BS en 161-2007 Automatic Shut-Off Valves for Gas Burners and Gas Appliances

BRITISH STANDARD
BS EN 161:2007
Automatic shut-off valves for gas burners and gas appliances

ICS 23.060.40; 27.060.20

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BS EN 161:2007

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 February 2008

© BSI 2008

ISBN 978 0 580 55538 1

National foreword

This British Standard is the UK implementation of EN 161:2007. It supersedes BS EN 161:2002 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee GSE/22, Safety and control devices for gas and oil burners and gas burning appliances.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.

Amendments/corrigenda issued since publication

Date Comments

EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN 161

January 2007

ICS 23.060.40 Supersedes EN 161:2001

English Version

Automatic shut-off valves for gas burners and gas appliances

Robinets automatiques de sectionnement pour brûleurs àgaz et appareils à gaz

Automatische Absperrventile für Gasbrenner undGasgeräte

This European Standard was approved by CEN on 8 December 2006.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial 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 STANDARDIZATIONC OM ITÉ EUR OP ÉEN DE NOR M ALIS AT IONEUROPÄISCHES 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 reservedworldwide for CEN national Members.

Ref. No. EN 161:2007: E

EN 161:2007 (E)

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Contents Page

1 Scope ......................................................................................................................................................4 2 Normative references ............................................................................................................................4 3 Terms and definitions ...........................................................................................................................5 4 Classification..........................................................................................................................................7 5 Units of measurement and test conditions.........................................................................................7 6 Construction requirements...................................................................................................................8 7 Performance requirements .................................................................................................................13 8 EMC/Electrical requirements ..............................................................................................................21 9 Marking, installation and operating instructions .............................................................................22 Annex A (informative) Gas connections in common use in the various countries..................................25 Annex B (informative) Leak-tightness test — volumetric method .............................................................26 Annex C (informative) Leak-tightness test — pressure loss method ........................................................27 Annex D (normative) Conversion of pressure loss into leakage rate ........................................................28 Annex E (informative) Additional requirements coming from EU Directive 97/23/EC..............................29 Annex ZA (informative) Relationship between this European Standard and the Essential

Requirements of EU Directive 90/396/EEC........................................................................................30 Bibliography ......................................................................................................................................................32

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Foreword

This document (EN 161:2007) 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 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 July 2007, and conflicting national standards shall be withdrawn at the latest by July 2007.

This document supersedes EN 161:2001.

This document 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 is intended to be used in conjunction with prEN 13611:2005, Safety and control devices for gas burners and gas-burning appliances — General requirements. This control standard refers to clauses of prEN 13611:2005 or adapting it by stating “Addition”, “Modification” or “Replacement” in the corresponding clause. It introduces requirements for balanced valves and a method for the assessment of other means for closing and/or sealing in automatic shut-off valves.

SIL classification according to EN 61508 cannot be claimed based upon compliance with this standard. Valves with SIL classification do not meet automatically the requirements of this standard.

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 United Kingdom.

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EN 161:2007 (E)

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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 inlet pressures up to and including 5 bar, for use on burners or in appliances using fuel gases of the first, second, and third 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. An assessment method for valve designs is given by this European Standard.

It also applies to valves where the flow rate is controlled by external electrical signals, either in discrete steps or proportional to the applied signal.

It also applies to valves fitted with closed position indicator switches.

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.

EN 30 (all parts), Domestic cooking appliances burning gas fuel

EN 298, Automatic gas burner control systems for gas burners and gas burning appliances with or without fans

prEN 13611:2005, Safety and control devices for gas burners and gas-burning appliances — General require-ments

EN 13906-1, Cylindrical helical springs made from round wire and bar — Calculation and design — Part 1: Compression springs

EN 13906-2, Cylindrical helical springs made from round wire and bar — Calculation and design — Part 2: Extension springs

EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)

EN 60730-1:2000, Automatic electrical controls for household and similar use — Part 1: General requirements (IEC 60730-1:1999, modified)

EN 61058-1, Switches for appliances - Part 1: General requirements (IEC 61058-1:2000 + A1:2001, modified)

ISO 4400, Fluid power systems and components - Three-pin electrical plug connectors with earth contact - Characteristics and requirements

ISO 6952, Fluid power systems and components — Two-pin electrical plug connectors with earth contact –Characteristics and requirements

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3 Terms and definitions

For the purposes of this document, the terms and definitions given in prEN 13611:2005 and the following apply.

