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

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing 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 regulators) for burners and appliances burning one or more gaseous fuels, hereafter referred to as “pressure regulators”.
This document is applicable to pressure regulators with declared maximum inlet pressures up to and including 50 kPa and of nominal connection sizes up to and including DN 250.
Addition:
This document is applicable to:
-   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 regulators);
-   pneumatic 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 document is not applicable to:
-   pressure regulators connected directly to a 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 2:2022).
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

Sicherheits- und Regeleinrichtungen für Gasbrenner und Gasgeräte - Teil 1: Druckregler für Eingangsdrücke bis einschließlich 50 kPa

Nach EN 13611:2019, Abschnitt 1 mit der folgenden Änderung und der folgenden Ergänzung:
Änderung:
Der 1. Absatz von EN 13611:2019, Abschnitt 1, wird durch Folgendes ersetzt:
Dieses Dokument legt die Sicherheits-, Auslegungs-, Konstruktions- und Leistungs¬anforderungen sowie die Prüfung von Druckreglern und pneumatischen Gas-Luft-Verbundreglern fest (Nulldruckregler sind als besonderer Typ von pneumatischen Gas-Luft-Verbundreglern eingeschlossen) für Brenner und Brennstoffgeräte für einen oder mehrere gasförmige(n) Brennstoff(e) oder flüssige Brennstoffe fest, die nachstehend als "Druckregler" bezeichnet werden.
Dieses Dokument gilt für Druckregler mit angegebenen höchsten Eingangsdrücken bis einschließlich 50 kPa und mit Anschlussnennweiten bis einschließlich DN 250.
Ergänzung:
Dieses Dokument ist anwendbar auf:
-   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 Luftsignaldruck, einem Luftsignal-Differenzdruck und/oder einem Feuerraumdrucksignal regeln;
-   pneumatische Gas-Luft-Verbundregler, die eine Änderung des Luftausgangsdrucks in Abhängigkeit von einem Gassignaldruck oder einem Gassignal-Differenzdruck regeln.
Dieses Dokument ist nicht anwendbar auf:
-   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:-).

Dispositifs de sécurité et de contrôle pour les brûleurs à gaz et appareils utilisant des combustibles gazeux - Partie 1 : Régulateurs de pression pour pression amont inférieure ou égale à 50 kPa

L’article 1 de la norme EN 13611:2019 s’applique avec la modification et l’addition suivantes :
Modification :
Le 1er paragraphe de l’article 1 de la norme EN 13611:2019 est remplacé par ce qui suit :
Le présent document spécifie les exigences en termes de sécurité, de construction, de fonctionnement et les essais 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 ».
Ce document est applicable aux régulateurs de pression supportant des pressions amont maximales déclarées inférieures ou égales à 50 kPa, ayant un diamètre nominal de raccordement jusqu'à DN 250 inclus.
Addition :
Le présent document est applicable :
-   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.
Le présent document 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).
Le 4ième paragraphe de l’article 1 de la EN 13611 :2019 est supprimé.

