EN ISO 21922:2021/A1:2024
(Amendment)Refrigerating systems and heat pumps - Valves - Requirements, testing and marking - Amendment 1 (ISO 21922:2021/Amd 1:2024)
Refrigerating systems and heat pumps - Valves - Requirements, testing and marking - Amendment 1 (ISO 21922:2021/Amd 1:2024)
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.
This document includes requirements for valves with extension pipes.
This document 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.
This document describes methods by which reduced impact values at low temperatures may be taken into account in a safe manner.
This document 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.
In addition, this document is applicable to valves with a maximum operating temperature not exceeding 200 °C and a maximum allowable pressure not exceeding 160 bar[1].
[1] 1 bar = 0,1 MPa.
Kälteanlagen und Wärmepumpen - Ventile - Anforderungen, Prüfung und Kennzeichnung - Änderung 1 (ISO 21922:2021/Amd 1:2024)
Dieses Dokument legt die Sicherheitsanforderungen, bestimmte funktionale Anforderungen und die Kennzeichnung von Ventilen und anderen Bauteilen, im Folgenden kurz Ventile genannt, für die Verwendung in Kälteanlagen einschließlich Wärmepumpen fest.
Dieses Dokument enthält Anforderungen für Ventile mit Verlängerungsrohren.
Dieses Dokument beschreibt das Verfahren, das bei der Konstruktion von druckbeanspruchten Ventilen zugrunde zu legen ist, sowie die bei der Auswahl von Werkstoffen für Ventilteile zu berücksichtigenden Kriterien.
Dieses Dokument beschreibt Methoden, nach denen reduzierte Werte für die Kerbschlagarbeit bei niedriger Temperatur auf sichere Art und Weise berücksichtigt werden können.
Dieses Dokument gilt für die Konstruktion von Gehäusen und Oberteilen für Druckentlastungseinrichtungen, einschließlich Berstscheibeneinrichtungen, im Hinblick auf die Druckfestigkeit, sie gilt jedoch nicht für andere Aspekte der Konstruktion oder die Anwendung von Druckentlastungseinrichtungen.
Ferner gilt dieses Dokument für Ventile mit einer maximalen Betriebstemperatur von nicht mehr als 200 °C und einem maximal zulässigen Druck von nicht mehr als 160 bar.
Systèmes de réfrigération et pompes à chaleur - Robinetterie - Exigences, essais et marquage - Amendement 1 (ISO 21922:2021/Amd 1:2024)
Le présent document spécifie les exigences de sécurité, certaines exigences fonctionnelles et le marquage des robinets et autres composants possèdant un corps similaire, ci-après appelés robinets, pour une utilisation dans les systèmes de réfrigération, y compris les pompes à chaleur.
Le présent document comprend des exigences pour les robinets avec des tuyaux d’extension.
Le présent document décrit la procédure à suivre lors de la conception des éléments de robinetterie soumis à une pression ainsi que les critères à utiliser dans le choix des matériaux.
Le présent document décrit des méthodes permettant de prendre en compte en toute sécurité les valeurs de résilience faibles à basse température.
Le présent document s'applique à la conception des corps et des chapeaux des dispositifs limiteurs de pression, y compris les dispositifs à disque de rupture, eu égard au confinement de la pression, mais elle ne s'applique à aucun autre aspect de la conception ou de l'application des dispositifs limiteurs de pression.
En outre, le présent document est applicable aux robinets dont la température maximale de fonctionnement ne dépasse pas 200 °C et dont la pression maximale admissible ne dépasse pas 160 bar[1].
[1] 1 bar = 0,1 MPa.
Hladilni sistemi in toplotne črpalke - Ventili - Zahteve, preskušanje in označevanje - Dopolnilo A1 (ISO 21922:2021/FDAmd1:2024)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 21922:2022/oprA1:2023
01-april-2023
Hladilni sistemi in toplotne črpalke - Ventili - Zahteve, preskušanje in označevanje
- Dopolnilo A1 (ISO 21922:2021/DAM 1:2023)
Refrigerating systems and heat pumps - Valves - Requirements, testing and marking -
Amendment 1 (ISO 21922:2021/DAM 1:2023)
Kälteanlagen und Wärmepumpen - Ventile - Anforderungen, Prüfung und
Kennzeichnung - Änderung 1 (ISO 21922:2021/DAM 1:2023)
Systèmes de réfrigération et pompes à chaleur - Robinetterie - Exigences, essais et
marquage - Amendement 1 (ISO 21922:2021/DAM 1:2023)
Ta slovenski standard je istoveten z: EN ISO 21922:2021/prA1
ICS:
23.060.20 Zapirni ventili (kroglasti in Ball and plug valves
pipe)
27.080 Toplotne črpalke Heat pumps
27.200 Hladilna tehnologija Refrigerating technology
SIST EN ISO 21922:2022/oprA1:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
SIST EN ISO 21922:2022/oprA1:2023
SIST EN ISO 21922:2022/oprA1:2023
DRAFT AMENDMENT
ISO 21922:2021/DAM 1
ISO/TC 86/SC 1 Secretariat: ANSI
Voting begins on: Voting terminates on:
2023-02-20 2023-05-15
Refrigerating systems and heat pumps — Valves —
Requirements, testing and marking
AMENDMENT 1
Systèmes de réfrigération et pompes à chaleur — Robinetterie — Exigences, essais et marquage
AMENDEMENT 1
ICS: 27.200; 27.080
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
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STANDARDS MAY ON OCCASION HAVE TO
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WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO 21922:2021/DAM 1:2023(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 2023
SIST EN ISO 21922:2022/oprA1:2023
ISO 21922:2021/DAM 1:2023(E)
DRAFT AMENDMENT
ISO 21922:2021/DAM 1
ISO/TC 86/SC 1 Secretariat: ANSI
Voting begins on: Voting terminates on:
Refrigerating systems and heat pumps — Valves —
Requirements, testing and marking
AMENDMENT 1
Systèmes de réfrigération et pompes à chaleur — Robinetterie — Exigences, essais et marquage
AMENDEMENT 1
ICS: 27.200; 27.080
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2023
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
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WHICH REFERENCE MAY BE MADE IN
Reference number
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NATIONAL REGULATIONS.
