oSIST prEN 1489:2026

• Abstract:

  This document specifies dimensions, materials and performance requirements, including methods of test, for pressure safety valves, of nominal sizes from DN 15 to DN 40, having working pressures from 0,1 MPa (1 bar) to 1,0 MPa (10 bar).; Pressure safety valves are intended for fitting to the potable water supply of storage water heaters, having a maximum storage temperature of 95 °C.; Pressure safety valves limit the pressure in hot water heaters.; Pressure safety valves do not control the temperature and alone do not constitute the protection required for storage water heaters. They are not intended to act as expansion valves under normal conditions.; 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).

• Status: Not Published
• Public Enquiry End Date: 24-Nov-2026
• ICS: 23.060.01 - Valves in general
• ICS: 91.140.60 - Water supply systems
• Technical Committee: IOVO - Water supply and waste water engineering
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 02-Oct-2026
• Due Date: 19-Feb-2027
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Ref Project: prEN 1489 - Building valves - Pressure safety valves - Tests and requirements

• Revises: SIST EN 1489:2000 - Building valves - Pressure safety valves - Tests and requirements
• Effective Date: 18-Dec-2024

SLOVENSKI STANDARD
01-november-2026
Ventili v stavbah - Varnostni tlačni ventili - Preskusi in zahteve
Building valves - Pressure safety valves - Tests and requirements
Gebäudearmaturen - Sicherheitsventile - Prüfungen und Anforderungen
Robinetterie de bâtiment - Soupapes de sécurité - Essais et exigences
Ta slovenski standard je istoveten z: prEN 1489
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.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2026
ICS 91.140.60 Will supersede EN 1489:2000
English Version
Building valves - Pressure safety valves - Tests and
requirements
Robinetterie de bâtiment - Soupapes de sécurité - Gebäudearmaturen - Sicherheitsventile - Prüfungen
Essais et prescriptions und Anforderungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 164.
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, Türkiye 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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1489:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Materials and surface finishes . 9
4.1 General. 9
4.2 Materials . 9
4.3 Detection of residual stress . 10
4.3.1 General. 10
4.3.2 Principle . 10
4.3.3 Procedure . 10
4.3.4 Requirements . 10
4.4 Corrosion resistance test . 11
4.4.1 General. 11
4.4.2 Procedure . 11
4.4.3 Requirements . 11
4.5 Coating adherence test (excluding cosmetic coatings) . 11
4.5.1 General. 11
4.5.2 Procedure . 11
4.5.3 Requirements . 12
5 Compatibility of the valve with disinfection . 12
5.1 General. 12
5.2 Requirements . 12
5.3 Procedure . 12
6 Design and dimensional characteristics . 13
6.1 General. 13
6.2 Dimensional characteristics . 13
6.2.1 End connections . 13
6.2.2 Pressure safety valve outlet connection to air break to drain . 14
6.2.3 Pressure safety valve discharge connection to drain device . 14
6.2.4 Connections . 14
6.2.5 Replacing the cartridge of the pressure safety valve . 14
6.2.6 Operating control . 14
7 Tolerances of parameters and accuracy of measure instruments . 14
7.1 General. 14
7.2 Tolerances on set parameters . 15
7.3 Accuracy of measuring instruments . 15
7.4 Test media . 15
8 Mechanical tests . 15
8.1 Mechanical strength . 15
8.1.1 Pressure test of the body of the pressure safety valve . 15
8.1.2 Bending test of the body of the pressure safety valve . 16
8.1.3 Torsional strength test of the pressure safety valve’s body . 16
8.1.4 Mechanical strength test of the operating control of the pressure safety valve . 17
9 Pressure safety valve . 17
9.1 Hydraulic tests . 17
9.1.1 Pressures . 17
9.1.2 Cold water pressure test . 18
9.1.3 Steam test . 19
9.2 Endurance test . 20
9.2.1 Procedure . 20
9.2.2 Requirements . 20
9.3 Operating control tests . 21
9.3.1 Operation test . 21
9.3.2 Endurance test . 21
9.4 Air break to drain . 21
9.5 Resistance to thermal shocks test for plastic components. 21
9.5.1 Procedure . 21
9.5.2 Requirements . 21
10 Acoustic tests . 22
11 Classification . 22
12 Designation . 23
13 Marking . 23
14 Technical documents and presentation at delivery . 24
Annex A (informative) Test sequences . 25
Annex B (informative) Classification of water heaters according to heating method . 27
Annex C (informative) Disinfection of test rig . 29
Bibliography . 30

