EN ISO 22435:2007

SLOVENSKI STANDARD
01-april-2009
Plinske jeklenke - Ventili za jeklenke z vgrajenim regulatorjem tlaka - Specifikacija
in preskušanje tipa (ISO 22435:2007)
Gas cylinders - Cylinder valves with integrated pressure regulators - Specification and
type testing (ISO 22435:2007)
Gasflaschen - Druckminderer in Flaschenventilen - Allgemeine Anforderungen und
Baumusterprüfung (ISO 22435:2007)
Bouteilles à gaz - Robinets de bouteilles avec détendeur intégré - Spécifications et
essais de type (ISO 22435:2007)
Ta slovenski standard je istoveten z: EN ISO 22435:2007
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 22435
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2007
ICS 23.020.30
English Version
Gas cylinders - Cylinder valves with integrated pressure
regulators - Specification and type testing (ISO 22435:2007)
Bouteilles à gaz - Robinets de bouteilles avec détendeur Gasflaschen - Druckminderer in Flaschenventilen -
intégré - Spécifications et essais de type (ISO 22435:2007) Allgemeine Anforderungen und Typprüfung (ISO
22435:2007)
This European Standard was approved by CEN on 6 July 2007.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 22435:2007: E
worldwide for CEN national Members.

Contents Page
Foreword.3

Foreword
This document (EN ISO 22435:2007) 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 March 2008, and conflicting national standards shall be withdrawn at
the latest by March 2008.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 22435:2007 has been approved by CEN as a EN ISO 22435:2007 without any modification.

INTERNATIONAL ISO
STANDARD 22435
First edition
2007-09-01
Gas cylinders — Cylinder valves with
integrated pressure regulators —
Specification and type testing
Bouteilles à gaz — Robinets de bouteilles avec détendeur intégré —
Spécifications et essais de type

Reference number
ISO 22435:2007(E)
©
ISO 2007
ISO 22435:2007(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

©  ISO 2007
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing 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 2007 – All rights reserved

ISO 22435:2007(E)
Contents Page
Foreword. v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Symbols and terminology. 4
5 Design requirements . 4
5.1 General. 4
5.2 Description . 5
5.3 Materials . 5
5.4 Pressure indicators . 6
5.5 Filling connection . 6
5.6 Cylinder connection . 6
5.7 Outlet connection . 6
5.8 Outlet pressure for acetylene . 7
5.9 Flow control valve (flow controller) . 7
5.10 Pressure adjusting device . 7
5.11 Filtration. 7
5.12 Main shut-off valve . 7
5.13 Flow and pressure performance for regulators without flow metering devices. 7
5.14 Pressure relief valve. 8
5.15 Leakage. 8
5.16 Mechanical strength . 8
5.17 Resistance to ignition. 9
5.18 Requirement for VIPR with flow metering devices. 9
5.19 Constructional requirements. 9
5.20 Valve operating device. 9
6 Test methods. 10
6.1 General. 10
6.2 Documentation. 11
6.3 Number of test samples . 11
6.4 Test sequence . 12
6.5 Test method for mechanical strength. 13
6.6 Test methods for flow and pressure performance for regulators without flow metering
devices. 13
6.7 Test method for relief valve . 21
6.8 Pressure retention of the low-pressure side of the pressure regulator. 21
6.9 Test method for flowmeter mechanical strength . 22
6.10 Test method for accuracy of VIPR with flowmeter. 22
6.11 Test method for accuracy of VIPR with flowmeter and with fixed orifices. 22
6.12 Test methods for leakage . 22
6.13 Test method for operating and loosening torques . 23
6.14 Test method for endurance of the main shut-off mechanism. 23
6.15 Test method for endurance of the non-return valve . 25
6.16 Test method for ignition. 25
6.17 Test method for resistance to acetylene decomposition . 26
6.18 Test method for flame resistance of the valve operating device. 26
7 Marking . 29
ISO 22435:2007(E)
8 Instructions. 29
Annex A (normative) Valve impact test. 30
Annex B (informative) Endurance test . 32
Bibliography . 36

