SIST EN ISO 17879:2018

SLOVENSKI STANDARD
01-maj-2018
Plinske jeklenke - Samozaporni ventili za plinske jeklenke - Specifikacija in
preskus tipa (ISO 17879:2017)
Gas cylinders - Self-closing cylinder valves - Specification and type testing (ISO
17879:2017)
Gasflaschen - Selbstschließende Flaschenventile - Spezifikation und Baumusterprüfung
(ISO 17879:2017)
Bouteilles à gaz - Robinets de bouteilles équipés de clapets auto-obturants -
Spécifications et essais de type (ISO 17879:2017)
Ta slovenski standard je istoveten z: EN ISO 17879:2017
ICS:
23.020.35 Plinske jeklenke Gas cylinders
23.060.40 7ODþQLUHJXODWRUML Pressure regulators
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 17879
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2017
EUROPÄISCHE NORM
ICS 23.020.35
English Version
Gas cylinders - Self-closing cylinder valves - Specification
and type testing (ISO 17879:2017)
Bouteilles à gaz - Robinets de bouteilles équipés de Gasflaschen - Selbstschließende Flaschenventile -
clapets auto-obturants - Spécifications et essais de type Spezifikation und Baumusterprüfung (ISO
(ISO 17879:2017) 17879:2017)
This European Standard was approved by CEN on 26 June 2017.

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. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17879:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 17879:2017) has been prepared by Technical Committee ISO/TC 58 “Gas
cylinders” in collaboration with Technical Committee CEN/TC 23 “Transportable gas cylinders” the
secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by February 2018, and conflicting national standards
shall be withdrawn at the latest by February 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 17879:2017 has been approved by CEN as EN ISO 17879:2017 without any modification.
INTERNATIONAL ISO
STANDARD 17879
First edition
2017-07
Gas cylinders — Self-closing cylinder
valves — Specification and type testing
Bouteilles à gaz — Robinets de bouteilles équipés de clapets auto-
obturants — Spécifications et essais de type
Reference number
ISO 17879:2017(E)
©
ISO 2017
ISO 17879:2017(E)
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, 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 on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
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Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

ISO 17879:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Valve description . 3
5 Valve design requirements . 4
5.1 General . 4
5.2 Materials . 4
5.3 Valve connections . 5
5.4 Mechanical strength . 6
5.4.1 Resistance to hydraulic burst pressure . 6
5.4.2 Resistance to mechanical damage . 6
5.5 Valve operating mechanism . 6
5.6 Leakage . 6
5.7 Resistance to ignition . 7
5.8 Resistance to acetylene flashback . 7
5.9 Manufacturing tests and examinations . 7
6 Type testing. 8
6.1 General . 8
6.2 Documentation . 9
6.3 Test samples . 9
6.4 Test report .10
6.5 Test temperatures .10
6.6 Test pressures .10
6.6.1 Valve burst test pressure .10
6.6.2 Valve test pressure .10
6.7 Test gases .11
6.7.1 Gas quality .11
6.7.2 Leak tightness tests .11
6.7.3 Endurance test .11
6.7.4 Oxygen pressure surge test.11
6.8 Test schedule .11
6.9 Hydraulic burst pressure test .13
6.10 Leak tightness tests .13
6.10.1 General.13
6.10.2 Internal leak tightness test . .13
6.10.3 External leak tightness test.14
6.11 Endurance test .14
6.12 Visual examination .15
7 Marking .15
Annex A (normative) Mechanical strength tests .16
Annex B (normative) Acetylene tests .19
Annex C (normative) Oxygen pressure surge test .20
Annex D (normative) Manufacturing tests and examinations .21
Bibliography .22
ISO 17879:2017(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: w w w . i s o .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 2,
Cylinder fittings.
iv © ISO 2017 – All rights reserved