3.1 automatic shut-off valve valve which opens when energized and closes automatically when de-energized

3.2 closure member according to prEN 13611:2005, 3.2

3.3 actuating mechanism part of the valve which moves the closure member

3.4 external leak-tightness according to prEN 13611:2005, 3.4

3.5 internal leak-tightness according to prEN 13611:2005, 3.5

3.6 inlet pressure according to prEN 13611:2005, 3.6

3.7 outlet pressure according to prEN 13611:2005, 3.7

3.8 pressure difference according to prEN 13611:2005, 3.8

3.9 maximum inlet pressure according to prEN 13611:2005, 3.9

3.10 minimum inlet pressure according to prEN 13611:2005, 3.10 3.11 flow rate according to prEN 13611:2005, 3.11

3.12 rated flow rate according to prEN 13611:2005, 3.12

3.13 maximum ambient temperature according to prEN 13611:2005, 3.13

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3.14 minimum ambient temperature according to prEN 13611:2005, 3.14

3.15 mounting position according to prEN 13611:2005, 3.15

3.16 valve with step control valve which controls the flow rate in steps

3.17 valve with modulating control valve which controls the flow rate continuously between two limits in response to external electrical signals

3.18 closed position indicator switch switch fitted to a valve which indicates when the closure member is in the closed position

3.19 actuating energy required energy for the actuating mechanism to move the closure member to the open position

NOTE The actuating energy can have an external source (electrical, pneumatic or hydraulic) and can be transformed inside the valve.

3.20 opening force force required to move the closure member to the open position

3.21 closing force force available to close the valve, independent of any force provided by fuel gas pressure

3.22 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

3.23 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

3.24 actuating pressure hydraulic or pneumatic pressure supplied to the actuating mechanism of the valve

3.25 opening time time interval between energizing the valve and the attainment of the maximum or other defined flow rate

3.26 closing time time interval between de-energizing the valve and the closure member attaining the closed position

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3.27 delay time time interval between energizing the valve and the start of flow

3.28 control valve valve which controls the fluid (e. g. compressed air) supplied to the actuating mechanism

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

3.31 balanced valve valve with a balanced closure member where the inlet pressure acts on the closure member in the opening and closing direction

NOTE The closure member may close more than one opening.

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 7.13. Balanced valves according to this standard are class A valves.

Class D valves

Valves which are not subject for requirements for the sealing force and fixed closing time.

NOTE Class D valves are intended to be used for control functions only.

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 7.13.

4.2 Groups of valve

According to prEN 13611:2005, 4.2

4.3 Classes of control functions, safety classes


5 Units of measurement and test conditions

According to prEN 13611:2005, Clause 5

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6 Construction requirements

6.1 General


6.2 Mechanical parts of valves

6.2.1 Appearance

According to prEN 13611:2005, 6.2.1

6.2.2 Holes


6.2.3 Breather holes


6.2.4 Test for leakage of breather holes


6.2.5 Screwed fastenings


6.2.6 Jointing


6.2.7 Moving parts


6.2.8 Sealing caps


6.2.9 Dismantling and reassembly


6.2.10 Design

There shall be no exposed shafts or operating levers which could adversely affect the ability of valves to close.

6.2.11 Closed position indicator switch

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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6.2.12 Valve with modulating control

Flow rates of valves with modulating control shall be adjustable over the full range declared 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 mechanical or electrical tools and shall be designed to discourage unauthorized adjustment.

NOTE For air-gas ratio controls see EN 12067-1 and -2.

6.2.13 Controls assembled to a valve

Other controls assembled to a valve shall not interfere with its shut-off function.