iv © ISO 2007 – All rights reserved

ISO 22435:2007(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 22435 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 2, Cylinder
fittings.
ISO 22435:2007(E)
Introduction
Cylinder valves with integrated pressure regulators are used to reduce the high cylinder pressure to a lower
pressure suitable for use.
These functions cover a wide range of inlet and outlet pressures and flows which require specific design
characteristics. It is important that the operating characteristics of these valves be specified and tested in a
defined manner.
Such valves are more complicated than conventional cylinder valves yet subject to the same environmental
and transportation conditions. These conditions should be borne in mind at the design and development stage.
This International Standard pays particular attention to
⎯ suitability of materials,
⎯ safety (mechanical strength, safe relief of excess pressure and resistance to ignition),
⎯ gas-specificity,
⎯ cleanliness,
⎯ testing,
⎯ identification, and
⎯ information supplied.
vi © ISO 2007 – All rights reserved

INTERNATIONAL STANDARD ISO 22435:2007(E)

Gas cylinders — Cylinder valves with integrated pressure
regulators — Specification and type testing
1 Scope
This International Standard applies to cylinder valves with integrated pressure regulators (VIPR) intended to
be fitted to gas cylinders that convey compressed, liquefied or dissolved gases.
This International Standard is not intended for medical applications (see ISO 10524-3). Further, additional
specific requirements for valves fitted with safety valves and bursting discs (see EN 14513) and for valves
fitted with residual pressure valves (see ISO 15996) are not covered by this International Standard.
2 Normative references
The following referenced documents are indispensable for the application 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 2503:1998, Gas welding equipment — Pressure regulators for gas cylinders used in welding, cutting and
allied processes up to 300 bar
ISO 3253, Gas welding equipment — Hose connections for equipment for welding, cutting and allied
processes
ISO 5145, Cylinder valve outlets for gases and gas mixtures — Selection and dimensioning
ISO 5171, Pressure gauges used in welding, cutting and allied processes
ISO 7289, Quick-action couplings with shut-off valves for gas welding, cutting and allied processes
ISO 7291:1999, Gas welding equipment — Pressure regulators for manifold systems used in welding, cutting
and allied processes up to 300 bar
ISO/TR 7470, Valve outlets for gas cylinders — List of provisions which are either standardized or in use
ISO 9090, Gas tightness of equipment for gas welding and allied processes
ISO 10156, Gases and gas mixtures — Determination of fire potential and oxidizing ability for the selection of
cylinder valve outlets
ISO 10920, Gas cylinders — 25E taper thread for connection of valves to gas cylinders — Specification
ISO 11114-1, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas
contents — Part 1: Metallic materials
ISO 11114-2, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas
contents — Part 2: Non-metallic materials
ISO 22435:2007(E)
ISO 11114-3, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas
contents — Part 3: Autogenous ignition test in oxygen atmosphere
ISO 11117, Gas cylinders — Valve protection caps and valve guards for industrial and medical gas
cylinders — Design, construction and tests
ISO 13341, Transportable gas cylinders — Fitting of valves to gas cylinders
ISO 15001, Anaesthetic and respiratory equipment — Compatibility with oxygen
ISO 15996, Gas cylinders — Residual pressure valves — General requirements and type testing
EN 13918, Gas welding equipment — Integrated flowmeter regulators used on cylinders for welding, cutting
and allied processes — Classification, specification and tests
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
adjustable pressure regulator
device that has been provided with a means of operator adjustment of the delivery pressure under normal use
3.2
closure pressure
P
stabilized outlet pressure, one minute after cessation of the flow, from a pressure regulator by which the flow
has been set to a standard discharge
3.3
cylinder valve with integrated pressure regulator
VIPR
device intended to be permanently fitted to a gas cylinder connection and comprising a shut-off valve system
and pressure reduction system
3.4
filling port
point on the device through which the cylinder is filled
3.5
flow characteristic
variation of the outlet pressure in relation to the rate of flow from zero to maximum capacity flow of the
pressure regulator with the inlet pressure remaining constant
3.6
flow gauge
device that measures pressure and that is calibrated in units of flow
3.7
flowmeter
device that measures and indicates the flow of a specific gas or gas mixture
3.8
hysteresis
lagging of the outlet pressure (effect) when the flow (cause) is varied so that at a constant inlet pressure the
values of outlet pressure measured with increasing flow do not coincide with the values of outlet pressure
measured with decreasing flow
2 © ISO 2007 – All rights reserved

