SIST EN 14451:2020
(Main)Devices to prevent pollution by backflow of potable water - In-line anti-vacuum valves DN 10 to DN 50 inclusive - Family D, type A
Devices to prevent pollution by backflow of potable water - In-line anti-vacuum valves DN 10 to DN 50 inclusive - Family D, type A
This document specifies the field of application, the dimensional, the physico-chemical, the design, the hydraulic, the mechanical, and the acoustic characteristics of in-line anti vacuum valve family D Type A.
This document covers in-line anti vacuum valve family D Type A, intended to prevent pollution of potable water by backflow, caused by backsiphoning only.
It is applicable to in-line anti vacuum valve in denominations DN 10 up to DN 50.
It covers in-line anti vacuum valve of PN 10 that are capable of working without modification or adjustment:
- at any pressure, up to 1 MPa (10 bar);
- with any pressure variation, up to 1 MPa (10 bar);
- in permanent duty at a limited temperature of 65 °C and for maximum 1 h at 90 °C.
It specifies also the test methods and requirements for verifying their characteristics, the marking and the presentation at delivery.
Sicherungseinrichtungen zur Verhütung von Trinkwasserverunreinigung durch Rückfließen - Rohrleitungsbelüfter DN 10 bis einschließlich DN 50 - Familie D, Typ A
Dieses Dokument legt den Anwendungsbereich, die maßlichen, physikalisch-chemischen, Auslegungs-, hydraulischen, mechanischen und akustischen Eigenschaften der Rohrleitungsbelüfter Familie D, Typ A fest.
Dieses Dokument gilt ausschließlich für Rohrleitungsbelüfter Familie D, Typ A, die zur Verhütung von Trinkwasserverunreinigungen durch Rückfließen, verursacht durch Rücksaugen, vorgesehen sind.
Es gilt für Rohrleitungsbelüfter der Bezeichnungen DN 10 bis DN 50.
Es behandelt Rohrleitungsbelüfter mit PN 10, die ohne Abänderung oder Nachstellung funktionsfähig sind:
- bei Druckwerten, bis 1 MPa (10 bar);
- bei Druckschwankungen, bis 1 MPa (10 bar);
- im Dauerbetrieb bei einer Grenztemperatur von 65 °C und für maximal 1 h bei 90 °C.
Es legt zudem die Prüfverfahren und Anforderungen zur Verifizierung ihrer Eigenschaften, der Kennzeichnung und der Bereitstellung bei der Auslieferung fest.
Dispositifs de protection contre la pollution de l'eau potable par retour - Soupape anti-vide en ligne DN 10 à DN 50 inclus - Famille D, type A
Le présent document spécifie le domaine d’application ainsi que les caractéristiques dimensionnelles, physico-chimiques, de conception, hydrauliques, mécaniques et acoustiques des soupapes anti-vide en ligne de la famille D, type A.
Le présent document couvre uniquement les soupapes anti-vide en ligne de la famille D, type A, destinées à éviter la pollution de l’eau potable par retour, provoquée par siphonnage.
Il s’applique aux soupapes anti-vide en ligne de dénomination DN 10 à DN 50.
Il couvre les soupapes anti-vide en ligne de PN 10 qui, sans modification ni ajustement, peuvent fonctionner :
- à n’importe quelle pression, jusqu’à 1 MPa (10 bar) ;
- sous n’importe quelle variation de pression, jusqu’à 1 MPa (10 bar) ;
- de manière ininterrompue jusqu’à une température limite de 65 °C, et pendant 1 h, au maximum, à 90 °C.
Il spécifie également les méthodes d’essai et les exigences permettant de contrôler leurs caractéristiques, le marquage et la présentation à la livraison.
Naprave za varovanje pred onesnaženjem pitne vode zaradi povratnega toka - Ventili za preprečevanje podtlaka DN 10 do DN 50 - Družina D, tip A
General Information
Relations
Overview
EN 14451:2020 specifies requirements for in-line anti-vacuum valves (Family D, Type A) used to prevent pollution of potable water by backflow caused by backsiphoning. The standard applies to valves with nominal sizes DN 10 to DN 50 and pressure rating PN 10, designed to operate without adjustment at pressures up to 1 MPa (10 bar) and temperatures up to 65 °C (with a short-term limit of 90 °C for up to 1 hour). EN 14451:2020 covers design, materials, hydraulic and mechanical performance, acoustic behaviour, marking and delivery documentation, and the specified test methods to verify conformity.
Key Topics and Requirements
- Field of application: Protects potable water against backsiphoning only (no protection against backpressure).
- Size and pressure: Applicable to DN 10–DN 50; PN 10, serviceable up to 1 MPa.
- Temperature: Permanent duty up to 65 °C; maximum 1 hour at 90 °C.