6.2.14 Balanced valves

The closure member of a balanced valve shall have a resulting force in the closing direction where the sealing force is not decreased by the gas inlet pressure.

6.2.15 Closing and sealing

6.2.15.1 Closing and/or sealing by means of springs

If springs are used for closing and/or sealing the valve, they shall be designed to EN 13906-1 or EN 13906-2 for static and dynamic loading.

6.2.15.2 Other means for closing and/or sealing

6.2.15.2.1 General

This clause defines a method for the assessment of other means for closing and sealing in automatic shut-off valves.

By this clause the term “safety class A, B or C” is not related to the sealing force classes but to the safety classes as described in 4.3.

Sealing force of valves shall be classified according to 4.1.

The basic risks of fire and explosion in a gas appliance as a result of uncontrolled gas flow requires a safety class C system for the gas shut-off function. This is based on a comparison, made between automatic burner controller and gas shut-off function, the safety class of each of them being considered equal.

Although this European Standard is not based on a fault assessment approach as described in 6.6 of prEN 13611:2005, the combination of two automatic shut-off valves is considered equal to safety class C requirement. This assumption is based on the construction and performance requirements of this European Standard.

6.2.15.2.2 New designs for closing and/or sealing

New designs for closing and/or sealing shall fulfil at least safety class B requirements. In all cases the gas shut-off function shall be a class C function.

NOTE For further information see prEN 14459.

During the testing the valve shall fulfil the performance requirements of Clause 7.

New designs may consist of a combination of closure members, electronic controller, sensing elements, actuators, lockout and reset.

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The manufacturer shall declare the other means for closing and/or sealing.

For the assessment of the new design the requirements of this European Standard shall be used in combination with 6.6 of prEN 13611:2005. If this leads to aspects that are not described in this European Standard, the manufacturer shall supply a failure mode analysis on the new design.

This analysis shall describe the specific failure modes for the type of technology used in relation to the following basic safety requirements:

a) closing function at power interruption;

b) leak tightness;

c) sealing force (ability to withstand backpressure, to be checked by testing or calculation);

d) closing force > friction force;

e) closing time including the influence to the Burner Control (EN 298);

f) no uncontrolled opening of the automatic shut-off valve.

As a result of this failure mode analysis, additional constructional requirements shall be fulfilled and/or additional faults compared to Annex E of prEN 13611:2005 shall be included into the fault assessment.

The outcome of the analysis shall provide a set of conditions under which the new design can be used in an automatic shut-off valve. These conditions involve construction requirements, safety requirements, performance requirements and test methods.

The fault reaction time shall be declared by the manufacturer.

Failure of mechanical parts adversely affecting the performance requirements of this European Standard is considered as an abnormal situation and can therefore be considered as a first fault according to the test method in 6.6 of prEN 13611:2005.

However, if mechanical parts are designed according to the constructional requirements of Clause 6 of this European Standard, failure of these parts is not considered.

6.3 Materials

6.3.1 General material requirements


6.3.2 Housing


6.3.3 Test for leakage of housing after removal of non-metallic parts


6.3.4 Zinc alloys


6.3.5 Springs providing closing and/or sealing force


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6.3.6 Resistance to corrosion and surface protection


6.3.7 Impregnation


6.3.8 Seals for glands for moving parts


6.3.9 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 inlet pressure above 150 mbar;

parts transmitting the closing force.

The strength of the connection between closure members of a balanced valve shall be at least five multiplied by the maximum inlet pressure multiplied by the total opening area of the closure members.

6.4 Gas connections

6.4.1 Making connections


6.4.2 Connection sizes


6.4.3 Threads


6.4.4 Union joints


6.4.5 Flanges


6.4.6 Compression fittings


6.4.7 Nipples for pressure test


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Addition:

Nipples for pressure test conforming to these requirements shall be used only up to and including 500 mbar.

6.4.8 Strainers


Addition:

6.4.8.1 Where an inlet strainer is fitted to class A, B, C, and D 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.

6.4.8.2 Strainers fitted to valves of DN 25 and above shall be accessible for cleaning or replacement without removing the valve body by dismantling threaded or welded pipework.