ISO 22435:2007(E)
3.9
maximum discharge flow
Q
max
maximum flow which is delivered by the pressure regulator at the rated outlet pressure, p , and at the test inlet
pressure, p
3.10
orifice
restriction of known cross-section that delivers a constant flow of gas when supplied with gas at a constant
upstream pressure
3.11
pre-set pressure regulator
pressure regulator that has not been provided with a means of operator adjustment of the delivery pressure
under normal use
3.12
pressure characteristic
variation of the outlet pressure with inlet pressure under specific initial flow conditions
3.13
pressure regulator
device for regulation of a generally variable inlet pressure to an outlet pressure as constant as possible
3.14
main shut-off mechanism
shut-off valve between the gas cylinder and the regulating mechanism of the device
3.15
rated outlet pressure
P
downstream pressure for the standard discharge, Q , specified in the instructions for use
3.16
pressure relief valve
device designed to release excess pressure from the outlet side of the pressure regulator at a pre-set value
3.17
secondary operating mechanism
means of setting the outlet discharge flow between zero and maximum
3.18
standard discharge
Q
flowrate, specified in the instructions for use for which the pressure regulator is designed to maintain a rated
outlet pressure, p , at test inlet pressure, p

2 3
3.19
test inlet pressure
p
inlet pressure at which the standard discharge of the pressure regulator, Q , is measured and which is twice
the rated outlet pressure, p , plus 100 kPa, i.e. p = (2 p + 100 kPa)
2 3 2
3.20
test outlet pressure
p
highest or lowest value of the outlet pressure resulting from a variation in the inlet pressure between p and p
1 3
at previously adjusted conditions p , p , Q

1 2 1
ISO 22435:2007(E)
3.21
valve test pressure
p
vt
for compressed gases, p = 1,2 × p ;
vt w
for liquefied gases and dissolved gases under pressure (e.g. acetylene), p is at least equal to the minimum
vt
test pressure of the cylinder quoted in the relevant transportation regulation for that gas or gas group
3.22
working pressure
p
w
settled pressure, at a uniform temperature of 15 °C, for a full gas cylinder
NOTE 1 For compressed gases, p in this International Standard corresponds to p in ISO 2503.
w 1
NOTE 2 This definition applies only to compressed gases and not to liquefied gases and dissolved gases (acetylene).
4 Symbols and terminology
The symbols used for the physical characteristics are given in Table 1.
Table 1 — Notations, symbols and designations
Symbol Designation
p Working pressure
w
p Valve test pressure
vt
p Inlet pressure
p Rated outlet pressure
p Test inlet pressure, (2 p + 100) kPa
3 2
p Closure pressure
p Maximum closure pressure
4max
p Test outlet pressure
Q Standard discharge
Q Maximum discharge
max
Q Discharge of the relief valve
RV
R Coefficient of pressure increase upon closure, pp− /p
( )
42 2
i Irregularity coefficient, pp− /p
( )
52 2
5 Design requirements
5.1 General
VIPR shall operate satisfactorily over a range of service temperatures, from − 20 °C to + 65 °C. The range
may be extended for short periods (e.g. during filling). Where higher or lower service temperatures are
required for longer periods, the purchaser shall specify accordingly.
VIPR shall be capable of withstanding the mechanical stresses or chemical attack they may experience during
intended service, e.g. during storage, valving into cylinders, filling processes, transportation and end use of the
cylinder.
4 © ISO 2007 – All rights reserved