European foreword
This document (prEN 1489:2026) has been prepared by Technical Committee CEN/TC 164 “Water
supply”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1489:2000.
— chapter on materials was completely revised;
— testing with disinfectant was introduced;
— coating test procedure was revised;
— normative references were updated;
— editorial changes have been made throughout the entire document.
Introduction
With regard to potential adverse effect on the quality of water intended for human consumption, caused
by the product covered by this document:
a) 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.
b) 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 pressure safety valves, of nominal sizes from DN 15 to DN 40, having working pressures from
0,1 MPa (1 bar) to 1,0 MPa (10 bar).
Pressure safety valves are intended for fitting to the potable water supply of storage water heaters,
having a maximum storage temperature of 95 °C.
Pressure safety valves limit the pressure in hot water heaters.
Pressure safety valves do not control the temperature and alone do not constitute the protection required
for storage water heaters. They are not intended to act as expansion valves under normal conditions.
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 806-5, Specifications for installations inside buildings conveying water for human consumption —
Part 5: Operation and maintenance
EN 1254-2, Copper and copper alloys — Plumbing fittings — Part 2: Compression fittings for use with
copper tubes
EN 1488, Building valves — Expansion groups — Tests and requirements
EN 1717, Protection against pollution of water intended for human consumption in potable water
installations and general requirements for 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
copper alloys with zinc (ISO 6509)
EN ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests (ISO 9227)
ISO 691, Assembly tools for screws and nuts — Wrench and socket openings — Tolerances for general use
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/

