SIST EN 88-1:2011+A1:2016

Pressure regulators and associated safety devices for gas appliances - Part 1: Pressure regulators for inlet pressures up to and including 50 kPa

This European Standard specifies the safety, construction and performance requirements for pressure regulators and pneumatic gas/air ratio pressure regulators (zero pressure regulators are included as a special type of pneumatic gas/air ratio pressure regulator), intended for use with gas burners, gas appliances and similar use, hereafter referred to as ‘pressure regulators’.
This European Standard is applicable to
-   pressure regulators with declared maximum inlet pressures up to and including 50 kPa (500 mbar) of nominal connection sizes up to and including DN 250 for use with one or more fuel gases in accordance with EN 437,
-   pressure regulators which use auxiliary energy,
-   pneumatic gas/air ratio pressure regulators, which function by controlling a gas outlet pressure in response to an air signal pressure, air signal differential pressure, and/or to a furnace pressure signal (zero pressure regulators are included as a special type of pneumatic gas/air ratio pressure regulator),
-   gas/air ratio pressure regulators which change an air outlet pressure in response to a gas signal pressure or a gas signal differential pressure.
This European Standard does not cover
-   pressure regulators connected directly to gas distribution network or to a container that maintains a standard distribution pressure,
-   pressure regulators intended for gas appliances to be installed in the open air and exposed to the environment,
-   mechanically linked gas/air ratio controls,
-   electronic gas/air ratio controls (EN 12067-2).

Druckregler und zugehörige Sicherheitseinrichtungen für Gasgeräte - Teil 1: Druckregler für Eingangsdrücke bis einschließlich 50 kPa

Diese Europäische Norm legt die Sicherheits-, Konstruktions- und Leistungsanforderungen an Druckregler und pneumatische Gas-Luft-Verbundregler fest (Nulldruckregler sind als besonderer Typ von pneumatischen Gas-Luft-Verbundreglern eingeschlossen), die für die Verwendung mit Gasbrennern, Gasgeräten und ähnlichen Geräten, vorgesehen sind, nachstehend als „Druckregler“ bezeichnet.
Diese Europäische Norm gilt für:
⎯
Druckregler mit Anschlussnennweiten bis einschließlich DN 250 mit angegebenen maximalen Eingangs-drücken bis einschließlich 50 kPa (500 mbar) für die Verwendung mit einem oder mehreren Brenngasen nach EN 437;
⎯
Druckregler, die elektrische Hilfsenergie benötigen;
⎯
pneumatische Gas-Luft-Verbundregler (Nulldruckregler sind als besonderer Typ von pneumatischen Gas-Luft-Verbundreglern eingeschlossen), die einen Gasausgangsdruck in Abhängigkeit von einem Luft-signaldruck, einem Luftsignal-Differenzdruck und/oder einem Feuerraumdrucksignal regeln;
- Gas-Luft-Verbundregler, die eine Änderung des Luftausgangsdrucks in Abhängigkeit von einem Gas-signaldruck oder einem - Gassignal-Differenzdruck regeln;
Diese Europäische Norm gilt nicht für:
- Druckregler, die unmittelbar an ein Gasverteilungsnetz oder an einen Behälter mit genormtem Verteilungsdruck angeschlossen sind;
- Druckregler für Gasgeräte in Freiluftausführung, die Umwelteinflüssen ausgesetzt sind;
- mechanisch verbundene Gas-Luft-Verbundregler;
- elektronische Gas-Luft-Verbundregler (EN 12067-2).

Régulateurs de pression et dispositifs de sécurité associés pour appareils à gaz - Partie 1: Régulateurs de pression pour pression amont inférieure ou égale à 50 kPa

