EN 88-1:2011+A1:2016

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

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.

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
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
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
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
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

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,
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.
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.
EN 161:2011 , Automatic shut-off valves for gas burners and gas appliances
EN 13611:2007, Safety and control devices for gas burners and gas burning appliances — General
requirements
EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)
EN 60730-1:2000, Automatic electrical controls for household and similar use — Part 1: General
requirements (IEC 60730-1:1999, modified)

)
To be published.
EN 175301-803, Detail Specification: Rectangular connectors — Flat contacts, 0,8 mm thickness, locking
screw not detachable
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13611:2007 and the following
apply.
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
p
2max
upper limit of the outlet pressure, as stated in the installation and operating instructions
3.110
minimum outlet pressure
p
2min
lower limit of the outlet pressure, as stated in the installation and operating instructions
3.111
outlet pressure range
difference between minimum and maximum values of the outlet pressure
3.112
inlet setting pressure
p
1s
inlet pressure at which the pressure regulator is set for test purposes
3.113
outlet setting pressure
p
2s
outlet pressure at which the pressure regulator is set for test purposes
3.114
signal pressure
p
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
p
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 p2 and signal pressure p3
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
p
2f
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
3.122
furnace pressure
pressure of combustion gases from the combustion chamber connected to the pressure regulator
3.123
signal chamber
part of the regulator to which the air signal pressure, gas pressure, or furnace pressure signal is
connected
3.124
signal connection
connection that is used to convey pressure from part of an installation to the signal chamber
3.125
offset
outlet pressure shift at pneumatic gas/air ratio pressure regulators independent of signal or load
determining pressure(s)
NOTE Typically this is achieved by means of a spring.
3.126
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 For further information refer to Figure 1.