All pressures are gauge unless otherwise stated.
3.1
additional outlet connection
outlet connection that allows cold potable water to be supplied to an additional device
Note 1 to entry: For example, inline hot water supply tempering valves etc.
3.2
pressure safety valve
valve that limits the pressure of the water in the water heater to a predetermined value by discharging
water to the drain and in case of temperature control failure, discharging the energy stored as water or
steam
Note 1 to entry: For the purpose of this standard the pressure safety valve is hereafter referred as the “device”.
3.3
drain device or drain function
device that allows the water heater to be drained without removing the pressure safety valve and the
outlet connection which is also used to discharge water or steam from the pressure safety valve
3.4
air break to drain
vertical distance realised by air inlets or full disconnection between the lowest point of the outlet and the
spill-over level of the atmospheric drain overflow
3.5
nominal set pressure
P
nr
pressure of the pressure safety valve which is set on production
Note 1 to entry: The “nominal set pressure” (Pnr) is often called “set pressure”.
3.6
water tightness pressure
P
e
pressure up to which the pressure safety valve is closed
Note 1 to entry: See Figure 1.
3.7
initial opening pressure
Pdc
pressure at which the pressure safety valve opens for the first time
3.8
initial opening pressure
P
dc, water
pressure at which the pressure safety valve opens for the first time, as indicated by the first
droplet of water at the outlet of the pressure safety valve, after a period of storage
Note 1 to entry: See Figure 1.
3.9
initial opening pressure
P
dc, steam
pressure at which the pressure safety valve opens for the first time, as indicated by the first
appearance of steam at the outlet of the pressure safety valve, after a period of storage
Note 1 to entry: See Figure 1.
3.10
opening pressure
P
o
pressure at which the pressure safety valve opens
3.11
opening pressure
P
o, water
pressure at which the pressure safety valve opens, as indicated by the appearance of water at
the discharge connection of the pressure safety valve
Note 1 to entry: See Figure 1.
3.12
opening pressure
P
o, steam
pressure at which the pressure safety valve opens, as indicated by the appearance of steam at
the discharge connection of the pressure safety valve
3.13
rating pressure
P
dn
pressure at which the discharged flow is above the limit given in Table 6 and Table 7
Note 1 to entry: See Figure 1.
3.14
closing pressure
P
f
pressure at which the pressure safety valve closes after having reached the rating pressure
Note 1 to entry: See Figure 1.
Key
Y pressure
X time
Figure 1 — Pressures
4 Materials and surface finishes
4.1 General
NOTE The selection of materials is normally the responsibility of the manufacturer.
The materials shall satisfy the following requirements:
a) The materials and coatings shall not contaminate the potable water.
b) The nature of the materials and coatings used shall be stated in a technical document.
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.
Copper-zinc alloys containing more than 15 % 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 the
EN ISO 6509 series and the product shall be marked in compliance with the indications according to
Clause 14.
4.3 Detection of residual stress
4.3.1 General
This test shall be performed for bodies made out of material potentially susceptible to stress corrosion
cracking and with female threads according to EN 10226-1 and compression ends according to
EN 1254-2.
4.3.2 Principle
This test is based on ISO 6957. Its purpose is to verify the resistance to cracking under stress corrosion
in ammonia medium (as described in 4.3.3, b)).
The test entails exposing test specimens consisting of the assembled device in an atmosphere loaded with
ammonia vapour.
4.3.3 Procedure
The paragraph below is integrated from ISO 6957.
Test solution:
a) Solutions of analysis quality and of distilled water shall be used.
b) Solution of ammonia at 20 % (in weight) shall be used.
c) The pH of the test solution shall be adjusted to 9,5 by using hydrochloric acid.
d) The test temperature shall be (23 ± 2) °C with a measurement uncertainty of ± 1 K.
Test specimen:
a) The test specimen consists of three samples of a single assembled product. The test specimen shall
be inserted into the test enclosure under no stress.
Instructions:
a) Rinse the test specimens with a clean non-chlorinated solvent (for example, ethanol).
b) Let it dry in the air.
c) Insert the test specimens into the test enclosure along with the ammonia solution. The volume of the
container made of glass (e.g. desiccator) shall be minimum (10 ± 1) l.
d) The volume of the solution inserted shall be (200 ± 10) ml per 3 l of total volume of the container
(e.g. for a 10 l container it means (667 ± 33) ml).
e) Place the test specimens in the container in such a way that they will not touch each other and that
they will not be in contact with the solution.
After an exposure of (24 ± 2) h, remove the test specimens and rinse them.
4.3.4 Requirements
After the test, the devices shall be inspected visually for stress corrosion cracking. No cracking shall occur
on any component. Test according to 9.1.2 (cold water pressure test) shall be fulfilled.
The results shall not deviate by more than 10 % from the original values.
4.4 Corrosion resistance test
4.4.1 General
The purpose of the corrosion resistance test is to qualify all used materials of the external part of the
product. The whole device shall be tested, not only the parts in contact with potable water. Positioning
restrictions given by the manufacturer shall be taken into account when placing the device into the tank.
4.4.2 Procedure
Samples shall be prepared for the corrosion resistance test as described as follows.
Carry out the test under the conditions described in EN ISO 9227, specifically for the neutral saline-spray
test, in the following way:
a) Subject the device with closed in- and outlet connection to spraying for at least 100 h, interrupt the
spraying treatment for (48 ± 1) h while maintaining the heat in the tank and resume the spraying
treatment for another (100 ± 1) h.
b) For the duration of the tests, the tank should only be opened to check and maintain the conditions,
the maximum rest period in spraying being 30 min per day. The heating should not be interrupted;
samples under test should not be handled, washed or checked.
After treatment and before visual examination, rinse the test samples in water to remove any salt residue.
4.4.3 Requirements
The device shall comply with the requirements as included in cold water pressure test (9.1.2). The results
shall not deviate by more than 10 % from the original values.
4.5 Coating adherence test (excluding cosmetic coatings)
4.5.1 General
The coating adherence test is only applicable for the valve housing and if the purpose of the coating is
corrosion protection as specified in 4.1 c).
4.5.2 Procedure
At three different locations on the coated surface cut, with a cutting tool with a tungsten carbide tip of the
type shown on Figure 2, crosses or V’s approximately 10 mm × 10 mm in length. The crosses or Vs shall
be cut by pulling the handle of the chisel parallel to the surface. The depth shall be such that they
completely cut through the electrolytic deposit, without forcing that coating into the base metal. Proceed
test according 4.4.2.
prEN 1
...