Personal Ambulatory Oxygen System
Provider Technical Manual
20771733 D 31
VII. Removing/Replacing the
Proportional Flow Valve
1. Using a pair of small cutters, snip the end of the tie-wrap on the
soft tubing connecting the Proportional Valve to the Oxygen
Outlet/HEPA Filter housing and gently pull on the tubing to
disconnect the tubing from the barb fitting.
Figure 49
2. Using a pair of small cutters, snip the end of the tie-wrap on the
soft tubing connecting the aluminum tubing to the Proportional
Valve. Gently pull on the soft tubing to remove from the
Proportional Valve.
Figure 50
3. Disconnect the Proportional Valve electrical connector from the
control board.
Figure 51
4. The Proportional Valve can now be removed by gently pulling
upward. To install a new Proportional Valve, follow steps 1-3 in
reverse order.
VIII. Removing/Replacing the Rubber
Gasket Seal
1. To remove the Rubber Gasket Seal that separates the Top Cover
and Bottom Cover, gently pull upward on the gasket seal and
work free from the unit.
Figure 52
2. When removing the Rubber Gasket Seal, the square tab that
fits over the AC Power connection will have a small amount of
adhesive applied at the factory. When removing this portion, lift
up with pressure but carefully not to damage the gasket.
Note:
When reinstalling the Rubber Gasket Seal, use a small
amount of sealant on this area to prevent the seal
from breaking free.