ISO 17879:2017(E)
Introduction
This document covers the function of a self-closing cylinder valve as a closure (defined by the UN Model
Regulations). Additional features of self-closing cylinder valves (e.g. pressure relief devices) might be
covered by other standards and/or regulations.
Self-closing cylinder valves conforming to this document can be expected to perform satisfactorily
under normal service conditions.
This document pays particular attention to:
a) suitability of materials;
b) safety (mechanical strength, impact strength, endurance, leak tightness, resistance to ignition,
resistance to acetylene flashback);
c) testing;
d) marking;
e) manufacturing tests and examinations.
In this document, the unit bar is used due to its universal use in the field of technical gases. It should,
however, be noted that bar is not an SI unit, and that the corresponding SI unit for pressure is Pa
5 5 2
(1 bar = 10 Pa = 10 N/m ).
Pressure values in this document are given as gauge pressure (pressure exceeding atmospheric
pressure) unless noted otherwise.
INTERNATIONAL STANDARD ISO 17879:2017(E)
Gas cylinders — Self-closing cylinder valves —
Specification and type testing
1 Scope
This document specifies the design, type testing, marking and manufacturing tests and examinations
requirements for self-closing cylinder valves intended to be fitted to refillable transportable gas
cylinders which convey compressed, liquefied or dissolved gases.
NOTE 1 The main applications for such self-closing cylinder valves are in the calibration gas and beverage
industries.
This document covers the function of a self-closing cylinder valve as a closure.
NOTE 2 Requirements for standard cylinder valves are given in ISO 10297. Requirements for quick-release
cylinder valves are given in ISO 17871.
This document is not applicable to self-closing cylinder valves for cryogenic equipment, for portable fire
extinguishers, or for liquefied petroleum gas (LPG).
NOTE 3 Requirements for valves for cryogenic vessels are specified in ISO 21011 and at a regional level, for
example, in EN 1626. Requirements for valves for portable fire extinguishers at a regional level are specified, for
example, in EN 3 series. Requirements for self-closing LPG cylinder valves are specified in ISO 14245.
NOTE 4 Additional requirements for pressure-relief devices might be specified in international/regional
regulations/standards.
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.
ISO 10286, Gas cylinders — Terminology
ISO 10297:2014, Gas cylinders — Cylinder valves — Specification and type testing
ISO 10524-3, Pressure regulators for use with medical gases — Part 3: Pressure regulators integrated with
cylinder valves
ISO 11114-1, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1:
Metallic materials
ISO 11114-2, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 2:
Non-metallic materials
ISO 13341, Gas cylinders — Fitting of valves to gas cylinders
ISO 14246, Gas cylinders — Cylinder valves — Manufacturing tests and examinations
ISO 22435, Gas cylinders — Cylinder valves with integrated pressure regulators — Specification and
type testing
3 Terms and definitions
For the purposes of this document, the terms and definitions in ISO 10286 and the following apply.
ISO 17879:2017(E)
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
self-closing cylinder valve
cylinder valve with a normally closed valve operating mechanism (3.2) that is actuated by a separate
operating device (3.3) which is not an integral part of the cylinder valve
3.2
valve operating mechanism
mechanism which opens the valve orifice by an operating device (3.3) and closes automatically when or
before the operating device is disconnected and which includes the internal sealing system
3.3
operating device
external component which actuates the valve operating mechanism (3.2)
EXAMPLE Push-pin as part of a regulator, lever-operated push-pin.
3.4
external leak tightness
leak tightness to atmosphere when the valve is open
Note 1 to entry: Some designs of self-closing valves cannot leak externally except through the outlet connection.
3.5
internal leak tightness
leak tightness to atmosphere when the valve is closed and pressurized from the inlet
3.6
valve working pressure
p
w
settled pressure of a compressed gas at a uniform reference temperature of 15 °C in a full gas cylinder
for which the valve is intended
Note 1 to entry: This definition does not apply to liquefied gases (e.g. carbon dioxide) or dissolved gases (e.g.
acetylene).
Note 2 to entry: The valve working pressure is expressed in bar.
3.7
valve burst test pressure
p
vbt
minimum pressure applied to a valve during hydraulic burst pressure test
Note 1 to entry: The valve burst test pressure is expressed in bar.
3.8
valve test pressure
p
vt
minimum pressure applied to a valve during testing
Note 1 to entry: The valve test pressure is expressed in bar.
3.9
total package mass
combined mass of a gas cylinder, its valve(s), its permanent attachment(s) and its maximum allowed
gas content
Note 1 to entry: Valve guards but not valve protection caps are examples of permanent attachments.
2 © ISO 2017 – All rights reserved

