SIST EN ISO 10297:2024

SLOVENSKI STANDARD
01-oktober-2024
Nadomešča:
SIST EN ISO 10297:2014
SIST EN ISO 10297:2014/A1:2018
Plinske jeklenke - Ventili za jeklenke - Specifikacija in preskus tipa (ISO
10297:2024, popravljena izdaja 2024-05)
Gas cylinders - Cylinder valves - Specification and type testing (ISO 10297:2024,
Corrected version 2024-05)
Gasflaschen - Flaschenventile - Spezifikation und Baumusterprüfungen (ISO
10297:2024, korrigierte Fassung 2024-05)
Bouteilles à gaz - Robinets de bouteilles - Spécifications et essais de type (ISO
10297:2024, Version corrigée 2024-05)
Ta slovenski standard je istoveten z: EN ISO 10297:2024
ICS:
23.020.35 Plinske jeklenke Gas cylinders
23.060.40 Tlačni regulatorji Pressure regulators
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 10297
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2024
EUROPÄISCHE NORM
ICS 23.060.40; 23.020.35 Supersedes EN ISO 10297:2014, EN ISO
10297:2014/A1:2017
English Version
Gas cylinders - Cylinder valves - Specification and type
testing (ISO 10297:2024)
Bouteilles à gaz - Robinets de bouteilles - Spécifications Gasflaschen - Flaschenventile - Spezifikation und
et essais de type (ISO 10297:2024) Baumusterprüfungen (ISO 10297:2024)
This European Standard was approved by CEN on 14 March 2024.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10297:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 10297:2024) 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 October 2024, and conflicting national standards shall
be withdrawn at the latest by October 2024.
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 supersedes EN ISO 10297:2014 and EN ISO 10297:2014/A1:2017.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 10297:2024 has been approved by CEN as EN ISO 10297:2024 without any modification.

International
Standard
ISO 10297
Fourth edition
Gas cylinders — Cylinder valves —
2024-04
Specification and type testing
Corrected version
Bouteilles à gaz — Robinets de bouteilles — Spécifications et
essais de type
2024-05
Reference number
ISO 10297:2024(en) © ISO 2024
ISO 10297:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 10297:2024(en)
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Valve description . 9
5 Valve design requirements . 16
5.1 General .16
5.2 Materials .16
5.3 Valve connections .17
5.4 Mechanical strength .18
5.4.1 Resistance to hydraulic pressure .18
5.4.2 Resistance to mechanical impact .18
5.4.3 Resistance to valve spindle impact for pin-index valves .19
5.5 Valve operating mechanism.19
5.5.1 Opening and closing of the valve.19
5.5.2 Endurance .19
5.5.3 Resistance to excessive torques . 20
5.5.4 Acetylene specific requirements . 22
5.6 Valve operating device. 22
5.6.1 Closing direction . 22
5.6.2 Handwheel diameter . 23
5.6.3 Exposure to flame . 23
5.7 Leakage . 23
5.8 Resistance to ignition .24
5.9 Flow capacity .24
6 Type testing .25
6.1 General . 25
6.2 Test schedule . 25
6.3 Documentation . 28
6.4 Test samples . 28
6.5 Test report . 29
6.6 Test temperatures . 29
6.7 Test pressures . 29
6.7.1 Valve hydraulic test pressure. 29
6.7.2 Valve test pressure . 29
6.8 Test gases. 30
6.8.1 Gas quality . 30
6.8.2 Leak tightness tests .31
6.8.3 Endurance tests . .31
6.8.4 Acetylene decomposition test .31
6.8.5 Oxygen pressure surge test .31
6.9 Hydraulic pressure test .31
6.10 Flame impingement test .32
6.11 Excessive torque tests .32
6.11.1 Handwheel operated valves .32
6.11.2 Key and toggle operated valves .32
6.11.3 VIPR type C with the flow selector acting as the primary valve operating
mechanism and VIPR type B .32
6.12 Leak tightness tests . 33
6.12.1 General . 33
6.12.2 Internal leak tightness test . 33
6.12.3 External leak tightness test . 34