ISO 22435:2007(E)
5.2 Description
This International Standard does not prescribe the components that the VIPR shall comprise.
A cylinder valve with integrated pressure regulator typically comprises
⎯ a body,
⎯ an inlet connection to the cylinder,
⎯ a main shut-off mechanism (to isolate the device from the high pressure gas in the cylinder),
⎯ a filling connection (it may be fitted with a non-return valve or an isolating valve),
⎯ the pressure regulating mechanism(s),
⎯ a pressure relief valve on the low pressure side of the regulating mechanism(s) and
⎯ an outlet connection (for the end user).
A VIPR can also be fitted with
⎯ a secondary operating mechanism to set the outlet flow,
NOTE Some devices can have both mechanisms, some others can have only one.
⎯ a pressure relief device to protect the cylinder,
⎯ a siphon tube,
⎯ a screwed plug or cap on the outlet and/or the filling connection,
⎯ an excess flow limiting device,
⎯ a means of preventing the ingress of atmospheric air,
⎯ a residual pressure retaining device (see ISO 15996),
⎯ pressure indicator(s) on the high and/or low pressure sides of devices,
⎯ a flow control device,
⎯ a flow indicator (e.g. flowmeter or flow gauge) and
⎯ filter(s).
5.3 Materials
Metallic and non-metallic materials in contact with the gas shall be chemically and/or physically compatible
with the gas (see ISO 11114-1 and ISO 11114-2).
Because of the risk of forming explosive acetylides, VIPR for acetylene may be manufactured from copper-
based alloys only if the copper content does not exceed 70 % (by mass). The manufacturer shall not use any
procedure resulting in copper enrichment of the surface. For the same reasons, silver content of alloys shall
be limited for acetylene VIPR. The acceptable limit varies between 43 % (by mass) and 50 % (by mass), but in
no case exceeds 50 % (by mass).
ISO 22435:2007(E)
Ignition resistance in oxygen or other highly oxydising gases (see ISO 10156) of non-metallic materials and
lubricants shall have been established by an appropriate test procedure (see ISO 11114-3). Where, during the
filling of gas mixtures containing oxygen (even if the final mixture is less oxydising than air), there is the
possibility that high pressure oxygen comes into contact with such material, the purchaser shall specify
accordingly.
Non-metallic sealing material for use with air, oxygen and oxygen-enriched gases shall be capable of
withstanding an ageing sensitivity test.
5.4 Pressure indicators
Devices other than pressure gauges may be used to indicate pressure or flow. Pressure indicators shall be of
the fail-safe type, i.e. the operator shall not be injured in case of failure.
If pressure gauges are used, they shall comply with the safety features of ISO 5171. This applies also to
pressure gauges used to indicate flow.
5.5 Filling connection
The filling connection shall be designed to handle the intended service conditions. It shall comply with
ISO 5145, the relevant national standards (see ISO/TR 7470) or be a proprietary connection. If the filling
connection is separate to the outlet connection and is not equipped with a non-return valve or isolating valve,
it shall be provided with a pressure-tight device, e.g. a valve pressure plug or a cap which can be operated or
removed only by the use of a special tool. Where applicable, such a device shall be designed to vent gas
before becoming disengaged.
If the filling connection is made through the outlet connection, it shall be designed so that it does not interfere
with a gas withdrawal connection made in accordance with the relevant national or International Standard.
The filling connection non-return valve, if fitted, shall comply with the requirements of 5.15 after testing as
described in 6.15.
5.6 Cylinder connection
The connection to the cylinder shall be in accordance with international or national standards, (e.g. 25E, see
ISO 10920).
If other connectors are used, evidence shall be provided by the manufacturer that an equivalent mechanical
strength is achieved.
5.7 Outlet connection
The connection shall be either
a) a proprietary fitting; if a quick connection is used, it shall comply with the endurance tests of ISO 7289 or
b) a welding hose connection (e.g. ISO 3253 for a threaded connection or ISO 7289 for a quick connection
or other regional or national standards) or
c) a high pressure cylinder valve outlet connection (e.g. ISO 5145).
If a residual pressure valve is fitted to the outlet connection, it shall be designed so that it does not interfere
with a gas withdrawal connection made in accordance with the relevant standard.
6 © ISO 2007 – All rights reserved

