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BS EN 13433:2021:2022 Edition

BS EN 13433:2021:2022 Edition

$142.49

Devices to prevent pollution by backflow of potable water. Mechanical disconnector, direct actuated. Family G, type A

Published By Publication Date Number of Pages
BSI 2022 32
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This document specifies the dimensional, physical-chemical, design, hydraulic, mechanical and acoustic characteristics of mechanical disconnectors, direct actuated Family G, Type A. This document is applicable to mechanical disconnectors in nominal sizes DN 8 up to DN 250, intended to prevent the return of water having lost its original sanitary and drinking qualities (called “polluted water” in this document), into the potable water distribution system whenever the pressure of the latter is temporarily lower than in the polluted circuit. This document covers the mechanical disconnectors of PN 10 that are capable of working without modification or adjustment: — at any pressure up to 1,0 MPa (10 bar); — with any pressure variation up to 1,0 MPa (10 bar); — in permanent duty at a limit temperature of 65 °C and 90 °C for 1 h maximum. It specifies also the test methods and requirements for verifying these characteristics, the marking and the presentation at delivery.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 1 Scope
2 Normative references
9 3 Terms and definitions
11 4 Denomination
5 Designation
6 Symbolization
12 7 Physical-chemical characteristics
7.1 General
7.2 Materials
7.2.1 General
7.2.2 Dezincification resistant copper alloy
7.3 Surface of the body
7.3.1 General
13 7.3.2 Epoxy Coating
7.3.3 Polyamide Powder based Coating
8 Design
8.1 General
8.2 Relief valve/Obturator
8.2.1 General
14 8.2.2 Mechanical Disconnector Family G, Type A
8.3 Disconnection distance
9 Characteristics and tests
9.1 General
9.2 General tolerances
9.2.1 Tolerance of set parameters
9.2.2 Accuracy of measuring instruments
9.3 Dimensional characteristics
9.3.1 Connections
9.3.2 Pressure taps
15 9.4 Mechanical characteristics
9.4.1 General
9.4.2 Mechanical resistance of the body under pressure
9.4.2.1 Requirement
9.4.2.2 Procedure
16 9.4.3 Endurance
9.4.3.1 Requirement
9.4.3.2 Procedures
17 9.4.4 Torque test of Captive rotating Nuts and Bending Strength – Tightness of the Body
9.4.4.1 Requirement
9.4.4.2 Test method
18 9.5 Leak tightness characteristics
9.5.1 Verification of the leak tightness of the downstream check valve in closing direction
9.5.1.1 Requirement
9.5.1.2 Procedure
9.5.2 Verification of the leak tightness of check valve device (opening direction)
9.5.2.1 Requirement
19 9.5.2.2 Procedure
9.5.3 Verification of the leak tightness of the upstream spring loaded obturator in drain position at low pressure (in the opening direction)
9.5.3.1 Requirement
9.5.3.2 Procedure
20 9.6 Hydraulic characteristics
9.6.1 Test rig – General circuit
21 9.6.2 Verification of the pressure loss as a function of flow rate
9.6.2.1 Requirement
9.6.2.2 Procedure
22 9.6.3 Verification of the opening and closing pressures of relief valve
9.6.3.1 Requirement
9.6.3.2 Procedure
9.6.3.3 Closing
9.6.4 Verification of the relief valve flow rate
9.6.4.1 Requirement
9.6.4.2 Procedure
23 9.6.5 Compatibility with the products used for disinfection of water distribution systems
9.6.5.1 Requirement
9.6.5.2 Procedure
9.6.6 Acoustic tests
9.6.6.1 General
9.6.6.2 Procedure
24 10 Order of testing
25 11 Marking and technical documents
11.1 General
11.2 Marking
26 11.3 Technical documents
12 Presentation at delivery
27 Annex A (informative)Examples of presentation of test results

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BS EN 13433:2021
$142.49