6.5 Electronic parts of valves


6.6 Protection against internal faults for the purpose of functional safety


6.7 Electrical equipment

6.7.1 Degree of protection

The degree of protection shall be declared by the manufacturer in accordance with EN 60529.

6.7.2 Switches

Switches shall conform to EN 61058-1. The number of operating cycles shall be in accordance with Table 3 of this European Standard.

6.7.3 Plug connections

Valves supplied with an assembled electrical plug connector in accordance with ISO 6952 or ISO 4400 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

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Closed position indicators

Pin 4 (e) earth contact

Pin 1 common

Pin 2 open valve

Pin 3 closed valve

6.7.4 Power saving circuits

6.7.4.1 Closing of the valve

Valves with power-saving circuits shall be designed such that any fault in the power-saving circuit does not affect the correct closing and the leak-tightness of the valve.

If the power-saving circuit has an independent power supply it has to fulfil 6.6.4 of prEN 13611:2005.

6.7.4.2 Overheating

If the power-saving circuit meets the requirement of 6.6.4 of prEN 13611:2005 the test under 6.7.4.3 does not apply.

6.7.4.3 Test of power-saving circuits

Energize the valve according to 7.1 of this European Standard at maximum rated voltage or current and at maximum ambient temperature for a period of at least 24 h under no flow conditions with the power saving circuit taken out of function. Without de-energizing the valve, slowly reduce the voltage or current to 15 % of the minimum rated value. Verify that the valve has closed and remains tight.

6.8 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 performance requirements as given in Clause 7.

7 Performance requirements

7.1 General


Addition:

Valves shall close automatically when de-energized or in the absence of actuating energy.

Valves with DC supplies shall operate correctly from the minimum rated voltage to the maximum rated voltage, as declared by the manufacturer.

For DC supplies type A, B, and C according to H.1 of prEN 13611:2005 a tolerance of 20 % to the minimum and the maximum rated voltage applies. For DC supplies of other types the tolerance shall be declared by the manufacturer.

The electrical control valve of pneumatic or hydraulic actuating mechanisms shall also meet these requirements.

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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.

Aspects coming from new designs for closing and/or sealing according to 6.2.15.2.2 shall be taken as part of the performance requirements, as specified in Clause 7.

7.2 Leak-tightness


Addition:

Balanced valves shall be leak-tight when tested with rates given in Table 1.

Table 1 — Test pressure

Inlet pressure Test pressure p in flow direction

mbar

0 mbar ≤ p ≤ 500 mbar 2 × pmax

500 mbar < p ≤ 5000 mbar p = pmax x [ 2 – ( pmax – 500)/9000 ]

Maximum leakage rate

for internal leak-tightness

see values in prEN 13611:2005, Table 2

7.3 Test for leak-tightness

7.3.1 General


7.3.2 External leak-tightness


7.3.3 Internal leak-tightness


Addition:

For balanced valves pressurize the inlet to test pressures given in 7.2 and measure the leakage rate.

7.4 Torsion and bending


7.5 Torsion and bending tests


7.6 Rated flow rate


Addition:

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7.6.1 Valves with modulating control

Where the manufacturer declares opening and closing characteristics for valves with modulating control, these shall be within ±10 % of the manufacturer’s declared value.

7.6.2 Valves with step control

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 7.7.

7.6.3 Valves with electrical control

When the flow rate changes in response to external electrical signals, it shall not, when tested to 7.7, 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.

7.7 Test for rated flow rate

7.7.1 Apparatus


7.7.2 Test procedure


Addition:

For valves with modulating or step control verify the declared opening and closing characteristics at rated voltage or current before and after the endurance test for conformity with 7.6.1 to 7.6.3.

7.7.3 Conversion of air flow rate


7.8 Durability


7.9 Closing function concerning remanence

7.9.1 Requirement

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 the maximum rated value including the tolerance according to 7.1.

In all cases, the closing time shall be in accordance with 7.12.

