BS EN 1488:2021 – TC

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Tracked Changes. Building valves. Expansion groups. Tests and requirements

Published By	Publication Date	Number of Pages
BSI	2021	78

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Categories: 91.140.65 - Water heating equipment, BSI

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Description

This document specifies, dimensions, materials and performance requirements (including methods of test) for expansion groups, of nominal sizes from DN 15 to DN 25, having working pressures from 0,1 MPa (1 bar) to 1,0 MPa (10 bar). Expansion groups are fitted to the cold potable water supply only for expansion purposes, e.g. of storage water heaters, having a maximum distribution temperature of 95 °C. Expansion groups limit pressure in the water heater to which they are fitted, that is produced by thermal expansion of the water, prevent the backflow of water into the supply pipe and prevent the discharged water to get into contact with the water in the water heater. Expansion groups do not control temperature and alone do not constitute the protection required for storage water heaters. NOTE The use of the device specified in this document does not override the need to use controls (e.g. thermostats and thermal cut-outs) which act directly on the power sources of water heaters (for more information see Annex A).

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PDF Pages	PDF Title
48	undefined
54	1 Scope 2 Normative references
55	3 Terms and definitions
57	4 Materials and surface finishes 4.1 General
58	4.2 Materials 4.3 Detection of residual stress 4.3.1 General 4.3.2 Test 4.3.3 Test method (Procedure)
59	4.3.4 Requirements 4.4 Corrosion resistance test 4.4.1 General 4.4.2 Test method 4.4.3 Requirements
60	4.5 Coating adherence test 4.5.1 General 4.5.2 Test method 4.5.3 Requirements 4.6 Compatibility with the products used for shock disinfection of the networks 4.6.1 General 4.6.2 Test method
61	4.6.3 Requirements 5 Design and dimensional requirements 5.1 General guidance
62	5.2 Dimensional characteristics 5.3 Test port and pressure measuring port 5.4 Expansion valve outlet connection to air break to drain 5.5 Expansion valve discharge connection to drain device 5.6 Connections 5.7 Replacing of the expansion valve
63	5.8 Check valve 6 Apparatus 6.1 General 6.2 Tolerances of parameters and accuracy of measure instruments 6.2.1 Tolerances on set parameters 6.2.2 Accuracy of measuring instruments 6.2.3 Test media 7 Hydraulic tests and requirements 7.1 Flow rate test 7.1.1 Procedure 7.1.2 Requirement
64	7.2 Tightness test 7.2.1 General 7.2.2 Tightness test for the isolating valve at a pressure of 1,6 MPa (16 bar) 7.2.2.1 Procedure 7.2.2.2 Requirement 7.2.3 Expansion group tightness test 7.2.3.1 Procedure 7.2.3.2 Requirement 8 Mechanical tests and requirements 8.1 Mechanical strength 8.1.1 Pressure test of the body of the expansion group 8.1.1.1 Procedure 8.1.1.2 Requirement
65	8.1.2 Bending moment test 8.1.2.1 General 8.1.2.2 Procedure
66	8.1.2.3 Requirement 8.2 Mechanical strength of the easing gear of the expansion valve 8.2.1 Procedure 8.2.2 Requirement 8.3 Torsional strength of the expansion group’s body 8.3.1 General 8.3.2 Procedure
67	8.3.3 Requirement 8.4 Torque test of the captive rotating nuts/tail pieces 8.4.1 General 8.4.2 Procedure 8.4.3 Requirement
68	9 Tests and requirements of the components of the expansion group 9.1 Isolating valve 9.1.1 General 9.1.2 General requirements 9.1.3 Test of manual operation 9.1.3.1 Procedure 9.1.3.2 Requirement 9.1.4 Endurance test 9.1.4.1 Procedure 9.1.4.2 Requirement
69	9.2 Tightness between check valve and group’s body 9.2.1 General 9.2.2 Verification of the leak tightness between the group’s body and the check valve at low pressure 9.2.2.1 Test method 9.2.2.2 Requirement 9.2.3 Verification of the leak tightness between the group’s body and the check valve under high pressure 9.2.3.1 Test method 9.2.3.2 Requirement 9.3 Expansion valve 9.3.1 Pressures 9.3.1.1 General 9.3.1.2 Nominal set pressure (Pnr) 9.3.1.3 Water tightness pressure (Pe) 9.3.1.4 Rating pressure (Pdn)
70	9.3.1.5 Closing pressure (Pf) 9.3.1.6 Initial opening pressure (Pdc) 9.3.1.7 Opening pressure (Po) 9.3.2 Cold water pressure tests 9.3.2.1 General 9.3.2.2 Water tightness pressure (Pe) test
71	9.4 Endurance test 9.4.1 Procedure 9.4.2 Requirement
72	9.5 Easing gear (manual control device) 9.5.1 Operation of the easing gear 9.5.1.1 Procedure 9.5.1.2 Requirement 9.5.2 Easing gear endurance test 9.5.2.1 Procedure 9.5.2.2 Requirement 9.6 Air break to drain 10 Acoustic tests and requirements
73	11 Classification 12 Designation
74	13 Marking 14 Technical documents and presentation at delivery
75	Annex A (informative)Classification of water heaters according to heating method A.1 Indirect Heating A.2 Classification of water heaters according to heating method A.2.1 Indirect heating
76	A.3 Direct Heating

Additional information

Status	Definitive
Pages	78
Publication Date	2021-10-07
ISBN	978 0 539 19215 5
Standard Number	BS EN 1488:2021 – TC
Title	Tracked Changes. Building valves. Expansion groups. Tests and requirements
Descriptors	Building services, Water heaters, Flow rates, Cold-water supply systems, Performance, Safety valves, Mechanical testing, Hydraulic tests, Pressure regulators, Safety devices, Thermal expansion, Water supply (buildings), Pressure control, Preferred sizes, Storage water heaters, Dimensions, Check valves, Valves
Publisher	BSI
Committee	B/504
ICS Codes	91.140.65 - Water heating equipment

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BS EN 1488:2021 – TC

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