Varnostne in nadzorne naprave za plinske gorilnike in plinske aparate - 1. del: Regulatorji tlaka za vstopne tlake do vključno 50 kPa

General Information

• Status: Withdrawn
• Publication Date: 11-Oct-2022
• Withdrawal Date: 13-Apr-2025
• ICS: 23.060.40 - Pressure regulators
• Technical Committee: CEN/TC 58 - Safety and control devices for burners and appliances burning gaseous or liquid fuels
• Drafting Committee: CEN/TC 58/WG 13 - Mechanics
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 13-Dec-2023
• Completion Date: 14-Apr-2025
• Directive: 2014/68/EU - Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment
• Directive: 2016/426 - REGULATION (EU) 2016/426 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 9 March 2016 on appliances burning gaseous fuels and repealing Directive 2009/142/EC
• Mandate: M/BC/CEN/86/6 - Standardization request to CEN concerning simple unfired pressure vessels
• Mandate: M/BC/CEN/89/6 - Standardization request to CEN concerning appliances burning gaseous fuels
• Ref Project: 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

Relations

• Replaces: 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
• Effective Date: 19-Oct-2022
• Merged Into: EN 88-1:2022+A1:2023 - 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: 18-Oct-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2022
Nadomešča:
SIST EN 88-1:2011+A1:2016
Varnostne in nadzorne naprave za plinske gorilnike in plinske aparate - 1. del:
Regulatorji tlaka za vstopne tlake do vključno 50 kPa
Safety and control devices for gas burners and gas burning appliances - Part 1: Pressure
regulators for inlet pressures up to and including 50 kPa
Sicherheits- und Regeleinrichtungen für Gasbrenner und Gasgeräte - Teil 1: Druckregler
für Eingangsdrücke bis einschließlich 50 kPa
Dispositifs de sécurité et de contrôle pour les brûleurs à gaz et appareils utilisant des
combustibles gazeux - Partie 1 : Régulateurs de pression pour pression amont inférieure
ou égale à 50 kPa
Ta slovenski standard je istoveten z: EN 88-1:2022
ICS:
23.060.40 Tlačni regulatorji Pressure regulators
27.060.20 Plinski gorilniki Gas fuel burners
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 88-1
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2022
EUROPÄISCHE NORM
ICS 23.060.40 Supersedes EN 88-1:2011+A1:2016
English Version
Safety and control devices for gas burners and gas burning
appliances - Part 1: Pressure regulators for inlet pressures
up to and including 50 kPa
Dispositifs de sécurité et de contrôle pour les brûleurs Sicherheits- und Regeleinrichtungen für Gasbrenner
à gaz et appareils utilisant des combustibles gazeux - und Gasgeräte - Teil 1: Druckregler für Eingangsdrücke
Partie 1 : Régulateurs de pression pour pression amont bis einschließlich 50 kPa
inférieure ou égale à 50 kPa
This European Standard was approved by CEN on 8 August 2022.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 88-1:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 6
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 Classification . 13
4.1 Classes of control . 13
4.2 Groups of control . 13
4.3 Classes of control functions . 14
4.4 Types of DC supplied controls . 14
5 Test conditions and uncertainty of measurements . 14
6 Design and construction . 14
6.1 General . 14
6.2 Mechanical parts of the control . 14
6.3 Materials . 16
6.4 Gas connections . 16
6.5 Electrical parts of the control . 16
6.6 Protection against internal faults for the purpose of functional safety . 16
7 Performance . 17
7.1 General . 17
7.2 Leak-tightness . 17
7.3 Torsion and bending . 17
7.4 Rated flow rate . 17
7.5 Durability . 18
7.6 Performance tests for electronic controls . 18
7.7 Long-term performance for electronic controls . 18
7.8 Data exchange . 18
7.101 Pressure regulator performance . 18
7.102 Pneumatic gas/air ratio pressure regulator performance . 25
8 Electrical requirements . 29
8.1 General . 29
8.2 Protection by enclosure . 29
8.101 Plug connections . 29
9 Electromagnetic compatibility (EMC) . 29
9.1 Protection against environmental influences . 29
9.2 Supply voltage variations below 85 % of rated voltage . 29
9.3 Voltage dips and interruptions . 29
9.4 Supply frequency variations . 29
9.5 Surge immunity tests . 30
9.6 Electrical fast transient/burst . 30
9.7 Immunity to conducted disturbances induced by radio frequency fields . 30
9.8 Immunity to radiated disturbances induced by radio frequency fields . 30
9.9 Electrostatic discharge tests . 30
9.10 Power frequency magnetic field immunity tests . 30
9.11 Harmonics and interharmonics including mains signalling at a. c. power port, low
frequency immunity tests . 30
10 Marking, instructions . 30
10.1 Marking . 30
10.2 Instructions . 31
10.3 Warning notice . 32
Annex A (informative) Abbreviations and Symbols . 33
Annex B (informative) Leak-tightness test for gas controls – volumetric method . 34
