MIL-PRF-83178C
3.6.7 Pressure control.
3.6.7.1 Pressure lever. A lever shall be provided on the regulator panel to ensure that a
positive pressure may be obtained at the regulator outlet at altitudes where automatic positive
pressure is not delivered. The pressure lever shall have emergency, normal, and test mask
positions.
3.6.7.2 Pressure lever activation. A force of 33 +17 ounces shall be required to move the
pressure lever from the normal to emergency positions. A force of 53 +37 ounces shall be
required to move the pressure lever from the normal to the test mask position. When released
from the test mask position, the pressure lever shall return to normal position. The pressure lever
shall not stop between emergency, normal, or test mask positions.
3.68 Tester compatibility. The regulator shall meet the test requirements of TO 15X-1-1
using the Tester, Pressure Breathing, Gaseous (PBG) Oxygen Regulator, Field (pneumatic) (see
6.8).
3.6.9 Excess flow characteristics. The regulator shall withstand an excess flow
characteristic produced by holding the pressure lever in the test mask position for 2 seconds.
3.6.10 Flow suction characteristics. With either increasing or decreasing suction applied
to the outlet, the supply Pressure as shown, and the diluter lever in either the normal oxygen or
100% oxygen positions, the outlet pressure required to obtain the listed flow rate at the given
pressure altitude range shall conform to table I (see 6.8 and 6.11).
3.6.11 Added oxygen. The ratio (by volume) of oxygen added by the regulator from the
oxygen system to total gas delivered through the outlet shall conform to table II (see 6.13).
3.6.12 Pressure breathing characteristics. With either increasing or decreasing flow, and
the diluter lever in the normal oxygen position, the pressure breathing characteristics of the
regulator shall be within the limits specified tin table III. A means shall be provided to prevent
negative pressure within oxygen mask at altitudes between 30,000 and 40,000 feet (see 6.8).
TABLE I. Flow suction characteristics
Supply pressure
Outlet flow rates
Pressure altitude range
Outlet pressure*
(psig)_
(LPM)
(X1,000 ft)
(inches of water)
50 to 500
0 to 30
0 to 27
-0.45 to 1.0
50 to 500
31 to 50
0 to 27
-0.7 to 1.0
50 to 500
51 to 85
0 to 27
-1.0 to 1.0
50 to 500
86 to 135
10 to 27
-1.0 to 1.0
* The positive outlet pressure shall apply only for altitudes above 15,000 feet. A suction shall be
required to induce a flow of oxygen in excess of 0.01 LPM below 15,000 feet.
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