EN ISO 10297:2014

SLOVENSKI STANDARD
01-oktober-2014
1DGRPHãþD
SIST EN ISO 10297:2006
Plinske jeklenke - Ventili za jeklenke - Specifikacija in preskus tipa (ISO
10297:2014)
Gas cylinders - Cylinder valves - Specification and type testing (ISO 10297:2014)
Gasflaschen - Flaschenventile - Spezifikation und Baumusterprüfungen (ISO
10297:2014)
Bouteilles à gaz - Robinets de bouteilles - Spécifications et essais de type (ISO
10297:2014)
Ta slovenski standard je istoveten z: EN ISO 10297:2014
ICS:
23.020.30 7ODþQHSRVRGHSOLQVNH Pressure vessels, gas
MHNOHQNH cylinders
23.060.40 7ODþQLUHJXODWRUML Pressure regulators
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 10297
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2014
ICS 23.060.40; 23.020.30 Supersedes EN ISO 10297:2006
English Version
Gas cylinders - Cylinder valves - Specification and type testing
(ISO 10297:2014)
Bouteilles à gaz - Robinets de bouteilles - Spécifications et Gasflaschen - Flaschenventile - Spezifikation und
essais de type (ISO 10297:2014) Baumusterprüfungen (ISO 10297:2014)
This European Standard was approved by CEN on 28 June 2014.

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, 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
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10297:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
This document (EN ISO 10297:2014) 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 January 2015, and conflicting national standards shall be withdrawn at
the latest by January 2015.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 10297:2006.
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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 10297:2014 has been approved by CEN as EN ISO 10297:2014 without any modification.
INTERNATIONAL ISO
STANDARD 10297
Third edition
2014-07-15
Gas cylinders — Cylinder valves —
Specification and type testing
Bouteilles à gaz — Robinets de bouteilles — Spécifications et essais de
type
Reference number
ISO 10297:2014(E)
©
ISO 2014
ISO 10297:2014(E)
© ISO 2014
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
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved

ISO 10297:2014(E)
Contents Page
Foreword .iv
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 2
4 Valve description . 6
5 Valve design requirements .11
5.1 General .11
5.2 Materials .12
5.3 Dimensions .12
5.4 Valve connections .13
5.5 Mechanical strength .14
5.6 Valve operating mechanism .14
5.7 Valve operating device .17
5.8 Leakage .17
5.9 Resistance to ignition .17
6 Type testing.18
6.1 General .18
6.2 Documentation .20
6.3 Test samples .20
6.4 Test report .20
6.5 Test temperatures .21
6.6 Test pressures .21
6.7 Test gases .21
6.8 Test schedule .22
6.9 Hydraulic burst pressure test .24
6.10 Flame impingement test .25
6.11 Excessive torque tests .25
6.12 Leak tightness tests .25
6.13 Endurance test .27
6.14 Visual examination .28
7 Marking .28
Annex A (normative) Impact test .30
Annex B (normative) Tests for acetylene valves .32
Annex C (normative) Oxygen pressure surge test .33
Annex D (informative) Example of test schedule .37
Annex E (informative) Example of a vacuum test
.................................................................................................................................38
Annex F (normative) Endurance test machine .39
Bibliography .41
ISO 10297:2014(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. 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. 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 meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT), see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 58, Gas cylinders, Subcommittee SC 2, Cylinder
fittings.
This third edition cancels and replaces the second edition (ISO 10297:2006), which has been technically
revised.
The main technical modifications are:
a) Scope: inclusion of main valves and valves with integrated pressure regulator (VIPR), exclusion of
quick-release valves, non-return valves and ball valves;
b) Terms, definitions and symbols: introduction of new definitions and adaptation of existing
definitions;
c) Valve description: new clause with figures and general description;
d) Valve design requirements:
1) General: inclusion of additional requirement of internal leak tightness at −40 °C during transport
and storage;
2) Materials: deletion of requirements already given in ISO 11114-1 and ISO 11114-2; deletion of
ageing sensitivity test for non-metallic materials; addition of requirement on ductility of valve
body material; addition of requirement on suitability of lubricants for valve test pressure;
3) Dimensions: deletion of requirement on bore of the valve with regard to flow requirement and
adaption of requirements for valves fitted with a valve protection cap according to ISO 11117;
4) Valve connections: addition of requirements for separate valve filling connection;
5) Resistance to mechanical impact: addition of requirement for impact testing valves protected
by a valve guard but fixed only to the valve, modification of acceptance criteria;
iv © ISO 2014 – All rights reserved

