National foreword

This British Standard is the UK implementation of EN 17821:2023, incorporating corrigendum May 2024.

The UK participation in its preparation was entrusted to Technical Committee B/504/-/14, Valves and fittings for buildings & devices to prevent pollution by backflow.

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2023.

This European Standard was approved by CEN on 28 May 2023.

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, Türkiye and United Kingdom.

European foreword

This document (EN 17821:2023) 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 2024, and conflicting national standards shall be withdrawn at the latest by January 2024.

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.

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, Türkiye and the United Kingdom.

1 Scope

This document specifies:

general construction, performance and material requirements for Frost Resistant Taps for outdoor use (FRT), PN 10.
the application in the potable water installation with a static pressure of maximum 1,0 MPa (10 bar) and a distribution temperature of maximum 25 °C (PWC).

FRT valves shall consist of the 3 areas shown in Figure 1.

The conditions of use are according to the following Table 1.

The requirements with regard to the potable water quality are specified in national regulations.

2 Normative references

3 Terms and definitions

4 Materials

4.1 General

4.2 Dezincification resistant copper alloy

4.3 Corrosion

5 Characteristics

5.1 Dimensions and Design

5.2 Protection unit against backflow

5.3 Resistance against to damage by frost

5.4 Types of connection

5.5 General tolerances

6 Test methods and requirements

6.1 Determination of automatic drainage

6.2 Determination of resistance against damage by frost by controlled expansion

6.3 Leak tightness characteristics

6.4 Bending test

6.5 Torsion strength of control elements

6.6 Mechanical endurance characteristics of the operating mechanism

6.7 Resistance under internal pressure

6.8 Flow rate

6.9 Acoustic behaviour

7 Marking and technical product information

7.1 General

7.2 Marking

7.3 Technical product information

Bibliography

BS EN 17821:2023

Building valves. Frost resistant taps for outdoor use (FRT). General technical specification

Current

Published:

30 Sep 2024