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NEN-EN 1488

Building valves - Expansion groups - Tests and requirements

active, Most Current
Organization: NEN
Publication Date: 1 May 2021
Status: active
Page Count: 32
ICS Code (Water supply systems): 91.140.60
scope:

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 pressures1 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).

1 All pressures are gauge unless otherwise stated.

Document History

NEN-EN 1488
May 1, 2021
Building valves - Expansion groups - Tests and requirements
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 pressures1 from 0,1...
April 1, 2020
Building valves - Expansion groups - Tests and requirements
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 pressures1) from 0,1...
April 1, 2000
Building valves - Expansion groups - Tests and requirements
Specifies, dimensions, materials and performance requirements (including methods of test) for expansion groups, of nominal sizes from DN 15 to DN 40, having working pressures from 0,1 MPa (1 bar) to...
July 1, 1994
Building valves - Expansion group - Characteristics and tests
Specifies, dimensions, materials and performance requirements (including methods of test) for expansion groups, of nominal sizes from DN 15 to DN 40, having working pressures from 0,1 MPa (1 bar) to...

References

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