iii
ISO 10297:2024(en)
6.13 Endurance test . 35
6.14 Endurance test of VIPR types B and C . 36
6.15 Endurance test of the filling connection non-return valve .37
6.15.1 Filling connection non-return valve downstream of the valve operating
mechanism .37
6.15.2 Filling connection non-return valve upstream of the valve operating mechanism .37
6.15.3 Test apparatus . 38
6.16 Visual examination . 38
6.17 Valve spindle impact test for pin-index valves . 39
6.18 Pressure relief valve tightness test . 39
7 Marking . .39
Annex A (normative) Impact test . 41
Annex B (normative) Tests for acetylene valves .43
Annex C (normative) Oxygen pressure surge test .45
Annex D (informative) Example of a vacuum test .52
Annex E (normative) Endurance test machine .53
Annex F (normative) Required tests for validation of changes and/or material variants within
a valve design .55
Bibliography .58

iv
ISO 10297:2024(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of 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 www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 2, Cylinder
fittings, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/
TC 23, Transportable gas cylinders, in accordance with the Agreement on technical cooperation between ISO
and CEN (Vienna Agreement).
This fourth edition cancels and replaces the third edition (ISO 10297:2014), which has been technically
revised. It also incorporates the Amendment ISO 10297:2014/Amd.1:2017.
The main changes are as follows:
— clarification of the Scope concerning different VIPR designs;
— addition of several new terms and definitions, e.g. VIPR types A, B and C for easy referencing of different
design types;
— oxygen pressure surge test:
— for VIPRs transferred from ISO 22435 and amended,
— for RPVs transferred from ISO 15996 and amended,
— reference for test equipment and procedure to ISO 11114-6,
— endurance test for specific VIPR designs transferred from ISO 22435 and amended;
— endurance test of the filling connection non-return valve transferred from ISO 22435 with clarification
of the test procedure without changes to the acceptance criteria;
— acetylene decomposition test of VIPR designs transferred from ISO 22435 and amended;
— subclause 5.3 "Dimensions" removed;
— introduction of Table 2 for giving the different leakage rates depending on the valve design;

v
ISO 10297:2024(en)
— Table 4 (former Table 3) of test schedule amended;
— introduction of recommendations for flow capacity values and reference to CGA V-9 for the respective
determination as an example;
— introduction of a valve spindle impact test for pin-index valves not permanently protected during
transport and use;
— introduction of the hydraulic pressure test also in the closed position for manually operated valves;
— introduction of an additional tightness test for pressure relief valves located upstream of the valve
operating mechanism;
— Annex D "Example of test schedule" removed;
— information on changes and/or material variants within a valve design moved to new Annex F and
amended.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
This corrected version of ISO 10297:2024 incorporates the following corrections:
— in 5.5.4.2, the first sentence has been modified to adjust to the criteria for the hydraulic pressure test
given in 5.4.1;
— in 6.4, third paragraph, the missing test number "no. 14" has been added;
— in Annex A, third paragraph, the alternative value "or 40 J" has been added for the impact energy used in
the impact test.
vi
ISO 10297:2024(en)
Introduction
This document has been written so that it is suitable to be referenced in the UN Model Regulations.
The term “pressure receptacle” is used within this document to cover instances where no differentiation is
necessary between gas cylinders, bundles of cylinders, pressure drums and tubes.
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 given in this document are given as gauge pressure (pressure exceeding atmospheric
pressure) unless noted otherwise.
Any tolerances given in this document include measurement uncertainties.

