Thrush AHF Series - Manual (Page 9)

3.1.4 Thrush Model 720 Air Eliminator
The Thrush Model 720 Air Eliminator is a unique high capacity, air elimination device. It
is designed to eliminate air as fast as it can be separated from liquid. The valve will not
open if negative pressure occurs, preventing air from being drawn back into the system.
75
8"
6"
BODY
FLOAT
VALVE TAP
1
4
" NPT
3
4
" NPT
DRAIN TAP
3
8
" NPT
LEVER ASSEMBLY
AIR COLLECTION
CHAMBER
LID
CONTROL ASSEMBLY
Figure 3-5 Air Vent
Air Eliminator Operation
The air eliminator is used on the Aar-O-Vent to remove unwanted air that could
reduce system performance, increase operational cost, and support the damaging
effects of corrosion.
The collection of air in the body of the air eliminator causes the float to drop
allowing the air to be vented through an air eliminating orifice. As the liquid level
rises in the air eliminator body, the float also rises shutting off the flow of vented
air (Figure 3-5).
Thrush Co.
Manual #9636-1230