- Design & materials: Specifies general design principles, connections (threads per EN 10226-1 / EN ISO 228-1), air inlet function and dezincification resistance marking (products complying with EN ISO 6509-1 may be marked “DR”).
- Performance tests: Defines a test sequence including visual verification, tightness testing, flow rate/pressure loss, bending moment/mechanical strength, endurance cycles, vacuum testing, and acoustic testing (see staged tests in the standard).
- Acoustics: Acoustic measurement and classification for DN ≤ 32 (groups I, II or nc) following EN ISO 3822 series.
- Marking & designation: Permanent marking on casing or plate; designation includes reference to EN 14451, family/type, DN, end connection, acoustic group (if applicable) and body material.
- Documentation: Technical documents and presentation at delivery requirements are specified.
Applications and Users
EN 14451:2020 is intended for:
- Manufacturers and designers of in-line anti-vacuum valves for drinking water systems.
- Test laboratories conducting type and production tests to verify hydraulic, mechanical and acoustic performance.
- Specifiers and procurement teams (water utilities, building services engineers) requiring compliant anti-vacuum valves for service connections, meter installations and inline protection against backsiphoning.
- Installers and maintenance personnel who need to select and identify correct valves by DN, thread type and acoustic classification. Note: The standard does NOT cover devices for protection against backpressure; selection must reflect site-specific backflow risk.
Related Standards
- EN 1717 - Protection against pollution of potable water by backflow (general requirements)
- EN 10226-1 / EN 10226-2, EN ISO 228-1 - Thread standards for connections
- EN ISO 3822-1 / -3 - Acoustic test methods for in-line valves
- EN ISO 5167-1 - Flow measurement principles
- EN ISO 6509-1 - Dezincification resistance (DR marking)
Keywords: EN 14451:2020, in-line anti-vacuum valve, anti-vacuum valve DN 10–DN 50, backflow prevention, potable water, PN 10, backsiphoning, acoustic classification.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2020
Nadomešča:
SIST EN 14451:2005
Naprave za varovanje pred onesnaženjem pitne vode zaradi povratnega toka -
Ventili za preprečevanje podtlaka DN 10 do DN 50 - Družina D, tip A
Devices to prevent pollution by backflow of potable water - In-line anti-vacuum valves DN
10 to DN 50 inclusive - Family D, type A
Sicherungseinrichtungen zur Verhütung von Trinkwasserverunreinigung durch
Rückfließen - Rohrleitungsbelüfter DN 10 bis einschließlich DN 50 - Familie D, Typ A
Dispositifs de protection contre la pollution de l'eau potable par retour - Soupape anti-
vide en ligne DN 10 à DN 50 inclus - Famille D, type A
Ta slovenski standard je istoveten z: EN 14451:2020
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.
EN 14451
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2020
EUROPÄISCHE NORM
ICS 13.060.20; 23.060.50 Supersedes EN 14451:2005
English Version
Devices to prevent pollution by backflow of potable water
- In-line anti-vacuum valves DN 10 to DN 50 inclusive -
Family D, type A
Dispositifs de protection contre la pollution de l'eau Sicherungseinrichtungen zur Verhütung von
potable par retour - Soupape anti-vide en ligne DN 10 à Trinkwasserverunreinigung durch Rückfließen -
DN 50 inclus - Famille D, type A Rohrleitungsbelüfter DN 10 bis einschließlich DN 50 -
Familie D, Typ A
This European Standard was approved by CEN on 24 May 2020.
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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14451:2020 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 Nominal size . 7
5 Designation. 7
6 Marking and technical documents . 8
6.1 General . 8
6.2 Marking . 8
6.3 Technical documents . 8
7 Symbolization . 9
8 General design characteristics . 9
8.1 Design principle . 9
8.2 Connections . 10
8.3 Air inlets . 10
9 Materials and surface finishes . 10
9.1 General . 10
9.2 Materials . 10
9.3 Corrosion resistance . 10
10 Characteristics and tests . 10
10.1 General . 10
10.2 Test sequence . 11
10.3 Visual verification (Stage 1) . 11
10.4 Tightness test (Stage 2) . 11
10.4.1 Test equipment . 11
10.4.2 Test . 12
10.4.3 Requirement . 12
10.5 Flow rate/pressure loss (Stage 3) . 13
10.5.1 Test equipment . 13
10.5.2 Test . 14
10.5.3 Requirement . 14
10.6 Bending moment, mechanical strength of body and leak tightness (Stage 4) . 14
10.6.1 General . 14
10.6.2 Test equipment . 15
10.6.3 Test . 15
10.6.4 Requirements . 16
10.7 Endurance test (Stage 6) . 16
10.7.1 Test procedure 1 . 16
10.7.2 Test procedure 2 . 17
10.7.3 Test procedure 3 . 19
10.8 Vacuum test (Stage 7) . 20
10.8.1 Vacuum test equipment . 20
10.8.2 Procedure . 21
10.8.3 Requirement . 21
11 Acoustic characteristics . 21
11.1 General . 21
11.2 Procedure . 21
11.2.1 Mounting and operating conditions. 21
11.2.2 Test methods . 21
11.3 Test criteria . 21
11.3.1 Expression of the results . 21
11.3.2 Noise classification . 21
Annex A (informative) Sampling and test sequence . 22
European foreword
This document (EN 14451:2020) has been prepared by Technical Committee CEN/TC 164 “Water
supply”, the secretariat of which is held by AFNOR.
