Caleffi Series 5080 is a Radiator air vent valve designed to remove automatically any air trapped inside the heat emitters both during the filling of the system and in normal operation. The 5080 can be used manually or automatically. The automatic discharge is based on the property of the cellulose fibre discs forming the seal cartridge.
Manual Discharge
The manual discharge position is achieved by unscrewing the knob approx. one turn. Typical use of this method is when refilling the system.
Automatic Discharge
The automatic discharge position is achieved with the knob fully closed.
The hygroscopic discs increase their volume by 50% when they are immersed in water. In this way, when the system is operating under normal conditions, the discs are immersed and, thanks to their increase in volume, they close the valve. However, when air is present, the discs dry out and allow the air to vent. The hygroscopic discs close very quickly, in just a few seconds. The drying times are such that there are no problems with the cycle of formation and elimination of air.
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