ISO 10297:2014(E)
6) Valve operating mechanism: inclusion of allowance to increase the endurance torque for some
valve designs and to adjust compressed packed valves during endurance testing; replacement of
acetylene flashback test by alternative tests without using acetylene and addition of acetylene
decomposition test for main valves; modification of acceptance criteria;
7) Valve operating device: addition of requirement on the handwheel diameter required to achieve
the minimum closing torque; modification of acceptance criteria for flame impingement test;
8) Resistance to ignition: addition of requirement of oxygen pressure surge testing for certain
cylinder valves for gas mixtures containing oxygen and other oxidizing gases and of detailed
information on acceptance criteria; addition of mandatory reference to oxygen pressure surge
test for VIPR specified in ISO 22435 or ISO 10524-3 and for cylinder valves with residual
pressure devices specified in ISO 15996;
e) Production requirements: deletion of all respective requirements but reference to ISO 14246 in
scope;
f) Type testing:
1) General: addition of requirements for repeating tests depending on applied changes for a valve
design;
2) Documentation: addition of detailed information on documentation required;
3) Test samples: addition of requirement to have pressure gauges/indicators fitted;
4) Test report: addition of detailed information required;
5) Test pressures: adaption of information on burst test pressure (former hydraulic test pressure);
6) Test gas: addition of requirement for using helium or hydrogen or an inert mixture of these
gases for the leak tightness tests for cylinder valves for helium and hydrogen and their mixtures;
extension of requirements on gas quality;
7) Test schedule: deletion of ageing as preconditioning and leak tightness test before ageing;
addition of internal leak tightness test at −40 °C after endurance test; adaption of oxygen
pressure surge test for cylinder valves with lubricants not rated for valve test pressure; listing
of impact test;
8) Hydraulic burst pressure test: addition of testing the valve in closed position;
9) Excessive torque tests: addition of requirement to carry out the test with the valve operating
device in place; differentiation between handwheel and key/toggle operated valves; extension
of tests with requirement of two additional test samples;
10) Leak tightness tests: reference to informative Annex E for an example of a vacuum test;
unification of the lower test pressure of 0,5 bar for all gases; implementation of internal leak
tightness test at −40 °C; addition of information on required position of the valve operating
mechanism for external leak tightness test; adaption of requirement for test order for all
required test pressures; adaption of requirement for changing and maintaining the different
test temperatures; adaption of requirement for minimum closing torque;
11) Endurance test: addition of requirement to carry out the test with the handwheel in place and
of description of procedure for increasing the endurance torque for some valve designs;
12) Visual examination: addition of separate sub-clause for visual examination with detailed
information on acceptance criteria;
13) Oxygen pressure surge test: information on test installation and test procedure transferred to
normative Annex C; addition of detailed information on determination of pressure rise time;
addition of divergent installation requirements for testing main valves; addition of detailed
information on acceptance criteria;
ISO 10297:2014(E)
14) Acetylene test: information transferred to normative Annex B;
15) Impact test: addition of information on the valving torque according to ISO 13341 to be
used; addition of subsequent hydraulic burst pressure test and internal leak tightness test;
modification of test procedure;
16) Marking: addition of requirement for marking cylinder valves oxygen pressure surge tested via
different connections and of detailed information on marking of valve inlet, valve outlet and
separate valve filling connections;
17) Example of test sequence: information transferred from informative Annex B to informative
Annex D and adaptation according to new requirements for valve designs and changes and
material specifications within a valve design;
18) Addition of informative Annex E, giving an example of a vacuum test;
19) Endurance test equipment and procedure: information transferred from normative Annex C to
normative Annex F.
g) full editorial rework.
vi © ISO 2014 – All rights reserved