This document shall be given the status of a national standard, either by publication of an identical text
or by endorsement, at the latest by December 2020, and conflicting national standards shall be
withdrawn at the latest by December 2020.
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 14451:2005.
In comparison with the previous edition, the following changes have been made:
a) title changed;
b) scope of application revised;
c) Clause 2 updated;
d) nominal size range in Clause 4 restricted;
e) Clause 9 adapted.
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 organisations of the
following countries are bound to implement this document: 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
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) note 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 the field of application, the dimensional, the physico-chemical, the design, the
hydraulic, the mechanical, and the acoustic characteristics of in-line anti vacuum valve family D Type A.
This document covers in-line anti vacuum valve family D Type A, intended to prevent pollution of
potable water by backflow, caused by backsiphoning only.
It is applicable to in-line anti vacuum valve in denominations DN 10 up to DN 50.
It covers in-line anti vacuum valve of PN 10 that are capable of working without modification or
adjustment:
— at any pressure, up to 1 MPa (10 bar);
— with any pressure variation, up to 1 MPa (10 bar);
— in permanent duty at a limited temperature of 65 °C and for maximum 1 h at 90 °C.
It specifies also the test methods and requirements for verifying their characteristics, the marking and
the presentation at delivery.
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 248, Sanitary tapware - General specification for electrodeposited coatings of Ni-Cr
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 10226-2, Pipe threads where pressure tight joints are made on the threads - Part 2: Taper external
threads and taper internal threads - Dimensions, tolerances and designation
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 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)
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)
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)
EN ISO 6509-1, Corrosion of metals and alloys - Determination of dezincification resistance of copper
alloys with zinc - Part 1: Test method (ISO 6509-1)
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 http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
in-line anti-vacuum valve
mechanical device with an air inlet which is closed when water flows through it at or above
atmospheric pressure, 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
Note 1 to entry: In case of subatmospheric pressure the obturator should admit air to the downstream
pipework as well as throttling the inlet waterway of the device.
Note 2 to entry: It ensures no protection
...
Frequently Asked Questions
SIST EN 14451:2020 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Devices to prevent pollution by backflow of potable water - In-line anti-vacuum valves DN 10 to DN 50 inclusive - Family D, type A". This standard covers: This document specifies the field of application, the dimensional, the physico-chemical, the design, the hydraulic, the mechanical, and the acoustic characteristics of in-line anti vacuum valve family D Type A. This document covers in-line anti vacuum valve family D Type A, intended to prevent pollution of potable water by backflow, caused by backsiphoning only. It is applicable to in-line anti vacuum valve in denominations DN 10 up to DN 50. It covers in-line anti vacuum valve of PN 10 that are capable of working without modification or adjustment: - at any pressure, up to 1 MPa (10 bar); - with any pressure variation, up to 1 MPa (10 bar); - in permanent duty at a limited temperature of 65 °C and for maximum 1 h at 90 °C. It specifies also the test methods and requirements for verifying their characteristics, the marking and the presentation at delivery.
This document specifies the field of application, the dimensional, the physico-chemical, the design, the hydraulic, the mechanical, and the acoustic characteristics of in-line anti vacuum valve family D Type A. This document covers in-line anti vacuum valve family D Type A, intended to prevent pollution of potable water by backflow, caused by backsiphoning only. It is applicable to in-line anti vacuum valve in denominations DN 10 up to DN 50. It covers in-line anti vacuum valve of PN 10 that are capable of working without modification or adjustment: - at any pressure, up to 1 MPa (10 bar); - with any pressure variation, up to 1 MPa (10 bar); - in permanent duty at a limited temperature of 65 °C and for maximum 1 h at 90 °C. It specifies also the test methods and requirements for verifying their characteristics, the marking and the presentation at delivery.
SIST EN 14451:2020 is classified under the following ICS (International Classification for Standards) categories: 13.060.20 - Drinking water; 23.060.50 - Check valves; 91.140.60 - Water supply systems. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 14451:2020 has the following relationships with other standards: It is inter standard links to SIST EN 14451:2005. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 14451:2020 is associated with the following European legislation: EU Directives/Regulations: 305/2011. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
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