EN ISO 17871:2020/FprA2
(Amendment)Gas cylinders - Quick-release cylinder valves - Specification and type testing - Amendment 2 (ISO 17871:2020/FDAM 2:2026)
- Status
- Not Published
- Publication Date
- 25-Jan-2027
- Technical Committee
- CEN/TC 23 - Transportable gas cylinders
- Drafting Committee
- CEN/TC 23/WG 20 - Cylinder design - Fittings
- Current Stage
- 5020 - Submission to Vote - Formal Approval
- Start Date
- 03-Sep-2026
- Completion Date
- 03-Sep-2026
EN ISO 17871:2020/FprA2 is CEN’s draft Amendment 2 to the gas cylinder standard for quick-release cylinder valves. It updates the specification and type-testing rules for these valves, with changes to scope wording, reference editions, leakage and hydraulic test requirements, and marking. Manufacturers, test laboratories, quality teams, and buyers of valve assemblies use it to check how quick-release cylinder valves are specified and verified.
What does EN ISO 17871:2020/FprA2 specify?
EN ISO 17871:2020/FprA2 specifies targeted amendments to the existing quick-release cylinder valve standard. The amendment keeps the document focused on the valve’s closure function, and it updates the clauses that control conformity, testing, and marking.
It revises Clause 1, Clause 2, Clause 4.1 to 4.2.11, Clause 5, and Annex A references. In practice, that means the amendment changes how the base standard points to related standards and how several tests and marks are applied.
| Part of the amendment | What it covers |
|---|---|
| Clause 1 | Scope wording and application notes |
| Clause 2 | Updated referenced standards |
| Clause 4.1 to 4.2.11 | Technical requirements and test conditions |
| Clause 5 | Marking rules |
| Annex A references | Test method cross-references |
What are the key requirements of EN ISO 17871:2020/FprA2?
EN ISO 17871:2020/FprA2 mainly tightens how quick-release cylinder valves are linked to other valve standards, which tests apply, and what has to be marked on the product. The practical effect is that manufacturers must align design verification and type testing with the updated reference editions and the special cases listed in the amendment.
- Scope is limited to the closure function - Clause 1 says the document covers the valve as a closure only. If a valve includes other functions, those functions are handled by other standards, but they are not requirements of this document. That matters when a product combines closure with filling or control features.
- Updated reference standards apply - Clause 2 and Clause 4.1 replace references to earlier editions with ISO 10297:2024 and ISO 17879:2026, and keep ISO 23826 where applicable. This means conformity checking must use the current editions named in the amendment.
- General conformity is based on the named companion standards - Clause 4.1 says quick-release cylinder valves shall meet ISO 10297, ISO 17879, or ISO 23826, except where this document gives different or extra requirements. In practice, the valve maker must check both the base standard and the quick-release-specific differences.
- Leakage and endurance testing are adjusted - Clause 4.2.5 sets the total external leakage limit at 12 cm3/h when that test is performed, and Clause 4.2.10 says some internal and transport/storage leak-tightness tests are not needed in specific cases. This affects the test plan and can reduce unnecessary testing for certain valve designs.
- Special rules apply to fixed fire-fighting systems and type A valves - Clause 4.2.10 gives exemptions for quick-release cylinder valves used only in covered fixed fire-fighting systems at low temperature, and it exempts type A valves from internal and external leak-tightness tests before the endurance test. This matters for qualification because the test sequence depends on the end use and valve type.
- Hydraulic testing is clarified - Clause 4.2.7 and Clause 4.2.9 rename the hydraulic tests and require evidence that the valve body can withstand the relevant pressure, with p_vht calculated for extinguishing agents charged with compressed gases. The maker has to show structural strength, not just functional operation.
- Marking must be permanent and legible - Clause 5 requires marking before service by forging, etching, hard metal stamping, engraving, pin stamping, laser etching, or an equivalent method, and excludes adhesive labels. For users, that means the valve identity and key data must survive service conditions.
What terms does EN ISO 17871:2020/FprA2 define?
- Quick-release cylinder valve - A cylinder valve designed for rapid opening and closing in gas cylinder service.
- Residual pressure valve (RPV) - A valve type mentioned as having additional requirements in ISO 15996.
- Filling connection non-return valve - A non-return valve in a separated filling connection that must meet specific endurance requirements.
