SIST EN ISO 15995:2021

SLOVENSKI STANDARD
oSIST prEN ISO 15995:2021
01-marec-2021
Plinske jeklenke - Specifikacija in preskušanje ventilov za jeklenke za utekočinjeni
naftni plin (UNP) - Ročno upravljanje (ISO/FDIS 15995:2021)
Gas cylinders - Specifications and testing of LPG cylinder valves - Manually operated
(ISO/FDIS 15995:2021)
Gasflaschen - Spezifikation und Prüfung von Flaschenventilen für Flüssiggas (LPG) -
Handbetätigt (ISO/FDIS 15995:2021)
Bouteilles à gaz - Spécifications et essais pour valves de bouteilles de GPL - Fermeture
manuelle (ISO/FDIS 15995:2021)
Ta slovenski standard je istoveten z: prEN ISO 15995
ICS:
23.020.35 Plinske jeklenke Gas cylinders
23.060.40 Tlačni regulatorji Pressure regulators
oSIST prEN ISO 15995:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 15995:2021

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oSIST prEN ISO 15995:2021
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 15995
ISO/TC 58/SC 2
Gas cylinders — Specifications and
Secretariat: AFNOR
testing of LPG cylinder valves —
Voting begins on:
2021­02­10 Manually operated
Voting terminates on:
Bouteilles à gaz — Spécifications et essais pour valves de bouteilles de
2021­05­05
GPL — Fermeture manuelle
ISO/CEN PARALLEL PROCESSING
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 15995:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2021

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oSIST prEN ISO 15995:2021
ISO/FDIS 15995:2021(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
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
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Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

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oSIST prEN ISO 15995:2021
ISO/FDIS 15995:2021(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Design and specification. 4
4.1 General . 4
4.2 Materials . 5
4.2.1 General. 5
4.2.2 Operating temperatures . 5
4.2.3 Copper alloys . 5
4.2.4 Non­metallic materials . 5
4.3 Essential components . 6
4.3.1 Valve operating mechanism . 6
4.3.2 Valve body . 6
4.3.3 Valve stem . 6
4.3.4 Valve outlet . 6
4.3.5 Excess flow valve . 7
4.4 Optional components . 7
4.4.1 General. 7
4.4.2 Pressure relief valve . 7
4.4.3 Eduction tube . 7
4.4.4 Fixed liquid level gauge . 7
4.4.5 Excess flow valve . 7
4.4.6 Non­return valve . 8
4.4.7 Liquid level indicator . 8
4.4.8 Sealing cap and sealing plug . 8
4.4.9 Sediment tube . 8
4.5 Leak tightness . 8
4.6 Operating torque . 8
4.7 Closing torque . 8
4.8 Opening torque . 8
5 Valve type test . 9
5.1 General . 9
5.2 Test samples . 9
5.3 Test procedure and test requirements .10
5.4 Inspection .11
5.5 Hydraulic pressure test .11
5.5.1 Procedure .11
5.5.2 Requirement .11
5.6 External and internal leak tightness tests .11
5.6.1 Procedure .11
5.6.2 Requirement .12
5.7 Valve stem test .12
5.7.1 Procedure .12
5.7.2 Requirement .13
5.8 Hand wheel fire exposure test .13
5.8.1 Procedure .13
5.8.2 Requirement .13
5.9 Impact test .13
5.9.1 General.13
5.9.2 Procedure .13
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oSIST prEN ISO 15995:2021
ISO/FDIS 15995:2021(E)

5.9.3 Requirement .15
5.10 Excessive closing torque test .15
5.10.1 Procedure .15
5.10.2 Requirement .15
5.11 Excessive opening torque test.15
5.11.1 Procedure .15
5.11.2 Requirement .15
5.12 Endurance test .16
5.12.1 Procedure .16
5.12.2 Requirement .16
5.13 Examination of dismantled valves .16
5.13.1 Procedure .16
5.13.2 Requirement .17
5.14 Excess flow valve test .17
5.14.1 General.17
5.14.2 Excess flow valve test with air .17
5.14.3 Excess flow valve test with water .17
5.14.4 Excess flow strength test .18
5.15 Non­return valve test .18
5.15.1 Procedure .18
5.15.2 Requirement .18
5.16 Vibration test .19
5.16.1 Procedure .19
5.16.2 Requirement .19
6 Documentation and test report.19
6.1 Documentation .19
6.2 Test report .19
7 Production testing .19
8 Markings .19
Annex A (normative) Special valves .21
Annex B (normative) Production testing and inspection .22
Annex C (normative) Special low temperature requirements .23
Annex D (normative) Vibration testing .24
Bibliography .25
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oSIST prEN ISO 15995:2021
ISO/FDIS 15995:2021(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 non­governmental, 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 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 286, Liquefied petroleum gas equipment and accessories, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 15995:2019) of which it constitutes a
minor revision. The changes compared to the previous edition are as follows:
— correction of Clause 8, list item c).
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.
© ISO 2021 – All rights reserved v

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oSIST prEN ISO 15995:2021
ISO/FDIS 15995:2021(E)

