EN 88-1:2007

SLOVENSKI STANDARD
01-januar-2008
1DGRPHãþD
SIST EN 88:1997
SIST EN 88:1997/A1:1997
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7ODþQLUHJXODWRUML]DYVWRSQHWODNHGRYNOMXþQRPEDU
Pressure governors and associated safety devices for gas appliances - Part 1: Pressure
governors for inlet pressures up to 500 mbar
Druckregler und zugehörige Sicherheitseinrichtungen für Gasgeräte - Teil 1: Druckregler
für Eingangsdrücke bis einschließlich 500 mbar
Régulateurs de pression et dispositifs de sécrité associés pour appareils a gaz - Partie 1:
Régulateurs de pression pour pression amont inférieure a 500 mbar
Ta slovenski standard je istoveten z: EN 88-1:2007
ICS:
23.060.40 7ODþQLUHJXODWRUML Pressure regulators
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 88-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2007
ICS 23.060.40 Supersedes EN 88:1991
English Version
Pressure regulators and associated safety devices for gas
appliances - Part 1: Pressure regulators for inlet pressures up to
and including 500 mbar
Régulateurs de pression et dispositifs de sécurité associés Druckregler und zugehörige Sicherheitseinrichtungen für
pour appareils à gaz - Partie 1: Régulateurs de pression Gasgeräte - Teil 1: Druckregler für Eingangsdrücke bis
pour pression amont inférieure ou égale à 500 mbar einschließlich 500 mbar
This European Standard was approved by CEN on 4 February 2007.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 88-1:2007: E
worldwide for CEN national Members.

Contents Page
1 Scope.6
2 Normative references .6
3 Terms and definitions.6
3.1 Pressure regulators .7
3.2 Pressures.7
3.2.1 General.7
3.2.2 Pressure regulator pressures.7
3.3 Pressure regulator flow rates .8
3.4 Component parts .8
3.5 Performance .9
4 Classification.9
4.1 Classes of pressure regulator .9
4.2 Groups of pressure regulator .9
4.3 Designation.9
5 Units of measurement and test conditions .9
5.1 Units of measurement .9
5.2 Test conditions.9
6 Construction requirements.10
6.1 General.10
6.2 Construction.10
6.2.1 General.10
6.2.2 Outlet pressure adjustment .10
6.2.3 Resistance to pressure.10
6.3 Materials.10
6.4 Gas connections .10
6.5 Seals for glands for moving parts.11
6.6 Pressure test nipples.11
7 Performance requirements .11
7.1 General.11
7.1.1 Requirements .11
7.1.2 Test for compliance .11
7.2 External leak tightness.12
7.3 Test for external leak tightness .12
7.4 Torsion and bending.12
7.5 Torsion and bending tests .12
7.6 Durability.12
7.7 Pressure regulator performance .12
7.7.1 General.12
7.7.2 General test procedure.13
7.7.3 Class A regulator performance .17
7.7.4 Test for class A regulators.17
7.7.5 Class B regulator performance .18
7.7.6 Test for class B regulators.18
7.7.7 Class C regulator performance .18
7.7.8 Test for class C regulators.18
7.7.9 Pressure drop requirements.19
7.7.10 Pressure drop tests .19
7.7.11 Durability of performance requirements .19
7.7.12 Test for durability of performance .19
7.7.13 Lock-up pressure .20
7.7.14 Test for lock-up pressure.20
8 Marking, installation and operating instructions.20
8.1 Marking .20
8.2 Installation, operating and servicing instructions.20
8.3 Warning notice .21
Annex A (informative) Typical pressure regulators and pressure regulator parts.22
Annex B (informative) Use of ISO 7-1:1994 and EN ISO 228-1:2003 threads for gas
connections (see 6.4).23
Annex C (informative) Summary of requirements and test conditions .24
C.1 Requirements .24
C.2 Test procedure .25
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 90/396/EEC.26

Foreword
This document (EN 88-1:2007) has been prepared by Technical Committee CEN/TC 58 “Safety and
control devices for gas burners and gas burning appliances”, 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 May 2008, and conflicting national standards shall be
withdrawn at the latest by May 2008.
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 supersedes EN 88:1991.
EN 88 consists of the following parts:
Part 1: Pressure regulators for inlet pressures up to and including 500 mbar;
Part 2: Pressure regulators for inlet pressures above 500 mbar up to and including 5 bar.
