SIST EN 161:2002

SLOVENSKI STANDARD
SIST EN 161:2002
01-april-2002
1DGRPHãþD
SIST EN 161:1997
SIST EN 161:1997/A1:1997
SIST EN 161:1997/A2:1999
Samodejni zaporni ventili za plinske gorilnike in plinske aparate
Automatic shut-off valves for gas burners and gas appliances
Automatische Absperrventile für Gasbrenner und Gasgeräte
Robinets automatiques de sectionnement pour bruleurs a gaz et appareils a gaz
Ta slovenski standard je istoveten z: EN 161:2001
ICS:
23.060.20 Zapirni ventili (kroglasti in Ball and plug valves
pipe)
27.060.20 Plinski gorilniki Gas fuel burners
SIST EN 161:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 161:2002

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SIST EN 161:2002
EUROPEAN STANDARD
EN 161
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2001
ICS 23.060.40 Supersedes EN 161:1991
English version
Automatic shut-off valves for gas burners and gas appliances
Robinets automatiques de sectionnement pour brûleurs à Automatische Absperrventile für Gasbrenner und
gaz et appareils à gaz Gasgeräte
This European Standard was approved by CEN on 28 September 2001.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, 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
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 161:2001 E
worldwide for CEN national Members.

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SIST EN 161:2002
EN 161:2001 (E)
Contents
page
Foreword . 4
1 Scope. 5
2 Normative references. 5
3 Definitions. 6
4 Classification . 8
4.1 Classes of valve . 8
4.2 Groups of valve . 9
5 Units of measurement. 9
5.1 Dimensions. 9
5.2 Pressures . 9
5.3 Bending moments and torques . 9
6 Construction requirements . 10
6.1 General. 10
6.2 Materials . 11
6.3 Gas connections. 12
6.4 Seals for glands for moving parts. 13
6.5 Pressure test points. 13
6.6 Strainers . 13
6.7 Pneumatic and hydraulic actuating mechanisms. 14
6.8 Electrical equipment . 14
6.9 Power-saving circuits. 15
7 Performance requirements . 15
7.1 General. 15
7.2 Mounting position . 16
7.3 Closing function. 16
7.4 Closing force. 16
7.5 Delay time and opening time. 16
7.6 Closing time. 16
7.7 Leak-tightness . 17
7.8 Sealing force. 17
7.9 Torsion and bending. 18
7.10 Rated flow rate . 19
7.11 Closed position indicator switches . 19
7.12 Durability. 20
8 Methods of test. 21
8.1 Test conditions . 21
8.2 Mounting position . 21
8.3 Closing function. 21
8.4 Closing force. 21
8.5 Delay time and opening time. 21
8.6 Closing time. 22
8.7 Leak-tightness . 22
8.8 Sealing force. 23
8.9 Torsion and bending. 23
8.10 Rated flow rate . 26
8.11 Closed position indicator switches . 28
8.12 Durability. 28
8.13 Electrical equipment tests . 32
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SIST EN 161:2002
EN 161:2001 (E)
8.14 Power-saving circuits. 32
9 Marking, installation and operating instructions. 32
9.1 Marking. 32
9.2 Installation and operating instructions. 33
9.3 Warning notice. 33
Annex A (informative) Use of ISO 7-1:1994 and ISO 228-1:2000 threads for gas
connections (see 6.3.2.2) . 34
Annex B (informative) Leak-tightness test – Volumetric method . 35
Annex C (informative) Leak-tightness test – Pressure loss method . 37
Annex D (normative) Conversion of pressure loss into leakage rate . 39
Annex ZA (informative) Identification of clauses which meet the Essential
Requirements of the Gas Appliance Directive (90/396/EEC). 40
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SIST EN 161:2002
EN 161:2001 (E)
Foreword
This European Standard has been prepared by Technical Committee CEN/TC 58 "Safety and control
devices for gas burners and gas-burning appliances", the secretariat of which is held 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 May 2002, and conflicting national standards shall be
withdrawn at the latest by May 2002.
This European Standard replaces EN 161:1991 and prEN 1531:1994.
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
standard.
The annexes A, B, C and ZA are informative. Annex D is normative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,
Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
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SIST EN 161:2002
EN 161:2001 (E)
1 Scope
This European Standard specifies the safety, construction and performance requirements for
automatic shut-off valves for gas burners, gas appliances and similar use, hereafter referred to as
valves.
This European Standard covers type testing only.
It applies to valves with declared maximum working pressures up to and including 4 bar, for use on
burners or in appliances using fuel gases of the 1st, 2nd or 3rd families.
It applies to electrically operated valves and to valves actuated by fluids where the control valves for
these fluids are actuated electrically, but not to any external electrical devices for switching the control
signal or actuating energy.
It applies to valves where the flow rate is controlled by external electrical signals, either in discrete
steps or proportional to the applied signal.
It applies to valves fitted with closed position indicator switches.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text, and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references, the latest edition of the publication referred to applies (including
amendments).
EN 30-1-1:1998
Domestic cooking appliances burning gas fuel – Part 1-1: Safety - General.
EN 50165:1997
Electrical equipment of non-electric appliances for household and similar purposes – Safety
requirements.
EN 55011:1998
Industrial, scientific and medical (ISM) radio-frequency equipment – Radio disturbance charac-
