The air vent valve is designed to be installed in heating systems in order to automatically remove air from the circuit, thus ensuring a better thermal exchange. Extraction of air from the system helps to eliminate any noise arising from imperfect circulation of the fluid medium. The air vent valve must always be installed in a vertical position in order to ensure correct operation. The plug should not to be closed completely tight, but left slightly loose in order to allow the discharge of air via an incision on the male thread. The plastic plug is provided with a sealing seat and can be closed if necessary.

If debris in the system interferes with the normal working of the valve, it is possible to unscrew and remove the cover and float. On the stem holding the float is a rubber disk, which operates as a shutter when the float lifts the stem. It is essential to check for the presence of any debris which may prevent the shutter reaching the end of its stroke. A plastic flow separator placed inside the 3/8” or 1/2” connection forces the air bubbles upwards and generates micro-currents in the fluid which ease any bubbles towards the higher side of the valve.