Overview

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. The use of the device specified in this European Standard does not override the need to use controls (such as thermostats and cut-outs) which act directly on the power sources of water heaters. This document has been prepared by Technical Committee CEN/TC 164 "Water supply". The responsible German body involved in its preparation is Working Committee NA 003-02-02 AA "Armaturen für die Trinkwasserinstallation in Gebäuden" ("Valves for potable water supply in buildings") at DIN.

Document: references other documents

Responsible national committee

NA 003-02-02 AA - Valves for potable water supply in buildings  

Responsible european committee

CEN/TC 164/WG 14 - Valves and fitting for buildings and devices to prevent pollution by backflow