La présente Norme européenne spécifie les exigences en termes de sécurité, de construction et de
fonctionnement des régulateurs de pression et des régulateurs pneumatiques de pression du rapport air/gaz
(les détendeurs à pression atmosphérique sont inclus à titre de modèle spécial de régulateur pneumatique de
pression du rapport air/gaz), destinés à équiper des brûleurs à gaz, des appareils à gaz et des dispositifs
analogues, désignés par la suite par « régulateurs de pression ».
La présente Norme européenne s'applique :
- aux régulateurs de pression supportant des pressions amont maximales déclarées inférieures ou égales
à 50 kPa (500 mbar), ayant un diamètre nominal de raccordement jusqu'à DN 250 inclus, et destinés à
être utilisés avec un ou plusieurs combustibles gazeux conformément à l'EN 437 ;
- aux régulateurs de pression alimentés par une énergie auxiliaire ;
- aux régulateurs pneumatiques de pression du rapport air/gaz, qui fonctionnent en délivrant une pression
de gaz en sortie en réponse à un signal de pression d’air, à un signal de pression différentielle d’air et/ou
à un signal de pression de combustion (les détendeurs à zéro sont inclus à titre de modèle spécial de
régulateurs pneumatiques de pression du rapport air/gaz) ;
- aux régulateurs de pression du rapport air/gaz qui font varier une pression d'air en sortie en fonction d’un
signal de pression de gaz ou d’un signal de pression différentielle de gaz.
La présente Norme européenne ne couvre pas:
- les régulateurs de pression raccordés directement au réseau de distribution de gaz ou à un récipient qui
maintient une pression de distribution normalisée ;
- les régulateurs de pression destinés à des appareils à gaz qui doivent être installés en plein air et
exposés aux intempéries ;
- les dispositifs de régulation du rapport air/gaz liés mécaniquement ;
- les dispositifs électroniques de régulation du rapport air/gaz (EN 12067-2).

Tlačni regulatorji in pripadajoče varnostne naprave za plinske aparate - 1. del: Tlačni regulatorji za vstopne tlake do vključno 500 mbar (50 kPa) (vključno z dopolnilom A1)

Ta evropski standard določa zahteve za varnost, izdelavo ter zmogljivost tlačnih regulatorjev in tlačnih regulatorjev z nadzorom razmerja med pnevmatskim plinom/zrakom (regulatorji z ničelnim tlakom so vključeni kot posebna vrsta tlačnega regulatorja z nadzorom razmerja med pnevmatskim plinom/zrakom), ki so namenjeni za uporabo s plinskimi gorilniki, plinskimi napravami ipd., v nadaljevanju: tlačni regulatorji.
Ta evropski standard se uporablja za:
– tlačne regulatorje z označenim najvišjim vhodnim tlakom do vključno 50 kPa (500 mbar) nazivnih velikosti priključkov do vključno DN 250 za uporabo z enim ali več gorivnih plinov v skladu s standardom EN 437;
– tlačne regulatorje, ki uporabljajo pomožno energijo;
– tlačne regulatorje z nadzorom razmerja med pnevmatskim plinom/zrakom, ki delujejo na podlagi nadzora izstopnega tlaka plina kot odziv na signal zračnega tlaka, signal diferenčnega zračnega tlaka in/ali signal tlaka peči (regulatorji z ničelnim tlakom so vključeni kot posebna vrsta tlačnega regulatorja z nadzorom razmerja med pnevmatskim plinom/zrakom);
– tlačne regulatorje z nadzorom razmerja med plinom/zrakom, ki spremenijo izstopni zračni tlak kot odziv na signal plinskega tlaka ali signal diferenčnega plinskega tlaka.
Ta evropski standard ne zajema:
– tlačnih regulatorjev, priključenih neposredno na omrežje za distribucijo plina, ali vsebnik, ki ohranja tlak pri običajni distribuciji;
– tlačnih regulatorjev, namenjenih za plinske naprave, ki jih je treba montirati na odprtem in so izpostavljene okolju;
– mehansko povezanih naprav z nadzorom razmerja med plinom/zrakom;
– elektronskih naprav z nadzorom razmerja med plinom/zrakom (EN 12067-2).

General Information

• Status: Withdrawn
• Publication Date: 13-Mar-2016
• Withdrawal Date: 14-Nov-2022
• ICS: 23.060.40 - Pressure regulators
• Technical Committee: PLN - Gas appliances for domestic use
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 07-Nov-2022
• Due Date: 30-Nov-2022
• Completion Date: 15-Nov-2022
• Directive: 2009/142/EC - DIRECTIVE 2009/142/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 30 November 2009 relating to appliances burning gaseous fuels
• Mandate: M/BC/CEN/86/6 - Standardization request to CEN concerning simple unfired pressure vessels
• Ref Project: EN 88-1:2011+A1:2016 - Pressure regulators and associated safety devices for gas appliances - Part 1: Pressure regulators for inlet pressures up to and including 50 kPa

