EN 14452:2005

SLOVENSKI STANDARD
01-september-2005
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Devices to prevent pollution by backflow of potable water - Pipe interrupter with
atmospheric vent and moving element DN 10 to DN 20 - Family D, type B
Sicherungseinrichtungen zum Schutz des Trinkwassers gegen Verschmutzung durch
Rückfließen - Rohrunterbrecher mit Lufteintrittsöffnung und beweglichem Teil, DN 10 bis
DN 20 - Familie D, Typ B
Dispositifs de protection contre la pollution de l'eau potable par retour - Rupteur a évent
atmosphérique avec élément mobile DN 10 a DN 20 - Famille D, type B
Ta slovenski standard je istoveten z: EN 14452:2005
ICS:
13.060.20 Pitna voda Drinking water
23.060.50 Blokirni ventili Check valves
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.

EUROPEAN STANDARD
EN 14452
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2005
ICS 13.060.20; 23.060.50
English version
Devices to prevent pollution by backflow of potable water - Pipe
interrupter with atmospheric vent and moving element DN 10 to
DN 20 - Family D, type B
Dispositifs de protection contre la pollution de l'eau potable Sicherungseinrichtungen zum Schutz des Trinkwassers
par retour - Rupteur à évent atmosphérique avec élément gegen Verschmutzung durch Rückfließen -
mobile DN 10 à DN 20 - Famille D, type B Rohrunterbrecher mit Lufteintrittsöffnung und beweglichem
Teil, DN 10 bis DN 20 - Familie D, Typ B
This European Standard was approved by CEN on 24 December 2004.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14452:2005: E
worldwide for CEN national Members.

Contents Page
Foreword.3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .6
4 Nominal sizes.6
5 Designation .6
6 Marking and technical documents.7
7 Symbolisation .8
8 General design characteristics .8
9 Physico-chemical characteristics.9
10 Characteristics and tests .9
11 Acoustic characteristics .15
Annex A (normative) Sampling and test sequence.16

