EN 1491:2022
(Main)Building valves - Expansion valves - Tests and requirements
Building valves - Expansion valves - Tests and requirements
This document specifies dimensions, materials and performance requirements (including methods of test) for expansion valves, of nominal sizes from DN 15 to DN 32, having working pressures ) from 0,1 MPa (l bar) to 1,0 MPa (10 bar).
Expansion valves are intended for fitting to the cold potable water supply of storage water heaters, having a maximum distribution temperature of 95 °C, for all energy sources.
Expansion valves do not control the temperature and alone do not constitute the protection required for storage water heaters. Expansion valves limit pressure, in the water heaters to what they are fitted, that is produced by thermal expansion of the water.
NOTE The use of the device specified in this document does not override the need to use controls (e.g. thermostats and cut-outs) which act directly on the power sources of water heaters (for more information see Annex A).
Gebäudearmaturen - Sicherheitsventile für Expansionswasser - Prüfungen und Anforderungen
Dieses Dokument legt Abmessungen, Werkstoffe und Leistungsanforderungen (einschließlich Prüfverfahren) für Sicherheitsventile für Expansionswasser mit einer Nennweite von DN 15 bis DN 32 und Betriebsdrücken von 0,1 MPa (1 bar) bis 1,0 MPa (10 bar) fest.
Sicherheitsventile für Expansionswasser sind für den Anschluss an die kalte Trinkwasserversorgung von Speicherwassererwärmern mit einer maximalen Gebrauchstemperatur von 95 °C, unabhängig von den verwendeten Energiequellen, bestimmt.
Das Expansionsventil für Expansionswasser überwacht nicht die Temperaturen und stellt auch nicht die einzige für einen Speicherwassererwärmer erforderliche Sicherheit dar. Das Sicherheitsventil für Expansionswasser begrenzt den durch die Wärmeausdehnung des Wassers verursachten Druckanstieg im Wassererwärmer, in den es eingebaut ist.
ANMERKUNG Durch die Verwendung des in diesem Dokument beschriebenen Gerätes wird die Notwendigkeit zu Verwendung von Steuereinrichtungen (z. B. Thermostate und Auslöser), die direkt an den Leistungsquellen von Warmwasserbereitern zum Einsatz kommen, nicht aufgehoben (für weitere Informationen siehe Anhang A).
Robinetterie de bâtiment - Soupapes d'expansion - Essais et exigences
Le présent document spécifie les dimensions, les matériaux et les exigences de performance (y compris les méthodes d´essai) auxquels doivent satisfaire les soupapes d’expansion de diamètre nominal allant de DN 15 à DN 32, dont les pressions de service ) sont comprises entre 0,1 MPa (1 bar) et 1,0 MPa (10 bar).
Les soupapes d’expansion sont destinées à être montées au niveau de l’alimentation en eau potable froide des chauffe-eau à accumulation, dont la température de distribution ne dépasse pas 95 °C, quelles que soient les sources d’énergie utilisées.
Les soupapes d'expansion ne contrôlent pas la température et ne constituent pas, à elles seules, la protection nécessaire aux chauffe-eau à accumulation. Les soupapes d’expansion limitent la pression dans les chauffe-eau où elles sont montées, occasionnée par la dilatation thermique de l’eau.
NOTE L'utilisation du dispositif spécifié dans le présent document ne doit pas prévaloir sur la nécessité d'utiliser des commandes (telles que les thermostats et dispositifs de coupure) qui agissent directement sur les sources d'énergie des chauffe-eau (pour plus d’informations, voir l’Annexe A).
Ventili v stavbah - Ekspanzijski ventili - Preskusi in zahteve
Ta dokument določa mere, materiale in tehnične zahteve (vključno s preskusnimi metodami) za ekspanzijske ventile nazivnih velikosti od DN 15 do DN 32 z delovnimi tlaki od 0,1 MPa (1 bar) do 1,0 MPa (10 barov).
Ekspanzijski ventili so namenjeni vgradnji na dovod hladne pitne vode akumulacijskih grelnikov vode z najvišjo distribucijsko temperaturo 95 °C za vse vire energije.
Ekspanzijski ventili ne regulirajo temperature in sami po sebi ne predstavljajo zaščite, zahtevane za akumulacijske grelnike vode. Ekspanzijski ventili omejujejo tlak, ki nastane zaradi toplotnega raztezanja vode v grelnikih vode, v katere so vgrajeni.
OPOMBA: Uporaba naprave, navedene v tem dokumentu, ne izključuje zahteve za uporabo krmilnikov (npr. termostatov in izklopnih stikal), ki delujejo neposredno na vire napajanja grelnikov vode (za več informacij glej dodatek A).
