EN 521:2006

SLOVENSKI STANDARD
01-april-2006
1DGRPHãþD
SIST EN 521:1999
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Specifications for dedicated liquefied petroleum gas appliances - Portable vapour
pressure liquefied petroleum gas appliances
Festlegungen für Flüssiggasgeräte - Tragbare, mit Dampfdruck betriebene
Flüssiggasgeräte
Spécifications pour les appareils fonctionnant exclusivement aux gaz de pétrole liquéfiés
- Appareils portatifs alimentés a la pression de vapeur des gaz de pétrole liquéfiés
Ta slovenski standard je istoveten z: EN 521:2006
ICS:
27.060.20
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 521
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2006
ICS 27.060.20 Supersedes EN 521:1998
English Version
Specifications for dedicated liquefied petroleum gas appliances -
Portable vapour pressure liquefied petroleum gas appliances
Spécifications pour les appareils fonctionnant Festlegungen für Flüssiggasgeräte - Tragbare, mit
exclusivement aux gaz de pétrole liquéfiés - Appareils Dampfdruck betriebene Flüssiggasgeräte
portatifs alimentés à la pression de vapeur des gaz de
pétrole liquéfiés
This European Standard was approved by CEN on 28 December 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, 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
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 521:2006: E
worldwide for CEN national Members.

Contents Page
Foreword .5
1 Scope .6
2 Normative references .7
3 Terms and definitions.7
4 Classification.11
4.1 Classification of gases: .11
4.2 Categories of appliances:.11
5 Safety requirements.12
5.1 General .12
5.2 Conversion to different gases.12
5.3 Materials .12
5.4 Assembly, cleaning and maintenance.12
5.5 Strength and stability .13
5.6 Soundness of the gas circuit assembly .14
5.7 Connections .14
5.8 Transport, fixing and mobility devices.16
5.9 Taps .16
5.10 Control handles.17
5.11 Injectors.18
5.12 Ignition devices.18
5.13 Flame supervision devices.18
5.14 Burners and radiant elements.19
5.15 Grids .19
5.16 Turnspit .19
5.17 Fireguards for heating appliances.20
5.18 Locations and compartments for refillable gas containers.20
5.19 Verification of the heat inputs.21
5.20 Resistance to overheating.21
5.21 Temperature of various parts of the appliance.21

5.22 Temperature of panels (floors, walls or ceilings) .22
5.23 Ignition, crosslighting and flame stability.22
5.24 Resistance to draught .22
5.25 Resistance to liquid spillage.23
5.26 Combustion.23
5.27 Accumulation of un-burnt gas .23
5.28 Safety at high temperature.23
5.29 Sooting - condensation .23
5.30 Rational use of energy.23

6 Test methods.24
6.1 General .24
Table 1 — Characteristics of the test gases .25
Table 2 — Test conditions.26
6.2 Conversion to different gases.26
6.3 Materials .26
6.4 Assembly, cleaning and maintenance.26
6.5 Strength and stability .26
6.6 Soundness of the gas circuit assembly .29
6.7 Connections .29
6.8 Transport, fixing and mobility devices.31
6.9 Taps .31
6.10 Control handles.31
6.11 Injectors.31
6.12 Ignition devices.31
6.13 Flame supervision devices .31
6.14 Burners and radiant elements.32
6.15 Grids .32
6.16 Turnspit .32
6.17 Fireguards for heating appliances.32
6.18 Locations and compartments for refillable gas containers.33
6.19 Verification of heat inputs .33
6.20 Resistance to overheating .34
6.21 Temperatures of the various parts of the appliance .35
6.22 Temperature of panels (floor, wall or ceiling).36
6.23 Ignition, crosslighting and flame stability.36
6.24 Resistance to draught .38
6.25 Resistance to liquid spillage.38
6.26 Combustion.39
6.27 Accumulation of un-burnt gases .40
6.28 Safety at high temperature.40
6.29 Sooting - condensation .41
6.30 Rational use of energy.41
Table 3 — Vessel diameter and mass of water relative to the burner heat input.41
7 Marking.43
7.1 Appliance marking.43
7.2 Packaging marking .43
8 Instructions for use, maintenance and assembly .43
Figure 1 — Cross section of a valve with centre boss .46