This European Standard was revised to make reference to EN 13611 and to increase the pressure
range to 500 mbar and connection up to and including DN 250, but not because of any “shortcoming”.
This European Standard is intended to be used in conjunction with EN 13611.
SIL classification according to EN 61508 cannot automatically be claimed based upon compliance
with this European Standard. Valves with 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,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Introduction
This European Standard is a particular standard for pressure regulators for gas burners and gas-
burning appliances which cites EN 13611 wherever possible. This European Standard supplements or
modifies the corresponding clauses of EN 1 3611. The construction and performance requirements
are as far as applicable in total conformity with EN 13611.
1 Scope
This European Standard specifies the safety, construction and performance requirements for pressure
regulators, (hereafter referred to as regulators), intended for use with gas burners and gas burning
st nd rd
appliances using fuel gases of the 1 , 2 and 3 families. This European Standard covers type
testing only. It also gives information necessary for the purchaser and user.
This European Standard is applicable to regulators, which may be tested independently of these
appliances, having a connection size up to and including DN 250 and a declared maximum working
pressure up to and including 500 mbar.
The methods of test given in this European Standard are intended for product type testing only. Tests
intended for production testing are not specifically included.
rd
Regulators intended to be used on installations for the 3 family gases are also covered by EN 13785
and EN 13786.
This European Standard does not cover:
a) pressure regulators connected directly to mains pipework or to a container that maintains a
standard distribution pressure;
b) pressure regulators intended for gas appliances to be installed out-of-doors and exposed to the
environment;
c) pressure regulators which use electrical auxiliary energy.
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 13611:2007, Safety and control devices for gas burners and gas burning appliances — General
requirements
EN ISO 228-1:2003, Pipe threads where pressure tight joints are not made on the threads — Part 1:
Dimensions, tolerances and designation (ISO 228-1:2000)
ISO 7-1:1994, Pipe threads where pressure-tight joints are made on the threads — Part 1:
Dimensions, tolerances and designation
ISO 7005-2:1988, Metallic flanges — Part 2: Cast iron flanges
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN 13611:2007 and
the following apply.
3.1 Pressure regulators
3.1.1
pressure regulator
device which maintains the outlet pressure constant independent of the variations in inlet pressure
and/or flow rate within defined limits
NOTE See Annex A.
3.1.2
adjustable pressure regulator
pressure regulator provided with means for changing the outlet pressure setting
3.2 Pressures
3.2.1 General
3.2.1.1
test pressure
pressure to be applied during a test
3.2.1.2
pressure drop
pressure difference with valve open to its fullest extent
3.2.2 Pressure regulator pressures
3.2.2.1
maximum inlet pressure
p
1 max
highest inlet pressure declared by the manufacturer at which the regulator may be operated
3.2.2.2
minimum inlet pressure
p
1 min
lowest inlet pressure declared by the manufacturer at which the regulator may be operated
3.2.2.3
inlet pressure range
range of inlet pressure between the maximum and minimum values
3.2.2.4
maximum outlet pressure
p
2 max
maximum outlet pressure declared by the manufacturer
3.2.2.5
minimum outlet pressure
p
2 min
minimum outlet pressure declared by the manufacturer
3.2.2.6
outlet pressure range
range of outlet pressure between the maximum and minimum values
3.2.2.7
setting point
inlet and outlet pressures declared by the manufacturer at which the pressure regulator is initially
adjusted for test purposes at a declared flow rate
3.2.2.8
inlet setting pressure
inlet pressure at which the regulator is set for test purposes
3.2.2.9
outlet setting pressure
outlet pressure to which the regulator is set for test purposes
3.3 Pressure regulator flow rates
3.3.1
setting flow rate
flow rate declared by the manufacturer, at which the pressure regulator is set for test purposes at
declared inlet and outlet pressures
3.3.2
flow rate
volume flowing through the pressure regulator in unit time
NOTE The nominal connection size of a pressure regulator does not necessarily determine its flow rate
range.
3.3.3
maximum flow rate
q
max
maximum rate, as a function of inlet and outlet pressures, declared by the manufacturer and
expressed in m /h of air at standard conditions
NOTE For a non-adjustable pressure regulator there is only one maximum flow rate.
