Automatic shut-off valves for gas burners and gas appliances

This European Standard specifies the safety, construction and performance requirements for automatic shut-off valves for use with gas burners, gas appliances and similar use, hereafter referred to as 'valves'. This European Standard is applicable to valves with declared maximum inlet pressures up to and including 500 kPa (5 bar) of nominal connection sizes up to and including DN 250 for use with one or more fuel gases in accordance with EN 437. This European Standard is applicable 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. This European Standard is also applicable to valves where the flow rate is controlled by external electrical signals, either in discrete steps or proportional to the applied signal. This European Standard is also applicable to valves fitted with closed position indicator switches. This European standard establishes methodologies for the determination of a Performance Level (PL) in accordance with EN 13611:2007+A2:2011, Annexes K and L.

Automatische Absperrventile für Gasbrenner und Gasgeräte

Diese Europäische Norm legt die Sicherheits-, Bau- und Funktionsanforderungen an automatische Absperr-ventile zur Verwendung mit Gasbrennern, Gasgeräten und ähnlichen Anwendungen, nachstehend Ventile genannt, fest.
Diese Europäische Norm gilt für Ventile mit angegebenen höchsten Eingangsdrücken bis einschließlich 500 kPa (5 bar) und Nennweiten bis einschließlich DN 250, die zur Verwendung mit einem oder mehreren Brenn¬gasen nach EN 437 ausgelegt sind.
Diese Europäische Norm gilt für elektrisch betriebene Ventile und für Ventile, die durch Steuermedien ange-steuert werden, wenn die Steuerventile für diese Medien elektrisch geschaltet werden; sie gilt nicht für externe elektrische Schalter, die das Steuersignal oder die Stellantriebsenergie beeinflussen.
Diese Europäische Norm gibt ein Bewertungsverfahren für die Auslegung und Konstruktion von Ventilen an.
Diese Europäische Norm gilt auch für Ventile, bei denen die Durchflussmenge durch externe elektrische Signale entweder in Stufen oder proportional zum angelegten Signal gesteuert wird.
Diese Europäische Norm gilt auch für Ventile mit Schaltern, die die geschlossene Stellung anzeigen.
ANMERKUNG   Bestimmungen für die Prüfung von Endprodukten durch den Hersteller sind nicht festgelegt.

Robinets automatiques de sectionnement pour brûleurs à gaz et appareils à gaz

La présente Norme européenne spécifie les exigences de sécurité, de construction et de fonctionnement des robinets automatiques de sectionnement pour brûleurs à gaz, appareils à gaz et similaires, dénommés ci-après «robinets».
La présente Norme européenne s'applique aux robinets dont la pression amont maximale déclarée est inférieure ou égale à 500 kPa (5 bar), de diamètres nominaux de raccordement inférieurs ou égaux à DN 250 utilisés avec un ou plusieurs combustibles gazeux conformément à l'EN 437.
La présente Norme européenne s'applique aux robinets de sectionnement commandés électriquement et aux robinets de sectionnement actionnés par des fluides si les vannes de commande de ces fluides sont commandées électriquement, mais en aucun cas aux dispositifs électriques externes commutant le signal de commande ou libérant l'énergie motrice de commande.
Une méthode d'évaluation de la conception des robinets est donnée par la présente Norme européenne.
La présente Norme européenne s'applique également aux robinets dans lesquels le débit est commandé par des signaux électriques externes, soit par pas, soit proportionnellement au signal reçu.
La présente Norme européenne s'applique également aux robinets équipés de contacts indicateurs de position de fermeture.
NOTE   Les dispositions relatives aux contrôles et aux essais du produit final par le fabricant ne sont pas spécifiées.

