kSIST FprEN 88-1:2022

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

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:-).

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

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.

Regulatorji tlaka in pripadajoče varnostne naprave za plinske aparate - 1. del: Regulatorji tlaka za vstopne tlake do vključno 50 kPa

General Information

• Status: Not Published
• Public Enquiry End Date: 02-Jun-2020
• ICS: 23.060.40 - Pressure regulators
• ICS: 27.060.20 - Gas fuel burners
• Technical Committee: PLN - Gas appliances for domestic use
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 26-Oct-2022
• Due Date: 31-Dec-2022
• 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
• Ref Project: 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

• Revised: 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
• Effective Date: 01-May-2020
• Replaces: 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
• Effective Date: 19-Oct-2022

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 88-1:2020
01-maj-2020
Regulatorji tlaka in pripadajoče varnostne naprave za plinske aparate - 1. del:
Regulatorji tlaka za vstopne tlake do vključno 50 kPa

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: prEN 88-1
ICS:
23.060.40 Tlačni regulatorji Pressure regulators
27.060.20 Plinski gorilniki Gas fuel burners
oSIST prEN 88-1:2020 en,fr,de

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

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oSIST prEN 88-1:2020
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oSIST prEN 88-1:2020
DRAFT
EUROPEAN STANDARD
prEN 88-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2020
ICS 23.060.40 Will supersede EN 88-1:2011+A1:2016
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 draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 58.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 88-1:2020 E

worldwide for CEN national Members.
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oSIST prEN 88-1:2020
prEN 88-1:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 5

Introduction .................................................................................................................................................................... 6

1 Scope ................................................................................................................................................................. 7

2 Normative references ................................................................................................................................. 7

3 Terms and definitions ................................................................................................................................. 8

4 Classification ............................................................................................................................................... 11

4.1 Classes of control ....................................................................................................................................... 11

4.2 Groups of control ....................................................................................................................................... 11

4.3 Classes of control functions ................................................................................................................... 12

4.4 Types of DC supplied controls............................................................................................................... 12

5 Units of measurement and test conditions ...................................................................................... 12

6 Design and Construction ......................................................................................................................... 12

6.1 General .......................................................................................................................................................... 12

6.2 Mechanical parts of the control ............................................................................................................ 12

6.2.1 Appearance .................................................................................................................................................. 12

6.2.2 Holes ............................................................................................................................................................... 12

6.2.3 Breather holes ............................................................................................................................................ 12

6.2.4 Screwed fastenings ................................................................................................................................... 13

6.2.5 Jointing .......................................................................................................................................................... 13

6.2.6 Moving parts ................................................................................................................................................ 13

6.2.7 Sealing caps.................................................................................................................................................. 13

6.2.8 Dismantling and reassembly ................................................................................................................. 13

6.2.9 Auxiliary canals and orifices ................................................................................................................. 13

6.2.10 Presetting device ....................................................................................................................................... 13

6.2.101 Adjustments ................................................................................................................................................. 13

6.2.102 Resistance to pressure ............................................................................................................................. 13

6.2.103 Blockage of canals and orifices ............................................................................................................. 13

6.2.104 Signal tube connections........................................................................................................................... 13

6.3 Materials ....................................................................................................................................................... 14

6.3.1 General material requirements ........................................................................................................... 14

6.3.2 Housing ......................................................................................................................................................... 14

6.3.3 Zinc alloys ..................................................................................................................................................... 14

6.3.4 Springs ........................................................................................................................................................... 14

6.3.5 Resistance to corrosion and surface protection ............................................................................. 14

6.3.6 Impregnation .............................................................................................................................................. 14

6.3.7 Seals for glands for moving parts ........................................................................................................ 14

6.4 Gas connections .......................................................................................................................................... 14

6.5 Electrical parts of the control ................................................................................................................ 14

6.6 Protection against internal faults for the purpose of functional safety ................................. 14

7 Performance ................................................................................................................................................ 14

7.1 General .......................................................................................................................................................... 14

7.2 Leak tightness ............................................................................................................................................. 14

7.2.1 Requirements ............................................................................................................................................. 14