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 1 — Step response of a transfer element
3.127
steady state value
outlet pressure measured after step response (control signal remains constant)
3.128
settling tolerance
maximum difference between the current outlet pressure and its steady state value
3.129
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
3.130
settling time
time counted from start of the step change of the signal pressure or load determining pressure until the
outlet pressure remains in the settling tolerance
3.131
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
3.132
withstand pressure
pressure that is withstood without degraded characteristic after returning below the maximum inlet
pressure
[EN 1854:2010, 3.116]
NOTE The withstand pressure is equal to or higher than the maximum inlet pressure.
3.133
safety shut-off device
SSD
device whose function is to stay 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
[EN 88-2:2007, 3.3.1]
4 Classification
4.1 Classes of control
EN 13611:2007, 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.
Gas/air ratio pressure regulators are not classified.
4.2 Groups of control
Shall be according to EN 13611:2007, 4.2.
4.3 Classes of control functions
EN 13611:2007, 4.3 is not applicable.
5 Units of measurement and test conditions
Shall be according to EN 13611:2007, Clause 5.
6 Construction requirements
6.1 General
Shall be according to EN 13611:2007, 6.1 with the following addition:
The withstand pressure shall be stated in the installation and operating instructions. If no withstand
pressure is stated, the withstand pressure is equal to the maximum inlet pressure.
6.2 Mechanical parts of the control
6.2.1 Appearance
Shall be according to EN 13611:2007, 6.2.1.
6.2.2 Holes
Shall be according to EN 13611:2007, 6.2.2.
6.2.3 Breather holes
Shall be according to EN 13611:2007, 6.2.3 with the following 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 dm³/h for
breather holes can 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;
— stress the diaphragm with the temperature and pressure stress test of 6.2.4;
— after the tests of 6.2.4 the leakage rate shall fulfil the requirements of 7.2.
6.2.4 Test for leakage of breather holes
Shall be according to EN 13611:2007, 6.2.4 with the following addition:
If for indirect regulators the alternative requirement of 6.2.3 is used, the following test applies:
— leave the regulator diaphragm as is;
— store one pressure regulator for 1 h ± 5 min at 135 °C ± 2 °C ambient temperature;
— keep the 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 7.3.2.
6.2.5 Screwed fastenings
Shall be according to EN 13611:2007, 6.2.5.
6.2.6 Jointing
Shall be according to EN 13611:2007, 6.2.6.
6.2.7 Moving parts
Shall be according to EN 13611:2007, 6.2.7.
6.2.8 Sealing caps
Shall be according to EN 13611:2007, 6.2.8.
6.2.9 Dismantling and reassembly
Shall be according to EN 13611:2007, 6.2.9.
6.2.101 Adjustments
The adjustments (e.g. outlet pressure, offset and gas/air-ratio) shall be readily accessible to authorised
persons, but there shall be provision for sealing after adjustment. Means shall be provided to
discourage interference by unauthorised persons. If it is stated in the installation and operating
instructions that a pressure regulator can be put out of action, appropriate means shall be provided to
put the pressure regulator out of action.
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 Blockage of canals and orifices
Blockage of auxiliary canals and orifices shall not lead to an unsafe situation otherwise they shall be
protected against blockage by suitable means.
6.2.104 Signal tube connections
Requirements on connections for gas pressure, air pressure or furnace pressure signal tubes shall be
stated in the installation and operating instructions.
6.3 Materials
6.3.1 General material requirements
Shall be according to EN 13611:2007, 6.3.1.
6.3.2 Housing
Shall be according to EN 13611:2007, 6.3.2 with the following modification:
The withstand pressure shall be used instead of maximum inlet pressure, if applicable.
6.3.3 Test for leakage of housing after removal of non-metallic parts
Shall be according to EN 13611:2007, 6.3.3 with the following addition and modification:
Addition:
Any breather holes shall be blocked.
Modification:
The withstand pressure shall be used instead of maximum inlet pressure, if applicable. The test shall be
performed in accordance with 7.3.2.
6.3.4 Zinc alloys
Shall be according to EN 13611:2007, 6.3.4.
6.3.5 Springs providing closing and/or sealing force
EN 13611:2007, 6.3.5 is not applicable.
6.3.6 Resistance to corrosion and surface protection
Shall be according to EN 13611:2007, 6.3.6.
6.3.7 Impregnation
Shall be according to EN 13611:2007, 6.3.7.
6.3.8 Seals for glands for moving parts
Shall be according to EN 13611:2007, 6.3.8.
6.4 Gas connections
6.4.1 Making connections
Shall be according to EN 13611:2007, 6.4.1.
6.4.2 Connection sizes
Shall be according to EN 13611:2007, 6.4.2.
6.4.3 Threads
Shall be according to EN 13611:2007, 6.4.3.
6.4.4 Union joints
Shall be according to EN 13611:2007, 6.4.4.
6.4.5 Flanges
Shall be according to EN 13611:2007, 6.4.5.
6.4.6 Compression fittings
Shall be according to EN 13611:2007, 6.4.6.
6.4.7 Nipples for pressure test
Shall be according to EN 13611:2007, 6.4.7.
6.4.8 Strainers
Shall be according to EN 13611:2007, 6.4.8 with the following addition:
Strainers fitted to controls of DN 25 and above shall be accessible for cleaning or replacement without
the need to remove the control body by dismantling threaded or welded pipe work.
6.5 Electronic parts of the control
EN 13611:2007, 6.5 is not applicable.
6.6 Protection against internal faults for the purpose of functional safety
EN 13611:2007, 6.6 is not applicable.
7 Performance
7.1 General
Shall be according to EN 13611:2007, 7.1.
7.2 Leak tightness
Shall be according to EN 13611:2007, 7.2 with the following addition:
For signal chamber(s) without combustion gas signal carrying compartment(s), when tested according
to 7.3.101, the leakage rate from the signal chamber(s) shall not exceed the leakage rate at the
maximum signal pressure stated in the installation and operating instructions before and after the tests
specified in 7.102.7.
7.3 Test for leak tightness
7.3.1 General
Shall be according to EN 13611:2007, 7.3.1 with the following modification:
If stated in the installation and operating instructions that the regulator shall be used in combination
with a safety shut-off device upstream of the regulator the following alternative external leakage test
can be used:
For external leakage carry out 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).
The test results shall meet the requirements of 7.2.
7.3.2 External leak-tightness
Shall be according to EN 13611:2007, 7.3.2 with the following addition:
If applicable the additional test conditions of 7.3.1 shall be taken into account.
7.3.3 Internal leak-tightness
EN 13611:2007, 7.3.3 is not applicable.
7.3.101 External leak-tightness for 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.
7.4 Torsion and bending
Shall be according to EN 13611:2007, 7.4.
7.5 Torsion and bending tests
Shall be according to EN 13611:2007, 7.5.
7.6 Rated flow rate
Shall be according to EN 13611:2007, 7.6.
7.7 Test for rated flow
7.7.1 Apparatus
Shall be according to EN 13611:2007, 7.7.1.
7.7.2 Test procedure
Shall be according to EN 13611:2007, 7.7.2 with the following addition:
If rated flow rate for pressure regulators as stated in the installation and operating instructions is
specified for the control member in the fully open position, the test shall be performed with the control
member in that position.
7.7.3 Conversion of air flow rate
Shall be according to EN 13611:2007, 7.7.3.
7.8 Durability
Shall be
...