Samodejni zaporni ventili za plinske gorilnike in plinske aparate (z dopolnili do vključno A3)

Ta evropski standard določa zahteve v zvezi z varnostjo, konstrukcijo in lastnostmi za samodejne zaporne ventile, ki se uporabljajo s plinskimi gorilniki, plinskimi aparati in podobnimi napravami (v nadaljevanju: ventili). Ta evropski standard se uporablja za ventile z deklariranim najvišjim vhodnim tlakom do vključno 500 kPa (5 bar) in nazivnimi velikostmi priključkov do vključno DN 250 za uporabo z enim ali več gorivnimi plini v skladu s standardom EN 437. Ta evropski standard se uporablja za električno upravljane ventile in ventile, prožene s tekočino, pri katerih se ventili za upravljanje prožijo električno, vendar za preklapljanje pogonske energije ali krmilnega signala ne uporabljajo zunanjih električnih naprav. Ta evropski standard določa metodo za ocenjevanje izdelave ventilov. Ta evropski standard se uporablja tudi za ventile, pri katerih stopnjo pretoka upravljajo zunanji električni signali v nepovezanih korakih ali sorazmerno z uporabljenim signalom. Ta evropski standard se uporablja tudi za ventile s kazalniki preklopa zaprtega položaja. Ta evropski standard določa metode za ugotavljanje ravni delovanja (PL) v skladu z dodatkoma K in L standarda EN 13611:2007+A2:2011.

General Information

Status
Withdrawn
Publication Date
18-Jun-2013
Withdrawal Date
14-Nov-2022
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
07-Nov-2022
Due Date
30-Nov-2022
Completion Date
15-Nov-2022

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Automatische Absperrventile für Gasbrenner und GasgeräteRobinets automatiques de sectionnement pour brûleurs à gaz et appareils à gazAutomatic shut-off valves for gas burners and gas appliances27.060.20Plinski gorilnikiGas fuel burners23.060.10Zapirni ventili (kroglasti)Globe valvesICS:Ta slovenski standard je istoveten z:EN 161:2011+A3:2013SIST EN 161:2011+A3:2013en,fr,de01-julij-2013SIST EN 161:2011+A3:2013SLOVENSKI

STANDARDSIST EN 161:2011+A2:20131DGRPHãþD
SIST EN 161:2011+A3:2013
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 161:2011+A3
January 2013 ICS 23.060.10 Supersedes EN 161:2011+A2:2012English Version
Automatic shut-off valves for gas burners and gas appliances
Robinets automatiques de sectionnement pour brûleurs à gaz et appareils à gaz

Automatische Absperrventile für Gasbrenner und Gasgeräte This European Standard was approved by CEN on 20 February 2011 and includes Amendment 2 approved by CEN on 10 June 2012 and Amendment 3 approved by CEN on 10 November 2012.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 161:2011+A3:2013: ESIST EN 161:2011+A3:2013

EN 161:2011+A3:2013 (E) 2 Contents Page Foreword ..............................................................................................................................................................4 1 Scope ......................................................................................................................................................6 2 Normative references ............................................................................................................................6 3 Terms and definitions ...........................................................................................................................7 4 Classification ..........................................................................................................................................8 5 Units of measurement and test conditions .........................................................................................9 6 Construction requirements ...................................................................................................................9 7 Performance ........................................................................................................................................ 14 8 EMC/Electrical requirements ............................................................................................................. 22 9 Marking, installation and operating instructions ............................................................................ 24 Annex A (informative)

Gas connections in common use in the various countries ................................... 26 Annex B (informative)

Leak-tightness test – volumetric method ................................................................ 27 Annex C (informative)

Leak-tightness test – pressure loss method ........................................................... 28 Annex D (normative)

Conversion of pressure loss into leakage rate ......................................................... 29 Annex E (normative)

Electrical/electronic component fault modes ........................................................... 30 Annex F (normative)

Additional requirements for safety accessories and pressure accessories as defined in EU Directive 97/23/EC ....................................................................................................... 31 Annex G (normative)

Materials for pressurized parts .................................................................................. 32 Annex H (informative)

Additional materials for pressurized parts .............................................................. 33 Annex I (normative)

Requirements for controls used in DC supplied gas burners and gas burning appliances ........................................................................................................................................... 34 Annex AA (normative)

%Method for the determination of Performance Level (PL)& .......................... 35 Annex BB (informative)