Website: www.iso.org ISO 21922:2021/DAM 1:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
SIST EN ISO 21922:2022/oprA1:2023
ISO 21922:2021/DAM 1:2022(E)
Refrigerating systems and heat pumps — Valves —
Requirements, testing and marking
AMENDMENT 1
In Table 1 replace variable description of K , L, and Q with:
VS M
Table 1 — List of symbols
K Flow coefficient of the valve m /h
VS
L Leakage percentage %
Q Valve leakage mass flow rate measured with air kg/h
M
In Table 1 replace Q with Q and insert a new variable description of Q :
V V1 V2
Table 2 — List of symbols
Q Valve leakage volume flow rate measured upstream with air m /h
V1
Q Valve leakage volume flow rate measured downstream with air m /h
V2
Replace 7.6 and Table 3 with:
7.6 Seat tightness
7.6.1 General
This clause applies to components where internal seat tightness is a design feature. The seat tightness
shall be classified according to Table 3.
The maximum leakage percentage, L, is calculated as described in 7.6.2. The maximum values of L for a
given seat tightness class are listed in Table 3.
Table 3 — Type test requirements for seat tightness
Maximum leakage percentage, Maximum leakage volume flow, Q , measured
V
Seat tightness class
a a
L downstream
Zero bubbles or equivalent measured during one
A ―
b
minute
Zero bubbles or equivalent measured during one
B ―
minute
c
C 0,002 % ―
c
D 0,01 % ―
c
E 0,025 % ―
c
F 0,05 % ―
a
For type test the manufacturer shall measure the leakage at ambient temperature covering the whole differential
pressure range. For manual valves, see Table 4 for suggested upper limits to the maximum differential pressure.
b
For safety valves the manufacturer shall measure the leakage up to 0,9 × set pressure of the valve.
c
The maximum downstream leakage volume flow corresponding to the maximum leakage percentage can be calculated
using equation (3) in clause 7.6.2.
d
For seat tightness class H, testing shall be conducted to verify the seat tightness specified in the technical literature.
SIST EN ISO 21922:2022/oprA1:2023
ISO 21922:2021/DAM 1:2022(E)
TTabablele 3 3 ((ccoonnttiinnueuedd))
Maximum leakage percentage, Maximum leakage volume flow, Q , measured
V
Seat tightness class
a a
L downstream
c
G 0,1 % ―
d
H ― ―
a
For type test the manufacturer shall measure the leakage at ambient temperature covering the whole differential
pressure range. For manual valves, see Table 4 for suggested upper limits to the maximum differential pressure.
b
For safety valves the manufacturer shall measure the leakage up to 0,9 × set pressure of the valve.
c
The maximum downstream leakage volume flow corresponding to the maximum leakage percentage can be calculated
using equation (3) in clause 7.6.2.
d
For seat tightness class H, testing shall be conducted to verify the seat tightness specified in the technical literature.
The required seat tightness class depends on the intended application of the valve:
a) Valves leading to the atmosphere permanently shall be seat tightness class A.
b) Valves leading to the atmosphere during service shall be seat tightness class A or B.
c) For other valves, seat tightness classes with lower requirements are allowed.
NOTE 1 Components with several valve seats, may have several seat tightness classes.
NOTE 2 Safety valves are examples of valves where seat tightness class A is required, while most stop valves
will require seat tightness classes A or B.
For manually closed valves, when testing the seat tightness, the seat shall be closed before the test
applying the prescribed closing force.
For valves of the double seating type such as many gate, plug, and ball valves, the test pressure shall be
applied successively to each end of the closed valve and tightness to the opposite end checked.
As alternate methods for valves with independent double seating (such as double disc or split wedge
gate valves), at the option of the manufacturer, the pressure may be applied inside the bonnet (or
body) of the closed valve and each seat checked for tightness at the valve ports, or the pressure may
be applied to the valve ports and the sum of seat leakage measured at the bonnet (or body). These
alternate methods may be used at the option of the manufacturer for valves with single discs (such as
solid or flexible wedge gate valves) provided a supplementary closure member test across the disc is
performed.
For other valve types, the test pressure shall be applied across the closure member in the direction
producing the most adverse seating condition. For example, a globe valve shall be tested with pressure
under the disc. A check valve, or other valve type designed, sold, and marked as a one-way valve,
requires a closure test only in the appropriate direction. A stop check valve requires both tests.
7.6.2 Seat tightness: type test
The leakage percentage L is specified for the flow directions for which the valve is designed to shut off
the flow.
The manufacturer shall
...
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