ISO 10297:2014(E)
Introduction
This International Standard covers the function of a cylinder valve as a closure (defined by the UN Model
Regulations). Additional features of cylinder valves (e.g. pressure regulators, residual pressure devices,
non-return devices and pressure relief devices) might be covered by other standards and/or regulations.
Cylinder valves complying with this International Standard can be expected to perform satisfactorily
under normal service conditions.
This International Standard 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.
This standard has been written to be in conformity with the UN Model Regulations. When published
it will be submitted to the UN Sub Committee of Experts on the Transport of Dangerous Goods with a
request that it be included in the UN Model Regulations.
Where there is any conflict between this International Standard and any applicable regulation, the
regulation always takes precedence.
Considering the changes described in the Foreword, when a cylinder valve has been approved according
to the previous version of this International Standard the body responsible for approving the same
cylinder valve to this new edition should consider which tests need to be performed.
In this International Standard 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
5 5 2
Pa (1 bar = 10 Pa = 10 N/m ).
Pressure values given in this International Standard are given as gauge pressure (pressure exceeding
atmospheric pressure) unless noted otherwise.
INTERNATIONAL STANDARD ISO 10297:2014(E)
Gas cylinders — Cylinder valves — Specification and type
testing
1 Scope
This International Standard specifies design, type testing and marking requirements for:
a) cylinder valves intended to be fitted to refillable transportable gas cylinders;
b) main valves (excluding ball valves) for cylinder bundles;
c) cylinder valves or main valves with integrated pressure regulator (VIPR);
which convey compressed, liquefied or dissolved gases.
NOTE 1 Where there is no risk of ambiguity, cylinder valves, main valves and VIPR are addressed with the
collective term “valves” within this International Standard.
This International Standard covers the function of a valve as a closure.
This International Standard does not apply to
— valves for cryogenic equipment, portable fire extinguishers and liquefied petroleum gas (LPG), and
— quick-release valves (e.g. for fire-extinguishing, explosion protection and rescue applications), non-
return valves or ball valves.
NOTE 2 Requirements for valves for cryogenic vessels are specified in ISO 21011 and at a regional level e.g. in
EN 1626. Requirements for LPG valves are specified in ISO 14245 or ISO 15995. Requirements for quick-release
valves are specified e.g. in ISO 17871. Requirements for valves for portable fire extinguishers at a regional
level are specified e.g. in EN 3 series. Requirements for non-return valves and ball valves might be specified in
international/regional standards.
NOTE 3 Requirements for manufacturing tests and examinations of valves covered by this International
Standard are given in ISO 14246.
NOTE 4 Additional requirements for VIPR are specified in ISO 22435 for industrial applications or ISO 10524-3
for medical applications. Additional requirements for residual pressure valves with or without a non-return
function are specified in ISO 15996. Additional requirements for pressure-relief devices might be specified in
international/regional regulations/standards.
NOTE 5 Additional specific requirements for valves for breathing apparatus at a regional level are specified
e.g. in EN 144 series. Additional specific requirements for quick-release valves for fixed fire-fighting systems are
specified in ISO 16003 and at a regional level e.g. in EN 12094–4.
2 Normative references
The following referenced documents, in whole or in part, are normatively referenced in this document
and are indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
ISO 407, Small medical gas cylinders — Pin-index yoke-type valve connections
ISO 10286, Gas cylinders — Terminology
ISO 10297:2014(E)
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 11117:2008, Gas cylinders — Valve protection caps and valve guards — Design, construction and tests
ISO 13341, Gas cylinders — Fitting of valves to gas cylinders
ISO 15615:2013, Gas welding equipment — Acetylene manifold systems for welding, cutting and allied
processes — Safety requirements in high-pressure devices
ISO 15996, Gas cylinders — Residual pressure valves — General requirements and type testing
ISO 22435, Gas cylinders — Cylinder valves with integrated pressure regulators — Specification and type
testing
3 Terms, definitions and symbols
For the purposes of this document, the terms and definitions given in ISO 10286, and the following apply.
3.1
valve operating mechanism
mechanism which closes and opens the valve orifice and which includes the internal and external sealing
systems
Note 1 to entry: In ISO 22435 the valve operating mechanism is called shut-off mechanism.
Note 2 to entry: For some VIPR designs the pressure regulating valve can act as the shut-off mechanism.
EXAMPLE A threaded valve spindle which, when rotated, raises and lowers a seal/seat.
3.2
valve design
classification of valves with regard to the valve operating mechanism (3.1)
3.3
valve operating device
component which actuates the valve operating mechanism (3.1)
EXAMPLE Handwheel, key, knob, toggle, lever or actuator.
3.4
external leak tightness
leak tightness to atmosphere (leakage in and/or leakage out) when the valve is open
Note 1 to entry: See Figure 1.
2 © ISO 2014 – All rights reserved

ISO 10297:2014(E)
p < p p > p
a a
Key
1 valve outlet connection (sealed)
a
Leakage in (vacuum test)
b
Leakage out
p internal pressure
p atmospheric pressure
a
Figure 1 — External leak tightness
3.5
internal leak tightness
leak tightness across the valve seat (leakage in and/or leakage out) when the valve is closed
Note 1 to entry: See Figure 2.
ISO 10297:2014(E)
p < p p > p
a a
Key
1 valve outlet connection (open)
a
Leakage in (vacuum test).
b
Leakage out.
p internal pressure
p atmospheric pressure
a
Figure 2 — Internal leak tightness
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
or cylinder bundle 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.
4 © ISO 2014 – All rights reserved