7.2.2 Tests ............................................................................................................................................................... 15

7.2.101 External leak-tightness for gas signal carrying compartment(s) ............................................ 15

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oSIST prEN 88-1:2020
prEN 88-1:2019 (E)

7.2.102 External leak-tightness for air signal carrying compartment(s) .............................................. 15

7.3 Torsion and bending ................................................................................................................................. 15

7.4 Rated flow rate ............................................................................................................................................ 15

7.4.1 Requirements .............................................................................................................................................. 15

7.4.2 Test .................................................................................................................................................................. 15

7.4.3 Conversion of air flow rate ..................................................................................................................... 15

7.5 Durability ...................................................................................................................................................... 15

7.6 Performance tests for electronic controls ........................................................................................ 15

7.7 Long-term performance for electronic controls ............................................................................. 16

7.8 Data exchange ............................................................................................................................................. 16

7.101 Pressure regulator performance .......................................................................................................... 16

7.101.1 General ........................................................................................................................................................... 16

7.101.2 General test procedure ............................................................................................................................ 17

7.101.3 Class A pressure regulator performance ........................................................................................... 19

7.101.4 Class B pressure regulator performance ........................................................................................... 19

7.101.5 Class C pressure regulator performance ........................................................................................... 20

7.101.6 Endurance ..................................................................................................................................................... 21

7.101.7 Lock-up pressure ....................................................................................................................................... 22

7.101.8 Rendered inoperative pressure regulators ...................................................................................... 22

7.102 Pneumatic gas/air ratio pressure regulator performance ......................................................... 22

7.102.1 General ........................................................................................................................................................... 22

7.102.2 General test procedure ............................................................................................................................ 23

7.102.3 Control performance and stability ...................................................................................................... 23

7.102.4 Settling time ................................................................................................................................................. 25

7.102.5 Gas/air ratio adjustment ......................................................................................................................... 26

7.102.6 Offset adjustment ....................................................................................................................................... 26

7.102.7 Endurance ..................................................................................................................................................... 26

8 Electrical requirements ........................................................................................................................... 27

8.1 General ........................................................................................................................................................... 27

8.2 Protection by enclosure ........................................................................................................................... 27

8.101 Plug connections ........................................................................................................................................ 27

8.102 Power saving circuits ................................................................................................................................ 27

8.102.1 Closing of the valve .................................................................................................................................... 27

8.102.2 Overheating .................................................................................................................................................. 28

8.102.3 Test of power-saving circuits ................................................................................................................. 28

9 Electromagnetic compatibility (EMC) ................................................................................................. 28

9.1 Protection against environmental influences ................................................................................. 28

9.2 Supply voltage variations below 85 % of rated voltage ............................................................... 28

9.3 Voltage dips and interruptions ............................................................................................................. 28

9.4 Supply frequency variations .................................................................................................................. 28

9.5 Surge immunity tests ................................................................................................................................ 28

9.6 Electrical fast transient/burst ............................................................................................................... 28

9.7 Immunity to conducted disturbances induced by radio frequency fields ............................. 28

9.8 Immunity to radiated disturbances induced by radio frequency fields ................................ 28

9.9 Electrostatic discharge tests .................................................................................................................. 28

9.10 Power frequency magnetic field immunity tests ............................................................................ 28

9.11 Harmonics and interharmonics including mains signalling at a. c. power port, low

frequency immunity tests ....................................................................................................................... 29

10 Marking andinstructions ......................................................................................................................... 29

10.1 Marking .......................................................................................................................................................... 29

10.2 Installation, instructions ......................................................................................................................... 29

10.3 Warning notice ............................................................................................................................................ 31

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oSIST prEN 88-1:2020
prEN 88-1:2019 (E)

Annex A (informative) Gas connections in common use in the various countries ............................ 32

Annex B (informative) Leak-tightness test for gas controls — volumetric method ......................... 33

Annex C (informative) Leak-tightness test for gas controls — pressure loss method ..................... 34

Annex D (normative) Calculation 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 EU Directive 2014/68/EU .................................................................... 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 burners and

appliances burning gaseous or liquid fuels ..................................................................................... 40

