Sieve Bed Check Valves - Sunrise Medical DeVilbiss 505DZ Service Manual

C O M P O N E N T T E S T I N G , R E P A I R & R E P L A C E M E N T
To replace pressure regulator (Figure 23):
1. Ensure the unit is unplugged from the wall outlet.
2. Remove the front and back cabinets.
3. Remove hose clamp and hose from the pressure regulator.
4. Unscrew the regulator from accumulator tank.
5. Install a new regulator on accumulator tank and attach the hose and clamp.

Sieve Bed Check Valves

Two check valves located in the manifold assembly allow oxygen to pass through the sieve beds to the accumulator tank when the
bed pressure is greater than the accumulator tank pressure. These valves also prevent reverse flow of oxygen from the accumulator
to the sieve beds.
A defective check valve will result in a decrease in oxygen concentration and lower accumulator pressures.
Figure 23
29
Accumulator tank
1/8" I.D. hose
Hose clamp
Pressure regulator