MIL-R-17852C(AS)
outlet shall be varied from zero to 140 1pm (NTP), in increments of 20
1pm. The outlet pressure shall be recorded at the various flow rates.
The test procedure shall be repeated utilizing inlet pressures of 1800,
1000, 500, and 250 psig. The reducer shall pass the requirements specified
in 3.6.2.1.
4.6.3.2 Type II. The reducer shall be preset at 80 psig and the
inlet connected to an oxygen pressure source. The test procedure specified
in 4.6.3.1 shall be repeated utilizing inlet pressures cf 1800, 1000,
500 and 250 psig. The reducer shall pass the requirements specified in
3.6.2.2.
4.6.4 Shut-off valve.
4.6.4.1 Type I. The reducer shall be connected to an oxygen pressure
source and the reducer subjected to an inlet pressure of 250 psig. The
shut-off valve shall then be turned to the "on" position, and the flow
recorded. The inlet pressure shall then be increased to 2400 psig. The
reducer shall be turned to the "off" position and the flow recorded.
The force required to open and close the valve shall also be noted. The
reducer shall pass the requirements specified in 3.6.3.1.
4.6.4.2 Type II. The reducer shall be connected to an oxygen pressure
source and the reducer subjected to an inlet pressure of 250 psig. The
emergency supply release assembly shall be actuated and the flow recorded.
The inlet pressure Shall then be increased to 1800 psig. The pull force
required to actuate the emergency supply release assembly shall first be
measured with zero pressure applied to the outlet of the reducer and
again, after resetting the reducer, with 90 psig from an external source
of oxygen applied to the outlet of the reducer. The release assembly
shall be engaged and the flow measured with an inlet pressure of 1800
psig. The reducer shall pass the requirements specified in 3.6.3.2.
4.6.5 Pressure relief. A pressure of 1800 psig shall be applied to
the inlet of the pressure regulating valve. An increasing pressure
shall then be applied to the outlet of the valve until the relief valve
opens. The relief valve opening pressure shall be noted. The relief
valve pressure shall then be adjusted to 130 psig and the flow rate
through the relief valve shall be noted. The valve outlet pressure
shall then be decreased until the relief valve closes. The relief valve
closing pressure shall be noted. The valve shall pass the requirements
specified in 3.6.4.
4.6.6 Proof pressure. The reducer shall be connected to an oxygen
pressure source and the reducer subjected to an inlet pressure of 3000
psig. The 3000 psig pressure shall be maintained for a period of 3
minutes and the reducer shall pass the requirements specified in 3.6.5.
4.6.7 High and low temperature operation. A pressure of 1800 psig
shall be applied to the inlet of the reducer. The reducer shall then be
subjected to a temperature of 160 ± 5°F (71 ± 2.8°C) for 3 hours.
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