- Type A - A quick-release valve design category that is treated differently in the leak-tightness testing clauses.
- Intermittent discharge - An operating case that triggers a specific internal leak-tightness test at the higher test pressure.
- p_vht - The hydraulic pressure test value used in the amended hydraulic strength requirements.
Who uses EN ISO 17871:2020/FprA2?
EN ISO 17871:2020/FprA2 is used by valve manufacturers, cylinder manufacturers, and test laboratories that perform type testing for gas cylinders. It is also relevant to quality managers, certification bodies, and regulators who need to check whether a quick-release cylinder valve meets the current technical conditions.
It is especially relevant in gas cylinder applications, pressure equipment work, and fixed fire-fighting systems. The amendment also matters to buyers and integrators because it affects what must be tested, what can be exempted, and what must be marked on the valve.
What changed in EN ISO 17871:2020/FprA2 from the previous edition?
Compared with the previous referenced editions, EN ISO 17871:2020/FprA2 updates the cross-references to ISO 10297:2024 and ISO 17879:2026. It also:
- Narrows the scope note to the closure function only
- Adds a note pointing to extra requirements for fixed fire-fighting systems and residual pressure valves
- Revises several leakage test conditions and exemptions
- Clarifies hydraulic test wording and pressure symbols
- Tightens marking language and removes adhesive labels as a permitted marking method
- Updates Annex A references and removes the “at normal temperature and pressure (NTP)” wording in A.2.2
Which standards are used with EN ISO 17871:2020/FprA2?
EN ISO 17871:2020/FprA2 points to several companion standards for detailed requirements and test methods:
- ISO 10297:2024 - general cylinder valve requirements and test procedures used throughout the amendment
- ISO 17879:2026 - alternative cylinder valve requirements and test procedures used where applicable
- ISO 23826:2021 - another applicable valve standard referenced for alternative requirements and tests
- ISO 16003 - additional requirements for quick-release cylinder valves in fixed fire-fighting systems
- EN 12094-4 - regional requirements for that same fire-fighting application
- ISO 15996 - additional requirements for residual pressure valves (RPV)
What does the EN ISO 17871:2020/FprA2 document contain?
This amendment contains clause-by-clause updates rather than a full rewrite of the standard. The technical content centers on scope wording, updated cross-references, leakage test conditions, hydraulic test terminology, and marking rules.
It also points to specific test tables and procedures in ISO 10297:2024, ISO 17879:2026, and ISO 23826:2021. For certification and type testing, the document tells readers which checks still apply, which checks are waived in special cases, and how to document valve identity and test compliance.
Relations
- Consolidated By
ISO 17871:2020/FDAmd 2 - Gas cylinders — Quick-release cylinder valves — Specification and type testing — Amendment 2 - Effective Date
- 12-Feb-2026
- Effective Date
- 05-Jun-2024
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Frequently Asked Questions
EN ISO 17871:2020/FprA2 is a draft published by the European Committee for Standardization (CEN). Its full title is "Gas cylinders - Quick-release cylinder valves - Specification and type testing - Amendment 2 (ISO 17871:2020/FDAM 2:2026)". This standard covers: Gas cylinders - Quick-release cylinder valves - Specification and type testing - Amendment 2 (ISO 17871:2020/FDAM 2:2026)
Gas cylinders - Quick-release cylinder valves - Specification and type testing - Amendment 2 (ISO 17871:2020/FDAM 2:2026)
EN ISO 17871:2020/FprA2 is classified under the following ICS (International Classification for Standards) categories: 23.020.35 - Gas cylinders; 23.060.40 - Pressure regulators. The ICS classification helps identify the subject area and facilitates finding related standards.