Annex C (informative) Leak-tightness test for gas controls – pressure loss method . 35
Annex D (normative) Calculation of pressure loss into leakage rate . 36
Annex E (normative) Electrical/electronic component fault modes . 37
Annex F (normative) Additional requirements for safety accessories and pressure
accessories as defined in EU Directive 2014/68/EU . 38
Annex G (normative) Materials for pressurized parts . 39
Annex H (normative) Additional materials for pressurized parts . 40
Annex I (normative) Requirements for controls used in DC supplied burners and
appliances burning gaseous or liquid fuels . 41
Annex J (normative) Method for the determination of a Safety Integrity Level (SIL) . 42
Annex K (normative) Method for the determination of a Peformance Level (PL) . 43
Annex L (informative) Relationship between Safety Integrity Level (SIL) and Peformance
Level (PL) . 44
Annex M (normative) Reset functions . 45
Annex N (informative) Guidance document on Environmental Aspects . 46
Annex O (normative) Seals of elastomer, cork and synthetic fibre mixtures . 47
Annex AA (informative) Typical pressure regulators and pressure regulator parts . 48
Annex BB (informative) Overview of requirements and test conditions (as given in 7.101),
and examples of performance curves for pressure regulators . 49
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Regulation (EU) 2016/426 aimed to be covered . 56
Bibliography . 59

European foreword
This document (EN 88-1:2022) 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 April 2023, and conflicting national standards shall be
withdrawn at the latest by October 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 88-1:2011+A1:2016.
The following significant changes compared to the previous edition have been incorporated in this
document:
a) title changed to be aligned with the title of CEN/TC 58;
b) alignment with EN 13611:2019;
c) requirements from EU Directive 2014/68/EU were not adopted;
d) terms and definitions are aligned with EN 13611:2019;
e) reference to EN 437 in the scope removed;
f) EN 88-1, EN 88-2 and EN 88-3 aligned;
g) 6.5.1 “Electronic parts of the control – General” is applicable;
h) 7.2.101 and 7.2.102 “External leak-tightness for signal carrying compartment” separation between
air and gas signal;
i) information on life time for safe function (designed lifetime) added to instructions.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part
of this document.
The EN 88 series consists of the following parts:
— EN 88-1, Safety and control devices for gas burners and gas burning appliances — Part 1: Pressure
regulators for inlet pressures up to and including 50 kPa;
— EN 88-2, Safety and control devices for gas burners and gas burning appliances — Part 2: Pressure
regulators for inlet pressures above 50 kPa up to and including 500 kPa;
— EN 88-3, Safety and control devices for gas burners and gas burning appliances — Part 3: Pressure
and/or flow rate regulators for inlet pressures up to and including 500 kPa, electronic types.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
Introduction
This document is intended to be used in conjunction with EN 13611:2019.
EN 13611:2019 recognizes the safety level specified by CEN/TC 58 and is regarded as a horizontal
standard dealing with the safety, construction, performance and testing of controls for burners and
appliances burning gaseous and/or liquid fuels.
The general requirements for controls are given in EN 13611:2019, and methods for classification and
assessment for new controls and control functions are given in EN 14459:2021 (see Figure 1).
EN 126:2012 (see Figure 1) specifies multifunctional controls combining two or more controls and
Application Control Functions, one of which is a mechanical control function. The requirements for
controls and Application Control Functions are given in the specific control standard (see Figure 1,
control functions).
Figure 1 — Interrelation of control standards
EN 13611:2019 should be used in conjunction with the specific standard for a specific type of control (e.g.
EN 298:2022, EN 1106:2022, EN 1643:2022, EN 1854:— , EN 12067-2:2022, EN 16304:2022,
EN 16340:2014, EN 16678:2022 and EN 16898:2022), or for controls for specific applications.
EN 13611:2019 can also be applied, so far as reasonable, to controls not mentioned in a specific standard
and to controls designed on new principles, in which case additional requirements can be necessary.
EN 14459:2021 provides methods for classification and assessment of new control principles.
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
time 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.

Under preparation. Stage at the time of publication: FprEN 1854:2022.
Measures to prevent from dangerous situations are defined. Field experience over many decades is
reflected in the CEN/TC 58 standards. Requirements of EN 13611:2019 can be considered as proven in
practice.
