The automatic filling unit is a device consisting of a pressure reducing valve with
compensating seat, an inlet filter, a shut-off valve and a check valve. It is installed on
the water inlet piping in sealed heating systems, and its main function is to maintain
the pressure of the system stable at a set value, automatically topping up with water as
required.

This product has the characteristic of being pre-adjustable, which means that it can be
adjusted at the required pressure value before the system charging phase.
After installation, during the filling or topping-up phase, the water feed will stop when the
set pressure is reached.

A pre-assembled version is also available, complete with upstream backflow preventer
and shut-off valve.