The Amtrol Model 747 High Capacity Air Vent is designed for use in liquid systems to purge undesirable free air that otherwise could impede system performance, increase system operating cost and contribute to the damaging effects of corrosion.  The accumulation of air in the body of the Model 747 High Capacity Air vent causes a float to drop allowing he air to be vented through an air eliminating orifice.  As the liquid level rises in the vent body, the float also rises shutting of the flow of venting gases.

			AIR PURGER
The water that is used initially to fill a hot water heating system contains dissolved air. Make-up water subsequent added will similarly have a high air content. Heating this water releases the air and permits it to be circulated in the system, for which it must be vented. The purpose of the Air Purges is to continuously separate and collect any air from the water as i t circulates so that it may be vented automatically by afloat air vent without the necessity for frequent manual venting.					Submittal Data(pdf) Back to Home Page