BIRD MARK 7 - Page 10

PNEUMATIC
SYSTEMS
SECTION
4:
PNEUMATIC SYSTEMS
tional range, the relief valve opens and vents the
excess pressures above preset to ambient.
Each valve has a specific range, calibrated at the
factory, depending upon the requirements of the
equipmeni. Pressures can be adjusted in accor
dance to each individual need (Fig. 19).
FIGURE 16
FIGURE 19
FIGURE 17 B FIXED ORIFICE
In selected situations, there is a need to perma-
E AMBIENT FILTER nently meter gas flows at a specified rate. The
| FIXED ORIFICE adjusts that flow of gas based
the entrainment of foreign materia tom te room UPON the racius and length ofthe orice itself. This
into the respirator/ventilator The external filter is 00006 may pe found node e coupling or within
easily removed for cleaning. By utilizing a Phillips) S tubing of the ventilator (Fig. 20).
screwdriver, the nylon filter screen may be
removed, cleaned, sterilized and replaced as
needed (Fig. 18).
FIGURE 20
@ QUICK DISCONNECT SYSTEM
The QUICK DISCONNECT SYSTEM allows bio-
medical personnel to perform routine maintenance
with a maximum of ease and yet provide secure,
leak-proof junctions capable of withstanding the
required internal pressures.
The system employs a series of bayonet tapers
that friction lock in their receptacles (Fig. 21).
These connectors, when properly used, prevent
inadvertent disengagement. The quick disconnect
B PRESSURE RELIEF VALVE system has successfully been tested at 200 psig.
The PRESSURE RELIEF VALVE is utilized in
breathing circuits to limit peak pressures or, to
assist in the prevention of excessively high pres-
sure situations from being transferred to the
patient's airways. As pressures within the ventilator
or breathing circuit rise to the preset operational
FIGURE 18
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