This document refers to clauses of EN 13611:2019 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 document adds clauses or subclauses to the structure of EN 13611:2019 which are particular to this
document. Subclauses which are additional to those in EN 13611:2019 are numbered starting from 101.
Additional Annexes are designated as Annex AA and Annex BB. It should be noted that these clauses,
subclauses and Annexes are not indicated as an addition.
If by reference to EN 13611:2019 the term “control” is given, this term should be read as “pressure
regulator”.
1 Scope
EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
st
The 1 paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing 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 regulators) for burners and appliances
burning one or more gaseous fuels, hereafter referred to as “pressure regulators”.
This document is applicable to pressure regulators with declared maximum inlet pressures up to and
including 50 kPa and of nominal connection sizes up to and including DN 250.
Addition:
This document is applicable to:
— 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
regulators);
— pneumatic 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 document is not applicable to:
— pressure regulators connected directly to a 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 12067-2:2022).
th
The 4 paragraph of EN 13611:2019, Clause 1 is removed.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 161:2022, Automatic shut-off valves for gas burners and gas appliances
EN 437:2021, Test gases — Test pressures — Appliance categories
EN 13611:2019 , Safety and control devices for burners and appliances burning gaseous and/or liquid fuels
— General requirements
EN 175301-803:2006, 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 13611:2019 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.101
pressure regulator
device which maintains the outlet pressure constant independent of the variations in inlet pressure
and/or flow rate within defined limits
Note 1 to entry: Examples of typical pressure regulators are given in Annex AA.
3.102
direct regulator
pressure regulator where the spring or pressure signal acts directly on the working diaphragm
3.103
indirect regulator
pressure regulator where the spring or pressure signal acts directly on a regulator diaphragm that
controls the working diaphragm or the control member with pneumatic, hydraulic or electric means
3.104
adjustable pressure regulator
pressure regulator provided with means for changing the outlet pressure setting
3.105
pneumatic gas/air ratio pressure regulator
pressure regulator, which supplies gas at specified pressure at its outlet in response to control pressure

As impacted by EN 13611:2019/AC:2021.
3.106
zero pressure regulator
pressure regulator, which maintains the outlet pressure constant at atmospheric pressure
3.107
control member
movable part of the pressure regulator which varies flow rate and/or outlet pressure directly
3.108
inlet pressure range
difference between the maximum and minimum values of the inlet pressure, as stated in the instructions
3.109
maximum inlet pressure
p
1max
highest inlet pressure, as stated in the instructions, at which the pressure regulator can be operated
3.110
minimum inlet pressure
p
1min
lowest inlet pressure, as stated in the instructions, at which the pressure regulator can be operated
3.111
maximum outlet pressure
p
2max
upper limit of the outlet pressure, as stated in the instructions, at which the pressure regulator can be
operated
3.112
minimum outlet pressure
p
2min
lower limit of the outlet pressure, as stated in the instructions, at which the pressure regulator can be
operated
3.113
outlet pressure range
difference between the maximum and minimum values of the outlet pressure, as stated in the instructions
3.114
inlet setting pressure
p
1s
inlet pressure at which the pressure regulator is set for test purposes
3.115
outlet setting pressure
p
2s
outlet pressure at which the pressure regulator is set for test purposes
3.116
maximum rated flow rate
q
max
upper limit of the rated air flow rate, corrected to standard conditions, as stated in the instructions
3.117
minimum rated flow rate
q
min
lower limit of the rated air flow rate, corrected to standard conditions, as stated in the instructions
3.118
signal pressure
p
pressure, differential pressure or a combination of both applied to the regulator in order to provide the
specified outlet pressure
3.119
signal pressure range
range of signal pressure between the maximum and minimum values, as stated in the instructions
3.120
load determining pressure
p
underpressure as a result of an air flow, e.g. produced by a sucking fan, through a restriction
3.121
gas/air ratio
slope of a straight line relationship between the outlet pressure p and signal pressure p
2 3
3.122
working diaphragm
flexible member which, under the influence of the forces arising from loading and pressure, operates the
control member
3.123
diaphragm plate
stiffening plate fitted to the diaphragm
3.124
lock-up pressure
p
2f
outlet pressure at which a pressure regulator closes when the outlet of the pressure regulator is sealed
3.125
put out of action
block the operation of the pressure regulator by fixing the control member in the fully open position
3.126
furnace pressure
pressure of combustion gases from the combustion chamber connected to the pressure regulator
3.127
signal chamber
part of the pressure regulator to which the air signal pressure, gas pressure, or furnace pressure signal is
connected
3.128
signal connection
connection that is used to convey pressure from part of an installation to the signal chamber
3.129
offset
outlet pressure shift at pneumatic gas/air ratio pressure regulators independent of signal or load
determining pressure(s)
Note 1 to entry: Typically, this is achieved by means of a spring.
