Safety group, for closed drinking water heater, has connection for membrane expansion vessel between input and output blocking valves

摘要

The safety group has an input blocking valve (1), a test terminal (2) for a non-return device (3), the non-return device, an output blocking valve (4), a membrane safety valve (5) and a connection for fitting to a membrane expansion vessel. The safety group is contained within a U-shaped housing perpendicular to the axis of the water feed line, with the connection for the membrane expansion vessel provided between the input blocking valve and the output blocking valve and selectively closed by a threaded stop.