ISO 22435:2007(E)
5.8 Outlet pressure for acetylene
For acetylene, the closure pressure p shall not exceed 1,5 bar for all inlet pressures when the pressure
adjusting device is fully charged.
5.9 Flow control valve (flow controller)
If a flow control valve is fitted, the flow control knob and the valve spindle shall be captive such that they
cannot be dismantled without the use of a tool.
Compliance shall be tested by attempting to remove the knob and spindle without the use of a tool.
5.10 Pressure adjusting device
The pressure adjusting device, if fitted, shall be captive and shall be removable only by the use of a tool. The
VIPR shall be designed so that the pressure regulator valve cannot be held in the open position as a
consequence of the pressure regulator spring being compressed to its solid length and thereby allowing gas to
pass from the high pressure to the low pressure side. For VIPR designed to allow filling of the cylinder through
the outlet connection, a special tool may be used to hold the pressure regulator valve open for filling only.
Compliance shall be tested by visual inspection.
5.11 Filtration
The pressure regulator valve seat shall be protected from particulates contamination (e.g. by the use of a
filter). A dust filter, having an effective cross-section compatible with the discharge, shall be mounted within
the pressure regulator upstream of the pressure regulator valve. The filter shall retain particles greater than or
equal to 0,1 mm.
5.12 Main shut-off valve
The main shut-off mechanism shall meet the requirements given in 5.15 after 2 000 opening and closing
cycles. The test is described in 6.14.1.
If the main shut-off valve is the pressure regulator valve itself, an endurance test shall be performed according
to 6.14.2. The requirements stated in 5.15 shall be respected after 100 000 cycles.
5.13 Flow and pressure performance for regulators without flow metering devices
5.13.1 Flow performance and characteristics
The standard discharge, Q , and the rated outlet pressure, p , shall be in accordance with the values stated
1 2
by the manufacturer.
The test method for the standard discharge, Q , and rated outlet pressure, p , is given in 6.6.2.
1 2
The test method for the flow characteristic is given in 6.6.3.
5.13.2 Coefficient of pressure increase upon closure R
The coefficient R shall be less than 0,3 when determined in accordance with 6.6.4.
5.13.3 Irregularity coefficient i
The coefficient i shall be within the limits ± 0,3 when determined in accordance with 6.6.5.
ISO 22435:2007(E)
5.14 Pressure relief valve
A pressure relief valve shall be provided as a component part of the pressure regulator. In the case of
acetylene, such a valve is optional and its performance will be specified by the manufacturer. The
overpressure protection device shall be
a) pre-set to a fixed value or to a fixed differential value above the reduced pressure and
b) adjustable only with the use of a special tool.
A pressure relief valve (if fitted) shall lift automatically to relieve excess pressure and shall reset at a pressure
W p or the set pressure.
For the whole inlet pressure range, the relief valve shall remain gas tight according to 5.15 when the flow is
stopped with the adjusting pressure device totally screwed in. The test shall be performed at least at p , p
w 3
and at the inlet pressure corresponding to p if p is greater than p .
5 5 2
The minimum discharge of the relief valve Q shall be equal to or greater than the standard discharge Q at
RV 1
a pressure p = 2 p . The test for the relief valve is described in 6.7.
RV 2
NOTE The relief valve and other protection devices should be fitted in such a way that gas will be discharged safely.
5.15 Leakage
5.15.1 The total external leakage (to the atmosphere) shall not exceed 6 cm /h.
5.15.2 The total internal leakage (through the pressure regulator valve or the main shut-off device) shall not
exceed 6 cm /h.
The test for leakage is described in 6.12.
5.16 Mechanical strength
5.16.1 The inlet side of the VIPR (valve to the cylinder connection) shall be capable of withstanding, for 2 min
without permanent deformation or rupture, 2,25 × p for compressed gases and 1,5 × p for liquefied gases.

w vt
For acetylene VIPR, this pressure test shall be carried out at 450 bar.
The outlet side of the VIPR shall be capable of withstanding four times its rated outlet pressure, p , or 60 bar
for compressed gas and liquefied gas and 30 bar for acetylene (whichever is the greatest) without rupturing or
showing any sign of deformation.
The test for mechanical strength is described in 6.5.
5.16.2 If the VIPR is intended to be fitted on cylinders with a protection cap or guard, it shall pass the drop
test in accordance with ISO 11117. After the drop test, the cylinder shall be pressurized to one bar minimum,
the shut-off valve shall be closed with the closure torque specified by the manufacturer or by using a lever,
and the VIPR shall comply with 5.15. After the drop test, the filling port non-return valve, if fitted, shall comply
with 5.15.1.
NOTE Distortion of the VIPR due to the drop is not a failure of the test.
5.16.3 If it is not intended for the VIPR to be fitted on cylinders with a protection cap or another form of guard,
an impact test shall be carried out (see Annex A).
8 © ISO 2007 – All rights reserved