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7.9.2 Test of 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 the maximum rated value increased by the tolerance according to 7.1, keeping the actuating pressure, if any, unchanged. De-energize the valve and verify that it has closed. For AC valves, remove the voltage at the peak of the current waveform.

Energize the valve at the maximum rated voltage or current and at the maximum actuating pressure, if applicable. Reduce the voltage or current to a value between 15 % of the minimum rated value and the maximum rated value decreased by the tolerance according to 7.1, keeping the actuating pressure, if any, unchanged. De-energize the valve and verify that it has closed. Carry out this test at 3 different voltages or currents between 15 % of the minimum rated value and the maximum rated value decreased by the tolerance according to 7.1.

7.10 Closing force

7.10.1 Requirement

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 an inlet pressure above 500 mbar.

7.10.2 Test of closing force

This measurement is carried out in the ungreased condition.

Measure the minimum closing force over the travel of the closure member from the open position to the closed position.

Remove the spring(s) providing the closing force from the valve and measure the maximum force required to move the closure member from the open position to the closed position.

7.11 Delay time and opening time

7.11.1 Requirement

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 ≤ 1 s.

7.11.2 Test of delay time and opening time

Measure the time interval between energizing the valve and the start of the release of the closure member.

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Measure the time interval between energizing the valve and the attainment of a flow rate equal to 80 % of the rated flow rate.

Carry out the tests under the following conditions, allowing the de-energized valve to reach thermal equilibrium before carrying out the tests:

at 60 °C (or at the maximum ambient temperature, if higher), at the maximum inlet pressure, at the maximum rated voltage or current increased by the tolerance according to 7.1, and at the maximum actuating pressure, if applicable;

at 0 °C (or at the minimum ambient temperature, if lower), at an inlet pressure of 6 mbar, at the minimum rated voltage or current decreased by the tolerance according to 7.1, and at the minimum actuating pressure, if applicable.

7.12 Closing time

7.12.1 Requirement

7.12.1.1 Closing time for safety shut-down

The closing time for valves shall not exceed 1 s when tested to 7.12.2 except:

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.

7.12.1.2 Closing time for controlling function

The closing time for any controlling function shall be within ±10 % of the manufacturer’s declared value.

7.12.2 Test of closing time

Measure the time interval between de-energizing the valve and the closure member attaining the closed position, under the following conditions:

at the maximum inlet pressure, at a pressure difference declared by the manufacturer, at the maximum rated voltage or current increased by the tolerance according to 7.1, and at the maximum actuating pressure, if applicable;

at an inlet pressure of 6 mbar, at the minimum pressure difference declared by the manufacturer, at the maximum rated voltage or current increased by the tolerance according to 7.1, and at the maximum actuating pressure, if applicable.

7.13 Sealing force

7.13.1 Requirement

Class A, B and C valves shall have a minimum sealing force over the closure member orifice area in accordance with Table 2 when tested to 7.13.2.

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Table 2 — Sealing force requirements

Valve Test pressure

mbar Maximum leakage rate

Class A 150

Class B 50

Class C 10

for internal leak-tightness

see values in prEN 13611:2005 Table 2

The test pressure opposing the flow direction is given in Table 2 and tested to 7.13.2.

For balanced valves with more than one opening of the closure member the force of the closing spring shall be calculated to be at least 50 % of the total opening area multiplied by 150 mbar multiplied by 1,25.

The test pressure opposing the flow direction for balanced valves with more than one opening of the closure member is 300 mbar.

Class J valves shall have a minimum sealing force of 1 N 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.

Where the test methods of 7.13.2 are unsuitable for other designs of valve, 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 2, as appropriate to the class of valve.

7.13.2 Test of sealing force

7.13.2.1 Class A, B, C, and balanced valves

7.13.2.1.1 General

Connect an air supply through a flow meter to the outlet of the valve such that the air pressure opposes the closing direction of the closure member.

Energize and de-energize the valve twice.

7.13.2.1.2 Class A, B, and C valves

Pressurize the valve slowly to the appropriate pressure given in Table 2 and measure the leakage rate after the test system is stabilized.

