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GAS DELIVERY SYSTEM (continued)
A sintered bronze filter within each yoke
prevents foreign material from entering
the internal gas piping of the NARKOMED
3. A check valve in each yoke prevents
back flow into the cylinder or leakage into
the atmosphere if the cylinder is not
mounted on the yoke.
When the machine is configured with two
yokes for the same gas, the check valve
prevents migration of gas from one
cylinder to another. If a cylinder is not
mounted to a yoke, the attached yoke plug
should be placed between the yoke handle's
threaded bolt and the yoke's gas inlet.
When attaching a cylinder, ensure only one
washer is installed between the cylinder
and the yoke gas inlet.
multiple washers may compromise the Pin
Index Safety System. The integrity of both
index pins must be verified whenever a
new
cylinder
is
attached to the hanger yokes must contain
gas at the recommended pressures outlined
in the table below.
RECOMMENDED RESERVE CYLINDER
MAXIMUM PRESSURES
GAS
Air
Carbon Dioxide
Oxygen-Helium
Nitrous Oxide
Oxygen
6
The use of
installed.
Cylinders
MAX PSI
2200
830
2400
745
2200
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Pressure Regulators
Each cylinder gas circuit incorporates a
pressure regulator that reduces the gas
pressure. These regulators are preset
below the commonly used hospital pipeline
pressure of 50-55 psi to ensure that gas
will be supplied from the pipeline and not
the cylinder if both sources of supply are
open. Pressure relief valves, integral to the
regulator, prevent excessive pressure in
case of regulator failure or excessive
pipeline pressure.
NOTE: Canadian machines are equipped
with an additional pipeline overpressure
relief valve that is set to open at 75 psi
(520 kPa).
Cylinder Pressure Gauges
Each
cylinder
gas
NARKOMED 3 is provided with a cylinder
pressure gauge, located at the bottom of
the flowmeter panel on the front of the
machine (Figures 5, 6, & 7). Each gauge is
labeled and color-coded for its respective
gas.
When a cylinder's valve is open, its
pressure gauge indicates the gas pressure
in the cylinder. The dial is marked with
concentric scales in psi and kPa.
circuit
on
the
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