Figure 2 — Adaptor .47
Figure 3 — Tolerances of valve and adaptor threads .48
Figure 4 — Relative dimensions of the opening of the valve by the adaptor .49
Figure 5 — Tolerance on rate .50
Figure 6 — Apparatus for the test of resistance to thermal shock.50
Figure 7 — Test clamp.51
Figure 8 — Test probe.52
Figure 9 — Verification of the combustion of individual hotplate burners - Sampling device .53
Figure 10 — Verification of the combustion of all burners - Sampling device .54
Annex A (normative) Characteristics of test vessels (see 6.5.2.3).55
Figure A.A1 .55
Table A.A1 — Characteristics of pans necessary for testing.56
Annex B (normative) Tests on needle valves (see 6.9).57
B.1 Resistance to temperature .57
B.2 Endurance .58
Annex C (informative) Examples of authorized solutions.59
Figure C.C1 .59
Figure C.C2 Figure C.C3.60
Figure C.C4 Figure C.C5.61
Figure C.C6 Figure C.C7. 62
Annex ZA (informative) Clauses of this European Standard addressing essential requirements or
other provisions of EU Directive. 63
Table ZA.1. 63
Bibliography. 66

Foreword
This European Standard (EN 521:2006) has been prepared by Technical Committee CEN/TC 181 “Dedicated
liquefied petroleum gas appliances”, the secretariat of which is held by AFNOR.
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 August 2006, and conflicting national standards shall be withdrawn at
the latest by August 2006.
This European Standard supersedes EN 521:1998.
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
This European Standard only applies to type testing.
In 2001 the Netherlands raised a formal objection in respect of 5.7.2.1 "appliances fitted to pierceable
cartridges" of standard EN 521:1998, on the grounds that it does not fully satisfy the essential requirements of
Directive 90/396/EEC.
The decision of the commission was that the standard EN 521:1998 shall continue to confer the presumption
of conformity to the relevant provisions of Directive 90/396/EEC.
At the same time, the European mandate M/327 was created, with the aim of taking into account the risks
emerged by the particular condition of the replacement of the gas cartridge in portable (camping) gas
appliances, in order to improve the intrinsic level of safety with regards to the replacement of the cartridge.
The revision of this European Standard is an answer to this mandate M/327.
In the view of answering to this mandate, CEN/TC 181/WG 4 carried out a study on the pierceable appliances,
whose conclusions are integrated in this European Standard. The modifications brought to this European
Standard are focused on 5.7.2.1, and are the answer to the mandate M/327.
A new informative annex (Annex C) is also included, and supplements the changes brought to paragraph
5.7.2.1. It gives examples of authorized solutions, which specify the connecting requirements regarding the
replacement of pierceable cartridges.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, 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.
1 Scope
This European Standard specifies the construction and performance characteristics related to safety and the
rational use of energy of portable appliances burning liquefied petroleum gases at the vapour pressure within
the gas container. It also defines test methods and the requirements for marking and the information to be
given in the instructions.
NOTE These appliances are referred to in the body of the text as "appliances".
This European Standard applies to various types of portable appliances burning liquefied petroleum gases at
vapour pressure and designed to be used with (non refillable) cartridges as complying with EN 417 or any
types of gas cylinders other than cartridges. For example the following types of appliances are covered:
a) cooking appliances (hotplates, grills, barbecues.).
This European Standard does not cover barbecues that can be used indoors;
b) lighting appliances;
c) heating appliances.