vii
International Standard ISO 10297:2024(en)
Gas cylinders — Cylinder valves — Specification and type testing
1 Scope
This document 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 bundles of cylinders;
c) cylinder valves or main valves with integrated pressure regulator (VIPR);
NOTE 1 This includes the following specific VIPR designs where:
1) The pressure regulating system is acting as the primary valve operating mechanism (VIPR type B).
This also includes designs where closure of the primary valve operating mechanism is obtained by closing the
seat of the pressure regulating mechanism.
2) The primary valve operating mechanism is located at the low-pressure side of the pressure regulating
system (VIPR type C).
d) valves for pressure drums and tubes;
which convey compressed, liquefied or dissolved gases.
NOTE 2 Where there is no risk of ambiguity, cylinder valves, main valves, VIPRs and valves for pressure drums and
tubes are addressed with the collective term “valves” within this document.
This document does not apply to
— valves for cryogenic equipment, portable fire extinguishers and liquefied petroleum gas (LPG);
— quick-release cylinder valves (e.g. for fire-extinguishing, explosion protection and rescue applications)
- requirements for quick-release cylinder valves are specified in ISO 17871 which contains normative
references to this document;
— self-closing cylinder valves and ball valves.
NOTE 3 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 self-closing cylinder
valves are specified in ISO 17879. Requirements for ball valves are specified in ISO 23826. Requirements for valves for
portable fire extinguishers at a regional level are specified, for example, in the EN 3 series.
This document only covers the function of a valve as a closure. Other functions that are possibly integrated
in the valve can be covered by other standards. Such standards do however not constitute requirements
according to this document.
NOTE 4 Definition of and specific requirements for VIPRs in addition to those that are given in this document are
specified in ISO 22435 for industrial applications or ISO 10524-3 for medical applications. Similarly, certain specific
requirements for residual pressure valves (RPV) with or without a non-return function in addition to those that are
given in this document are given in ISO 15996.
NOTE 5 Certain specific requirements for valves for breathing apparatus in addition to those that are given in
this document are specified at a regional level, for example, in the EN 144 series. Certain specific requirements for
quick-release valves for fixed fire-fighting systems in addition to those that are given in this document are specified in
ISO 16003 and at a regional level, for example, in EN 12094–4.
NOTE 6 Requirements for manufacturing tests and examinations of valves covered by this document are given in
ISO 14246.
ISO 10297:2024(en)
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 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
ISO 10286, Gas cylinders — Vocabulary
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 11114-6, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 6: Oxygen
pressure surge testing
ISO 11117, Gas cylinders — Valve protection caps and guards — Design, construction and tests
ISO/TR 11364, Gas cylinders — Compilation of national and international valve stem/gas cylinder neck threads
and their identification and marking system
ISO 13341, Gas cylinders — Fitting of valves to gas cylinders
ISO 15615:2022, Gas welding equipment — Acetylene manifold systems for welding, cutting and allied processes
— Safety requirements in high-pressure devices
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 10286 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
valve design
classification of valves with regard to the valve operating mechanism (3.10)
3.2
main valve
valve which is fitted to the manifold of a bundle of cylinders, battery vehicle, battery wagon or multiple-
element gas containers (MEGC) isolating it from the main connection(s)
3.3
residual pressure valve
RPV
valve which incorporates a residual pressure device (3.4)
3.4
residual pressure device
RPD
device that is designed to prevent ingress of contaminants by maintaining a positive pressure within
the pressure receptacle relative to atmosphere by closing off its internal gas passages in the discharging
direction
Note 1 to entry: This definition can be different to definitions given in applicable transport regulations.

ISO 10297:2024(en)
3.5
valve with integrated pressure regulator
VIPR
device intended to be permanently fitted to a pressure receptacle which comprises of at least a shut-off
function and pressure regulating system
Note 1 to entry: A VIPR used as a main valve (3.2) is covered by this definition.
3.6
VIPR type A
VIPR design where the primary valve operating mechanism (3.10) is located upstream of the pressure
regulating system (3.9)
Note 1 to entry: For typical designs, see Figure 1.
a) Valve filling connection upstream of the b) Valve filling connection between the primary
primary valve operating mechanism valve operating mechanism and the pressure
regulating system
Key
1 valve inlet connection 4 filling connection closing device
2 primary valve operating mechanism 5 pressure regulating system
3 valve filling connection 6 valve outlet connection
Figure 1 — General structure of VIPR type A designs
3.7
VIPR type B
VIPR design where the pressure regulating system (3.9) is also acting as the primary valve operating
mechanism (3.10)
Note 1 to entry: See Figure 2.

ISO 10297:2024(en)
Key
1 valve inlet connection 4 filling connection closing device
2 pressure regulating system including primary valve 5 valve outlet connection
operating mechanism
3 valve filling connection
Figure 2 — General structure of a VIPR type B design
3.8
VIPR type C
VIPR design where the primary valve operating mechanism (3.10) is located downstream of the pressure
regulating system (3.9)
Note 1 to entry: The primary valve operating mechanism can be a flow selector.
Note 2 to entry: See Figure 3.

