BS EN 13434:2021 – TC:2022 Edition

$186.33

Tracked Changes. Devices to prevent pollution by backflow of potable water. Mechanical disconnector, flow actuated. Family G, Type B

Published By	Publication Date	Number of Pages
BSI	2022	78

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Categories: 23.060.50 - Check valves, BSI

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This document specifies the dimensional, physical-chemical, design, hydraulic, mechanical and acoustic characteristics of mechanical disconnectors, flow actuated Family G, Type B. This document is applicable to mechanical disconnectors flow actuated 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); — 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
48	undefined
54	1 Scope 2 Normative references
55	3 Terms and definitions
57	4 Denomination 5 Designation 6 Symbolization
58	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 7.3.2 Epoxy Coating 7.3.3 Polyamide Powder based Coating 7.3.4 Other coatings
59	8 Design 8.1 General 8.2 Relief valve/Obturator 8.2.1 General requirements 8.2.2 Mechanical Disconnector Family G, Type B
60	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 Expression of the results 9.4 Dimensional characteristics 9.4.1 Connections 9.4.2 Pressure tapping
61	9.5 Mechanical characteristics 9.5.1 General 9.5.2 Mechanical resistance of the body under pressure 9.5.2.1 Requirement 9.5.2.2 Procedure
62	9.5.3 Endurance 9.5.3.1 Requirement 9.5.3.2 Procedures
63	9.5.4 Torque test of Captive rotating Nuts and Bending Strength – Tightness of the Body 9.5.4.1 Requirement 9.5.4.2 Test method
64	9.6 Leak tightness characteristics 9.6.1 Verification of the leak tightness of the downstream check valve in closing direction 9.6.1.1 Requirement 9.6.1.2 Procedure
65	9.6.2 Verification of the leak tightness of check valve device (opening direction) 9.6.2.1 Requirement 9.6.2.2 Procedure 9.6.3 Verification of the leak tightness of the upstream spring loaded obturator in drain position at low pressure (in the opening direction) 9.6.3.1 Requirement
66	9.6.3.2 Procedure 9.7 Hydraulic characteristics 9.7.1 Test rig— General circuit
67	9.7.2 Verification of the pressure loss as a function of flow rate 9.7.2.1 Requirement 9.7.2.2 Procedure
68	9.7.3 Verification of the opening and closing pressures of relief valve 9.7.3.1 Requirement 9.7.3.2 Procedure 9.7.3.3 Closing 9.7.4 Verification of the relief valve flow rate 9.7.4.1 Requirement 9.7.4.2 Procedure
69	9.8 Compatibility with the products used for shock disinfection of the networks 9.8.1 Requirement 9.8.2 Test method 9.9 Acoustic tests 9.9.1 General 9.9.2 Procedure 9.9.2.1 Assembly of device in the test bench
70	9.9.2.2 Test method 9.9.2.3 Determination of the group 10 Order of testing
71	11 Marking and technical documents 11.1 General 11.2 Marking
72	11.3 Technical documents 12 Presentation at delivery
73	Annex A (informative)Examples of presentation of test results