teristics; limits and methods of measurement (IEC/CISPR 11: 1997, modified).
EN 55014-1:2000
Electromagnetic compatibility - Requirements for household appliances, electric tools and similar
apparatus - Part 1: Emission (CISPR 14-1:2000).
EN 55014-2:1997
Electromagnetic compatibility - Requirements for household appliances, electric tools and similar
apparatus - Part 2: Immunity product family standard (CISPR 14-2:1997).
EN 60529:1991
Classification of degrees of protection provided by enclosures (IP Code) (IEC 60529:1989).
EN 60730-1:1995
Automatic electrical controls for household and similar use - Part 1: General requirements (IEC
60730-1:1993, modified).
EN 61058-1:1992
Switches for appliances – Part 1: General requirements (IEC 61058-1:1990).
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SIST EN 161:2002
EN 161:2001 (E)
ISO 7-1:1994
Pipe threads where pressure-tight joints are made on the threads – Part 1: Dimensions, tolerances
and designation.
ISO 65:1981
Carbon steel tubes suitable for screwing in accordance with ISO 7-1.
ISO 228-1:2000
Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions,
tolerances and designation.
ISO 262:1998
ISO general purpose metric screw threads - Selected sizes for screws, bolts and nuts.
ISO 274:1975
Copper tubes of circular section – Dimensions.
ISO 301:1981
Zinc alloy ingots intended for casting.
ISO 1817:1999
Rubber, vulcanized - Determination of the effect of liquids.
ISO 4400:1994
Fluid power systems and components – Three-pin electrical plug connectors – Characteristics and
requirements.
ISO 6952:1994
Fluid power systems and components – Two-pin electrical plug connectors with earth contact –
Characteristics and requirements.
ISO 7005
Metallic flanges.
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1
automatic shut-off valve
valve which opens when energized and closes automatically when de-energized
3.2
valve with step control
valve which controls the flow rate in steps
3.3
valve with modulating control
valve which controls the flow rate continuously between two limits in response to external electrical
signals
3.4
closure member
movable part of the valve which shuts off the gas flow
3.5
actuating mechanism
part of the valve which moves the closure member
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SIST EN 161:2002
EN 161:2001 (E)
3.6
closed position indicator switch
switch fitted to a valve which indicates when the closure member is in the closed position
3.7
actuating energy
required energy for the actuating mechanism to move the closure member to the open position. The
actuating energy can have an external source (electrical, pneumatic or hydraulic) and can be
transformed inside the valve
3.8
opening force
force required to move the closure member to the open position
3.9
closing force
force available to close the valve, independent of any force provided by fuel gas pressure
3.10
sealing force
force acting on the valve seat when the closure member is in the closed position, independent of any
force provided by fuel gas pressure
3.11
frictional force
largest force required to move the actuating mechanism and the closure member from the open
position to the closed position with the closure spring removed, independent of any force provided by
fuel gas pressure
3.12
external leak-tightness
leak-tightness of a gas-carrying compartment with respect to atmosphere
3.13
internal leak-tightness
leak-tightness of the closure member (in the closed position) sealing a gas-carrying compartment with
respect to another compartment or to the outlet of the valve
3.14
inlet pressure
pressure at the inlet of the valve
3.15
outlet pressure
pressure at the outlet of the valve
3.16
maximum working pressure
highest inlet pressure declared by the manufacturer at which the valve may be operated
3.17
minimum working pressure
lowest inlet pressure declared by the manufacturer at which the valve may be operated
3.18
actuating pressure
hydraulic or pneumatic pressure supplied to the actuating mechanism of the valve
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SIST EN 161:2002
EN 161:2001 (E)
3.19
pressure difference
difference between the inlet and outlet pressures
3.20
flow rate
volume flowing through the valve in unit time
3.21
rated flow rate
air flow rate at a specified pressure difference declared by the manufacturer, corrected to reference
conditions
3.22
opening time
time interval between energizing the valve and the attainment of the maximum or other defined flow
rate
3.23
closing time
time interval between de-energizing the valve and the closure member attaining the closed position
3.24
delay time
time interval between energizing the valve and the start of flow
3.25
mounting position
position declared by the manufacturer for mounting the valve
3.26
control valve
valve which controls the fluid (e.g. compressed air) supplied to the actuating mechanism
3.27
maximum ambient temperature
highest temperature of the surrounding air declared by the manufacturer at which the valve may be
operated
3.28
minimum ambient temperature
lowest temperature of the surrounding air declared by the manufacturer at which the valve may be
operated
3.29
rated voltage
voltage declared by the manufacturer at which the valve may be operated
3.30
rated current
current declared by the manufacturer at which the valve may be operated
4 Classification
4.1 Classes of valve

Class A, B and C valves
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SIST EN 161:2002
EN 161:2001 (E)
Valves where the sealing force is not decreased by the gas inlet pressure. They are classified A,
B or C according to the sealing force requirements of 7.8.