This European Standard only applies to appliances with a maximum heat input of up to 3 kW (H ) for
s
outdoor use only;
d) blowlamps.
This European Standard only applies to blowlamps without a flexible hose;
e) laboratory burners.
The requirements apply to these appliances or their functional sections whether or not the latter are
independent or incorporated into an assembly.
This European Standard only applies to type examination.
Appliances covered by this European Standard are not connected to a flue for the discharge of products of
combustion and are not connected to the mains electricity supply.
This European Standard covers neither appliances supplied with LPG in the liquid phase nor those
incorporating a fixed gas reservoir which may or may not be refilled by the user. This European Standard does
not cover gas containers or flexible hose.
It does not apply to smokers’ lighters covered by EN ISO 9994.
Requirements for rational use of energy have been included for hotplate burners.
However, such requirements have not been included for the other types of appliances because:
 for grills and barbecues, this is a type of cooking which is achieved by various means such as radiant
elements; in addition this type of cooking varies according to the type of food and region where the
appliance is used;
 for lighting appliances, the consumption is insignificant because these appliances have a very low rate
and are used only for a few hours in a year;
 for heating appliances, all the heat produced is discharged into the environment;
 for tools such as blowtorches which are not professional tools in regular use, the gas consumption
depends very much on the way it is used.
2 Normative references
The following referenced documents are indispensable for the application of this European Standard. For
dated references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 30-1-1, Domestic cooking appliances burning gas fuel — Part 1-1: Safety — General
EN 125, Flame supervision devices for gas burning appliances — Thermo-electric flame supervision devices
EN 549, Rubber materials for seals and diaphragms for gas appliances and gas equipment
EN 60335-1:2002, Household and similar electrical appliances — Safety — Part 1: General requirements (IEC
60335-1:2001, modified)
ISO 301, Zinc alloy ingots intended for casting
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1
cooking device
devices supplied with the appliance designed to hold or receive the food to be cooked
NOTE grid, turnspit, baking tray etc.
3.2
detachable
possible to dismantle without using a tool
3.3
vapour pressure appliance
pressure at the inlet of the appliance is equal to the pressure in the gas container.
If the appliance is fixed directly to the gas cylinder by a rigid connection, the appliance inlet is the part of the
connection that takes the gas from the cylinder. A pressure reducing device may be incorporated in the gas
circuit, between the gas inlet and the injector.
If the appliance is connected to the gas container by a flexible hose, the pressure in the flexible hose once it is
connected to the gas container is equal to the pressure in the gas container. A pressure reducing device may
be incorporated in the gas circuit downstream of the flexible hose
3.4
appliance with fixed integral container
appliance incorporating a gas container which is not intended to be disconnected for refilling
NOTE See Clause 1
3.5
auxiliary equipment
control and device that can affect the safety of operation of a gas appliance
NOTE for example valves, flame supervision devices
3.6
barbecue
appliance designed principally to roast and/or grill food. Cooking is carried out by radiant heat and, possibly,
by convection
3.7
locking of an adjuster
action performed by the manufacturer or by an installer, in its adjustment position by any means
NOTE e.g. a screw etc.
3.8
soft solder
solder for which the lowest temperature of the melting range, after application, is less than 450 °C
3.9
turnspit
cooking device enabling the rotation of the food to be roasted.
NOTE The rotation can be manual or using a mechanical or electrical motor (battery)
3.10
burner
component that allows the gas to burn.
 ignition burner: small burner whose flame is designed to light a main burner. It is referred to as "pilot" in
this European Standard;
 main burner: burner designed to fulfil a thermal function of the appliance. It is referred to as "burner"
in this European Standard
3.11
gas cartridge
non-refillable container with a maximum capacity of 1 000 ml filled with gas or a gas mixture.
It may be fitted with a valve. If it is not fitted with a valve, the release of gas is carried out following perforation
of the cartridge by means of a device incorporated in the appliance
3.12
heat input
product of the mass rate and the gross calorific value of the gas brought to the same reference conditions.
