EN 14451:2005

SLOVENSKI STANDARD
01-september-2005
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Devices to prevent pollution by backflow of potable water - In-line anti-vacuum valves DN
8 to DN 80 - Family D, type A
Sicherungseinrichtungen zum Schutz des Trinkwassers gegen Verschmutzung durch
Rückfließen - Rohrbelüfter DN 8 bis DN 80 - Familie D, Typ A
Dispositifs de protection contre la pollution de l'eau potable par retour - Soupape anti-
vide en ligne DN 8 a DN 80 - Famille D, Type A
Ta slovenski standard je istoveten z: EN 14451:2005
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 14451
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2005
ICS 13.060.20; 23.060.50
English version
Devices to prevent pollution by backflow of potable water - In-
line anti-vacuum valves DN 8 to DN 80 - Family D, type A
Dispositifs de protection contre la pollution de l'eau potable Sicherungseinrichtungen zum Schutz des Trinkwassers
par retour - Soupape anti-vide en ligne DN 8 à DN 80 - gegen Verschmutzung durch Rückfließen - Rohrbelüfter DN
Famille D, type A 8 bis DN 80 - Familie D, Typ A
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 14451:2005: 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 size .6
5 Designation .6
6 Marking and technical documents.6
7 Symbolization.8
8 General design characteristics .8
9 Physico-chemical characteristics.9
10 Characteristics and tests .10
11 Acoustic characteristics .19
Annex A (normative) Sampling and test sequence.21

Foreword
This document (EN 14451:2005) 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 developed with reference to 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 in line anti-vacuum valves;
c) dimensional, the physico-chemical properties and the properties of general hydraulic, mechanical and
acoustic design of in-line anti-vacuum valves DN 8 to DN 80;
d) test method and requirements for verifying these properties;
e) marking and presentation;
f) acoustics.
This document specifies the characteristics of in-line anti-vacuum valves DN 8 to DN 80 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, Specifications 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.
in-line anti-vacuum valve
mechanical device with an air inlet which is closed when water flows through it at or above atmospheric pres-
sure, but which opens to admit air if there is a subatmospheric pressure at the water inlet or when the flow
stops, and closes so as to be watertight when the flow of water is resumed at normal pressure. In case of
subatmospheric pressure the obturator should admit air to the downstream pipework as well as throttling the
inlet waterway of the device. It ensures no protection against back flow by back pressure. For the purpose of
this document "in-line-anti-vacuum valve(s) DA" is hereafter referred to as “device(s)”
4 Nominal size
The nominal size (DN) of the device shall correspond to the denomination of the thread according to Table 1.
For the specification of threads see 8.2.
Table 1 — Nominal size vs thread size
DN 8 10 15 20 25 32 40 50 65 80
Thread size ¼ ⁄ ½ ¾ 1 1 ¼ 1 ½ 2 2 ½ 3
5 Designation
The devices are designated by:
a) name;
b) reference to this document (EN 14451);
c) family, type;
d) nominal size (DN);
e) body material;
f) acoustic group (≤ DN 32 only).
Example of designation:
In-line antivacuum valve, EN 14451,family D, type A, 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
dezincification 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
products, 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 are to be
indelible 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 (≤ DN 32 only);
e) letters indicating family and type of device;
f) nominal pressure (PN);
g) conformance with this document (EN 14451);
h) maximum operating temperature °C.
Marking a), b), c), and e) 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.
g)
7 Symbolization
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 DA device is given in Figure 2.

Key
1 Air inlet
2 Seal
3 Floating disk
4 Water inlet
5 Water outlet
6 Vacuum back siphonage condition
7 Zero flow
Figure 2 — Design principle of DA in-line anti-vacuum valve
8.2 Connections
End connections shall comply with ISO 7-1 or EN ISO 228-1.
8.3 Air inlets
Air inlets shall be shrouded and designed to ensure that they cannot easily be blocked by deposits.
Dimensions of external air inlets shall be minimum 4 mm (see Figure 2).
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:
 water distributed;
 fluids or matter liable to come into contact with them;
 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 dezincification when submitted to water
capable of dezincification. In countries where the use of products made of dezincification resistant materials is
required, the products shall guarantee a dezincification depth less than 200 um in any direction, they shall be
tested in accordance with EN ISO 6509 and shall be marked in compliance with the indications in Clause 6.
b) Neither the materials nor coatings used shal
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