights reserved v

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oSIST prEN ISO 21922:2018
ISO/DIS 21922:2018(E)

Introduction
This International Standard is intended to describe the safety requirements, safety factors, test
methods, test pressures used, and marking of valves and other components with similar bodies for use
in refrigerating systems.
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oSIST prEN ISO 21922:2018
DRAFT INTERNATIONAL STANDARD ISO/DIS 21922:2018(E)
Refrigerating systems and heat pumps — Valves —
Requirements, testing and marking
1 Scope
This International standard 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.
Valves in the sense of this standard include extension pipes.
The standard describes the procedure to be followed when designing 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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
I EC 6 053 4 -2-1:2011/COR 1: 2014, Industrial-process control valves — Part 2-1: Industrial-process control
valves — Part 2-1: Flow capacity — Sizing equations for fluid flow under installed conditions
ISO 148-1:2009, Metallic materials. Charpy pendulum impact test — Part 1: Test method
ISO 6708:1995, Pipework components — Definition and selection of DN (nominal size)
ISO 7268:1983/Amd.1:1984, Pipe components — Definition of nominal pressure / Amendment 1
ISO 10474:2013, Steel and steel products — Inspection documents
ISO/TR 15608:2013, Welding — Guidelines for a metallic material grouping system
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply / the terms and definitions
given in [external document reference] and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http: //www .electropedia .org/
— ISO Online browsing platform: available at http: //www .iso .org/obp
3.1
valve
component with a pressure enclosure and an intended additional functionality, such as influencing the
fluid flow by opening, closing or partially obstructing the passage of the flow or by diverting or mixing
the fluid flow, or indicating moisture content
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oSIST prEN ISO 21922:2018
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3.2
operating range
combination of temperature and pressure conditions at which the valve can safely be operated
3.3
nominal size (DN)
an alphanumeric designation of size for components of a pipework system, which is used for reference
purposes. It comprises the letters DN followed by a dimensionless whole number which is indirectly
related to the physical size, in millimetres, of the bore or outside diameter of the end connections
[SOURCE: ISO 6708:1995, definition 2.1]
Note 1 to entry: The number following the letters DN does not represent a measurable value and should not be
used for calculation purposes except where specified in this standard.
Note 2 to entry: Where the nominal size is not specified, for the purpose of this standard it is assumed to be the
internal diameter of the pipe or component in mm (DN/ID).
Note 3 to entry: Nominal size is not the same as port size which is commonly used for the size of the valve seat
opening.
3.4
nominal pressure (PN)
a numerical designation which is a convenient rounded number for reference purposes. All equipment
of the same nominal size (DN) designated by the same PN number shall have compatible mating
dimensions
[SOURCE: ISO 7268:1983/A1: 1984]
3.5
corrosion
all forms of material wastage (e. g. oxidation, erosion, wear and abrasion)
3.6
maximum operating temperature
highest temperature that can occur during operation or standstill of the refrigerating system or during
testing under test conditions
3.7
minimum operating temperature
lowest temperature that can occur during operation or standstill of the refrigerating system or during
testing under test conditions
3.8
pressure bearing parts
part, which is subject to a minimum positive internal pressure of 50 kPa (0,5 bar) during normal
operating conditions
3.9
seat tightness class
letter from A to G indicating the internal tightness of the valve across the valve seat(s)
3.10
competent body
third party organisation which has recognized competence in the assessment of quality systems for the
manufacture of materials and in the technology of the materials concerned
Note 1 to entry: National legislation may place additional requirements on the competent body depending on the
market which the valve is intended for.
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oSIST prEN ISO 21922:2018
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3.11
type of valve connection
standard and size for the valve connection to other equipment directly fixed to the valves end
Note 1 to entry: Possible types of valve connection are e.g.:
a) NPS 2 inch which means a butt-welding connection to ANSI B 36.10 2 inch steel pipe,
b) NPT ½ inch which means a screwed connection with ½ inch male end according to ANSI B 1.20.1,
c) EN 1092-1/11/C/DN 200 x 6,3/PN 40 which means a flange type 11 with facing type C (tongue) of nominal
size DN 200, wall thickness 6,3 mm, PN 40.
3.12
pressure sensitive part
part of a valve which will not have a reliable function after exposure to the greater of 1,5 times PS and
1,25 times PS
0
Note 1 to entry: Examples include bellows, diaphragms or float balls.
