prEN 1491 rev

Building valves - Expansion valves - Tests and requirements prEN 1491 rev

Scope

This document specifies dimensions, materials and performance requirements (including methods of
test) for expansion valves, of nominal sizes from DN 15 to DN 32, having working pressures1) from
0,1 MPa (l bar) to 1,0 MPa (10 bar).
Expansion valves are intended for fitting to the cold potable water supply of storage water heaters, having
a maximum distribution temperature of 95 °C, for all energy sources.
Expansion valves do not control the temperature and alone do not constitute the protection required for
storage water heaters. Expansion valves limit pressure, in the water heaters to what they are fitted, that
is produced by thermal expansion of the water.
NOTE The use of the device specified in this document does not override the need to use controls (e.g.
thermostats and cut-outs) which act directly on the power sources of water heaters (for more information see
Annex A).

Related legislation

Legislation related to this standard