ISO 10297:2024(en)
Key
1 valve inlet connection 4 filling connection closing device
2 primary valve operating mechanism 5 pressure regulating system
3 valve filling connection 6 valve outlet connection
Figure 3 — General structure of a VIPR type C design
3.9
pressure regulating system
device(s) that reduce(s) the inlet pressure to a controlled outlet pressure
Note 1 to entry: A pressure regulating system can comprise of one or more stages of pressure regulation.
Note 2 to entry: The pressure regulating system can be either adjustable (adjustable pressure setting) or pre-set
(fixed pressure setting).
3.10
valve operating mechanism
mechanism which closes and opens the valve orifice, and which includes the internal and external
sealing systems
EXAMPLE A threaded valve spindle which, when rotated, raises and lowers a seal/seat.
Note 1 to entry: For a VIPR, the valve operating mechanism is called the primary valve operating mechanism.
Note 2 to entry: For a VIPR type B, the pressure regulating system is also acting as the primary valve operating
mechanism.
3.11
valve operating device
component which actuates the valve operating mechanism (3.10)
EXAMPLE Handwheel (including knob), key, toggle, lever or actuator.
3.12
external leak tightness
leak tightness to atmosphere (leakage in and/or leakage out) when the valve is open
Note 1 to entry: The total external leakage typically comprises that from the valve external sealing system plus, for
example, pressure relief device, RPD, pressure indicating devices and pressure regulating system.
Note 2 to entry: See Figure 4.

ISO 10297:2024(en)
Note 3 to entry: Leakage in describes a leak resulting in a flow direction into the valve during vacuum testing. Leakage
out describes a leak resulting in a flow direction out of the valve.
a) p < p b) p > p
a a
Key
1 valve outlet connection (sealed)
p internal pressure
p atmospheric pressure
a
a
Leakage in (vacuum test).
b
Leakage out.
Figure 4 — External leak tightness
3.13
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 5.
Note 2 to entry: Leakage in describes a leak resulting in a flow direction into the valve during vacuum testing. Leakage
out describes a leak resulting in a flow direction out of the valve.

ISO 10297:2024(en)
a) p < p b) p > p
a a
Key
1 valve outlet connection (open)
p internal pressure
p atmospheric pressure
a
a
Leakage in (vacuum test).
b
Leakage out.
Figure 5 — Internal leak tightness
3.14
leak tightness in transport and storage conditions
leak tightness across any closing device (e.g. valve seat, filling connection closing device, outlet connection
closing device) and integrated pressure retaining components (e.g. active pressure gauge, pressure relief
device) located upstream of the closing device, when the valve is closed
Note 1 to entry: For valves without any integrated pressure retaining components located upstream the valve seat,
the leak tightness in transport and storage conditions corresponds to the internal leak tightness (3.13).
3.15
valve working pressure
p
w
settled pressure of a compressed gas at a uniform reference temperature of 15 °C in a full pressure receptacle
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).
3.16
valve hydraulic test pressure
p
vht
minimum pressure applied to a valve during the hydraulic pressure test
3.17
valve test pressure
p
vt
minimum pressure applied to a valve during testing

