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BS EN 1488:2021

BS EN 1488:2021

$142.49

Building valves. Expansion groups. Tests and requirements

Published By Publication Date Number of Pages
BSI 2021 32
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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).

PDF Catalog

PDF Pages PDF Title
2 undefined
8 1 Scope
2 Normative references
9 3 Terms and definitions
11 4 Materials and surface finishes
4.1 General
12 4.2 Materials
4.3 Detection of residual stress
4.3.1 General
4.3.2 Test
4.3.3 Test method (Procedure)
13 4.3.4 Requirements
4.4 Corrosion resistance test
4.4.1 General
4.4.2 Test method
4.4.3 Requirements
14 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
15 4.6.3 Requirements
5 Design and dimensional requirements
5.1 General guidance
16 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
17 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
18 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
19 8.1.2 Bending moment test
8.1.2.1 General
8.1.2.2 Procedure
20 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
21 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
22 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
23 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)
24 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
25 9.4 Endurance test
9.4.1 Procedure
9.4.2 Requirement
26 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
27 11 Classification
12 Designation
28 13 Marking
14 Technical documents and presentation at delivery
29 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
30 A.3 Direct Heating

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BS EN 1488:2021
$142.49