Relations

• Replaced By: SIST EN 88-1:2022 - Safety and control devices for gas burners and gas burning appliances - Part 1: Pressure regulators for inlet pressures up to and including 50 kPa
• Effective Date: 01-Dec-2022
• Replaces: SIST EN 88-1:2011 - Pressure regulators and associated safety devices for gas appliances - Part 1: Pressure regulators for inlet pressures up to and including 50 kPa
• Effective Date: 01-Apr-2016
• Consolidates: SIST EN 88-1:2011/kFprA1:2015 - Pressure regulators and associated safety devices for gas appliances - Part 1: Pressure regulators for inlet pressures up to and including 50 kPa
• Effective Date: 01-Apr-2016
• Consolidates: SIST EN 88-1:2011 - Pressure regulators and associated safety devices for gas appliances - Part 1: Pressure regulators for inlet pressures up to and including 50 kPa
• Effective Date: 18-Jan-2023
• Consolidates: SIST EN 88-1:2011/kFprA1:2015 - Pressure regulators and associated safety devices for gas appliances - Part 1: Pressure regulators for inlet pressures up to and including 50 kPa
• Effective Date: 18-Jan-2023
• Consolidates: SIST EN 88-1:2011 - Pressure regulators and associated safety devices for gas appliances - Part 1: Pressure regulators for inlet pressures up to and including 50 kPa
• Effective Date: 19-Jan-2023
• Consolidates: SIST EN 88-1:2011/kFprA1:2015 - Pressure regulators and associated safety devices for gas appliances - Part 1: Pressure regulators for inlet pressures up to and including 50 kPa
• Effective Date: 19-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 88-1:2011+A1:2016
01-april-2016
7ODþQLUHJXODWRUMLLQSULSDGDMRþHYDUQRVWQHQDSUDYH]DSOLQVNHDSDUDWHGHO
7ODþQLUHJXODWRUML]DYVWRSQHWODNHGRYNOMXþQRPEDUN3DYNOMXþQR]
GRSROQLORP$
Pressure regulators and associated safety devices for gas appliances - Part 1: Pressure
regulators for inlet pressures up to and including 50 kPa
Druckregler und zugehörige Sicherheitseinrichtungen für Gasgeräte - Teil 1: Druckregler
für Eingangsdrücke bis einschließlich 50 kPa
Régulateurs de pression et dispositifs de sécurité associés pour appareils à gaz - Partie
1: Régulateurs de pression pour pression amont inférieure ou égale à 50 kPa
Ta slovenski standard je istoveten z: EN 88-1:2011+A1:2016
ICS:
23.060.40 7ODþQLUHJXODWRUML Pressure regulators
SIST EN 88-1:2011+A1:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 88-1:2011+A1:2016

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SIST EN 88-1:2011+A1:2016


EN 88-1:2011+A1
EUROPEAN STANDARD

NORME EUROPÉENNE

February 2016
EUROPÄISCHE NORM
ICS 23.060.40 Supersedes EN 88-1:2011
English Version

Pressure regulators and associated safety devices for gas
appliances - Part 1: Pressure regulators for inlet pressures
up to and including 50 kPa
Régulateurs de pression et dispositifs de sécurité Druckregler und zugehörige Sicherheitseinrichtungen
associés pour appareils à gaz - Partie 1: Régulateurs de für Gasgeräte - Teil 1: Druckregler für Eingangsdrücke
pression pour pression amont inférieure ou égale à 50 bis einschließlich 50 kPa
kPa
This European Standard was approved by CEN on 26 February 2011 and includes Amendment 1 approved by CEN on 1
December 2015.

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

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 88-1:2011+A1:2016 E
worldwide for CEN national Members.

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SIST EN 88-1:2011+A1:2016
EN 88-1:2011+A1:2016 (E)
Contents Page
European foreword . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Classification . 12
4.1 Classes of control . 12
4.2 Groups of control . 12
4.3 Classes of control functions . 13
5 Units of measurement and test conditions . 13
6 Construction requirements . 13
6.1 General . 13
6.2 Mechanical parts of the control . 13
6.2.1 Appearance . 13
6.2.2 Holes . 13
6.2.3 Breather holes . 13
6.2.4 Test for leakage of breather holes . 13
6.2.5 Screwed fastenings . 14
6.2.6 Jointing . 14
6.2.7 Moving parts . 14
6.2.8 Sealing caps . 14
6.2.9 Dismantling and reassembly . 14
14
6.2.101 Adjustments .
6.2.102 Resistance to pressure . 14
6.2.103 Blockage of canals and orifices . 14
6.2.104 Signal tube connections . 14
6.3 Materials . 14
6.3.1 General material requirements . 14
6.3.2 Housing . 14
6.3.3 Test for leakage of housing after removal of non-metallic parts . 15
6.3.4 Zinc alloys . 15
6.3.5 Springs providing closing and/or sealing force . 15
6.3.6 Resistance to corrosion and surface protection . 15
6.3.7 Impregnation . 15
6.3.8 Seals for glands for moving parts . 15
6.4 Gas connections . 15
6.4.1 Making connections. 15
6.4.2 Connection sizes . 15
6.4.3 Threads . 15
6.4.4 Union joints . 15
6.4.5 Flanges . 15
6.4.6 Compression fittings . 15
6.4.7 Nipples for pressure test . 16
6.4.8 Strainers . 16
6.5 Electronic parts of the control . 16
6.6 Protection against internal faults for the purpose of functional safety . 16
7 Performance . 16
2