ISO 10297:2024(en)
3.18
handwheel diameter
D
nominal value of twice the largest radius from the centre of the handwheel
3.19
minimum closing torque
T
c
torque necessary to be applied to a valve operating device (3.11) of a newly manufactured valve to obtain
internal leak tightness (3.13) at valve test pressure (3.17) and room temperature
Note 1 to entry: The minimum closing torque is expressed in Nm.
3.20
endurance torque
T
e
closing torque applied during the endurance test
Note 1 to entry: The endurance torque is expressed in Nm.
3.20.1
endurance torque at start
T
e,start
endurance torque (3.20) to be applied at the beginning of the endurance test
3.20.2
endurance torque at end
T
e,end
endurance torque (3.20) measured at the end of the endurance test to achieve internal leak tightness (3.13)
3.21
excessive torque
torque applied in opening and closing direction in excess of specified operating torques
Note 1 to entry: Excessive torques are differentiated in over torques (3.21.1 and 3.21.2) and failure torques (3.21.3).
3.21.1
over torque
T
o
opening or closing torque (whichever is the lower value) applied to the valve operating device (3.11) to
determine the level of torque which the valve operating mechanism (3.10) can tolerate and remain operable
Note 1 to entry: The over torque is expressed in Nm.
3.21.2
over torque for a VIPR type B
T
ob
torque applied to the valve operating device (3.11) in opening and closing direction which the valve operating
mechanism (3.10) and/or stop mechanism for a VIPR type B (3.22) can tolerate and remain operable
Note 1 to entry: This torque also applies to a VIPR type C with the flow selector acting as the primary valve operating
mechanism.
Note 2 to entry: The over torque is expressed in Nm.
3.21.3
failure torque
T
f
opening or closing torque (whichever is the lower value) applied to the valve operating device (3.11) to obtain
mechanical failure of the valve operating mechanism (3.10) and/or valve operating device (3.11)
Note 1 to entry: The failure torque is expressed in Nm.

ISO 10297:2024(en)
3.22
stop mechanism for a VIPR type B
system which limits the position of the valve operating device (3.11)
Note 1 to entry: This also applies to a VIPR type C with the flow selector acting as the primary valve operating
mechanism.
3.23
total package mass
combined mass of a gas cylinder, pressure drum or tube (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.
3.24
valve inlet connection
connection on the valve which connects the valve to the pressure receptacle
3.25
valve outlet connection
connection on the valve used to discharge the pressure receptacle
Note 1 to entry: For most valves, this connection is also used for filling the pressure receptacle.
3.26
valve filling connection
connection on the valve used to fill the pressure receptacle
Note 1 to entry: For some valves (e.g. VIPRs), the valve filling connection is different from the valve outlet connection.
3.27
filling connection closing device
closing device located in the valve filling connection (3.26)
EXAMPLE Non-return valve, isolating valve.
4 Valve description
4.1 A valve typically comprises:
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;
ISO 10297:2024(en)
NOTE The relevant transport regulation can require or forbid pressure relief devices for some gases, gas
mixtures or gas groups. Additional requirements for pressure relief devices can exist in international/regional
regulations/standards.
b) dip tube;
c) outlet connection plug/cap;
d) excess flow device;
e) filling connection closing device (e.g. non-return valve, isolating valve);
f) RPD with or without non-return function;
g) pressure regulating system;
h) separated valve filling connection (i.e. separated from the valve outlet connection, e.g. for a VIPR);
i) flow restricting orifice;
j) filter(s).
Not all of these components have test requirements detailed in this document.
4.3 Common valve designs are:
a) o-ring gland seal valves (see Figure 6);
b) diaphragm gland seal valves (see Figure 7);
c) compression packed gland seal valves (see Figure 8);
d) pressure seal valves (see Figure 9);
e) reverse seated valves (see Figure 10).
The valve designs shown in Figures 6 to 9 (reproduced from CGA V-9—2019 with permission from
Compressed Gas Association (CGA)) are given as typical examples, each with one sealing system and one
valve operating device only.
A pin-index (post-type medical) valve (see Figure 11, reproduced from CGA V-9—2019 with permission from
Compressed Gas Association (CGA)) is shown for illustration purposes to show a valve outlet connection
geometry in common medical gas cylinder applications.

ISO 10297:2024(en)
Key
1 handwheel
2 handwheel retaining nut
3 upper spindle
4 o-ring
5 seat insert
6 valve outlet connection
7 valve inlet connection
8 pressure relief device
9 body seat
10 lower spindle
11 washer
12 gland nut
Figure 6 — O-ring gland seal valve
(non-metallic seal, handwheel operated)

ISO 10297:2024(en)
Key
1 handwheel retaining screw
2 washer
3 gland nut
4 diaphragms
5 flow restrictor (when specified)
6 seat insert
7 pressure relief device
8 body seat
9 seat opening spring
10 lower spindle
11 upper spindle
12 handwheel
Figure 7 — Diaphragm gland seal valve
(non-metallic seal, handwheel operated)
...