NOTE It is expressed in kilowatts. The nominal heat input of a burner is the value of the heat input declared by the
manufacturer
3.13
flame lift
phenomenon characterized by the partial or total movement of the base of the flame away from the burner
port
3.14
removable
removal only possible with a tool
3.15
ignition device
device to ignite one or more burners directly or indirectly
3.16
flame supervision device
device which, due to the presence of a flame on the sensing element, keeps open the gas flow to the burner
and any pilot and which cuts off the gas supply to the burner and possibly a pilot in the event of extinction of
the supervised flame
3.17
grid
cooking device designed to hold the food to be cooked.
NOTE Its useful component(s) can be rigid or flexible
3.18
grid with flexible useful components

made up of two jointed components enabling tight gripping of the food to be cooked.
NOTE Each component consists of a rigid frame on which metallic wires are fixed and form a flexible mesh inside the
frame distorting around the food
3.19
griddle
part of a hotplate consisting of a plate placed above a burner, that allows the cooking of food by direct contact
with the surface of the plate which is brought to a high temperature
3.20
radiant grill
appliance or part of an appliance allowing cooking by radiation from a surface brought to a high temperature
3.21
pan support
support placed above an open hotplate burner and designed to support the pan to be heated
3.22
glass panel
glass surface or part of a glass surface allowing the inside of an enclosure to be seen
3.23
injector
component part that admits the gas into an aerated burner
NOTE An injector is said to be calibrated when the section of the outlet orifice is fixed.
3.24
control handle
component designed to be operated manually so as to operate a control of the appliance
NOTE e.g. a tap, thermostat etc.
3.25
means of sealing
static or dynamic device designed to ensure soundness
NOTE for example: flat-faced joints, O-ring or conical joints, diaphragms, grease, pastes, putties etc.
3.26
gripping area
outside part of the appliance designed to be handled in normal use
3.27
primary air adjuster
device allowing the primary aeration rate of a burner to be set to a predetermined value according to the
supply conditions.
NOTE The action consisting in operating this device is termed "primary air adjustment"
3.28
gas rate adjuster
device allowing the gas rate to a burner to be set at a predetermined value according to the supply conditions.
NOTE 1 The adjustment can be continuous (adjustment screw) or discontinuous (change of calibrated orifices).
NOTE 2 The action of changing the setting of this device is termed the "adjustment of the gas rate"
3.29
useful part of a cooking device
part of the device in contact with food during cooking
3.30
calorific value
quantity of heat produced by complete combustion at a constant pressure of 1 013,25 mbar, of unit mass of
the gas, the constituents of the gas mixture being at 0 °C or 15 °C, 1 013,25 mbar and the products of
combustion being brought to the same conditions.
NOTE 1 In this European Standard, the gross calorific value (symbol H ) is used, that is to say that the water produced
s
by combustion is assumed to be condensed.
NOTE 2 The calorific value is expressed in units of energy per unit of mass of dry gas. It is expressed in megajoules
per kilogramme (MJ/kg)
3.31
gas supply pressure
difference between the static pressure measured at the gas inlet connection of the appliance and the
atmospheric pressure. It is expressed in bar
3.32
hotplate
cooking appliance incorporating one or several burners and a pan support(s) designed in such a way that
it(they) can support the vessels containing the food
3.33
hotplate with grill
cooking appliance consisting of a hotplate and a radiant grill
3.34
light back
phenomenon characterized by the return of the flame inside the body of the burner
3.35
tap
device designed to isolate a burner from the gas supply pipework and possibly to adjust its rate during use
3.36
sealing of an adjuster
means of locking an adjuster, such that any attempt to change the adjustment causes the breaking of the
sealing device or sealing material and makes the interference with the adjuster apparent.