ISO 22435:2007(E)
5.17 Resistance to ignition
5.17.1 Oxygen
VIPR for oxygen and other gases with oxidising potential greater than air (see ISO 10156) shall not ignite or
show internal scorching damage when submitted to an oxygen pressure surge test.
Where during the filling with gas mixtures containing oxygen (even if the final mixture is less oxydising than
air) there is the possibility that high pressure oxygen comes into contact with such material, the purchaser
shall specify accordingly.
The test for ignition is described in 6.16.
5.17.2 Acetylene
VIPR for acetylene shall pass the acetylene decomposition test described in Annex A of ISO 7291:1999, with
the tube connected to the filling port and with any non-return valve open.
5.18 Requirement for VIPR with flow metering devices
Flow metering device requirements are given in EN 13918. The accuracy class shall be specified by the
manufacturer.
5.19 Constructional requirements
5.19.1 Cleaning
VIPR shall be supplied clean to meet the requirements of the intended service. Lubricants are allowed in
accordance with 5.19.2. Cleanliness levels for oxygen service are specified in ISO 15001.
5.19.2 Lubricants
If lubricants are used that are liable to come in contact with the gas, they shall be compatible with the intended
gas service and the materials of construction in the specified pressure and temperature range.
5.19.3 Integrity of valve assembly
VIPR shall be constructed and assembled in such a way that it is not possible inadvertently to dismantle the
VIPR or its component parts in normal use.
The test for loosening torques is given in 6.13. Torques are given in the documentation requested from the
manufacturer (see 6.2).
5.20 Valve operating device
It shall be designed to permit the closure of the valve after exposure to a flame. The test method for flame
resistance is given in 6.18.
ISO 22435:2007(E)
6 Test methods
6.1 General
6.1.1 Conditions
Before VIPR are introduced into service, they shall be submitted for prototype testing. Prototype testing is
valid for a given family of valves having the same basic design.
Variations to connections do not require further prototype testing.
Changes to the internal components for reasons of gas/material compatibility (for example O-ring, packing,
diaphragm, spindle, lubricant) constitute a type variant within the given family.
Type variants require repetition of the relevant parts of the type test.
Changes of the basic design dimensions of components or changes of the valve body material constitute a
new family and require the full type test.
No VIPR or its components used in the test programme shall enter normal service.
6.1.2 Ambient conditions
Except where otherwise stated, carry out tests at ambient temperature.
6.1.3 Test gas
Carry out tests with clean, oil-free dry air or nitrogen.
In all cases, carry out tests with dry gas with a maximum moisture content corresponding to a dew point
of − 40 °C at atmospheric pressure.
When a VIPR is tested with a gas other than that for which it is intended, convert the flows as shown in
Table 2.
Table 2 — Conversion coefficients
Coefficient for
a
Test gas
Air O N Ar H CO NO He Xe C H C H
2 2 2 2 2 2 2 3 8
Air 1 0,950 1,02 0,851 3,81 0,81 0,81 2,695 0,47 1,05 0,800
N 0,983 0,930 1 0,837 3,75 0,79 0,79 2,65 0,46 1,03 0,784
a
Flow of intended gas = Flow of test gas × conversion coefficient.

