MIL-PRF-83178C
3.6.1 Air mixing port. An air mixing port shall be provided to mix varying quantities of
ambient air with oxygen in specified ratios. A filter equivalent to a mesh screen within a range of
30 to100 mesh, shall be provided to prevent foreign particles from entering the regulator.
3.6.2 Oxygen inlet filter. A 30 micron filter shall be provided at the regulator inlet.
3.6.3 Pressure relief device. A replaceable pressure relief device shall be provided to
vent excess outlet pressure through the body of the regulator to the atmosphere. The device shall
vent 45 liters per minute (LPM) at a pressure not exceeding 2 inches of mercury. The device leak
rate shall not exceed 0.02 LPM at a pressure of 17 inches of water.
3.6.3.1 Pressure relief device high temperature exposure. The pressure relief device
shall operate as specified after exposure to 250o +5oF.
3.6.3.2 Pressure relief device cycling. The pressure relief device shall operate as
specified after being cycled from closed to open and back to closed 50 times.
3.6.4 Pressure breathing test port. The pressure breathing test port (see figure 5) shall be
provided with a 20 micron filter.
3.6.4.1 Air inlet test port. A force of 2.5 +1.0 pounds shall be required to activate the air
inlet test port check valve (see figure 5). The air inlet port shall be provided with a cap and
tether.
3.6.5 Supply control.
3.6.5.1 Supply lever. A lever shall be provided on the regulator panel to activate the
supply valve to shut off the oxygen supply when the regulator is not in use. The supply lever
shall have on and off positions. With the supply lever in the off position, the air mixing port shall
be closed.
3.6.5.2 Supply lever activation. The regulator shall operate as specified herein after the
supply valve has been cycled from open to closed and back to open 1,000 times. A force of 53
+
37 ounces shall be required to move the supply lever to either position. The supply lever shall
not stop between the on and off positions (see 6.9).
3.6.6 Diluter control.
3.6.6.1 Diluter lever. A lever shall be provided on the regulator panel to control the air
mixing port. The air mixing port shall enable the regulator to deliver either diluted oxygen or
pure oxygen (see3.6.11). The diluter lever shall have normal oxygen and 100% oxygen positions.
3.6.6.2 Diluter lever activation. A force of 33 +17 ounces shall be required to move the
diluter lever to either position. Stops shall be provided at the normal oxygen and 100% oxygen
positions. The diluter lever shall not stop between the normal oxygen and 100% oxygen
positions.
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