%Model of a FMEA for valves& ......................................................................... 38 Annex ZA (informative)

Relationship between this European Standard and the Essential Requirements of EU Directive 2009/142/EC relating to appliances burning gaseous fuels ....... 55 Bibliography ..................................................................................................................................................... 57

Tables Table 1 — Test pressure ................................................................................................................................... 15 Table 2 — Sealing force requirements .............................................................................................................. 18 Table 3 — Operating cycles .............................................................................................................................. 21 Table 4 — Operating cycles for automatic shut-off valves for cookers according to EN 30-1-4:2002, 5.3.7.1 . 21 Table AA.1 – Scoring result of EN 13611:2007+A2:2011 for valves ................................................................. 36 SIST EN 161:2011+A3:2013

EN 161:2011+A3:2013 (E) 3 Table BB.1 — Example of a FMEA for a single seated valve to determine the SFF ......................................... 40 Table BB.2 — Failure Fields ............................................................................................................................... 51 Table BB.3 — Illustration of the used terms in Table BB.1 ................................................................................ 53 Table ZA.1 — Correspondence between this European Standard and Directive 2009/142/EC relating to appliances burning gaseous fuels ............................................................................................................... 55

SIST EN 161:2011+A3:2013
EN 161:2011+A3:2013 (E) 4

Foreword This document (EN 161:2011+A3:2013) has been prepared by Technical Committee CEN/TC 58 “Safety and control devices for burners and appliances burning gaseous or liquid fuels”, 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 2013, and conflicting national standards shall be withdrawn at the latest by July 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes %EN 161:2011+A2:2012&. This document includes Amendment 2, approved by CEN on 2012-06-10 and Amendment 3 approved by CEN on 2012-11-10. The start and finish of text introduced or altered by amendment is indicated in the text by tags #$ and %&. This document is intended to be used in conjunction with #EN 13611:2007+A2:2011$. This document refers to clauses of #EN 13611:2007+A2:2011$ or adapts clauses by stating “with the following modification”, “with the following addition”, “is replaced by the following” or "is not applicable" in the corresponding clause. This European Standard adds clauses or sub-clauses to the structure of

#EN 13611:2007+A2:2011$ which are particular to this European Standard i.e. sub-clauses or annexes, which are additional to those in #EN 13611:2007+A2:2011$, are numbered starting from 101 or are designated as Annex AA, BB, CC etc. It should be noted that these clauses and sub-clauses are not indicated as an addition. %At the time of publication of Amendment 2, Amendment 1 was still at the draft stage. Therefore, there will be no Amendment 1 for this project. The present document incorporates the changes of the original Amendment 1 and Amendment 2.& It should be noted that the following significant editorial changes compared to the previous edition have been incorporated in this European Standard:

a) alignment to #EN 13611:2007+A2:2011$; b) normative references: ISO 4400 and ISO 6952 are changed to EN 175301-803; c) terms and definitions are aligned to #EN 13611:2007+A2:2011$; d) %sub-clause 6.2.105, Balanced valves, has been changed; e) sub-clause 6.2.107, Additional requirements for shut-off function, has been changed;& f) sub-clause 6.101 has been moved to sub-clause 8.11.102; g) %sub-clause 7.105.1, Sealing force requirements, has been changed;& h) installation and operating instructions are integrated in one sub-clause; SIST EN 161:2011+A3:2013

EN 161:2011+A3:2013 (E) 5 i) %addition of new Annexes AA and BB;& j) changes in Annex ZA regarding 1.2, 1.2.2, 1.2.3, 1.3, 3.1.1, 3.3, 3.6, 3.7, 3.8, 3.11, 3.12, 3.2.1 and in addition Annex II and III were deleted.

