Theory of operation
2-12
10070389 Rev. A
Puritan Bennett™ 700 Series Ventilator System Service Manual
2.2.1.2 System operation
During piston retraction, oxygen and/or room air are drawn into the cylinder. If oxygen
enrichment is selected, oxygen from an external source is regulated, then supplied by either
the low- or high-flow solenoid/orifice. Room air to be used in the mixture is drawn in through
the air intake filter. The gases pass through the mixing manifold, which dampens the sound
of the gases. The gas displaced by piston movement is vented through the air intake filter
also.
During gas delivery, the oxygen system is pressurized, but there is no flow, as the oxygen
solenoids are de-energized (closed).
Figure 2-5. Gas inlet system components (1 of 2)
Air intake filter assembly
Manifold
Filter
Cover
7-00264
Air intake check valve
(blue housing)
Pressure relief check
valve (white housing)
Oxygen fitting
7-00026
Oxygen hose assembly
7-00027
Summary of Contents for Puritan Bennett 700 Series
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