prEN 144-4

SLOVENSKI STANDARD
01-april-2026
Oprema za varovanje dihal - Ventili za plinske jeklenke - 4. del: Oprema za
omejevanje pretoka plina
Respiratory protective devices - Gas cylinder valves - Part 4: Excess flow devices
Atemschutzgeräte - Gasflaschenventile - Teil 4: Abströmsicherung
Appareils de protection respiratoire - Robinets de bouteilles à gaz - Partie 4 : Limiteurs
de débit
Ta slovenski standard je istoveten z: prEN 144-4
ICS:
13.340.30 Varovalne dihalne naprave Respiratory protective
devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2026
ICS 13.340.30
English Version
Respiratory protective devices - Gas cylinder valves - Part
4: Excess flow devices
Appareils de protection respiratoire - Robinets de Atemschutzgeräte - Gasflaschenventile - Teil 4:
bouteilles à gaz - Partie 4 : Limiteurs de débit Abströmsicherung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 79.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
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.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 144-4:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Requirements . 7
4.1 General. 7
4.2 Excess flow device – non activated state . 7
4.3 Excess flow device – activated state . 7
4.3.1 General. 7
4.3.2 Maximum flow . 7
4.3.3 Activation pressure . 8
4.4 Strength . 8
4.5 Lifespan . 8
4.6 Materials . 8
5 Testing . 8
5.1 General. 8
5.2 Maximum flow at 300 bar and activation pressure . 8
5.3 Strength . 8
5.3.1 Impact test . 8
5.3.2 Drop test . 9
5.4 Lifespan test . 9
5.4.1 Filling process – Excess flow device in non-activated state . 9
5.4.2 Activation cycle-– Activation test of the Excess Flow Device . 9
5.5 Visual inspections . 9
5.6 Test schedule . 9
6 Marking . 10
7 Information supplied by the manufacturer . 10
Annex A (informative) History/derivation of tests for Excess Flow Devices . 11
A.1 General. 11
A.2 Functional testing . 11
Annex B (normative) Flow and activation pressure . 12
B.1 Test equipment . 12
B.2 Test samples . 12
Annex C (normative) Drop test . 14
C.1 Test equipment . 14
C.2 Test samples . 14
Annex D (normative) Life test . 16
D.1 Test equipment. 16
D.2 Test samples . 16
D.3 Test procedure . 16

European foreword
This document (prEN 144-4:2026) has been prepared by Technical Committee CEN/TC 79 “Respiratory
protective devices”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.

Introduction
Respiratory protective device, among other things, of compressed gas cylinder(s) equipped with a valve,
can be equipped with excess flow devices as an additional component to increase safety in the event of
demolition or unintentional opening (see Annex A).

1 Scope
This document specifies the technical requirements and the necessary tests of Excess Flow Device (EFD)
for use with respiratory protective devices (RPD), up to 300 bar operating pressure.
Devices that only close the flow in the event of a valve break-off do not fall within the scope of this
document.
NOTE Throughout the breathing apparatus market exists a variety of cylinder valves that can have
different ways of connecting to an EFD. The interchangeability of the EFD is only possible in the case of
verified combinations of cylinder valve and EFD. The use of unverified combinations is not considered
safe.
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.
prEN 137, Respiratory protective devices — Self-contained open-circuit compressed air breathing
apparatus with full face mask — Requirements, testing, marking
EN 1146, Respiratory protective devices — Self-contained open-circuit compressed air breathing apparatus
incorporating a hood for escape — Requirements, testing, marking
EN 144-1:2018, Respiratory protective devices — Gas cylinder valves — Part 1: Inlet connections
EN 12021, Respiratory equipment — Compressed gases for breathing apparatus
EN ISO 10286, Gas cylinders — Vocabulary (ISO 10286)
EN ISO 11114-1, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1:
Metallic materials (ISO 11114-1)
EN ISO 11114-2, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 2:
Non-metallic materials (ISO 11114-2)
EN ISO 11117:2019, Gas cylinders — Valve protection caps and guards — Design, construction and tests
(ISO 11117:2019)
EN ISO 13341, Gas cylinders — Fitting of valves to gas cylinders (ISO 13341)
3 Terms and definitions
For the purposes of this document, the following terms given in EN ISO 10286 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
operating pressure
pressure that occurs after a complete filling of a breathable air cylinder at a uniform reference
temperature of 15 °C in bar
Note 1 to entry: Referred to as “nominal filling pressure” in prEN 137:2025 or also referred to as “filling pressure”.
3.2
Excess Flow Device (EFD)
device that limits the flow escaping from a compressed air cylinder, not connected to an RPD, when the
valve is suddenly opened or sheared off by accident
Note 1 to entry: Its function is to reduce the risk of the cylinder flying around or spinning thus becoming a risk for
the persons and the environment.
4 Requirements
4.1 General
An EFD shall be connected to the inlet thread of the valve. Both when filling and when extracting
breathing air f
...