3.130
step response
outlet pressure change of a pneumatic gas/air ratio pressure regulator having a step change of the signal
pressure or load determining pressure
Note 1 to entry: For further information refer to Figure 2.

Key
1 step function (y1) 5 steady-state value
2 step response (y2) 6 response time
3 overshoot value 7 settling time
4 settling tolerance t time
Figure 2 — Step response of a transfer element
3.131
steady state value
outlet pressure measured after step response remains constant
Note 1 to entry: For further information refer to Figure 2.
3.132
settling tolerance
maximum difference between the current outlet pressure and its steady state value
Note 1 to entry: For further information refer to Figure 2.
3.133
response time
time counted from start of the step change of the signal pressure or load determining pressure until the
outlet pressure is in the settling tolerance for the first time
Note 1 to entry: For further information refer to Figure 2.
3.134
settling time
time counted from start of the step change of the signal pressure or load determining pressure until the
outlet pressure remains within the settling tolerance
Note 1 to entry: For further information refer to Figure 2.
3.135
overshoot value
largest difference between the outlet pressure and its steady state value after step change of the signal
pressure or load determining pressure exceeding the settling tolerance for the first time
Note 1 to entry: For further information refer to Figure 2.
3.136
withstand pressure
pressure that is withstood without degraded characteristic after returning below the maximum inlet
pressure
Note 1 to entry: The withstand pressure is equal to or higher than the maximum inlet pressure.
[SOURCE: EN 1854:— , 3.115, modified – “at a PSD” removed from the definition and Note 1 to entry
changed]
3.137
safety shut-off device
SSD
device having the function of staying in the open position under normal operating conditions and to shut
off the gas flow automatically and completely when the monitored pressure deviates above or below the
pre-set value
[SOURCE: EN 88-2:2022, 3.103]
4 Classification
4.1 Classes of control
EN 13611:2019, 4.1 is replaced by the following:
Pressure regulators shall be classified A, B, or C according to the appropriate outlet pressure and rated
flow rate limits given in 7.101.1, Table 2.
Pneumatic gas/air ratio pressure regulators are not classified.
4.2 Groups of control
Shall be according to EN 13611:2019, 4.2.
4.3 Classes of control functions
EN 13611:2019, 4.3 is not applicable.
4.4 Types of DC supplied controls
Shall be according to EN 13611:2019, 4.4.
5 Test conditions and uncertainty of measurements
Shall be according to EN 13611:2019, Clause 5.
6 Design and construction
6.1 General
Shall be according to EN 13611:2019, 6.1 with the following modification:
rd
The 3 paragraph of EN 13611:2019, 6.1 is not applicable.
6.2 Mechanical parts of the control
6.2.1 Appearance
Shall be according to EN 13611:2019, 6.2.1.
6.2.2 Holes
Shall be according to EN 13611:2019, 6.2.2.
6.2.3 Breather holes
6.2.3.1 Requirements
Shall be according to EN 13611:2019, 6.2.3.1 with the following modification and addition:
Use the withstand pressure instead of the maximum inlet pressure, if applicable.
Alternatively, for indirect regulators the requirement of a maximum leakage rate of 70 dm /h for
breather holes may be replaced by the following requirement:
— the breather hole has a maximum diameter of 1 mm;
— a ruptured regulator diaphragm shall lead to a situation where the control member moves to the
closed or the fully open position;
— the stress temperature for the diaphragm shall be according to 6.2.3.2;
— after the tests of 6.2.3.2 the leakage rate shall fulfil the requirements of 7.2.