6.1.4 Reference conditions
Flows shall be corrected to 23 °C and 101,3 kPa.
10 © ISO 2007 – All rights reserved

ISO 22435:2007(E)
6.2 Documentation
The manufacturer shall make available to the test body the following documents:
⎯ a set of drawings consisting of the general arrangement, parts list, material specifications and detail
drawings including assembly torques and detail of thread sealing/locking components; any type variant
within the given family shall be clearly identified;
⎯ description of VIPR and method of operation;
⎯ information on the field of application of the VIPR (gases and gas mixtures, pressures, use with or without
valve protection device, etc.); it shall be clearly indicated which gases and gas mixtures can be used with
each type variant;
⎯ certificates of material compatibility as required.
6.3 Number of test samples
A minimum of eight samples valves (ten for a VIPR with flowmeter) are required:
⎯ one sample for the mechanical strength test;
⎯ one sample for the safety test;
⎯ two samples for the flowmeter mechanical strength;
⎯ one sample for the performance, functional and operating characteristics and the relief valve;
⎯ two more samples for the relief valve, the loosening torques and for flame resistance;
⎯ three samples for the leakage and endurance tests.
In addition, the following are required:
⎯ three samples for the ignition test (in the case of valves for oxygen cylinders);
⎯ three samples for the acetylene decomposition (in the case of valves for acetylene cylinders);
⎯ three samples for the impact test if needed.
ISO 22435:2007(E)
6.4 Test sequence
Tests shall be carried out in accordance with the schedule given in Table 3.
Table 3 — Sequence of tests
Test Valve
Test Subclause Valve
Test Condition of test valve temperature sample
sequence No. samples
number
°C
Mechanical strength test
1 6.5 As received 20 ± 5 1 1
(high pressure chamber)
Mechanical strength test As received from
2 6.5 20 ± 5 1 1
(low pressure chamber) sequence 1
Pressure retention of the
3 low pressure side of the 6.8 As received 20 ± 5 2 1
pressure regulator
Flowmeter mechanical
4 6.9 As received 20 ± 5 9 to 10 2
strength
Flow and pressure
5 6.6 As received 20 ± 5 3 1
performance
Accuracy of VIPR with
6 6.10 As received 20 ± 5 3 1
flowmeter
Accuracy of VIPR with
7 flowmeter and with fixed 6.11 As received 20 ± 5 3 1
orifices
One sample as
8 Pressure relief valve 6.7 received from 20 ± 5 3 to 5 3
sequence 5
9 Leakage 6.12 As received 20 ± 5 6 to 8 3
From test sequence 9,
10 Leakage 6.12 aged at 65 °C for 20 ± 5 6 to 8 3
5 days
Endurance of the main As received from
11 6.14 20 ± 5 6 to 8 3
shut-off mechanism sequence 10
Endurance of the As received from
12 6.15 20 ± 5 6 to 8 3
non-return valve sequence 11
As received from
13 Leakage 6.12 20 ± 5 6 to 8 3
sequence 12
As received from
14 Leakage 6.12 65 ± 5 6 to 8 3
sequence 13
As received from
15 Leakage 6.12 − 20 ± 5 6 to 8 3
sequence 14
Operating and loosening As received from
16 6.13 20 ± 5 4 1
torques sequence 8
As received
17 Flame resistance 6.18 800 to 1 000 5 1
(if applicable)
As received
18 Ignition 6.16 20 ± 5 — 3
(if applicable)
Acetylene As received
19 6.17 20 ± 5 — 3
decomposition (if applicable)
20 Impact test — As received 20 ± 5 — 3

12 © ISO 2007 – All rights reserved

ISO 22435:2007(E)
6.5 Test method for mechanical strength
6.5.1 All tests shall be performed on one sample.
6.5.2 For an adjustable pressure VIPR, ensure that the pressure adjusting device is in the position where
the pressure regulator valve is closed.
For a pre-set VIPR, plug the outlet.
6.5.3 Hydraulically pressurize the high pressure side of the VIPR as indicated in 5.16.1, for 2 min.
For this test, replace the high pressure gauge, if fitted, by a plug.
6.5.4 Pressurize the low pressure chamber of the VIPR as indicated in 5.16.1, for 2 min.
For this test, replace the diaphragm, relief valve and low-pressure gauge, if fitted, by plugs.
6.6 Test methods for flow and pressure performance for regulators without flow metering
devices
6.6.1 Number of samples
All tests shall be performed on one sample.
6.6.2 Test method for standard discharge, Q , and rated outlet pressure, p
1 2
An example of the test bench required for this test is shown in Figure 1. The bench should be constructed in
such a way that the inlet and outlet pressures can be regulated separately. The equipment can be operated by
remote control.
The gas supply for the working pressure, p , and the test inlet pressure, p , should have sufficient capacity for
w 3
the tests.
All the pipelines of the pressure installation together with the valve controlling the flow should have a flow
capacity greater than that of the VIPR being tested. The VIPR can be supplied from a buffer cylinder.
Carry out the test at the standard discharge, Q , and the outlet pressure, p , stated by the manufacturer.
1 2
With the flow control valve closed, apply an inlet pressure, p . Set the outlet pressure to p . Gradually open
3 2
the flow control valve unt
...