Introduction
This document covers the function of a LPG cylinder valve as a closure (defined by the UN Model
[15]
Regulations ).
This document has been written so that it is suitable to be referenced in the UN Model Regulations.
Cylinder valves complying with this document can be expected to perform satisfactorily under normal
service conditions.
When an LPG cylinder valve has been approved according to a previous version of this document, the
body responsible for approving the same LPG cylinder valve to this new edition should consider which
tests need to be performed.
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.
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oSIST prEN ISO 15995:2021
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 15995:2021(E)
Gas cylinders — Specifications and testing of LPG cylinder
valves — Manually operated
1 Scope
This document specifies the requirements for design, specification, type testing and production testing
and inspection of dedicated LPG manually operated cylinder valves for use with and directly connected
to transportable refillable LPG cylinders.
It also includes requirements for associated equipment for vapour and liquid service. Bursting discs
and/or fusible plugs are not covered in this document.
Annex B identifies requirements for production testing and inspection.
This document excludes other LPG cylinder devices which are not an integral part of the dedicated
manually operated cylinder valve.
This document does not apply to cylinder valves for fixed automotive installations and ball valves.
NOTE For self-closing LPG cylinder valves see ISO 14245. For cylinder valves for compressed, dissolved and
[2] [6] [7]
other liquefied gases see ISO 10297, ISO 17871 or ISO 17879 .
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 11114­1, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1:
Metallic materials
ISO 11114­2, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 2:
Non-metallic materials
ISO 2859­1:1999, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 13341, Gas cylinders — Fitting of valves to gas cylinders
ISO 10286, Gas cylinders — Terminology
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 terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
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oSIST prEN ISO 15995:2021
ISO/FDIS 15995:2021(E)

3.1
liquefied petroleum gas
LPG
low pressure liquefied gas composed of one or more light hydrocarbons which are assigned to UN 1011,
UN 1075, UN 1965, UN 1969 or UN 1978 only and which consists mainly of propane, propene, butane,
butane isomers, butene with traces of other hydrocarbon gases
[SOURCE: ISO 10286:2015, 723, modified.]
3.2
cylinder valve
valve
primary shutoff device fitted to LPG cylinders, intended for liquid or vapour filling and withdrawal
Note 1 to entry: The valve includes the valve body (3.8), valve stem (3.14), valve outlet (3.15) and valve operating
mechanism (3.22).
Note 2 to entry: The valve can also include additional devices, e.g. eduction tube (3.5), liquid level indicator (3.7),
fixed liquid level gauge (3.6), excess flow valve (3.9), non-return valve (3.10), sediment tube (3.19), and pressure
relief valve (3.30).
3.3
external leak tightness
leak tightness to atmosphere (leakage in and/or leakage out), when the valve is open
3.4
internal leak tightness
leak tightness across the valve seat (leakage in and/or leakage out), when the valve is closed
3.5
eduction tube
tube fitted to the valve to allow withdrawal of liquid LPG with the cylinder in its normal operating
position
3.6
fixed liquid level gauge
device such as a dip tube in combination with a vent valve to verify that the predetermined maximum
liquid level in a cylinder has been reached or surpassed
3.7
liquid level indicator
device such as a float gauge, permitting the gauging of the liquid level in the cylinder
3.8
valve body
major valve component including valve stem (3.14) and valve outlet (3.15) and, where applicable, the
provision for other optional components
3.9
excess flow valve
valve comprising two or more components designed to close or partially close when the flow of liquid or
vapour passing through it exceeds a predetermined value and to re-open when the pressure differential
across the valve has been restored below a certain value
3.10
non-return valve
automatic valve which allows gas/liquid to flow only in one direction
[SOURCE: ISO 10286:2015, 349, amended — liquid added.]
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oSIST prEN ISO 15995:2021
ISO/FDIS 15995:2021(E)

3.11
dual valve
valve designed to allow separate vapour and liquid withdrawal from a cylinder in its normal operating
position each port having its own valve operating mechanism
3.12
sealing element
element used to obtain internal leak tightness (3.4)
3.13
special valve
valve which is only used for cylinders up to and including 7,5 l water capacity, having a hand wheel
diameter less than 30 mm and where the maximum section of gas passage is not more than 4 mm
diameter
3.14
valve stem
section of the valve body (3.8), which connects to the cylinder
3.15
valve outlet
section of the valve body (3.8) to which a regulator or connector can be fitted for vapour or liquid
withdrawal
Note 1 to entry: The valve outlet is also normally used for filling the cylinder.
3.16
type test
test or series of tests conducted to prove that the design meets the requirements of this document
3.17
cylinder opening
part of the cylinder to which the valve stem (3.14) connects
3.18
test pressure
pressure at which the valve or component is tested
3.19
sediment tube
device designed to reduce the risk of foreign matter, which can be in the cylinder, entering the valve
3.20
sealing cap
device which is intended to seal the external outlet connection of a valve
[SOURCE: ISO 10286:2015, 368]
3.21
sealing plug
device which is intended to seal the internal outlet connection of a valve
[SOURCE: ISO 10286:2015, 369]
3.22
valve operating mechanism
mechanism which closes and opens the valve orifice and which includes the internal and external
sealing systems
[SOURCE: ISO 10286:2015, 328, modified — EXAMPLE deleted.]
Note 1 to entry: Normally the valve operating mechanism include
...