NOTE 1 The adjuster is said to be sealed in the adjusted position
NOTE 2 A factory sealed adjuster is considered as non existent
3.37
stabilizer
device which is integral with an appliance or which can be fixed to it designed to increase stability
3.38
flame stability
flames are stable at the burner ports when the phenomena of flame lift or light back do not occur
3.39
ignition delay time
time between the ignition of the supervised flame and the moment when the effect of this flame is sufficient to
keep the closing device open
3.40
extinction delay time
time between the extinction of the supervised flame and the closure of the gas supply to the burner and
possibly a pilot
4 Classification
4.1 Classification of gases:
Gases likely to be used are classified in three groups according to their pressures:
a) butane:
Mixture of hydrocarbons containing mainly butanes and butenes having a maximum pressure of 8 bar
gauge at 50 °C;
b) butane-propane mixture:
Mixture of hydrocarbons containing mainly butanes, butenes, propane and propene having a pressure
between 8 bar gauge and 12 bar gauge at 50 °C;
c) propane:
Mixture of hydrocarbons containing mainly propane and propene having a pressure above 12 bar gauge
at 50 °C.
4.2 Categories of appliances:
Appliances are classified in three categories according to the gases likely to be used:
 category direct pressure – butane;
 category direct pressure - butane-propane mixture;
 category direct pressure - propane.
5 Safety requirements
5.1 General
The test methods and the means of verification are indicated in Clause 6.
5.2 Conversion to different gases
Unless necessary so as to adjust the flame for various types of work (for example: tools such as blow lamps,
laboratory burners), the appliances shall not incorporate any adjuster (other than controlling the gas flow)
intended to be adjusted by the user.
5.3 Materials
Non-metallic materials used as radiant elements in appliances (for example volcanic rocks, refractory blocks)
shall be of a quality suitable to their use. The appliance manufacturer shall give the identification of the
element to be used in the user instructions.
The quality and thickness of materials used in the construction of appliances shall be such that the
constructional and performance characteristics are not altered in use. In particular all the parts of the
appliance shall withstand mechanical, chemical and thermal actions to which they may be submitted during
use. In normal conditions of operation, of cleaning or of adjustment, they shall not be liable to any alterations
which might impair their performance.
Sheet-metal parts, not made of corrosion-resistant material, shall be effectively protected against corrosion.
This requirement does not apply to grilles supporting lava rocks nor to cooking devices.
Seals and joining compounds shall have characteristics suited to their use.
Rubber based materials shall comply with EN 549.
Copper tubing shall be used upstream of the injector only if its temperature does not exceed 100 °C when the
test described in 6.21 is carried out.
Asbestos or asbestos based materials shall not be used.
The nature and finish of materials likely to be in contact with food shall be such that they cannot contaminate
or affect the food.
Zinc alloys shall not be used in contact with gas unless they are of ZnAl4 or ZnAl4Cu in accordance with
ISO 301 and provided that such parts do not exceed a temperature above 80 °C under the test conditions
in 6.21.
With the exception of seals, parts in contact with gas shall not be made of plastics.
5.4 Assembly, cleaning and maintenance
5.4.1 Assembly
The entire appliance gas circuit, including the injector, shall be assembled by the manufacturer.
Parts, whose assembly is carried out by the user, shall be able to be assembled correctly by following the
instructions given in the instructions.
It shall not be possible to dismantle parts which are adjusted at the factory, which are not intended to be
dismantled by the user and whose dismantling would affect safety, without using tools. If dismantling is
possible using an open ended spanner or a screwdriver, direct access to such nuts and screw heads shall not
be possible, unless they are sealed.
If a pressure reducing device is integrated in the gas circuit (see 3.3), it shall not be removable nor
replaceable by the user. This device may provide the functions of adjustment, opening and closing of the gas
flow.
The appliance gas circuit shall not incorporate a reservoir placed between the appliance gas inlet connection
and the valves, intended to receive part of the gas in the liquid phase contained in the supply vessel during
connection.