ISO 17879:2017(E)
Note 2 to entry: The total package mass is expressed in kg.
3.10
valve inlet connection
connection on the valve which connects the valve to the cylinder
3.11
valve outlet connection
connection on the valve used to discharge the cylinder
Note 1 to entry: For most valves, this connection is also used for filling the cylinder.
3.12
valve filling connection
connection on the valve used to fill the cylinder
Note 1 to entry: For some valves, the valve filling connection is different from the valve outlet connection.
3.13
normal temperature and pressure
NTP
temperature of 20,0 °C (293,15 K) and pressure of 1,013 bar absolute (0,101 3 MPa absolute)
4 Valve description
4.1 A self-closing valve typically comprises a:
a) valve body;
b) valve operating mechanism;
c) valve outlet connection(s);
d) valve inlet connection.
4.2 Valves can also include:
a) a pressure-relief device;
NOTE Some transport regulations require or forbid pressure relief devices for some gases, gas mixtures
or gas groups.
b) a dip tube;
c) an outlet connection plug/cap;
d) an excess flow device;
e) a flow restricting orifice;
f) a filter(s).
ISO 17879:2017(E)
4.3 Typical designs are given in Figure 1.
Key
1 poppet
2 valve body
3 seat insert/soft seal
4 seat closing spring
Figure 1 — Typical self-closing cylinder valve designs
5 Valve design requirements
5.1 General
Valves shall operate within specification and be leak tight over a range of service temperatures, from at
least −20 °C to +65 °C in indoor and outdoor environments.
Closed valves shall be internally leak tight during transport and storage (see test 4 in Table 2) for
temperatures down to −40 °C.
Where higher or lower service temperatures are required, any additional requirements and tests shall
be agreed between the manufacturer and purchaser.
5.2 Materials
Metallic and non-metallic materials in contact with the gas shall be chemically and physically compatible
with the gas, in accordance with ISO 11114-1 and ISO 11114-2, under all intended operating conditions.
For valves used for dissolved gases, the compatibility of the materials in contact with the solvent shall
also be considered. For valves used with gas mixtures, the compatibility of the gas wetted materials
with each component of the gas mixture shall be considered.
Copper alloys in contact with oxygen or other oxidizing gases or gas mixtures shall have a maximum
aluminium content of no more than 2,5 %.
4 © ISO 2017 – All rights reserved