7.13.2.1.3 Balanced valve

Pressurize the valve slowly to the appropriate pressure given in 7.13.1 and measure the leakage rate after the test system is stabilized.

7.13.2.2 Class J valve

Remove the spring(s) providing the sealing force and measure the spring force at a spring compression corresponding to the closed position of the valve.

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7.14 Closed position indicator switch

7.14.1 Requirement

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.

7.14.2 Test of closed position indicator switch

Modify a single valve to enable the closure member to be moved and positioned in any partially open position. Slowly move the closure member until the switch just indicates valve closure.

7.15 Endurance

7.15.1 Requirement

This endurance test may be combined with 7.10 of prEN 13611:2005, where applicable.

After the endurance test described in 7.15.2 the valve shall conform to the requirements of 7.2, 7.3, 7.9, and 7.11 to 7.14.

For any setting according to 7.6.1 to 7.6.3 within the manufacturer’s declared adjustment range, the flow rate at the end of the endurance test described in 7.15.2 shall be within ± 10 % of the flow rate before the endurance test, when measured under the same conditions according to 7.7.

7.15.2 Endurance test

Carry out tests for external leak-tightness to 7.3.2 and internal leak-tightness to 7.3.3 and performance requirements to 7.1, before the endurance test, after the test at 60 °C and after the test at 20 °C.

Energize the valve at the maximum rated voltage or current increased by the tolerance according to 7.1, at maximum ambient temperature for a period of at least 24 h under no flow conditions. Without de-energizing the valve, slowly reduce the voltage or current to 15 % of the minimum rated value. Verify that the valve has closed.

Connect the gas inlet to an air supply at the maximum inlet pressure. Do not exceed 10 % of the maximum rated flow rate.

Operate the valve to the number of cycles given in Table 3 with a cycle period of no less than that declared by the manufacturer. Ensure that the valve travels to the fully open and fully closed position during each cycle.

Carry out the part of the endurance test at maximum ambient temperature, at the maximum rated voltage or current.

For the test at 20 °C, carry out 50 % of the cycles at the maximum rated voltage or current and 50 % at the minimum rated voltage or current.

If the minimum ambient temperature is below 0 °C, carry out the following endurance test at the minimum rated voltage or current:

for valves up to and including DN 150, carry out 25 000 cycles at −15 °C. Reduce the number of cycles for the test at 20 °C by 25 000 cycles;

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for valves above DN 150, carry out 5 000 cycles at –15 °C. Reduce the number of cycles for the test at 20 °C by 5 000 cycles.

Where the valve has a pneumatic or hydraulic actuating mechanism, carry out the endurance test at the maximum actuating pressure.

Check the operation of the valve throughout the endurance test, for example by monitoring the outlet pressure or the flow rate.

Finally, re-test the valve to 7.9.2.

Table 3 — Operating cycles

Number of cycles at: Nominal size

DN Maximum ambient temperature

– at least (60 ±±±± 5) °C

(20 ±±±± 5) °C

DN ≤ 25 Opening time ≤ 1 s maximum inlet pressure ≤ 150 mbar

100 000 400 000

DN ≤ 25 Opening time ≤ 1 s maximum inlet pressure >150 mbar

50 000 150 000

DN ≤ 25 Opening time > 1 s 50 000 150 000

25 < DN ≤ 80 25 000 75 000

80 < DN ≤ 150 25 000 25 000

150 < DN ≤ 250 5 000 20 000

Table 4 — Operating cycles for automatic shut-off valves for cookers according to EN 30-1-4:2002, 5.3.7.1

Number of cycles at: Nominal size

DN Maximum ambient

temperature – at least (60 ±±±± 5) °C

(20 ±±±± 5) °C

DN ≤ 25 Opening time ≤ 1 s maximum inlet pressure ≤ 150 mbar

800 000 200 000

7.15.3 Endurance test for closed position indicator switch

Carry out the endurance test described in 7.15.2 on an unmodified valve with the maximum inductive or capacitive load declared by the manufacturer on the closed position indicator switch.

