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 filling 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-off phase, the water feed will stop when the set pressure is reached.  A pre-assembled version is also available, complete with upstream backflow preventer.
 
 
 
 
 
 
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