ISO 17879:2017(E)
When using plated or coated components in gas wetted areas, the material compatibility of both
the plating/coating material and the substrate material shall be taken into account. In addition,
consideration should be given to avoid flaking or particle generation, especially for oxygen, other
oxidizing gases (as defined in ISO 10156) and gas mixtures containing oxygen or other oxidizing gases.
The material used for the valve body shall be of either:
a) a material not showing a ductile to brittle transition (e.g. copper alloys, austenitic stainless steels,
aluminium alloys and nickel alloys), or;
b) a ferritic material (e.g. carbon steel) having an impact value greater than 27 J at −40 °C when
submitted to the Charpy pendulum impact test as specified in ISO 148-1.
The ignition resistance of non-metallic materials, lubricants and adhesives used in the gas wetted
area of valves requiring oxygen pressure surge testing (see 5.7) should be considered (e.g. using an
appropriate test procedure such as ISO 11114-3 for auto ignition temperature (AIT) testing and
ISO 21010:2014, Annex C for oxygen pressure surge testing of materials). Non-metallic materials used
in oxygen wetted areas should have an AIT of at least 100 °C above the maximum service temperature
of the valve, tested at a pressure of at least 100 bar (see ISO 15001 or ASTM G63).
Lubricants used in the gas wetted area of valves for gases requiring oxygen pressure surge testing (see
5.7) shall either:
1) be rated for:
— at least p in cases of single gases, or;
vt
— a pressure not less than the corresponding oxygen partial pressure in case of gas mixtures
containing other oxidizing gases than air with a partial pressure greater than 30 bar, or;
NOTE This rated pressure is the maximum pressure at which the lubricant passed the oxygen pressure
surge test described in ISO 21010:2014, Annex C.
2) be permitted only if the corresponding valve passes the oxygen pressure surge test after being pre-
conditioned via the endurance cycling procedure but without subsequent leak tightness tests and
final visual examination being performed.
For medical and breathing applications, ISO 15001 should be considered, especially when selecting
materials to reduce the risk of toxic products of combustion/decomposition from non-metallic materials
including lubricants.
5.3 Valve connections
Valve inlet and outlet connections shall conform to the requirements of an International Standard,
other regional or national standards or proprietary designs that have been qualified to an acceptable
industry standard.
NOTE 1 International valve inlet connection standards are, for example, ISO 11363-1 and ISO 15245-1.
NOTE 2 International valve outlet connection standards are, for example, ISO 5145 and ISO 10692-1. A partial
compilation of regional and national standards is given in ISO/TR 7470.
NOTE 3 Qualification procedures for proprietary valve inlet connection designs are, for example, given in
ISO 10692-2.
NOTE 4 Qualification procedures for proprietary valve outlet connection designs are, for example, given in
CGA V-1.
If the valve filling connection is separate to the valve outlet connection and not equipped with a non-
return valve or isolating valve, it shall be provided with a pressure-tight device (e.g. a plug or cap which
can be operated or removed only by the use of a special tool). Where applicable, such a pressure-tight
device shall be designed to vent gas before becoming disengaged.
ISO 17879:2017(E)
The valve filling connection non-return valve, if fitted, shall conform to the relevant requirements of
ISO 22435 for industrial applications or ISO 10524-3 for medical applications.
NOTE 5 See ISO 5145 for examples of valve filling connections.
5.4 Mechanical strength
5.4.1 Resistance to hydraulic burst pressure
Valves shall withstand p (see 6.6.1) without permanent visible deformation or burst.
vbt
The hydraulic burst pressure test is specified in 6.9.
5.4.2 Resistance to mechanical damage
To ensure mechanical integrity, valves shall withstand an impact test according to A.1, except if
permanently protected. If the dimensions of a valve make this test impracticable, then the drop test
according to A.2 shall be carried out.
The valve shall not break off from the cylinder. Distortion due to impact/drop is permissible. The valve
shall be leak tight as specified in A.1 or A.2.
In addition, the test sample shall remain capable of being opened for emergency venting purposes by
using a simple tool (e.g. a pin) or the corresponding valve operating device.
5.5 Valve operating mechanism
5.5.1 The valve operating mechanism shall meet the requirements of 5.5.2 and 5.5.3.
5.5.2 It shall be possible to open and close the valve at pressures up to p (see 6.6.2) using equipment
vt
recommended by the manufacturer. This shall be verified during endurance test (see 6.11).
It should be designed in such a way that the setting of the operating position of the valve cannot be
inadvertently altered, i.e. if the valve is closed, it should remain closed during normal service or normal
transport.
5.5.3 The valve operating mechanism shall function satisfactorily after 2 000 opening and closing
cycles at p (see 6.6.2) without replacement of the sealing system.
vt
The endurance test is specified in 6.11.
After the endurance test and the subsequent leak tightness tests have been performed, a visual
examination shall be carried out to ensure that no components are displaced (no longer in the place
where it was installed), non-functional (e.g. broken) or missing.
The visual examination is specified in 6.12.
5.5.4 Valves for gases requiring oxygen pressure surge testing (see 5.7) should have a slow opening
characteristic curve to avoid rapid pressure surge. This can be achieved using flow limiting devices.
5.6 Leakage
The internal leakage shall not exceed 6 cm /h (except for valves for acetylene, see Annex B), corrected
to NTP over the range of pressures and temperatures specified in Table 2 and Table 3, with the valve
operating mechanism in the closed position.
NOTE The leakage of 6 cm /h is approximately 4 bubbles of 3,5 mm diameter per minute.
6 © ISO 2017 – All rights reserved

ISO 17879:2017(E)
The total external leakage [typically comprising that from the valve external sealing system, if existent
(see 3.4), plus e.g. pressure relief device, pressure indicating devices] shall not exceed 6 cm /h,
corrected to NTP over the range of pressures and temperatures specified in Table 2 and Table 3, with
the valve operating mechanism in the open position.
For pure or toxic gases, lower permitted leakage rates may be agreed upon between the manufacturer and
−7 3
customer. For electronic applications, the permitted leakage rates are typically 1 × 10 He atm cm /s.
The leak tightness tests are specified in 6.10.
5.7 Resistance to ignition
To verify resistance to ignition
...