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2022
Nadomešča:
SIST EN 1491:2000
Ventili v stavbah - Ekspanzijski ventili - Preskusi in zahteve
Building valves - Expansion valves - Tests and requirements
Gebäudearmaturen - Sicherheitsventile für Expansionswasser - Prüfungen und
Anforderungen
Robinetterie de bâtiment - Soupapes d'expansion - Essais et exigences
Ta slovenski standard je istoveten z: EN 1491:2022
ICS:
23.060.01 Ventili na splošno Valves in general
91.140.60 Sistemi za oskrbo z vodo Water supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 1491
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2022
EUROPÄISCHE NORM
ICS 91.140.60 Supersedes EN 1491:2000
English Version
Building valves - Expansion valves - Tests and
requirements
Robinetterie de bâtiment - Soupapes d'expansion - Gebäudearmaturen - Sicherheitsventile für
Essais et exigences Expansionswasser - Prüfungen und Anforderungen
This European Standard was approved by CEN on 13 June 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, Turkey 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 1491:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Materials and surface finishes . 8
4.1 General . 8
4.2 Materials . 9
4.3 Detection of residual stress . 9
4.3.1 General . 9
4.3.2 Test . 9
4.3.3 Test method (Procedure) . 9
4.3.4 Requirements .10
4.4 Corrosion resistance test .10
4.4.1 General .10
4.4.2 Test method .10
4.4.3 Requirements .10
4.5 Coating adherence test .10
4.5.1 General .10
4.5.2 Test method .10
4.5.3 Requirements .11
4.6 Compatibility with the products used for shock disinfection of the networks.11
4.6.1 General .11
4.6.2 Test method .11
4.6.3 Requirements .11
5 Design, dimensional and pressure requirements .12
5.1 General guidance .12
5.2 Dimensional characteristics.12
5.2.1 Nominal outlet diameter .12
5.2.2 End connections .12
5.3 Expansion valve outlet connection to air break to drain.12
5.4 Expansion valve discharge connection to drain service .12
5.5 Connections .12
5.6 Pressures .13
5.6.1 General .13
5.6.2 Nominal set pressure (P ) .13
nr
5.6.3 Water tightness pressure (P ) .13
e
5.6.4 Opening pressure (Po) .13
5.6.5 Rating pressure (P ) .13
dn
5.6.6 Clossing pressure (P ) .13
f
5.6.7 Initial opening pressure (P ) .13
dc
6 Apparatus .13
6.1 General .13
6.2 Tolerances of parameters and accuracy of measure instruments .14
6.2.1 Tolerances on set parameters . 14
6.2.2 Accuracy of measuring instruments . 14
6.2.3 Test media . 14
7 Hydraulic tests and requirements . 14
7.1 Cold water pressure tests . 14
7.1.1 General . 14
7.1.2 Water tightness pressure (P ) test . 14
e
7.1.3 Repeat tests . 15
7.2 Endurance test . 15
7.2.1 Procedure . 15
7.2.2 Requirement . 16
7.3 Easing gear (manual control device) . 16
7.3.1 Operation of the easing gear. 16
7.3.2 Easing gear endurance test . 16
8 Mechanical tests and requirements . 16
8.1 Mechanical strength . 16
8.1.1 Pressure test of the body of the expansion valve . 16
8.1.2 Bending moment test of the body of the expansion valve . 17
8.2 Mechanical strength of the easing gear . 18
8.2.1 Procedure . 18
8.2.2 Requirement . 18
8.3 Torsional strength of the expansion valve's body . 18
8.3.1 General . 18
8.3.2 Procedure . 18
8.3.3 Requirement . 19
8.4 Torque test of the captive rotating nuts/tail pieces . 19
8.4.1 General . 19
8.4.2 Procedure . 19
8.4.3 Requirement . 19
9 Classification . 19
10 Designation . 20
11 Marking . 20
12 Technical documents and presentation at delivery . 21
Annex A (informative) Classification of water heaters according to heating method . 22
A.1 Indirect heating . 22
A.2 Classification of water heaters according to heating method . 22
A.2.1 Indirect heating . 22
A.2.2 Direct heating . 23
Bibliography . 24
European foreword
This document (EN 1491:2022) has been prepared by Technical Committee CEN/TC 164 “Water supply”,
the secretariat of which is held by AFNOR.
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 January 2023, and conflicting national standards shall
be withdrawn at the latest by January 2023.
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 1491:2000.
In comparison with the previous edition, the following technical modifications have been made:
— chapter on materials was completely revised;
— testing with disinfectant was introduced;
— torque test was added;
— testing of the expansion valve was changed and optimized;
— coating test procedure was revised;
— normative references were updated;
— editorial changes have been made throughout the entire document.