Foreword
This document (EN 14452:2005) 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 November 2005, and conflicting national standards shall be withdrawn
at the latest by November 2005.
This document has been worked out in reference with EN 1717 "Protection against pollution of potable water
in water installations and general requirements of devices to prevent pollution by backflow".
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Den-
mark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxem-
bourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and
United Kingdom.
Introduction
In respect of potential adverse effects 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, while 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:
a) field of application;
b) requirements for pipe interrupters with atmospheric vent and moving element;
c) dimensional and the physico-chemical properties, and the properties of general hydraulic, mechanical
and acoustic design of pipe interrupters with elastic membrane of DN 10 to DN 20;
d) test procedure and requirements for verifying these properties;
e) marking and presentation;
f) acoustics.
This document specifies the characteristics of pipe interrupters with atmospheric vent and moving element,
DN 10 to DN 20 that are suitable for use in drinking water systems at pressures up to 1 MPa (10 bar) and
temperatures up to 65 °C and for 1 h at 90 °C.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated refer-
ences, only the edition cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies.
EN 806-1:2000, Specification for installations inside buildings conveying water for human consumption —
Part 1: General
EN 1717:2000, Protection against pollution of potable water in water installations and general requirements of
devices to prevent pollution by backflow
EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation (ISO 228-1:2000)
EN ISO 3822-1, Acoustics — Laboratory tests on noise emission from appliances and equipment used in
water supply installations — Part 1: Method of measurement (ISO 3822-1:1999)
EN ISO 3822-3, Acoustics — Laboratory tests on noise emission from appliances and equipment used in
water supply installations — Part 3: Mounting and operating conditions for in-line valves and appliances
(ISO 3822−3:1997)
EN ISO 3822-4, Acoustics — Laboratory tests on noise emission from appliances and equipment used in
water supply installations — Part 4: Mounting and operating conditions for special appliances (ISO 3822-
4:1997)
EN ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-
section conduits running full - Part 1: General principles and requirements (ISO 5167-1:2003)
EN ISO 6509, Corrosion of metals and alloys — Determination of dezincification resistance of brass
(ISO 6509:1981)
ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1717:2000, EN 806-1:2000 and the
following apply.
pipe interrupter with atmospheric vent and moving element
pipe interrupter with elastic membrane, fitted with air inlet port(s) which is (are) closed, when water flows
through it above atmospheric pressure, but which opens (open) to admit air if there is a subatmospheric pres-
sure at the water inlet or when the flow stops, and close to be watertight when the flow of water is resumed at
normal pressure. It ensures protection against back siphonage only by draining to the atmosphere, but not
against back pressure. Direction of water flow is vertically downwards.
For the purpose of this document “pipe interrupter with atmospheric vent and moving element DB” is hereafter
referred to as "device(s)"
4 Nominal size
The nominal size of the device shall correspond to the denomination of the thread according to Table 1,
EN ISO 228-1 or ISO 7-1.
Table 1 — Nominal size vs union end thread size
DN 10 15 20
Thread size
⁄ ½ ¾
5 Designation
The devices are designated by:
a) name;
b) reference to this document (EN 14452);
c) family, type;
d) nominal size (DN);
e) body material;
f) acoustic group.
Example of designation:
Pipe interrupter EN 14452, family D, type B, DN 20, gun metal, Ι.
6 Marking and technical documents
6.1 General
In countries where the use of products made of dezincification resistant materials is not required, the dezincifi-
cation resistant products according to EN ISO 6509, as well as the products which do not contain zinc, may be
marked "DR".
In countries where the use of dezincification resistant materials is required, the dezincification resistant prod-
ucts, as well as the products which do not contain zinc, shall be marked "DR".
6.2 Marking
The devices shall be marked permanently and visibly on the casing, or on a fixed data plate.
This information shall be on the upper side, or on each lateral side of the device. The indications shall be in-
delible and obtained by moulding, engraving or similar procedures.
The marking shall indicate:
a) name, manufacturer's brand or logo;
b) arrow indicating normal direction of flow;
c) nominal size (DN);
d) acoustic group;
Marking a), b), c), are obligatory. In case there is no marking for d), the device shall be considered as not
classified acoustically.
6.3 Technical documents
Each package and/or each batch and/or each catalogue of the supplier/manufacturer shall contain technical
product information which shall be written in a commonly spoken language of the country in which the product
is sold.
It shall provide the following information:
a) designation and purpose of the product;
b) installation instructions;
c) minimum installation height;
d) (brand) name and address of supplier/manufacturer;
e) instructions for maintenance, if any;
f) spare part list, if any.
7 Symbolisation
The graphic representation of the device is as follows (see Figure 1).

Figure 1 — Graphic symbol
8 General design characteristics
8.1 Design principle
A typical design principle of DB device is given in Figure 2.
Dimensions in millimetres
Key
1 Vacuum back siphonage condition
2 Air
3 Water inlet
4 Slit of the support part
5 Water outlet
6 Cut off line for 10.10 vacuum test
7 Membrane
Figure 2 — Design principle
8.2 Connections
Connections shall comply with EN ISO 228 or ISO 7-1.
8.3 Replacement of internal parts
Internal parts of devices have to be designed so that replacement can be carried out easily.
9 Physico-chemical characteristics
9.1 Materials
The materials and the coatings used, liable to come normally or accidentally in contact with potable water,
shall satisfy the EU regulations concerning water quality.
The materials and the coatings shall be:
a) corrosion resistant in accordance with ISO 9227;
b) prone to the least scaling possible;
c) in conformity with the associated standards and regulations;
d) compatible among themselves and with:
 the water distributed;
 the fluids or matter liable to come into contact with them;
 the products normally used for disinfection operations of the network: potassium permanganate and
sodium hypochlorite.
9.2 Nature of materials
The choice of materials is left to the discretion of the manufacturer;
a) Copper-zinc alloys containing more than 10 % zinc are subject to denzincification when submitted to
water capable of dezincification. In the countries where the use of products made of dezincification
resistant materials is required, the products shall guarantee a dezincification depth less than 200 µm in
any direction, they shall be tested in accordance with EN ISO 6509 and shal
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