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SIST EN 88-1:2011+A1:2016
EN 88-1:2011+A1:2016 (E)
7.1 General . 16
7.2 Leak tightness . 16
7.3 Test for leak tightness . 16
7.3.1 General . 16
7.3.2 External leak-tightness . 16
7.3.3 Internal leak-tightness . 16
7.3.101 External leak-tightness for signal carrying compartment(s) . 17
7.4 Torsion and bending . 17
7.5 Torsion and bending tests . 17
7.6 Rated flow rate . 17
7.7 Test for rated flow . 17
7.7.1 Apparatus . 17
7.7.2 Test procedure . 17
7.7.3 Conversion of air flow rate . 17
7.8 Durability. 17
7.9 Performance tests for electronic controls . 17
7.10 Long-term performance for electronic controls . 17
7.101 Pressure regulator performance . 17
7.101.1 General . 17
7.101.2 General test procedure . 18
7.101.3 Class A pressure regulator performance . 20
7.101.4 Class B pressure regulator performance . 20
7.101.5 Class C pressure regulator performance . 21
7.101.6 Endurance . 22
7.101.7 Lock-up pressure . 23
7.101.8 Requirement for rendered inoperative pressure regulators . 23
7.101.9 Test for rendered inoperative pressure regulators . 23
7.102 Pneumatic gas/air ratio pressure regulator performance . 23
7.102.1 General . 23
7.102.2 General test procedure . 24
7.102.3 Control performance and stability . 24
7.102.4 Settling time . 26
7.102.5 Gas/air ratio adjustment . 26
7.102.6 Offset adjustment . 27
7.102.7 Endurance . 27
8 EMC/Electrical requirements . 27
8.1 Protection against environmental influences . 27
8.2 Supply voltage variations below 85 % of rated voltage. 28
8.3 Short term voltage interruptions and decreases . 28
8.4 Supply frequency variations . 28
8.5 Surge immunity test . 28
8.6 Electrical fast transient/burst . 28
8.7 Immunity to conducted disturbances . 28
8.8 Immunity to radiated fields . 28
8.9 Electrostatic discharge immunity test . 28
8.10 Power frequency magnetic field immunity test . 28
8.11 Electrical requirements . 28
8.11.1 General . 28
8.11.2 Electrical equipment . 28
9 Marking, installation and operating instructions . 29
9.1 Marking . 29
9.2 Installation and operating instructions . 29
3

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SIST EN 88-1:2011+A1:2016
EN 88-1:2011+A1:2016 (E)
9.3 Warning notice . 31
Annex A (informative) Gas connections in common use in the various countries . 32
Annex B (informative) Leak-tightness test — volumetric method . 33
Annex C (informative) Leak-tightness test — pressure loss method . 34
Annex D (normative) Conversion of pressure loss into leakage rate . 35
Annex E (normative) Electrical/electronic component fault modes . 36
Annex F (normative) Additional requirements for safety accessories and pressure
accessories as defined in EC Directive 97/23/EC . 37
Annex G (normative) Materials for pressurized parts. 38
Annex H (informative) Additional materials for pressurized parts . 39
Annex I (normative) Requirements for controls used in DC supplied gas burners and gas
burning appliances . 40
Annex AA (informative) Typical pressure regulators and pressure regulator parts . 41
Annex BB (informative) Overview of requirements and test conditions (as given in Clause 7),
and examples of performance curves for pressure regulators . 42
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EC Directive 2009/142/EC relating to appliances burning gaseous fuels . 48
Bibliography . 50
Figures
Figure 1 — Step response of a transfer element. 11
Figure 2 — Performance test apparatus . 19
Figure 3 — Gas/air modulation curves . 26
!Figure 4" — Delta p versus rated flow rate curve. 31
Figure AA.1 — Types of constant pressure regulators . 41
Figure BB.1 — Example for class A pressure regulator including maximum outlet pressure variations
for constant outlet setting pressure p2s and lock-up pressure p2f including typical results . 43
Figure BB.2 — Example for class A pressure regulator including maximum outlet pressure variations
for adjustable outlet setting pressures p , p , and lock-up pressures p , p , including
2smin 2smax 2fmin 2fmax
typical results. 44
Figure BB.3 — Example for class A pressure regulator including maximum outlet pressure variation for
constant outlet setting pressure p including typical results . 45
2s
Figure BB.4 — Example for class B pressure regulator including maximum outlet pressure variation for
constant outlet setting pressure p including typical results . 45
2s
Figure BB.5 — Example for class C pressure regulator including maximum outlet pressure variation for
constant outlet setting pressure p including typical results . 46
2s
Tables
Table 1 — Gas pressure at inlet to the pressure regulator. 18
4