5.4.2 Cleaning, maintenance
All parts of the appliance requiring frequent cleaning by the user shall be easily accessible. It shall be possible
to put these parts back correctly.
There shall be no sharp corners and edges on the accessible parts of an appliance which could give rise to
injury, for example during cleaning.
5.5 Strength and stability
5.5.1 Strength
5.5.1.1 General
The construction of an appliance shall be such that, during normal conditions of use:
 any displacement of parts;
 any distortion;
 any deterioration
likely to impair safe operation will not occur.
5.5.1.2 Hotplate pan supports
The application of a mass as described in 6.5.1.2 on the pan support shall not cause any breakage or
permanent distortion of the pan support exceeding 1 mm.
5.5.1.3 Glass components
The accessible edges of glass components shall not be sharp. They shall withstand the various stresses to
which they are subjected during the tests described in this European Standard without damage. In particular
they shall withstand the tests described in 6.5.1.3.1 (when they are a part of the appliance) and in 6.5.1.3.2.
5.5.2 Stability
If the appliance is fitted with a foldable support, it shall be possible to lock this in the position of use (for
example: stop, locking device).
If the radiant device of a barbecue or a grill can have several positions, a stop shall be provided for each of
them.
The stability of an appliance designed to rest on a table or on the ground shall allow safe use on level ground.
In addition, the appliance shall not tilt or fall over when it is placed on a slope of 10° and any lid shall not close.
This requirement shall also be met when the appliance is fitted with optional parts (for example: lamp
extension posts).
These requirements shall be met under the test conditions described in 6.5.2.
5.6 Soundness of the gas circuit assembly
Holes for screws, pins, etc, intended for the assembly of components shall not open into the space reserved
for the gas ways leading to the injector.
The soundness of parts and assemblies connected to the gas circuit shall be assured by means of metal-to-
metal joints or joints with seals (for example, flat-faced joints, O-rings or gaskets), i.e. excluding the use of any
product which ensures soundness in the threads. For parts that do not require to be dismantled during normal
maintenance, for example taps, the use of thread sealing compounds is permitted.
Removable components or the threaded parts of the gas pipework which may be dismantled during normal
maintenance shall remain sound after five disconnections and re-connections in accordance with the
instructions, if necessary after changing a gasket.
Soft solder (see definition in 3.8) shall not be used to ensure the soundness of the gas circuit. However it is
permitted for internal connections within the gas circuit when they do not involve soundness. Conformity shall
be verified based on the manufacturer's specifications.
Under the test conditions defined in 6.6.1, during each of the tests no. 1 and 2, the leak shall not exceed
0,07 l/h (1 013 mbar, 20 °C). This requirement shall also be met after all the tests on the appliance have been
carried out, but before any dismantling of parts subjected to the soundness tests.
5.7 Connections
5.7.1 General
Whatever the type of gas container (pierceable cartridge, cartridge fitted with a valve, cartridge with or without
centre boss, refillable reservoir.), when following the instructions, connection of the appliance to the gas
container shall be easy with minimal, if any, gas leakage.
For appliances with direct rigid connection to the gas container(s), the CE Type Examination technical file for
the appliance shall include diagrams and specifications of the gas containers (including their gas outlet
connections) intended for the gas supply to the appliance.
5.7.2 Appliances directly fitted to the gas container
5.7.2.1 Appliances fitted to pierceable cartridges
a) design/construction of the appliance shall be such that there is no foreseeable replacement procedure
sequence possible which can lead to an unsafe and/or unintended piercing of the cartridge by the user.
(See in Annex C examples of authorized solutions);
b) The cartridge holder and the piercing device shall be such that:
1) the piercing is centred in the position provided;
2) soundness is ensured before piercing;
3) after the fitting of the cartridge, it shall not be possible to remove it, instantaneously and
unintentionally, without first having to remove the piercing device.
