Brochure
Heating & Cooling
Components for today’s modern hydronic systems
AutoFill™
553/573 SERIES
AUTOMATIC FAST-FILLING VALVE
PRODUCT FEATURES
Set it and Forget it!
The CALEFFI Autofill™ is unlike traditional boiler fill valves, Autofill™ automatically and quickly fills the
system to the preset pressure and shuts off. With the optional pressure gauge the system pressure can
be viewed and adjusted as needed, no more guessing.
Automatic Fast-lling:
Fast fills the system to set pressure then
automatically shuts off the water feed. No levers
to flip or valves to close.
Built-in shut-off valve and check valve:
Allows isolation of system from supply and check
valve prevents loss of system pressure if the supply
water drops below system pressure.
Maintains stable pressure at pre-setting:
Fill the system to a set pressure and maintain
that pressure setting regardless of inlet pressure
variations.
Pre-calibration:
Before charging the system, use a screwdriver to
turn dial to intended system pressure. Downstream
pressure gauge is not required.
Anti-scale polymer materials:
Prevents scaling on internal sliding surfaces,
assuring stable pressure control and long
operating life.
Optional pre-assembly with low-lead ASSE 1012
double-check backow preventer:
Saves time and reduces space requirements.