EN 161:2001

SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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.

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
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
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.
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).
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
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
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
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.
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.
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-
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.
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
6 / 6
2  5
8 / 8
4 6  8
10 / 10
10  12
15 / 15
14  16
20 / 20 18  22
25 1 25
25  28
32 1 / 32
30  32
40 1 / 40
35  40
50 2 50 42  50
65 2 / 65 –  –
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.
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
Pressure test points shall have an external diameter of ( 9 ) mm and a useful length of at
0,5
least 10 mm for connection to tubing. The equivalent diameter of the bore shall not exceed 1 mm.
6.6 Strainers
6.6.1 Where an inlet strainer is fitted to class A, B, C, D and E valves, the maximum strainer hole
dimension shall not exceed 1,5 mm and it shall prevent the passage of a 1 mm diameter pin gauge.
Class J valves shall incorporate an inlet strainer. The maximum strainer hole dimension shall not
exceed 0,28 mm and it shall prevent the passage of a 0,2 mm diameter pin gauge.
Where an inlet strainer is not fitted to a valve, the installation instructions shall include relevant
information on the use and installation of a strainer conforming to the above requirements, to prevent
the ingress of foreign matter.
Strainers fitted to valves of DN 25 and above shall be accessible for cleaning or replacement
6.6.2
without removing the valve body from the pipework.
6.7 Pneumatic and hydraulic actuating mechanisms
Pneumatically or hydraulically actuated valves shall be provided with protection to ensure that the
blockage of an orifice in the control system does not adversely affect the ability of the valve to close.
6.8 Electrical equipment
6.8.1 Electrical equipment shall conform to clause 9 of EN 60730-1:1995.
6.8.2 Insulating materials, live parts and non-detachable connections shall conform to 11.1 of
EN 60730-1:1995.
6.8.3 Protection against electric shock shall be in accordance with clause 8 and 11.2 of
EN 60730-1:1995.
6.8.4 The degree of protection shall be declared by the manufacturer in accordance with
EN 60529:1991.
6.8.5 Inlet openings shall conform to 11.9 of EN 60730-1:1995.
6.8.6 Any creepage or clearance distances which could cause unsafe operation of the valve shall
meet the requirements of 20.1 and 20.2 of EN 60730-1:1995.
6.8.7 Safety-related electronic circuits shall conform to annex H of EN 60730-1:1995.
6.8.8 Terminals and connections shall be declared by the manufacturer to conform to clause 10 of
EN 60730-1:1995.
6.8.9 Insulation resistance and electric strength shall be in accordance with 13.1 and 13.2 of
EN 60730-1:1995.
These tests shall be carried out after the humidity test in 8.12.7 of this standard.
6.8.10 Switches shall conform to EN 61058-1:1992. The number of operating cycles shall be in
accordance with Table 6 of EN 61058-1:1992.
6.8.11 Valves supplied with an assembled electrical plug connector in accordance with
ISO 6952:1994 or ISO 4400:1994 shall have connections to the following pins and to earth:

Single step valves
PE earth contact
Pin 1 N
Pin 2 L

Two step valves
Pin 4 (e) earth contact
Pin 1 N
Pin 2 L step 1
Pin 3 L step 2

Closed position indicators
Pin 4 (e) earth contact
Pin 1 common
Pin 2 open valve
Pin 3 closed valve
6.8.12 Valves shall meet the following EMC requirements:

19.101.2 of EN 50165:1997. For interruptions and decreases up to and including 20 ms, the valve
shall conform to the functional requirements of this standard and shall not show any significant
change in flow. For interruptions and decreases exceeding 20 ms, the valve shall operate safely.

19.101.4 to 19.101.8 of EN 50165:1997. At level 2, the valve shall not be influenced and shall
conform to the functional requirements of this standard. At level 3, the valve shall not show any
unspecified functional behaviour and shall be able to shut off the flow of gas.
NOTE  Valves should additionally meet the following EMC emission requirements where applicable:
Valves intended to be operated within household appliances: EN 55014-1:2000 and EN 55014-
2:1997;
Valves intended to be operated within industrial appliances: EN 55011:1998.
6.9 Power-saving circuits
Valves with power-saving circuits shall be designed such that any fault in the power-saving circuit
does not affect the correct closing of the valve.
If the power-saving circuit has been reviewed in accordance with EN 60730-1:1995 on a second fault
analysis the test under 8.14 does not apply.
7 Performance requirements
7.1 General
Valves shall close automatically when de-energized or in the absence of actuating energy.
They shall operate correctly under all combinations of the following:

the full range of working pressures;

the ambient temperature range from 0 °C to 60 °C or wider limits, if declared by the manufacturer;