Diagrams showing the correct sequence for the fitting of the cartridge to the appliance shall be marked on the
appliance.
5.7.2.2 Appliances fixed onto cartridges with female valve and threaded centre boss as defined in
EN 417 (see Figure 1)
5.7.2.2.1 The female thread of the adaptor (Figure 2) designed to be fixed onto the thread of the centre
boss valve is defined as follows:
 7/16 in - 28 threads Unified Form Special - (see Figure 3);
 major diameter : 10,96 mm minimum;
 effective diameter : 10,66 mm to 10,75 mm;
 minor diameter : 10,20 mm to 10,27 mm.
5.7.2.2.2 The part of the adaptor, with a full thread, shall be 3,10 mm ± 0,1 mm long (see Figure 2 a)).
5.7.2.2.3 The thread shall penetrate fully into the seal groove without reduction in form.
5.7.2.2.4 A valve actuator shall be fixed on the axis of the adaptor in such a way that it allows the drawing
off of gas from a full cartridge in accordance with 5.7.1. The valve actuator shall allow the release of gas from
the cartridge when the appliance is screwed onto the valve with a minimum torque of 3 Nm.
5.7.2.2.5 The diameter of the valve actuator shall not exceed 2,20 mm if it is solid and shall be between
3,10 mm and 3,15 mm if it includes a gas way as indicated in Figure 2 b). The valve actuator shall be
concentric with the "7/16 in - 28 unified form thread" subject to a tolerance of 0,15 mm (see Figures 2 a) and
2 b)).
5.7.2.2.6 At the point where the valve actuator comes into contact with the valve seat, the valve actuator
diameter shall be at least 1,70 mm (see Figure 2 a)).
NOTE It is recommended that adaptor manufacturers contact manufacturers of cartridge valves to establish the
preferred design (see Figure 2 b)). The valve actuator shown in Figure 2 b) comes in contact with the inner seal of the
valve ensuring complete soundness when the cartridge is fitted.
5.7.2.2.7 A seal groove shall be machined at the bottom of the threaded part so as to centre and secure a
seal (see Figure 2 a)). This seal shall come into contact with the valve centre boss. The seal and the seal
groove shall be such that there is no visible and permanent distortion of the threaded centre boss when the
appliance is screwed onto the valve with a torque of 12 Nm.
5.7.2.2.8 The length of the valve actuator shall be such that it does not penetrate into the valve for a
distance exceeding 4,15 mm below the plane of the upper side of the centre boss (see Figure 4, dimension X)
when the appliance is screwed onto the valve with a torque of 12 Nm.
5.7.2.2.9 The inlet of the adaptor prior to the thread shall be a maximum of 2,00 mm deep and have a
diameter of between 11,0 mm and 12,0 mm. In addition, the inlet of the adaptor shall begin with a
1,0 mm × 45° chamfer (see Figure 2 a)).
5.7.2.2.10 The diameter of the adaptor which penetrates the valve seal groove shall not exceed 22,90 mm.
This part shall not extend more than 3,5 mm from the start of the adaptor thread (see Figure 2 a)).
5.7.2.2.11 The diameter of the adaptor beyond the 3,5 mm distance as defined in 5.7.2.2.10 shall be at least
30,0 mm. It shall be designed so as to rest on the rolled edge of the outer rim when fixing the appliance onto
its cartridge, and after the seal ensuring soundness has come in contact with the cartridge valve. If the
appliance incorporates other parts at this point (for example: blowlamp handles, plastic mouldings), the
requirements of 5.7.2.2.10 and 5.7.2.2.11 shall be met, when these parts are in position.
5.7.2.2.12 The requirements of 5.7.2.2 shall be verified under the test conditions given in 6.7.2.2.
5.7.3 Appliances connected to the gas container by a flexible hose
Appliances connected to the gas container by a flexible hose shall be supplied with the flexible hose fitted.
If clips are used, they
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