Gas cylinders - Self-closing cylinder valves - Specification and type testing (ISO 17879:2017)

ISO 17879:2017 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.
ISO 17879:2017 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.
ISO 17879:2017 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.

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)

ISO 17879:2017 spécifie les exigences relatives à la conception, aux essais de type, au marquage, ainsi qu'aux essais et examens en cours de fabrication, pour les robinets de bouteilles équipés de clapets auto-obturants destinés à être montés sur des bouteilles à gaz transportables et rechargeables qui sont conçues pour transporter des gaz comprimés, liquéfiés ou dissous.
NOTE 1       Les applications principales de ces robinets de bouteilles équipés de clapets auto-obturants sont les gaz d'étalonnage et le secteur des boissons.
ISO 17879:2017 couvre la fonction d'un robinet de bouteille équipé d'un clapet auto-obturant en tant que dispositif de fermeture.
NOTE 2       Les exigences relatives aux robinets de bouteilles normalisés sont fournies dans l'ISO 10297. Les exigences relatives aux robinets de bouteilles à ouverture rapide sont fournies dans l'ISO 17871.
ISO 17879:2017 ne s'applique pas aux robinets de bouteilles équipés de clapets auto-obturants utilisés sur des équipements cryogéniques, sur des extincteurs d'incendie portatifs ou sur des équipements transportant du gaz de pétrole liquéfié (GPL).
NOTE 3       Les exigences portant sur les robinets pour récipients cryogéniques sont spécifiées dans l'ISO 21011 et, au niveau régional, par exemple dans l'EN 1626. Les exigences portant sur les robinets pour extincteurs d'incendie portatifs au niveau régional sont spécifiées, par exemple, dans la série EN 3. Les exigences relatives aux robinets de bouteilles de GPL équipés de clapets auto-obturants sont spécifiées dans l'ISO 14245.
NOTE 4       Pour les dispositifs limiteurs de pression, des exigences supplémentaires peuvent être spécifiées dans les normes ou dans les règlements internationaux/régionaux.

Plinske jeklenke - Samozaporni ventili za plinske jeklenke - Specifikacija in preskus tipa (ISO 17879:2017)

Ta dokument določa projektiranje, tipsko preskušanje, označevanje in proizvodne preskuse ter zahteve za preglede za samozaporne ventile jeklenk, ki so predvideni za namestitev na prenosne plinske jeklenke, ki jih je mogoče znova napolniti in so z njimi prenašani stisnjeni, utekočinjeni ali raztopljeni plini.
OPOMBA 1: Tovrstni samozaporni ventili jeklenk se uporabljajo predvsem v industriji za kalibracijski plin in tekočine.
Ta dokument zajema funkcijo samozapornega ventila jeklenke kot zapore.
OPOMBA 2: Zahteve za standardne ventile za jeklenke so podane v standardu ISO 10297. Zahteve za ventile za hitro sprostitev za jeklenke so navedene v standardu ISO 17871.
Ta dokument se ne uporablja za samozaporne ventile jeklenk za kriogensko opremo, prenosne gasilnike ali utekočinjeni naftni plin (LPG).
OPOMBA 3: Zahteve za ventile kriogenskih posod so določene v standardu ISO 21011 in na regionalni ravni, npr. v standardu EN 1626. Zahteve za ventile za prenosne gasilnike na regionalni ravni so določene npr. v skupini EN 3. Zahteve za samozaporne ventile jeklenk LPG so določene v standardu ISO 14245.
OPOMBA 4: Dodatne zahteve za naprave za razbremenitev tlaka so morda določene v mednarodnih/regionalnih
predpisih/standardih.

General Information

Status
Published
Publication Date
08-Aug-2017
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
09-Aug-2017
Completion Date
09-Aug-2017

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SLOVENSKI STANDARD
SIST EN ISO 17879:2018
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
SIST EN ISO 17879:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 17879:2018
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SIST EN ISO 17879:2018
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.
---------------------- Page: 3 ----------------------
SIST EN ISO 17879:2018
EN ISO 17879:2017 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 17879:2018
EN ISO 17879:2017 (E)
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.

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SIST EN ISO 17879:2018
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SIST EN ISO 17879:2018
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
---------------------- Page: 7 ----------------------
SIST EN ISO 17879:2018
ISO 17879:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
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SIST EN ISO 17879:2018
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 2017 – All rights reserved iii
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SIST EN ISO 17879:2018
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
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SIST EN ISO 17879:2018
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.
© ISO 2017 – All rights reserved v
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SIST EN ISO 17879:2018
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SIST EN ISO 17879:2018
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 2017 – All rights reserved 1
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SIST EN ISO 17879:2018
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

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
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
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
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SIST EN ISO 17879:2018
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 2017 – All rights reserved 3
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SIST EN ISO 17879:2018
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
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SIST EN ISO 17879:2018
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;

— 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 2017 – All rights reserved 5
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SIST EN ISO 17879:2018
ISO 17879:2017(E)
The valve filling co
...

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