ISO 10297:2014(E)
3.9
handwheel diameter
D
nominal value of twice the largest radius from the centre of the handwheel
Note 1 to entry: The handwheel diameter is expressed in mm.
3.10
minimum torque
T
c
torque necessary to be applied to a valve operating device (3.3) of a newly manufactured valve to obtain
internal leak tightness (3.5) at valve test pressure (3.8) and room temperature
Note 1 to entry: The minimum closing torque is expressed in Nm.
3.11
endurance torque
T
e
closing torque applied during the endurance test
Note 1 to entry: The endurance torque is expressed in Nm.
3.11.1
endurance torque at start
T
e,start
endurance torque (3.11) to be applied at the beginning of the endurance test
3.11.2
endurance torque at end
T
e,end
endurance torque (3.11) measured at the end of the endurance test to achieve internal leak tightness (3.5)
3.12
over torque
T
o
opening or closing torque (whichever is the lower value) applied to the valve operating device (3.3) to
determine the level of torque which the valve operating mechanism (3.1) can tolerate and remain operable
Note 1 to entry: The over torque is expressed in Nm.
3.13
failure torque
T
f
opening or closing torque (whichever is the lower value) applied to the valve operating device (3.3) to
obtain mechanical failure of the valve operating mechanism (3.1) and/or valve operating device (3.3)
Note 1 to entry: The failure torque is expressed in Nm.
3.14
total package mass
combined mass of a gas cylinder (including, for dissolved gases, any porous material and solvent), 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.
Note 2 to entry: The total package mass is expressed in kg.
3.15
main valve
valve which is fitted to a cylinder bundle’s manifold isolating it from the main connection(s)
ISO 10297:2014(E)
3.16
valve inlet connection
connection on the valve which connects the valve to the cylinder(s)
3.17
valve outlet connection
connection on the valve used to discharge the cylinder(s)
Note 1 to entry: For most valves this connection is also used for filling the cylinder(s).
3.18
valve filling connection
connection on the valve used to fill the cylinder(s)
Note 1 to entry: For some valves (e.g. VIPRs) the valve filling connection is different from the valve outlet
connection.
3.19
NTP
normal temperature and pressure
[SOURCE: 20,0 °C (293,15 K), 1,013 bar absolute (0,101 3 MPa absolute)]
4 Valve description
4.1 A valve typically comprises of:
a) valve body;
b) valve operating mechanism;
c) valve operating device;
d) means to ensure internal leak tightness;
e) means to ensure external leak tightness;
f) valve outlet connection(s);
g) valve inlet connection;
4.2 Valves can also include:
a) pressure-relief device;
NOTE The relevant transport regulation might require or forbid pressure relief devices for some gases,
gas mixtures or gas groups.
b) dip tube;
c) outlet connection plug/cap;
d) excess flow device;
e) non-return valve on the valve filling connection;
f) residual pressure device with or without non-return function;
g) pressure regulating device;
h) separate valve filling connection;
6 © ISO 2014 – All rights reserved

ISO 10297:2014(E)
i) flow restricting orifice;
j) filter(s).
4.3 Common valve designs are:
a) o-ring gland seal valves (see Figure 3);
b) diaphragm gland seal valves (see Figure 4);
c) compression packed gland seal valves (see Figure 5);
d) pressure seal valves (see Figure 6); and
e) reverse seated valves (see Figure 7).
1)
The valve designs shown in Figures 3 to 7 are given as typical examples, each with one sealing system
and one valve operating device only.
1) Figure 3 to Figure 7 © Compressed Gas Association (CGA). These figures are reproduced from CGA V-9—
2012, Compressed Gas Association Standard for Compressed Gas Cylinder Valves, with permission from the Compressed
Gas Association. All rights reserved.
ISO 10297:2014(E)
2)
A pin-index (post-type medical) valve (see Figure 8 ) is shown for illustration to identify unique
geometry in common medical gas cylinder applications.
Key
1 handwheel 1 handwheel retaining screw
2 handwheel retaining nut/stem nut 2 washer
3 upper spindle/upper stem 3 gland nut/bonnet
4 o-ring 4 diaphragms
5 seat insert 5 flow restrictor (when specified)
6 valve outlet connection 6 seat insert
7 valve inlet connection 7 pressure relief device
8 pressure relief device 8 body seat
9 body seat 9 seat opening spring
10 lower spindle/lower plug 10 lower spindle/lower plug
11 washer 11 upper spindle/upper stem
12 gland nut/bonnet 12 handwheel
Figure 3 — O-ring gland seal valve Figure 4 — Diaphragm gland seal valve
1) 1)
(non-metallic seal, handwheel operated) (non-metallic seal, handwheel operated)
2) Figure 8 © Compressed Gas Association (CGA). This figure is reproduced from CGA V-9—2012, Compressed
Gas Association Standard for Compressed Gas Cylinder Valves, with permission from the Compressed Gas Association.
All rights reserved.
8 © ISO 2014 – All rights reserved