6.2.3.2 Test for leakage of breather holes
Shall be according to EN 13611:2019, 6.2.3.2 with the following addition:
If for indirect regulators the alternative requirement of 6.2.3.1 is used, the following test applies:
— leave the pressure regulator diaphragm as is;
— store one pressure regulator for 1 h ± 5 min at 135 °C ± 2 °C ambient temperature;
— keep the pressure regulator at this temperature and apply a pressure of three times the withstand
pressure to gas-carrying compartments for 5 min ± 10 s;
— wait for the pressure regulator to return to room temperature;
— measure the external leakage rate according to 7.2.2.
6.2.4 Screwed fastenings
Shall be according to EN 13611:2019, 6.2.4.
6.2.5 Jointing
Shall be according to EN 13611:2019, 6.2.5.
6.2.6 Moving parts
Shall be according to EN 13611:2019, 6.2.6.
6.2.7 Sealing caps
Shall be according to EN 13611:2019, 6.2.7.
6.2.8 Dismantling and reassembly
Shall be according to EN 13611:2019, 6.2.8.
6.2.9 Auxiliary canals and orifices
Shall be according to EN 13611:2019, 6.2.9.
6.2.10 Presetting device
Shall be according to EN 13611:2019, 6.2.10.
6.2.101 Adjustments
The adjustments (e.g. outlet pressure, offset and gas/air ratio) shall be readily accessible to authorized
personal, but there shall be provision for sealing after adjustment. Means shall be provided to discourage
interference by unauthorised personal. If it is stated in the instructions that a pressure regulator can be
put out of action, appropriate means shall be provided to put the pressure regulator out of action and the
information how to do this shall be given in the instructions.
6.2.102 Resistance to pressure
Parts of the pressure regulator that are subjected to inlet pressure under normal operating conditions,
or could be subjected to inlet pressure in the event of a failure, shall resist a pressure equal to the
withstand pressure.
6.2.103 Signal tube connections
Requirements on connections for gas pressure, air pressure or furnace pressure signal tubes shall be
stated in the instructions.
6.3 Materials
6.3.1 General material requirements
Shall be according to EN 13611:2019, 6.3.1.
6.3.2 Housing
6.3.2.1 Requirements
Shall be according to EN 13611:2019, 6.3.2.1 with the following modification:
The withstand pressure shall be used instead of maximum inlet pressure, if applicable.
6.3.2.2 Test
Shall be according to EN 13611:2019, 6.3.2.2 with the following modification:
The test shall be performed in accordance with 7.2.2.
6.3.3 Zinc alloys
Shall be according to EN 13611:2019, 6.3.3.
6.3.4 Springs
EN 13611:2019, 6.3.4 is not applicable.
6.3.5 Resistance to corrosion and surface protection
Shall be according to EN 13611:2019, 6.3.5.
6.3.6 Impregnation
Shall be according to EN 13611:2019, 6.3.6.
6.3.7 Seals for glands for moving parts
Shall be according to EN 13611:2019, 6.3.7.
6.4 Gas connections
Shall be according to EN 13611:2019, 6.4.
6.5 Electrical parts of the control
6.5.1 General
Shall be according to EN 13611:2019, 6.5.1.
6.5.2 Switching elements
EN 13611:2019, 6.5.2 is not applicable.
6.5.3 Electrical components
EN 13611:2019, 6.5.3 is not applicable.
6.6 Protection against internal faults for the purpose of functional safety
EN 13611:2019, 6.6 is not applicable.
7 Performance
7.1 General
Shall be according to EN 13611:2019, 7.1.
7.2 Leak-tightness
7.2.1 Requirements
Shall be according to EN 13611:2019, 7.2.1.
7.2.2 Tests
7.2.2.1 General
Shall be according to EN 13611:2019, 7.2.2.1.