During the test, monitor the switch to ensure that it indicates that the valve is closed when it is de-energized and open when energized.

After the endurance test, carry out the test for indication of closure according to 7.14.2.

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7.15.4 Flow characteristics

7.15.4.1 Valves with modulating control

In addition to 7.15.2, test the valve for opening to the lowest set point as declared by the manufacturer and to the mid-point in the closing direction according to 7.7.2.

7.15.4.2 Valves with step control

In addition to 7.15.2, test the valve for opening and/or closing to the mid-point of the adjustment range for each step according to 7.7.2.

8 EMC/Electrical requirements

8.1 Protection against environmental influences


8.2 Supply voltage variations below 85 % of rated voltage

Not applicable (covered by 7.9 of this European Standard)

8.3 Short term voltage interruptions and decreases


Addition:

Determine the influence of supply voltage interruptions by monitoring any change of flow through the valve at a pressure difference at the valve declared by the manufacturer.

8.4 Supply frequency variations


8.5 Surge immunity test


8.6 Electrical fast transient/burst


8.7 Immunity to conducted disturbances


8.8 Immunity to radiated fields


8.9 Electrostatic discharge immunity test


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8.10 Power frequency magnetic field immunity test


8.11 Electrical requirements


Addition:

Electrical equipment shall either be type tested or declared by the manufacturer.

Electrical equipment shall also comply with the relevant requirements of EN 60730-1:2000, Clauses 14 and 20. The test to Clause 13 of EN 60730-1 shall be carried out after the humidity test according to 7.8 of this European Standard.

9 Marking, installation and operating instructions

9.1 Marking

The following information, at least, shall be durably marked on the valve in a clearly visible position:

a) manufacturer and/or trade mark;

b) type reference;

c) class of valve;

d) maximum inlet pressure in mbar or bar (Pa or kPa);

e) ambient temperature range;

f) group 1 (if applicable).

In addition, the valve shall be marked with:

g) direction of gas flow (by a cast or embossed arrow);

h) date of manufacture (at least year) — may be in code;

i) marking of the earth connection (if applicable);

j) supply pressure for hydraulic or pneumatic actuator in mbar or bar (Pa or kPa), if applicable.

Valves with electrical actuating mechanisms shall additionally be marked with the following:

k) identification of terminals;

l) nature and frequency of supply voltage;

m) rated voltage in V or rated current in A and its related voltage in V;

n) rated load in VA, or in W if above 25 W;

o) degree of protection (IP-Code);

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p) symbol of Class II construction for Class II valves (if applicable).

Additional electrically operated devices which are integral parts of the valve, shall be provided with the same information.

9.2 Installation instructions

One set of instructions shall be supplied with each consignment, written in the language(s) of the country into which the valves will be delivered.

It shall include all relevant information on installation, in particular:

a) class of valve (A, B, C, D or J);

b) group 1 or 2;

c) rated flow rate at a specified pressure difference;

d) electrical data;


f) mounting position(s);

g) inlet pressure range in mbar or bar (Pa or kPa);

h) gas connection(s);

i) strainer details;

j) information if usable as automatic shut off valve for cookers according to EN 30;

k) Notice for installer to consider e. g. condition for up-stream pressure, dirt, corrosion products;

l) Safety classification of the valve according to 4.3 if applicable.

9.3 Operating instructions

One set of instructions shall be supplied with each consignment, written in the language(s) of the country into which the valves will be delivered.

It shall include all relevant information on use and operation, in particular:

a) class of valve (A, B, C, D, or J);

b) group 1 or 2;

c) rated flow rate at a specified pressure difference;

d) electrical data;


f) opening time;

g) closing time (and maximum delay time if applicable);

h) mounting position(s);

i) inlet pressure range in mbar or bar (Pa or kPa);

j) gas connection(s);

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k) strainer details;

l) safety class identification for safety-related electronics (if applicable);

m) information if usable as automatic shut off valve for cookers according to EN 30;

n) Notice for installer to consider e. g. condition of upstream pressure, dirt, corrosion products.