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. %Primarily in industrial applications it is common practice to rate the safety of a plant based on values describing the likelihood of a dangerous failure. These values are being used to determine Safety Integrity Levels or Performance Levels when the system is being assessed in its entirety. CEN/TC 58 standards for safety relevant controls do go beyond this approach, because for a certain life span for which the product is specified, designed and tested a dangerous failure is not allowed at all. Failure modes are described and assessed in greater detail. Measures to prevent dangerous situations occurring are defined. Field experience over many decades is reflected in the CEN/TC 58 standards. Requirements of these standards can be considered as proven in practice. The PL assessment in Annex AA is only applicable to automatic shut-off valves which are already certified to this European Standard. It cannot be presumed that any Safety Integrity Level or Performance Level assessment alone would imply that requirements of a CEN/TC 58 standard have been met.

To be able to provide parameters to allow for any formal Safety Integrity Level or Performance Level system assessment the Annexes AA and BB of this document define a methodology to derive the relevant parameters from the requirements of this standard.& According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

SIST EN 161:2011+A3:2013
EN 161:2011+A3:2013 (E) 6

1 Scope This European Standard specifies the safety, construction and performance requirements for automatic shut-off valves for use with gas burners, gas appliances and similar use, hereafter referred to as ‘valves’.

This European Standard is applicable to valves with declared maximum inlet pressures up to and including 500 kPa (5 bar) of nominal connection sizes up to and including DN 250 for use with one or more fuel gases in accordance with EN 437. This European Standard is applicable 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. This European Standard is also applicable to valves where the flow rate is controlled by external electrical signals, either in discrete steps or proportional to the applied signal. This European Standard is also applicable to valves fitted with closed position indicator switches. NOTE Provisions for final product inspection and testing by the manufacturer are not specified. %This European standard establishes methodologies for the determination of a Performance Level (PL) in accordance with EN 13611:2007+A2:2011, Annexes K and L.& 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 EN 298, Automatic gas burner control systems for gas burners and gas burning appliances with or without fans #EN 13611:2007+A2:2011$, Safety and control devices for gas burners and gas burning appliances — General requirements 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 modified + A1:2001 (Equivalent) SIST EN 161:2011+A3:2013

EN 161:2011+A3:2013 (E) 7 EN 175301-803, Detail Specification: Rectangular connectors — Flat contacts, 0,8 mm

thickness, locking screw not detachable

3 Terms and definitions For the purposes of this document, the terms and definitions given in #EN 13611:2007+A2:2011$ and the following apply. 3.101 automatic shut-off valve valve which opens when energized and closes automatically when de-energized 3.102 actuating mechanism part of the valve which moves the closure member 3.103 valve with step control valve which controls the flow rate in steps 3.104 valve with modulating control valve which controls the flow rate continuously between two limits in response to external electrical signals 3.105 closed position indicator switch switch fitted to a valve which indicates when the closure member is in the closed position 3.106 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. 3.107 opening force force required to move the closure member to the open position 3.108 closing force force available to close the valve, independent of any force provided by fuel gas pressure 3.109 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 3.110 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 3.111 actuating pressure hydraulic or pneumatic pressure supplied to the actuating mechanism of the valve SIST EN 161:2011+A3:2013

EN 161:2011+A3:2013 (E) 8 3.112 opening time time interval between energizing the valve and the attainment of the maximum or other defined flow rate 3.113 closing time time interval between de-energizing the valve and the closure member attaining the closed position 3.114 delay time time interval between energizing the valve and the start of flow 3.115 control valve valve which controls the fluid (e. g. compressed air) supplied to the actuating mechanism 3.116 rated voltage voltage declared by the manufacturer at which the valve may be operated 3.117 rated current current declared by the manufacturer at which the valve may be operated 3.118 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 control #EN 13611:2007+A2:2011$ is replaced by the following:  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 7.105. 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 7.105. 4.2 Groups of control Shall be according to #EN 13611:2007+A2:2011$, 4.2. SIST EN 161:2011+A3:2013

EN 161:2011+A3:2013 (E) 9 4.3 Classes of control functions Shall be according to #EN 13611:2007+A2:2011$, 4.3. 5 Units of measurement and test conditions Shall be according to #EN 13611:2007+A2:2011$, Clause 5.