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, Turkey and the United
Kingdom.
Introduction
With regard to potential adverse effect on the quality of water intended for human consumption, caused
by the product covered by this document:
1) This document provides no information as to whether the product may be used without restriction
in any of the Member States of the EU or EFTA.
2) It should be noted that, whilst awaiting the adoption of verifiable European criteria, existing national
regulations concerning the use and or the characteristics of this product remain in force.
1 Scope
This document specifies dimensions, materials and performance requirements (including methods of
test) for expansion valves, of nominal sizes from DN 15 to DN 32, having working pressures ) from
0,1 MPa (l bar) to 1,0 MPa (10 bar).
Expansion valves are intended for fitting to the cold potable water supply of storage water heaters, having
a maximum distribution temperature of 95 °C, for all energy sources.
Expansion valves do not control the temperature and alone do not constitute the protection required for
storage water heaters. Expansion valves limit pressure, in the water heaters to what they are fitted, that
is produced by thermal expansion of the water.
NOTE The use of the device specified in this document does not override the need to use controls (e.g.
thermostats and cut-outs) which act directly on the power sources of water heaters (for more information see
Annex A).
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 806 (all parts), Specifications for installations inside buildings conveying water for human consumption
EN 1254-2, Copper and copper alloys - Plumbing fittings - Part 2: Compression fittings for use with copper
tubes
EN 1717, Protection against pollution of potable water in water installations and general requirements of
devices to prevent pollution by backflow
EN 10226-1, Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external
threads and parallel internal threads - Dimensions, tolerances and designation
EN ISO 6509 (all parts), Corrosion of metals and alloys - Determination of dezincification resistance of brass
(ISO 6509)
EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions,
tolerances and designation (ISO 228-1)
EN ISO 9227, Corrosion tests in artificial atmospheres - Salt spray tests (ISO 9227)
ISO 6957, Copper alloys — Ammonia test for stress corrosion resistance
All pressures are gauge unless otherwise stated.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
expansion valve
valve that limits the pressure of the water in the water heater to a predetermined value by discharging
water to drain
3.2
air break to drain
device that prevents discharged water from returning to the expansion valve and thus to the water heater
3.3
nominal set pressure
Pnr
pressure of the expansion valve which is set on production
Note 1 to entry: The “nominal set pressure” (P ) is often called “set pressure”.
nr
Key
Y pressure
X time
Figure 1 — Pressures
3.4
water tightness pressure
P
e
pressure up to which the expansion valve is closed
Note 1 to entry: See Figure 1.
3.5
initial opening pressure
P
dc
pressure at which the expansion valve opens for the first time, as indicated by the first droplet of water
at the outlet of the expansion valve, after a period of storage
Note 1 to entry: See Figure 1.
3.6
opening pressure
P
o
pressure at which the expansion valves opens as indicated by the appearance of water at the outlet of the
expansion valve
Note 1 to entry: See Figure 1.
3.7
rating pressure
P
dn
pressure at which the discharged flow is above the limit
Note 1 to entry: See Figure 1 and Table 2.
3.8
closing pressure
P
f
pressure at which the expansion valve closes after having reached the rating pressure
Note 1 to entry: See Figure 1.
4 Materials and surface finishes
4.1 General
The selection of materials is the responsibility of the manufacturer, provided they satisfy the following
requirements:
a) materials and coatings shall not contaminate the potable water;
b) in a technical document, the manufacturer shall state the nature of the materials and coatings used;
c) materials with insufficient corrosion resistance (e.g. cast iron, aluminium) shall have additional
protection;
d) the materials used shall be suitable for the temperatures specified in the tests in this document;
e) the materials, and in particular copper alloys, for which recommendations or international standards
exist, shall comply with the relevant recommendations or international standards.
4.2 Materials
All materials coming into contact with water intended for human consumption shall present no health
risk nor cause any change to the water in terms of quality, appearance, smell or taste.
NOTE It is pointed out that while awaiting the adoption of verifiable European criteria for testing materials in
contact with water intended for human consumption, existing national regulations concerning the use and/or the
characteristics of these products remain in force.
Copper-zinc alloys containing more than 10 % zinc are subject to dezincification when submitted to
water capable of dezincification. In the countries where the use of products made of dezincification
resistant materials is required, the materials used shall guarantee a dezincification depth less than
200 μm in any direction. For this purpose, materials shall be tested in accordance with
EN ISO 6509 (all parts) and the product shall be marked in compliance with the indications according to
Clause 11.
4.3 Detection of residual
...
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