Annex J (normative) Method for the determination of a Safety Integrity Level (SIL) ...................... 41

Annex K (normative) Method for the determination of a Peformance Level (PL)............................. 42

Annex L (informative) Relationship between Safety Integrity Level (SIL) and Peformance

Level (PL) ...................................................................................................................................................... 43

Annex M (normative) Reset functions ............................................................................................................... 44

Annex N (informative) Guidance document on environmental aspects ............................................... 45

Annex O (normative) Seals of elastomer, cork and synthetic fibre mixtures ...................................... 46

Annex AA (informative) Typical pressure regulators and pressure regulator parts ....................... 47

Annex BB (informative) Overview of requirements and test conditions (as given in

Clause 7), and examples of performance curves for pressure regulators ............................ 48

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of Regulation (EU) 2016/426 aimed to be covered .......................................... 54

Bibliography ................................................................................................................................................................. 60

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oSIST prEN 88-1:2020
prEN 88-1:2019 (E)
European foreword

This document (prEN 88-1:2019) 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 document is currently submitted to the CEN Enquiry.
This document will supersede EN 88-1:2011+A1:2016.

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).

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this

document.

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;

— EN 88-3, Pressure regulators and associated safety devices for gas appliances — Part 3: Pressure

and/or flow rate regulators for inlet pressures up to and including 500 kPa, electronic types.

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oSIST prEN 88-1:2020
prEN 88-1:2019 (E)
Introduction

This document is intended to be used in conjunction with EN 13611:2019. 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. It should be noted that these clauses and subclauses are not indicated as an addition.

Subclauses which are additional to those in EN 13611:2019 are numbered starting from 101. Additional

Annexes are designated as Annex AA, BB, CC, etc.

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 document. Pressure

regulators with PL or SIL classification do not automatically meet the requirements of this document.

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oSIST prEN 88-1:2020
prEN 88-1:2019 (E)
1 Scope

This document 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 document 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 document 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 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 161:2011, Automatic shut-off valves for gas burners and gas appliances

EN 13611:2019, Safety and control devices for burners and appliances burning gaseous and/or liquid

fuels - General requirements

EN 175301-803, Detail Specification: Rectangular connectors - Flat contacts, 0,8 mm thickness, locking

screw not detachable
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oSIST prEN 88-1:2020
prEN 88-1:2019 (E)
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 http://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
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 it’s outlet in response to control pressure

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 minimum and maximum values of the inlet pressure
3.109
maximum outlet pressure
2max
upper limit of the outlet pressure, as stated in the instructions
3.110
minimum outlet pressure
2min
lower limit of the outlet pressure, as stated in the instructions
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oSIST prEN 88-1:2020
prEN 88-1:2019 (E)
3.111
outlet pressure range
difference between minimum and maximum values of the outlet pressure
3.112
inlet setting pressure
inlet pressure at which the pressure regulator is set for test purposes
3.113
outlet setting pressure
outlet pressure at which the pressure regulator is set for test purposes
3.114
signal pressure

pressure, differential pressure or a combination of both applied to the regulator in order to provide the

specified outlet pressure
3.115
signal pressure range
range of signal pressure between the minimum and maximum values
3.116
load determining pressure

underpressure as a result of an air flow, e.g. produced by a sucking fan, through a restriction

3.117
gas/air ratio

slope of a straight line relationship between the outlet pressure p and signal pressure p

2 3
3.118
working diaphragm

flexible member which, under the influence of the forces arising from loading and pressure, operates

the control member
3.119
diaphragm plate
stiffening plate fitted to the diaphragm
3.120
lock-up pressure

outlet pressure at which a pressure regulator closes when the outlet of the pressure regulator is sealed

3.121
put out of action

block the operation of the pressure regulator by fixing the control member in the fully open position

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oSIST prEN 88-1:2020
prEN 88-1:2019 (E)
3.122
furnace pressure

pressure of combustion gases from the combustion chamber connected to the pressure regulator

3.123
signal chamber
part of the regula
...