3.3.4
minimum flow rate
q
min
minimum rate, as a function of inlet and outlet pressures, declared by the manufacturer and
expressed in m /h of air at standard conditions
NOTE For a non-adjustable pressure regulator there is only one minimum flow rate.
3.3.5
flow rate range
range of flow rate between the maximum and minimum values
3.4 Component parts
3.4.1
diaphragm
flexible member which, under the influence of the forces arising from loading and pressure, operates
the valve
3.4.2
diaphragm plate
stiffening plate fitted to the diaphragm
3.4.3
valve
device which varies the gas flow directly
3.5 Performance
3.5.1
lock-up pressure
outlet pressure at which a pressure regulator closes when the outlet of the pressure regulator is
sealed
NOTE The increase in outlet pressure is expressed either in mbar or as a percentage
3.5.2
put out of action
annul the operation of the regulator by fixing the valve in the full open position
4 Classification
4.1 Classes of pressure regulator
A pressure regulator is classified as class A, class B or class C according to the appropriate outlet
pressure and flow rate limits given in 7.7.1.
4.2 Groups of pressure regulator
Pressure regulators shall be classified by group in accordance with EN 13611:2007, 4.2.
4.3 Designation
A pressure regulator is designated by class and group, for example as 'A2' for a pressure regulator of
class A, group 2.
5 Units of measurement and test conditions
5.1 Units of measurement
Units of measurement shall be as given in EN 13611:2007, 5.1, 5.2 and 5.3.
5.2 Test conditions
Test conditions shall be in accordance with EN 13611, with the following additional requirement.
When carrying out performance tests at any particular setting, the minimum inlet pressure used shall
be at least 2 mbar in excess of the set outlet pressure.
6 Construction requirements
6.1 General
General requirements shall be in accordance with EN 13611:2007, 6.1.
6.2 Construction
6.2.1 General
Construction shall be in accordance with EN 13611:2007, 6.2, with the additional requirements given
in 6.2.2 and 6.2.3.
6.2.2 Outlet pressure adjustment
The outlet pressure adjustment 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 claimed by the manufacturer that a regulator can be put out of action,
appropriate means shall be provided to put the pressure regulator out of action.
6.2.3 Resistance to pressure
Parts of the 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 withstand a pressure equal to the
maximum inlet pressure.
6.3 Materials
Materials shall be in accordance with EN 13611:2007, 6.3.
6.4 Gas connections
Gas connections shall be in accordance with EN 13611:2007, 6.4, with the exception of 6.4.2 and
6.4.8.
Equivalent connection sizes shall be as given in Table 1.
NOTE Requirements for strainers are not applicable to pressure regulators.
Table 1 — Connection sizes
Designation of thread Nominal size of Outside diameter of
Nominal size to ISO 7-1:1994 flanges to tubes for
DN or to ISO 7005-2:1988 compression fittings
EN ISO 228-1:2003 (range in mm)
6 1/8 6 2 ≤ 5
8 1/4 8 6 ≤ 8
10 3/8 10 10 ≤ 12
15 1/2 15 14 ≤ 16
20 3/4 20 18 ≤ 22
25 1 25 25 ≤ 28
32 1¼  32 30 ≤ 32
40 1½ 40 35 ≤ 40
50 2 50 42 ≤ 50
—
65 2½ 65
—
80 3 80
100 - 100 —
—
125 125
—
150 - 150
—
200 - 200
—
250 - 250
6.5 Seals for glands for moving parts
These shall be in accordance with EN 13611:2007, 6.3.8.
6.6 Pressure test nipples
Pressure test nipples, where fitted, shall be in accordance with EN 13611:2007, 6.4.7.
7 Performance requirements
7.1 General
7.1.1 Requirements
The pressure regulator shall conform to EN 13611:2007, 7.1 with the following addition.
rd
If it is claimed that the regulator can be rendered inoperative, for example, for 3 family gas
applications, the method shall be given in the manufacturer’s instructions.
7.1.2 Test for compliance
The action of the regulator shall be rendered inoperative in accordance with the method given in the
manufacturer’s instructions. After it has been confirmed by observation that the valve is fixed in the
fully open position, the leak tightness is checked in accordance with 7.2 and 7.3.
When the action of the regulator is restored, the regulator shall continue to conform to the full
requirements of this European Standard.
7.2 External leak tightness
Pressure re
...