Class D valves
Valves which are not subject to any sealing force requirements.

Class E valves
Valves where the sealing force is decreased by the gas inlet pressure and which meet the
requirements of 7.8.

Class J valves
Disc-on-seat valves where the sealing force is not decreased by the gas inlet pressure and which
meet the requirements of 7.8.
4.2 Groups of valve
A valve is classified as group 1 or group 2 according to the bending stresses which it is required to
withstand (see Table 4).

Group 1 valves
Valves for use in an appliance and/or installation where they are not subjected to bending
stresses imposed by installation pipework, (e.g. by the use of rigid adjacent supports).

Group 2 valves
Valves for use in any situation, either internal or external to the appliance, typically without
support.
NOTE A valve which meets the requirements of group 2 valves also meets the requirements of group 1 valves.
5 Units of measurement
5.1 Dimensions
Dimensions are given in millimetres.
5.2 Pressures
Pressures are static pressures relative to atmospheric pressure and are given in millibars or bars.
5.3 Bending moments and torques
Bending moments and torques are given in newton metres.
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SIST EN 161:2002
EN 161:2001 (E)
6 Construction requirements
6.1 General
6.1.1 Valves shall be designed, manufactured and assembled in such a way that they function
correctly when installed and used according to the manufacturer's instructions.
6.1.2 Valves shall be free from sharp edges and corners which could cause damage, injury or
incorrect operation.
All parts shall be clean internally and externally.
Dismantling and reassembly of valves shall require the use of tools. There shall be no exposed shafts
or operating levers which could adversely affect the ability of valves to close.
6.1.3 Holes for screws, pins, etc., which are used for the assembly of parts of the valve or for
mounting, shall not penetrate gasways.
The wall thickness between these holes and gasways shall be at least 1 mm.
6.1.4 Holes necessary during manufacture which connect gasways to atmosphere but which do not
affect the operation of the valve shall be permanently sealed by metallic means. Suitable jointing
compounds may additionally be used.
6.1.5 Closure parts, including those of measuring and test points, which may be dismantled for
servicing, adjustment or conversion, shall be constructed in such a way that leak-tightness in
accordance with 7.7 is achieved mechanically (e.g. metal to metal joints, O-rings) without the use of
jointing compounds such as liquids, pastes or tapes.
Jointing compounds, where used for permanent assemblies, shall remain effective under normal
operating conditions.
6.1.6 Parts which require dismantling, (e.g. for servicing) shall be capable of being dismantled and
reassembled using commonly available tools. They shall be constructed or marked in such a way that
incorrect reassembly is impossible when following the manufacturer’s instructions.
Screwed fastenings which may be removed during servicing shall have metric threads to
ISO 262:1998.
Self-tapping screws which cut a thread and produce swarf shall not be used for connecting gas-
carrying parts or parts which may be removed during servicing.
Self-tapping screws which form a thread and do not produce swarf may be used provided that they
can be replaced with metric machine screws conforming to ISO 262:1998.
6.1.7 The operation of moving parts, (e.g. diaphragms, bellows) shall not be impaired by other parts.
6.1.8 Soldering or other processes where the jointing material has a melting point below 450 °C
after application shall not be used for joining gas-carrying parts except for additional sealing.
6.1.9 Closed position indicator switches, where fitted, shall not impair the correct operation of
valves. Adjusters shall be sealed to indicate interference. Any drift of the switch and actuating
mechanism from its setting shall not impair correct valve operation.
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SIST EN 161:2002
EN 161:2001 (E)
Flow rates of valves with modulating control shall be adjustable over the full range declared
6.1.10
by the manufacturer. If the adjustment of one flow rate affects the setting of any other flow rate, this
shall be clearly indicated in the manufacturer's instructions for setting up. The setting of any flow rate
shall require the use of tools and shall be sealed to discourage unauthorized adjustment.
6.2 Materials
6.2.1 General material requirements
The quality of materials, the dimensions used and the method of assembling the various parts of the
valve shall be such that construction and performance characteristics are safe. Performance
characteristics of the valve shall not alter significantly during a reasonable life when installed and used
according to the manufacturer’s instructions. Under these circumstances, all components shall
withstand any mechanical, chemical, and thermal conditions to which they may be subjected during
service.
6.2.2 Zinc alloys
Zinc alloys shall only be used for gas-carrying parts of valves up to DN 50 with maximum working
pressures up to 200 mbar if of quality ZnAl4 to ISO 301:1981 and if the parts do not exceed a
temperature of 80 °C. Where the main inlet or outlet threaded connections are made of zinc alloys,
threads shall be external and conform to ISO 228-1:2000.
6.2.3 Housing
Parts of the housing which directly or indirectly separate a gas-carrying compartment from atmosphere
shall either be made from metallic materials, or shall be such that, on removal or fracture of non-
3
metallic parts other than O-rings, gaskets, seals and diaphragms, no more than 30 dm /h of air
escapes at the maximum working pressure, when tested to 8.7.2.2.
6.2.4 Closure members
Closure members of valves above DN 25 shall either have a mechanical support (e.g. metallic) to
withstand the sealing force or shall be made of metal.
This requirement also applies to:

all valves with a maximum working pressure above 150 mbar;

parts transmitting the closing force.
6.2.5 Springs providing closing force and sealing force
Closing force and sealing force shall be provided by spring action. Springs providing the closing and
sealing forces shall be designed for oscillating loads and for fatigue resistance. Springs with wire
diameter up to and including 2,5 mm shall be made from corrosion-resistant materials.
Springs with wire diameter above 2,5 mm shall either be made from corrosion-resistant materials or
shall be protected against corrosion.
6.2.6 Resistance to corrosion and surface protection
All parts in contact with gas or atmosphere, and springs other than those covered by 6.2.5, shall either
be made from corrosion-resistant materials or shall be suitably protected. The corrosion protection for
springs and other moving parts shall not be impaired by any movement.
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SIST EN 161:2002
EN 161:2001 (E)
6.2.7 Impregnation
Where impregnation is part of the manufacturing process, it shall be carried out using an appropriate
procedure, (e.g. vacuum or internal pressure, using appropriate sealing materials).
6.3 Gas connections
6.3.1 General
Valves above DN 80 shall be flanged to ISO 7005.
NOTE  In some countries there is a requirement for flanged connections above DN 50.
Equivalent connection sizes are given in Table 1.
Table 1 - Connection sizes
Nominal Designation of Nominal Outside diameter
size threads to size of range for tubes for
ISO 7-1:1994 or to flanges to compression
ISO 228-1:2000 ISO 7005 fittings
DN Inches mm mm
1
6 / 6
2  5
8
1
8 / 8
4 6  8
3
10 / 10
10  12
8
1
15 / 15
14  16
2
3
20 / 20 18  22
4
25 1 25
25  28
1
32 1 / 32
30  32
4
1
40 1 / 40
35  40
2
50 2 50 42  50
1
65 2 / 65 –  –
2
80 3 80 –  –
100 4 100 -  -
125 5 125 -  -
150 6 150 -  -
6.3.2 Threads
It shall be possible to make all gas connections using commonly available tools, e.g. by
6.3.2.1
suitable spanner flats on the valve body.
Inlet and outlet threads shall be to ISO 7-1:1994 or to ISO 228-1:2000 and shall be
6.3.2.2
chosen from the series given in Table 1.
NOTE Additional information on the use of these threads is given in annex A.
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SIST EN 161:2002
EN 161:2001 (E)
Where connections are made with union joints, either the joints shall be included with the
6.3.2.3
valve or full details shall be supplied if the threads do not conform to ISO 7-1:1994 or ISO 228-1:2000.
6.3.3 Flanges
Where flanges are used on valves above DN 50, they shall be suitable for connection to flanges to
ISO 7005, PN 6 or PN 16.
Where flanges are used on valves up to and including DN 50 which are not suitable for connection to
flanges to ISO 7005, either suitable adapters shall be supplied to enable connection to standard
flanges and threads, or full details of mating parts shall be supplied.
6.3.4 Compression fittings
Compression fittings shall be suitable for use with tubes of outside diameter to ISO 274:1975, Table 2.
It shall not be necessary to form the tubes before making connections. Olives shall be appropriate to
the tubes for which they are intended. Non-symmetrical olives may be used provided they cannot be
fitted incorrectly.
6.4 Seals for glands for moving parts
Seals for moving parts which pass through the body to atmosphere and seals for the closure member
shall be made only of solid, mechanically stable material of a type which does not deform
permanently. Sealing paste shall not be used.
Manually adjustable packing glands shall not be used for sealing moving parts.
NOTE  An adjustable gland set by the manufacturer and protected against further adjustment is considered to be
non-adjustable.
Bellows shall not be used as the sole sealing element against atmosphere.
6.5 Pressure test points
0
Pressure te
...