7.2.2.2 External leak-tightness
Shall be according to EN 13611:2019, 7.2.2.2 with the following addition:
If stated in the instructions that the pressure regulator shall be used in combination with a safety shut-
off device upstream of the pressure regulator the following alternative external leakage test may be used:
For external leakage conduct the test with 1,5 times the withstand pressure at inlet and outlet, and with
a pressure of 1,5 times the difference between withstand pressure and maximum outlet pressure on the
atmospheric side of the working diaphragm (including the safety diaphragm, if any).
7.2.2.3 Internal leak-tightness
EN 13611:2019, 7.2.2.3 is not applicable.
7.2.101 External leak-tightness for gas signal carrying compartment(s)
With any bleed port incorporated in the signal tube(s) or signal chamber(s) plugged, pressurize and test
the compartment(s) according to 7.2 and measure the leakage rate.
The test results shall meet the requirements of 7.2.1.
7.2.102 External leak-tightness for air signal carrying compartment(s)
The leakage rate from the signal chamber(s) shall not exceed the leakage rate at the maximum signal
pressure stated in the instructions before and after the tests specified in 7.102.7.
7.3 Torsion and bending
Shall be according to EN 13611:2019, 7.3.
7.4 Rated flow rate
7.4.1 Requirements
Shall be according to EN 13611:2019, 7.4.1.
7.4.2 Test
Shall be according to EN 13611:2019, 7.4.2 with the following addition:
If rated flow rate for pressure regulators as stated in the instructions is specified for the control member
in the fully open position, the test shall be performed with the control member in that position.
7.4.3 Conversion of air flow rate
Shall be according to EN 13611:2019, 7.4.3.
7.5 Durability
Shall be according to EN 13611:2019, 7.5.
7.6 Performance tests for electronic controls
EN 13611:2019, 7.6 is not applicable.
7.7 Long-term performance for electronic controls
EN 13611:2019, 7.7 is not applicable.
7.8 Data exchange
EN 13611:2019, 7.8 is not applicable.
7.101 Pressure regulator performance
7.101.1 General
When conducting performance tests at any particular setting, the minimum inlet pressure used shall be
at least 200 Pa in excess of the set outlet pressure.
If the inlet pressure range includes two corresponding values for the minimum and maximum pressure,
as given in Table 1, then the inlet setting pressure p shall be the respective nominal pressure according
1s
to that table. Otherwise, the inlet setting pressure and the inlet pressure range shall be stated in the
instructions.
The outlet pressure variation from the outlet setting pressure p shall not exceed the values given in
2s
Table 2 or ±100 Pa, whichever is the greater.
Table 1 — Gas pressure at inlet to the pressure regulator
Type of gas
Nominal pressure Minimum pressure Maximum pressure
kPa kPa kPa
according to EN 437:2021
1st family gases 0,8 0,6 1,5
2nd family gases group 2H 2,0 1,7 2,5
2nd family gases group 2L 2,5 2,0 3,0
2nd family gases group 2E 2,0 1,7 2,5
3rd family gases 2,9 2,0 3,5
2,9 2,5 3,5
3,7 2,5 4,5
5,0 4,25 5,75
6,7 5,0 8,0
11,2 6,0 14,0
14,8 10,0 18,0
Table 2 — Outlet pressure variation from the outlet setting pressure p
2s
Maximum outlet pressure variation
%
Class of pressure regulator
1st family 2nd family 3rd family
according to EN 437:2021
Class A
q to q and p to p
±15 ±15 ±15
max min 1max 1min
Class B
+15 +10
By variation of the inlet pressure for each of
the rated flow rates
−20 −15 ±10
By variation of rated flow rates from q to
max
q (constant inlet pressure) for each of the +40 +40 +40
min
inlet pressures
Class C
At constant q (within the rated flow rate
+15 +10 ±10
range)
−20 −15
7.101.2 General test procedure
7.101.2.1 Apparatus
Conduct the tests using the apparatus shown in Figure 3. The uncertainty of measurement shall not
exceed 2 %.
