EN 1487:2014

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Materials and surface finishes
5 Design and dimensional requirements
6 Apparatus
7 Hydraulic tests and requirements
8 Mechanical tests and requirements
9 Tests and requirements of the components
   of the hydraulic safety group
10 Resistance to thermal shocks
11 Acoustic tests and requirements
12 Classification
13 Designation
14 Marking
15 Technical documents and presentation
   at delivery
Annex A (informative) - Test sequences

This European Standard specifies dimensions, materials and performance requirements (including methods of test) for hydraulic safety groups, of nominal sizes from DN 15 to DN 25, having working pressures ) from 0,1 MPa (1 bar) to 0,7 MPa (7 bar). Hydraulic safety groups are intended for fitting to the potable water supply of storage water heaters, having a maximum storage temperature of 95°C.Hydraulic safety groups limit the pressure in hot water heaters, prevent the backflow of water into the main circuit and prevent the discharged water to get into contact with the water in the water heater.Hydraulic safety groups do not control the temperature. They ensure the hydraulic safety of water heaters if the mechanical resistance of the water heater remains at least equal to the rating pressure.NOTEThe use of the device specified in this European Standard does not override the need to use controls (e.g. thermostats and cut-outs) which act directly on the power sources of water heaters.