ISO 10297:2014(E)
Key
1 spindle/valve stem, one-piece 1 handwheel retaining nut/stem nut
2 packings 2 pressure seal loading spring
3 cap nut/outlet seal cap 3 washer
4 outlet seal gasket 4 packings
5 valve inlet connection 5 upper spindle / upper stem
6 pressure relief device 6 tang
7 packing collar 7 valve outlet connection
8 packing gland 8 body seat
9 packing nut 9 valve inlet connection
10 pressure relief device
11 seat insert
12 lower spindle/lower plug
13 gland nut/bonnet
14 handwheel
ISO 10297:2014(E)
Key
1 seat insert
2 poppet
3 lever
4 o-ring
5 body seat
6 handle
7 valve inlet connection
8 seat closing spring
9 pressure relief device
10 gland nut/bonnet
11 valve outlet connection
12 diffuser
1)
Figure 7 — Reverse seated valve (non-metallic seal, lever operated)
10 © ISO 2014 – All rights reserved

ISO 10297:2014(E)
Key
1 toggle
2 upper spindle/upper stem
3 packings
4 lower spindle/lower plug
5 valve outlet connection
6 pin index holes
7 valve inlet connection
8 pressure relief device
9 body seat
10 seat insert
11 pressure seal loading spring
12 gland nut/bonnet
2)
Figure 8 — Pin-index (post-type medical) valve (non-metallic seal, toggle operated)
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 6 in Table 3) 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.
ISO 10297:2014(E)
5.2 Materials
Metallic and non-metallic materials in contact with the gas shall be chemically and physically compatible
with the gas, according to 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.
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 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.
Ignition resistance of non-metallic materials, lubricants and adhesives used in the gas wetted area of
valves requiring oxygen pressure surge testing (see 5.9) should be considered (e.g. using an appropriate
test procedure such as ISO 11114-3 for Auto Ignition Temperature (AIT) testing and ISO 21010:2004,
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 its maximum service temperature 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 5.9) 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 21010:2004, 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 Dimensions
For pin-index (post-type medical) valves in medical gas service (see Figure 8) the external dimensions
shall be in accordance with the requirements of ISO 407.
If the valve is intended to be protected by a valve protection cap, the valve dimensions shall be such that
the combination shall comply with the performance requirements of ISO 11117. For a valve to be used
with a valve protection cap according to ISO 11117:2008, Figure 1, its external dimensions shall comply
with the dimensions given in Figure 9.
12 © ISO 2014 – All rights reserved

ISO 10297:2014(E)
Key
r ≤ 32,5 mm h ≤ 90 mm
R ≤ 38 mm L ≤ 125 mm
R shall be measured to the part of the valve furthest from the valve stem axis and includes any valve outlet plugs or
caps if fitted
NOTE 1 h represents the length of the lower part of the valve when R is greater than r.
NOTE 2 L is the length of the valve in the closed position when not fitted to a cylinder.
NOTE 3 r relates to the axis of the valve inlet connection and not to the centreline of the valve operating device.
Figure 9 — Maximum dimensions for valves protected by a valve protection cap in accordance
with ISO 11117:2008, Figure 1
5.4 Valve connections
Valve inlet and outlet connections shall conform to 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 407, 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 10297:2014(E)
The valve filling connection non-return valve, if fitted, shall comply with 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.
5.5 Mechanical strength
5.5.1 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 given in 6.9.
5.5.2 Resistance to mechanical impact
Valves shall withstand a mechanical impact, if
a) used for cylinders with a water capacity greater than 5 l and not intended to be protected during
transport by
— a valve protection cap or a valve guard complying with ISO 11117, or
— other means;
NOTE Applicable transport regulations normally specify the variety of acceptable means.
b) used for cylinders of any water capacity where a valve guard is fixed only to the valve and not to the
cylinder. The valve shall be tested without the valve guard fitted.
NOTE For valves used in cylinders with a water capacity less than 5 l, transport regulations might still
require the valves to be inherently able to withstand damage without release of the contents or to be protected
during transport.
Main valves during transport are adequately protected by the frame of the cylinder bundle, e.g. tested
in accordance with ISO 10961; therefore no impact test is required.
Distortion due to impact is permissible
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