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BS EN 17821:2023

BS EN 17821:2023

$142.49

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

Published By Publication Date Number of Pages
BSI 2023 24
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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.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 European foreword
7 1 Scope
2 Normative references
8 3 Terms and definitions
4 Materials
4.1 General
9 4.2 Dezincification resistant copper alloy
4.3 Corrosion
4.3.1 General
4.3.2 Corrosion resistance test
10 5 Characteristics
5.1 Dimensions and Design
11 5.2 Protection unit against backflow
5.3 Resistance against to damage by frost
5.3.1 General
5.3.2 FRT with automatic drainage
5.3.3 FRT with controlled expansion (without drainage function)
5.4 Types of connection
5.5 General tolerances
5.5.1 Tolerance of set parameters
12 5.5.2 Accuracy of measuring instruments
6 Test methods and requirements
6.1 Determination of automatic drainage
6.1.1 General
6.1.2 Test method
6.1.3 Requirements
13 6.2 Determination of resistance against damage by frost by controlled expansion
6.2.1 General
6.2.2 Test method
6.2.3 Requirements
14 6.3 Leak tightness characteristics
6.3.1 General
6.3.2 Test methods
6.3.3 Leak tightness of the tap upstream of the obturator
6.3.4 Leak tightness of the tap downstream of the obturator
15 6.4 Bending test
6.4.1 General
6.4.2 Test method
16 6.5 Torsion strength of control elements
6.5.1 General
6.5.2 Test method
17 6.6 Mechanical endurance characteristics of the operating mechanism
6.6.1 General
6.6.2 Test method
18 6.6.3 Procedure
6.6.4 Requirement
6.7 Resistance under internal pressure
6.7.1 General
6.7.2 Principle
19 6.7.3 Apparatus
6.7.4 Mechanical behaviour upstream of the obturator — obturator in closed position
6.7.5 Mechanical behaviour downstream of the obturator — obturator in open position (Leaktightness)
20 6.8 Flow rate
6.8.1 General
6.8.2 Test methods
6.9 Acoustic behaviour
6.9.1 General
6.9.2 Procedure
6.9.3 Expression of results
6.9.4 Determination of acoustic group
21 7 Marking and technical product information
7.1 General
7.2 Marking
7.3 Technical product information
22 Annex A (informative) Tests and sampling
23 Bibliography

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BS EN 17821:2023
$142.49