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SIST EN 88-1:2011+A1:2016
EN 88-1:2011+A1:2016 (E)
Table 2 — Outlet pressure variation from the outlet setting pressure p . 18
2s
Table 3 — Control performance test procedure . 25
Table BB.1 — Overview of pressure regulator requirements . 42
Table BB.2 — Test procedure . 47
Table ZA.1 — Correspondence between this European Standard and Directive 2009/142/EC relating to
appliances burning gaseous fuels . 48

5

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SIST EN 88-1:2011+A1:2016
EN 88-1:2011+A1:2016 (E)
European foreword
This document (EN 88-1:2011+A1:2016) 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 August 2016, and conflicting national standards shall
be withdrawn at the latest by August 2016.
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 includes Amendment 1 approved by CEN on 2015-12-01.
This document supersedes !EN 88-1:2011."
The start and finish of text introduced or altered by amendment is indicated in the text by tags !".
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 document is intended to be used in conjunction with EN 13611:2007. This document refers to
clauses of EN 13611:2007 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 which are
particular to this European Standard. It should be noted that these clauses and sub-clauses are not
indicated as an addition. Sub-clauses or annexes which are additional to those in EN 13611:2007 are
numbered starting from 101 or are designated as Annex AA, BB, CC etc.
!deleted text"
EN 88 Pressure regulators and associated safety devices for gas appliances consists of the following parts:
— EN 88-1, Pressure regulators and associated safety devices for gas appliances — Part 1: Pressure
regulators for inlet pressures up to and including 50 kPa;
— EN 88-2, Pressure regulators and associated safety devices for gas appliances — Part 2: Pressure
regulators for inlet pressures above 500 mbar up to and including 5 bar.
Performance Level (PL) or Safety Integrity Level (SIL) classifications according to EN ISO 13849-1 or
EN 61508-1 cannot automatically be claimed based upon compliance with this European Standard.
Pressure regulators with PL or SIL classification do not automatically meet the requirements of this
European 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,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
6

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SIST EN 88-1:2011+A1:2016
EN 88-1:2011+A1:2016 (E)
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.
7

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SIST EN 88-1:2011+A1:2016
EN 88-1:2011+A1:2016 (E)
1 Scope
This European Standard specifies the safety, construction and performance requirements for pressure
regulators and pneumatic gas/air ratio pressure regulators (zero pressure regulators are included as a
special type of pneumatic gas/air ratio pressure regulator), intended for use with gas burners, gas
appliances and similar use, hereafter referred to as ‘pressure regulators’.
This European Standard is applicable to
— pressure regulators with declared maximum inlet pressures up to and including 50 kPa (500 mbar)
of nominal connection sizes up to and including DN 250 for use with one or more fuel gases in
accordance with EN 437,
— pressure regulators which use auxiliary energy,
— pneumatic gas/air ratio pressure regulators, which function by controlling a gas outlet pressure in
response to an air signal pressure, air signal differential pressure, and/or to a furnace pressure
signal (zero pressure regulators are included as a special type of pneumatic gas/air ratio pressure
regulator),
— gas/air ratio pressure regulators which change an air outlet pressure in response to a gas signal
pressure or a gas signal differential pressure.
This European Standard does not cover
— pressure regulators connected directly to gas distribution network or to a container that maintains
a standard distribution pressure,
— pressure regulators intended for gas appliances to be installed in the open air and exposed to the
environment,
— mechanically linked gas/air ratio controls,
— electronic gas/air ratio controls (EN 12067-2).
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.
1
EN 161:2011 , Automatic shut-off valves for gas burners and ga
...