Spare parts shall be used as declared by the manufacturer.

“Life time for safe function” shall be declared by the manufacturer.

9.4 Warning notice


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Annex A (informative)

Gas connections in common use in the various countries

According to prEN 13611:2005, Annex A

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Annex B (informative)

Leak-tightness test — volumetric method

According to prEN 13611:2005, Annex B

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Annex C (informative)

Leak-tightness test — pressure loss method

According to prEN 13611:2005, Annex C

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Annex D (normative)

Conversion of pressure loss into leakage rate

According to prEN 13611:2005, Annex D

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Annex E (informative)

Additional requirements coming from EU Directive 97/23/EC

According to prEN 13611:2005, Annex F

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Annex ZA (informative)

Relationship between this European Standard and the Essential

Requirements of EU Directive 90/396/EEC

This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association to provide a means of conforming to Essential Requirements of the New Approach Directive 90/396/EEC.

Once this standard is cited in the Official Journal of the European Union under that Directive and has been implemented as a national standard in at least one Member State, compliance with the clauses of this standard given in Table ZA confers, within the limits of the scope of this standard, a presumption of conformity with the corresponding Essential Requirements of that Directive and associated EFTA regulations.

Table ZA.1 - Correspondence between this European Standard and Directive 90/396/EEC

N/A = Not applicable EN = covered in prEN 13611:2005

Essential requirement Clauses of this European Standard

1 GENERAL CONDITIONS

1.1 Safety of operation EN, 1, 6, 7

1.2 Installation instructions EN, 9.2

User instructions EN, 9.3

Warning notices 9.4

Official language of instructions EN, 9.2, 9.3, 9.4

1.2.1 Installation instructions EN, 9.2

1.2.2 User instructions EN, 9.3

1.2.3 Warning notices EN, 9.4

1.3 Correct operation EN, 7, 9.2, 9.3

2 MATERIALS

2.1, 2.2 Suitability for safety and intended purpose EN, 6.3

3 DESIGN AND CONSTRUCTION

3.1 General

3.1.1 Mechanical stability EN, 6.1, 6.2

3.1.2 Condensation N/A

3.1.3 Risk of explosion EN

3.1.4 Water penetration N/A

3.1.5 Normal fluctuation of auxiliary energy EN, 7.1

3.1.6 Abnormal fluctuation of auxiliary energy EN, 7.9

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Table ZA.1 (continued)

Essential requirement Clauses of this European Standard

3.1.7 Hazards of electrical origin EN, 6.7, 8.11

3.1.8 Pressurized parts EN, Annex E

3.1.9 Failure of safety, controlling and regulating devices N/A

3.1.10 Safety/adjustment N/A

3.1.11 Protection of parts set by the manufacturer EN

3.1.12 Controlling and setting devices EN, 7.8

3.2 Unburned gas release

3.2.1 Gas leakage EN, 7.2, 7.3

3.2.2, 3.2.3 Gas accumulation N/A

3.3 Ignition N/A

3.4 Combustion N/A

3.5 Rational use of energy N/A

3.6 Temperatures N/A

3.7 Foodstuffs and water used for sanitary purposes N/A

ANNEX II

Certification procedures N/A

ANNEX III

CE conformity mark and inscriptions

1 Mark N/A

2 Data plate EN, 9.1

WARNING: Other requirements and other EU Directives may be applicable to the product(s) falling within the scope of this standard.

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Bibliography

[1] EN 12067-1, Gas/air ratio controls for gas burners and gas burning appliances - Part 1: Pneumatic types

[2] EN 12067-2, Gas/air ratio controls for gas burners and gas burning appliances - Part 2: Electronic types

[3] prEN 14459, Control functions in electronic systems for gas burners and gas burning appliances - Methods for classification and assessment

[4] ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances and designation

[5] EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions, tolerances and designation (ISO 228-1:2000)

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Documents

BS en 161-2007 Automatic Shut-Off Valves for Gas Burners and Gas Appliances