4 List of symbols
Symbols used in this Standard are given in Table 1:
Table 1 — List of symbols
A Elongation after fracture where the measured length is equal or greater than mm
L
0,4 times of diameter of the rod
A Elongation after fracture where the measured length is equal to 5 times of diame- %
5
ter of the rod
A Lifetime in years for calculating effect of corrosion; typically 20 years anno
C Factor to compensate for the quality of a casting —
Q
δ Negative wall thickness tolerance mm
e
e Actual wall thickness at given measuring points of the valve to be tested mm
act
e Reference thickness is the minimum material thickness needed to give adequate
B
strength to pressure bearing parts
e Reduction in wall thickness caused by occurrence of corrosion mm
c
e Component wall thickness as specified in the design drawing mm
con
KV Impact rupture energy J
KV Threshold value of impact rupture energy, where the impact rupture energy is J
0
defined as independent of the temperature
t
KV Standard value of impact rupture energy at standard temperature of the material J
0
KV Impact rupture energy at minimum operating temperature TS J
TS min min
3
K is the rate of flow of water in cubic metres per hour for a differential pressure Δp of m /h
VS
1 bar (0,1 MPa) at the rated full opening
L the leakage in percent of K %
VS
N is 31,6 according to Table 1 of IEC 60534-2-1:2011/COR1: 2014 —
6
P Maximum allowable design test pressure bar
F
PS Maximum allowable pressure in common sense, without regarding any influence bar
of temperature
PS Maximum allowable pressure at ambient temperature (− 10 °C to + 50 °C) accord- bar
0
ing to strength design (without temperature correction)
PS Maximum allowable pressure at maximum operating temperature bar
TS max
NOTE  1 MPa = 10 bar
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Table 1 (continued)
PS Maximum allowable pressure at minimum operating temperature bar
TS min
P Minimum burst test pressure (greater than P ) bar
Test F
p Upstream pressure bar
1
p Downstream pressure bar
2
Δp Differential pressure bar
p' Testing pressure of each valve after production bar
Q Mass flow rate kg/h
M
3
Q Downstream volume flow rate m /h
V
2
R Yield strength, 1,0 % offset MPa, N/mm
e 1,0
2
R Yield strength, 1,0 % offset at maximum operating temperature MPa, N/mm
e 1,0 TS max
2
R Yield strength, 0,2 % offset at ambient temperature MPa, N/mm
e 0,2
2
R Proof strength, 0,2 % offset at ambient temperature MPa, N/mm
p 0,2
2
R Proof strength, 0,2 % offset at minimum operating temperature MPa, N/mm
p 0,2 TS min
2
R Proof strength, 0,2 % offset at temperature t MPa, N/mm
p 0,2/t
2
R Proof strength, 0,2 % offset at maximum operating temperature MPa, N/mm
p 0,2 TS max
2
R Proof strength, 1,0 % offset at ambient temperature MPa, N/mm
p 1,0
2
R Upper yield strength MPa, N/mm
eH
2
R Upper yield strength at maximum operating temperature MPa, N/mm
eH TS max
2
R Tensile strength MPa, N/mm
m
2
R Tensile strength at maximum operating temperature MPa, N/mm
m TS max
2
R Actual tensile strength of the material of the valve to be tested MPa, N/mm
m act
2
R Tensile strength used for the design MPa, N/mm
m con
3
ρ Density of the actual fluid kg/m
3
ρ Density of water at 15,5°C kg/m
0
3
ρ Upstream density kg/m
1
3
ρ Downstream density kg/m
2
S Factor to compensate effects of corrosion —
C
S Factor for the calculation of the burst test pressure taking into account the tensile —
con
strength according to Table A.1
S Factor to allow for forming —
F
S Factor taking into consideration the impact rupture energy reduction due to mini- —
TS min
mum operating temperature
S Factor to allow for the reduction in strength due to the maximum operating tem- —
TS max
perature
S Factor to allow for the test pressure —
σ
2
σ Initial design stress MPa, N/mm
con
2
σ Allowable stress values derived from σ MPa, N/mm
corr con
t Lowest temperature at which pressure bearing parts can be used, if their load °C
min 25
amounts to 25 % of the allowable design stress at 20 °C, taking the safety factors
according to Table A.1 into account
t Lowest temperature at which pressure bearing parts can be used, if their load °C
min 75
amounts to 75 % of the allowable design stress at 20 °C, taking the sa
...