6 Construction requirements 6.1 General Shall be according to #EN 13611:2007+A2:2011$, 6.1. 6.2 Mechanical parts of the control 6.2.1 Appearance Shall be according to #EN 13611:2007+A2:2011$, 6.2.1. 6.2.2 Holes Shall be according to #EN 13611:2007+A2:2011$, 6.2.2. 6.2.3 Breather holes Shall be according to #EN 13611:2007+A2:2011$, 6.2.3. 6.2.4 Test for leakage of breather holes Shall be according to #EN 13611:2007+A2:2011$, 6.2.4. 6.2.5 Screwed fastenings Shall be according to #EN 13611:2007+A2:2011$, 6.2.5. 6.2.6 Jointing Shall be according to #EN 13611:2007+A2:2011$, 6.2.6. 6.2.7 Moving parts Shall be according to #EN 13611:2007+A2:2011$, 6.2.7. 6.2.8 Sealing caps Shall be according to #EN 13611:2007+A2:2011$, 6.2.8. 6.2.9 Dismantling and reassembly Shall be according to #EN 13611:2007+A2:2011$, 6.2.9. SIST EN 161:2011+A3:2013

EN 161:2011+A3:2013 (E) 10 6.2.101 Design There shall be no exposed shafts or operating levers which could adversely affect the ability of valves to close. 6.2.102 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. 6.2.103 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. 6.2.104 Controls assembled to a valve Other controls assembled to a valve shall not interfere with its shut-off function. 6.2.105 Balanced valves # %deleted text& 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. For a balanced valve with one port a resulting force in the closing direction shall remain, if the balancing force is removed, and the closure member shall have the same closing direction as the flow direction through the valve.$. 6.2.106 Closing and sealing 6.2.106.1 Closing and/or sealing by means of springs If springs are used for closing and/or sealing the valve, they shall be designed according to EN 13906-1 or EN 13906-2 for static and dynamic loading. 6.2.106.2 Other means for closing and/or sealing

6.2.106.2.1 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 “class of control function A, B or C” is not related to the sealing force classes but to the class of control function as described in 4.3. Sealing force of valves shall be classified according to 4.1. SIST EN 161:2011+A3:2013

EN 161:2011+A3:2013 (E) 11 The basic risks of fire and explosion in a gas appliance as a result of uncontrolled gas flow requires a control function 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 class of control function of each of them being considered equal. Although this European Standard is not based on a fault assessment approach as specified in

#EN 13611:2007+A2:2011$, 6.6, the combination of two automatic shut-off valves is considered equal to a control function class C. This assumption is based on the construction and performance requirements of this European Standard. 6.2.106.2.2 New designs for closing and/or sealing New designs for closing and/or sealing shall fulfil at least the requirements of a control function class B. In all cases the gas shut-off function shall be a control function class C. NOTE For further information see EN 14459. During the testing, the valve shall fulfil the performance requirements of Clause 7. New designs may consist of a combination of closure members, electronic controller, sensing elements, actuators, lockout and reset. The manufacturer shall declare the other means for closing and/or sealing. For the assessment of the new design the requirements of this European Standard shall be used in combination with #EN 13611:2007+A2:2011$, 6.6. 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 #EN 13611:2007+A2:2011$, Annex E shall be included into the fault assessment. The outcome of the analysis shall provide a set of conditions under which the new design can be used in an automatic shut-off valve. These conditions involve construction requirements, safety requirements, performance requirements and test methods. The fault reaction time shall be declared by the manufacturer. Failure of mechanical parts adversely affecting the performance requirements of this European Standard is considered as an abnormal situation and can therefore be considered as a first fault according to the test method in #EN 13611:2007+A2:2011$, 6.6. SIST EN 161:2011+A3:2013

EN 161:2011+A3:2013 (E) 12 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. # 6.2.107 Additional requirements for shut-off function

6.2.107.1 Diaphragms that assist the shut-off function

Shut-off functions using a diaphragm to apply (part of) the closing force to the closure member shall be designed in such a way that, when the diaphragm is damaged, the closure member closes and the maximum internal leakage rate of the valve is limited to 1 dm³/h. Conformity shall be verified by the method given in 6.2.107.2.