the voltage or current range from 85 % to 110 % of the rated value or from 85 % of the minimum
rated value to 110 % of the maximum rated value.
The electrical control valve of pneumatic or hydraulic actuating mechanisms shall also meet these
requirements.
The closing of pneumatically or hydraulically actuated valves shall be ensured over the range from
85 % to 110 % of the actuating pressure or pressure range declared by the manufacturer.
7.2 Mounting position
Valves shall operate correctly in all mounting positions declared by the manufacturer.
7.3 Closing function
Valves shall close automatically on reducing the voltage or current to 15 % of the minimum rated
value.
Valves with pneumatic or hydraulic actuating mechanisms shall close automatically on reducing the
voltage or current to 15 % of the minimum rated voltage of the control valve.
Valves shall close automatically on removal of the voltage or current of between 15 % of the minimum
rated value and 110 % of the maximum rated value.
In all cases, the closing time shall be in accordance with 7.6.
7.4 Closing force
Valves with sealing force independent of the closing force (e.g. ball, guillotine valves etc.) shall have a
closing force of:

at least 5 times the value of the frictional force where the frictional force is up to and including 5 N;

at least 2,5 times the value of the frictional force but at least 25 N where the frictional force is
above 5 N.
The frictional force is measured in the ungreased condition.
This requirement also applies to disc-on-seat valves with a working pressure of 500 mbar and above.
7.5 Delay time and opening time
The delay time and the opening time shall be:

within  20 % of the manufacturer's declared value for times above 1 s;

less than 1 s for declared times up to and including 1 s.
7.6 Closing time
7.6.1 Closing time for safety shut-down
The closing time for valves of classes A, B, C and E shall not exceed 1 s when tested to 8.6.
The closing time for class D valves shall not exceed the manufacturer's declared value.
The closing time for class J valves shall not exceed 5 s or any lower value declared by the
manufacturer.
7.6.2 Closing time for controlling function
The closing time for any controlling function shall be within  10 % of the manufacturer’s declared
value.
7.7 Leak-tightness
Valves shall be leak-tight. They are considered to be leak-tight if the leakage rates given in Table 2 are
not exceeded when tested to 8.7.2.1 and 8.7.3.
Table 2 - Maximum leakage rates
Nominal inlet size Maximum leakage rates (in cm /h of air)
DN Internal leak-tightness External leak-tightness
DN < 10 20 20
40 40
10  DN  25
60 60
25 < DN  80
80 < DN  150 100 60
150 < DN 150 60
Closure parts (see 6.1.5) shall remain leak-tight after dismantling and reassembly.
7.8 Sealing force
Class A, B and C valves shall have a minimum sealing force over the closure member orifice area in
accordance with Table 3.
Table 3 - Sealing force requirements
Valve Test pressure Maximum leakage rate
mbar
Class A 150 see values in Table 2
Class B 50 for internal
Class C 10 leak-tightness
Class E valves shall have a minimum sealing force over the closure member orifice area equivalent to
a pressure of 1,5 times the maximum working pressure or at least 150 mbar in excess of the maximum
working pressure, whichever is the greater. The internal leakage shall not exceed the values given in
Table 2.
Class J valves shall have a minimum sealing force of 1 Newton for every metre length of seal. This is
calculated from the spring force in the closed position of the valve divided by the circumference or
length of the seal. The spring compression shall be declared by the manufacturer.
Valves which use the inlet pressure to compensate the force to the closure member can be class A, B
or C valves. Valves where the compensation area is greater than the closing member area shall be
classified as E valve.
Where the test methods of 8.8 are unsuitable for some designs of valve (e.g. valves with
compensation of inlet pressure), the sealing force shall be verified by calculation or by a combined
method of test and calculation. The minimum sealing force is calculated using pressures equal to
1,25 times the values given in Table 3, as appropriate to the class of valve.
7.9 Torsion and bending
7.9.1 General
Valves shall be constructed in such a way that they have adequate strength to withstand likely
mechanical stress to which they may be subjected during installation and service. After testing, there
shall be no permanent deformation, and any leakage shall not exceed the values specified in Table 2
for internal and external leakage.
7.9.2 Torsion – group 1 and group 2 valves with threaded connections
Valves shall be subjected to the torque given in Table 4 in accordance with 8.9.2.
7.9.3 Torsion – group 1 and group 2 valves with compression joints
Valves shall be subjected to the torque given in Table 4 in accordance with 8.9.3.
7.9.4 Bending – group 1 and group 2 valves
Valves shall be subjected to the bending moment given in Table 4 in accordance with 8.9.4.1. Group 1
valves shall additionally be tested to 8.9.4.2.
Table 4 - Torque and bending moment
Nominal size Torque Bending moment
1)
DN N·m N·m
Group 1 and 2 Group 1 Group 2
10 s 10 s 900 s 10 s
615 15 7 25
820 20 10 35
10 35 35 20 70
15 50 70 40 105
20 85 90 50 225
25 125 160 80 340
32 160 260 130 475
40 200 350 175 610
2)
50 250 520 260 1 100
2)
65 325 630 315 1 600
2)
80 400 780 390 2 400
100 – 950 475 5 000
125 – 1 000 500 6 000
– 1 100 550 7 600
 150
1) Equivalent connection sizes are given in Table 1.
2) Not applicable for valves with flanges
7.10 Rated flow rate
7.10.1 The maximum flow rate when measured according to 8.10 shall be at least 0,95 times the
rated flow rate.
7.10.2 Where the manufacturer declares opening and closing characteristics for valves with
modulating control, these shall be within  10 % of the manufacturer’s declared value.
7.10.3 For valves with step control, where applicable, the manufacturer shall declare the maximum
flow rate for each step as a percentage of the fully open flow rate. It shall not be possible to adjust the
maximum flow rate for each step in excess of 1,1 times the declared value when tested to 8.10.
7.10.4 When the flow rate changes in response to external electrical signals, it shall not, when tested
to 8.10, overshoot in either direction while attaining the new flow rate by more than 20 % of the flow
rate at that particular set point, or as declared by the manufacturer.
7.11 Closed position indicator switches
A closed position indicator switch shall indicate the closed position of the valve. The switch shall
indicate closure when either:

the flow rate is equal to or less than 10% of the equivalent fully open flow rate at the same
pressure difference; or

the closure member is within 1 mm of its closed position.
7.12 Durability
7.12.1 Elastomers in contact with gas
7.12.1.1 General
Elastomers in contact with gas (e.g. valve seals, O-rings, diaphragms and lip seals) shall be
homogeneous, free from porosity, inclusions, grit, blisters and other surface imperfections visible with
the naked eye.
7.12.1.2 Resistance to lubricants
The resistance to lubricants of elastomers shall be checked by an immersion test in test oil No. 2
carried out according to 8.12.1.2. After this test, the change of mass shall be between 10 % and
+10 %.
7.12.1.3 Resistance to gas
The resistance to gas of elastomers shall be checked by an immersion test using n-pentane (minimum
98 % by mass of n-pentane, estimated by gas chromatography) carried out according to 8.12.1.3.
After this test, the change of mass shall be between 15 % and +5 %.
7.12.2 Marking
Adhesive labels and all marking shall be resistant to abrasion, humidity and temperature and shall
neither lift nor discolour such that the marking becomes illegible.
This requirement shall be verified by the test described in 8.12.2.
Parts or assemblies intended by the manufacturer to be service exchangeable shall be clearly
identified.
7.12.3 Endurance
After the endurance test described in 8.12.3 the valve shall conform to the requirements of 6.2.5, 7.3,
7.5, 7.6, 7.7, 7.8 and 7.11.
For any setting according to 7.10.2, 7.10.3 and 7.10.4 within the manufacturer’s declared adjustment
range, the flow rate at the end of the endurance test described in 8.12.3 shall be within  10 % of the
flow rate before the endurance test, when measured under the same conditions according to 8.10.
7.12.4 Resistance to scratching
Surfaces exclusively protected with paint shall withstand the scratch test of 8.12.6 before and after the
humidity test of 8.12.7 without the ball penetrating the protective coating to expose bare metal.
7.12.5 Resistance to humidity
All parts including those with protected surfaces, (e.g. coated with paint or plating) shall withstand the
humidity test of 8.12.7 without any signs of corrosion, lifting or blistering visible with the naked eye.
8 Methods of test
8.1 Test conditions
Unless otherwise specified, carry out all tests using air at (20  5) °C at an ambient temperature of
(20  5) °C.
Correct all measured values to the following reference conditions:
15 °C, 1013,25 mbar, dry.
8.2 Mounting position
Carry out all tests in the mounting position declared by the manufacturer. Where there are several
declared mounting positions, carry out tests in the least favourable position.
8.3 Closing function
Energize the valve at the maximum rated voltage or current and at the maximum actuating pressure, if
applicable. Slowly reduce the voltage or current to 15 % of the minimum rated value. Verify that the
valve has closed.
Energize the valve at the maximum rated voltage or current and at the maximum actuating pressure, if
applicable. Increase the voltage or current to 110 % of the maximum rated value, keeping the
actu
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