Dimensions in millimetres
Key
1 inlet pressure gauge p Nominal size Internal diameter d
DN mm
2 outlet pressure gauge p
6 6
3 signal pressure gauge p (see NOTE)
8 9
4 load determining pressure gauge p (see NOTE)
10 13
5, 6 differential pressure gauges (see NOTE)
15 16
7 adjustable pressure regulator for inlet pressure
20 22
8 temperature gauge
25 28
9 flow meter
32 35
10 pressure regulator under test
40 41
11 signal pressure inlet (optional) (see NOTE)
50 52
12 manual control tap (injector orifice)
65 67
13 fan (optional) (see NOTE)
80 80
100 106
NOTE Key numbers 3, 4, 5, 6, 11 and 13 are only applicable for
125 131
pneumatic gas/air ratio pressure regulators (refer to 3.105)
150 159
a
4 holes ∅ 1,5 mm
200 209
250 260
Figure 3 — Performance test apparatus
7.101.2.2 Conversion of the air flow rate
Shall be according to EN 13611:2019, 7.4.3.
7.101.2.3 Methods of test
Class A, class B and class C pressure regulators shall be tested according to 7.101.3.2, 7.101.4.2, and
7.101.5.2, respectively (see also Annex BB).
Steady-state conditions shall always be reached before readings are taken.
Examples of performance curves are shown in Annex BB, Figures BB.1 to BB.5.
7.101.3 Class A pressure regulator performance
7.101.3.1 Requirement
Over the full range of inlet pressure from p to p at any rated flow rate q within the rated flow
1min 1max
rate range q to q , as stated in the instructions, the outlet pressure variation from the outlet setting
min max
pressure p shall not exceed the values given in Table 2 or ±100 Pa, whichever is the greater. The stated
2s
minimum rated flow rate q shall be less than 10 % of q .
min max
7.101.3.2 Test
Class A pressure regulators shall be tested by measuring the outlet pressure p with variation of the inlet
pressure p and of the flow rate q, as follows:
a) In order to adjust the outlet setting pressure p of the pressure regulator, set the manual control tap
2s
to obtain a rated flow rate of 50 % of q (or any other value as stated in the instructions). For
max
adjustable pressure regulators, adjust the outlet setting pressure p to the maximum outlet pressure
2s
p , the inlet pressure p being the nominal pressure (or respectively any other value as stated in
2max 1
the instructions).
Once the outlet setting pressure p has been set, there shall be no further adjustment of the pressure
2s
regulator.
b) With minimum inlet pressure p kept constant, vary the rated flow rate q from q to q and
1min max min
back to q by using the manual control tap and record the outlet pressure p for at least 5 values
max 2
of q in each case. Ensure that there is no change of the inlet pressure p during the whole time of this
procedure.
c) Readjust the inlet pressure p from p to p and then vary the rated flow rate q from q to
1 1min 1max max
q and back to q (as in step b).
min max
d) For adjustable pressure regulators readjust the outlet setting pressure p to p according to step
2s 2min
a) and repeat steps b) and c).
7.101.4 Class B pressure regulator performance
7.101.4.1 Requirement
Over the full range of inlet pressure from p to p at any rated flow rate q within the rated flow
1min 1max
rate range q to q , as stated in the instructions, the outlet pressure variation from the outlet setting
min max
pressure p shall not exceed the values given in Table 2 or ±100 Pa, whichever is the greater.
2s
For any change of rated flow rate q within the rated flow rate q from q to q , as stated in the
min max
instructions, at any inlet pressure p within the full inlet pressure range from p to p the outlet
1 1min 1max
pressure variation from the outlet setting pressure p shall not exceed the values given in Table 2
2s
or ±100 Pa, whichever is the greater.
7.101.4.2 Test
Class B pressure regulators shall be tested by measuring the outlet pressure p with variation of the inlet
pressure p and of the rated flow rate q, as follows:
a) In order to adjust the outlet setting pressure p of the pressure regulator, set the rated flow rate q
2s
to q by adjusting the manual control tap. For adjustable pressure regulators, adjust the outlet
max
setting pressure p to the maximum outlet pressure p , the inlet pressure p being the nominal
2s 2max 1
pressure (respectively any value as stated in the instructions).
Once the outlet setting pressure p has been set, there shall be no further adjustment of the pressure
2s
regulator.
b) Vary the inlet pressure p from the nominal pressure over the minimum inlet pre
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