6.2.107.2 Leakage test

Remove or rupture the part(s) assisting the shut-off function. De-energize the valve. Measure the internal leakage rate of the valve according to 7.3.$ 6.3 Materials 6.3.1 General material requirements Shall be according to #EN 13611:2007+A2:2011$, 6.3.1. 6.3.2 Housing Shall be according to #EN 13611:2007+A2:2011$, 6.3.2. 6.3.3 Test for leakage of housing after removal of non-metallic parts Shall be according to #EN 13611:2007+A2:2011$, 6.3.3. 6.3.4 Zinc alloys Shall be according to #EN 13611:2007+A2:2011$, 6.3.4. 6.3.5 Springs providing closing and/or sealing force Shall be according to #EN 13611:2007+A2:2011$, 6.3.5. 6.3.6 Resistance to corrosion and surface protection Shall be according to #EN 13611:2007+A2:2011$, 6.3.6. 6.3.7 Impregnation Shall be according to #EN 13611:2007+A2:2011$, 6.3.7. 6.3.8 Seals for glands for moving parts Shall be according to #EN 13611:2007+A2:2011$, 6.3.8. SIST EN 161:2011+A3:2013

EN 161:2011+A3:2013 (E) 13 6.3.101 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 15 kPa (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 Shall be according to #EN 13611:2007+A2:2011$, 6.4.1. 6.4.2 Connection sizes Shall be according to #EN 13611:2007+A2:2011$, 6.4.2. 6.4.3 Threads Shall be according to #EN 13611:2007+A2:2011$, 6.4.3. 6.4.4 Union joints Shall be according to #EN 13611:2007+A2:2011$, 6.4.4. 6.4.5 Flanges Shall be according to #EN 13611:2007+A2:2011$, 6.4.5. 6.4.6 Compression fittings Shall be according to #EN 13611:2007+A2:2011$, 6.4.6. 6.4.7 Nipples for pressure test Shall be according to #EN 13611:2007+A2:2011$, 6.4.7 with the following addition: Nipples for pressure test conforming to these requirements shall be used only up to and including 500 mbar. 6.4.8 Strainers Shall be according to #EN 13611:2007+A2:2011$, 6.4.8 with the following addition: 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. SIST EN 161:2011+A3:2013

EN 161:2011+A3:2013 (E) 14 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 Shall be according to #EN 13611:2007+A2:2011$, 6.5. 6.6 Protection against internal faults for the purpose of functional safety Shall be according to #EN 13611:2007+A2:2011$, 6.6. 6.101 Pneumatic and hydraulic actuating mechanisms Pneumatic or hydraulic 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 7.1 General Shall be according to #EN 13611:2007+A2:2011$, 7.1 with the following addition: Valves shall close automatically when de-energized or in the absence of actuating energy. Valves with DC supplies shall operate correctly from the minimum rated voltage to the maximum rated voltage, as declared by the manufacturer. For DC supplies type A, B, and C according to #EN 13611:2007+A2:2011$, Annex I.1 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. 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 6.2.106.2.2 shall be taken as part of the performance requirements, as specified in Clause 7. 7.2 Leak-tightness Shall be according to #EN 13611:2007+A2:2011$, 7.2 with the following addition: Balanced valves shall be leak-tight when tested with rates given in Table 1. SIST EN 161:2011+A3:2013

EN 161:2011+A3:2013 (E) 15 Table 1 — Test pressure Inlet pressure Test pressure p in flow direction kPa Maximum leakage rate

0 Pa ≤ p ≤ 50 kPa 2 × pmax For internal leak-tightness see values in

#EN 13611:2007+A2:2011$, Table 2 50 kPa < p ≤ 500 kPa p = pmax x [ 2 – ( pmax – 50)/900 ]

7.3 Test for leak-tightness 7.3.1 General Shall be according to #EN 13611:200
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