EN ISO 17871:2020/FprA2 has the following relationships with other standards: It is inter standard links to ISO 17871:2020/FDAmd 2, EN ISO 17871:2020. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN ISO 17871:2020/FprA2 is associated with the following European legislation: EU Directives/Regulations: 2008/68/EC; Standardization Mandates: M/TDG. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
EN ISO 17871:2020/FprA2 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 17871:2020/oprA2:2026
01-marec-2026
Plinske jeklenke - Ventili jeklenk za hitro razbremenitev - Specifikacija in
preskušanje tipa - Dopolnilo A2 (ISO 17871:2020/DAM 2:2026)
Gas cylinders - Quick-release cylinder valves - Specification and type testing -
Amendment 2 (ISO 17871:2020/DAM 2:2026)
Gasflaschen - Schnellöffnungs-Flaschenventile - Spezifikation und Baumusterprüfung -
Änderung 2 (ISO 17871:2020/DAM 2:2026)
Bouteilles à gaz - Robinets de bouteilles à ouverture rapide - Spécifications et essais de
type - Amendement 2 (ISO 17871:2020/DAM 2:2026)
Ta slovenski standard je istoveten z: EN ISO 17871:2020/prA2
ICS:
23.020.35 Plinske jeklenke Gas cylinders
23.060.40 Tlačni regulatorji Pressure regulators
SIST EN ISO 17871:2020/oprA2:2026 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
SIST EN ISO 17871:2020/oprA2:2026
SIST EN ISO 17871:2020/oprA2:2026
DRAFT
Amendment
ISO 17871:2020/
DAM 2
ISO/TC 58/SC 2
Gas cylinders — Quick-release
Secretariat: AFNOR
cylinder valves — Specification and
type testing
Voting begins on:
2026-01-15
AMENDMENT 2
Voting terminates on:
2026-04-09
Bouteilles à gaz — Robinets de bouteilles à ouverture rapide —
Spécifications et essais de type
AMENDEMENT 2
ICS: 23.020.35
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
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.
Reference number
ISO 17871:2020/DAM 2:2026(en)
SIST EN ISO 17871:2020/oprA2:2026
DRAFT
ISO 17871:2020/DAM 2:2026(en)
Amendment
ISO 17871:2020/
DAM 2
ISO/TC 58/SC 2
Gas cylinders — Quick-release
Secretariat: AFNOR
cylinder valves — Specification and
type testing
Voting begins on:
AMENDMENT 2
Voting terminates on:
Bouteilles à gaz — Robinets de bouteilles à ouverture rapide —
Spécifications et essais de type
AMENDEMENT 2
ICS: 23.020.35
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
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BE CONSIDERED IN THE LIGHT OF THEIR
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POTENTIAL TO BECOME STANDARDS TO
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or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
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TO SUBMIT, WITH THEIR COMMENTS,
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NOTIFICATION OF ANY RELEVANT PATENT
Phone: +41 22 749 01 11
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO 17871:2020/DAM 2:2026(en)
ii
SIST EN ISO 17871:2020/oprA2:2026
ISO 17871:2020/DAM 2:2026(en)
Foreword
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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
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This document was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 2,
Cylinder valves.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iii
SIST EN ISO 17871:2020/oprA2:2026
SIST EN ISO 17871:2020/oprA2:2026
ISO 17871:2020/DAM 2:2026(en)
Gas cylinders — Quick-release cylinder valves — Specification
and type testing
AMENDMENT 2
1 Scope, paragraph after NOTE 2
Replace the paragraph with the following paragraph:
“This document only covers the function of a quick-release cylinder valve as a closure. Other functions that
are possibly integrated in the valve can be covered by other standards. Such standards do however not
constitute requirements according to this document.”
1 Scope, new NOTE 3
Add the following Note at the end of clause 3:
“NOTE 3 Certain specific requirements for quick-release cylinder valves for fixed fire-fighting systems
in addition to those that are given in this document are specified in ISO 16003 and at a regional level, e.g. in
EN 12094–4. Certain specific requirements for residual pressure valves (RPV), in addition to those that are
given in this document, are given in ISO 15996.”
2 Reference to ISO 10297 and ISO 17879
Substitute “ISO 10297:2014+Amd1:2017” with “ISO 10297:2024” and “ISO 17879:2017” with “ISO 17879:2026”.
4.1 First paragraph
Substitute the first paragraph with the following paragraph:
“Quick-release cylinder valves shall comply with all requirements of ISO 10297, ISO 17879 or ISO 23826
(except Clause 8), as applicable, unless this document expressly allows differing requirements or stipulates
additional requirements.”
4.1 Last paragraph
Substitute “ISO 10297:2014+Amd1:2017, 5.2” with “ISO 10297:2024, 5.2” and “ISO 17879:2017, 5.2” with
“ISO 17879:2026, 5.2”.
4.2.1 First paragraph
Substitute the first para
...