MIL-DTL-87223A (USAF)
4.5.6 Response time.
A tank shall be connected as specified in 4.4.4.1 during this test. A source of pressurized gas
shall be connected to the valve inlet connection and the pressure increased to and maintained
at 100 psig. A pressure transducer shall be connected to the tank to allow tank pressure to be
recorded as a function of time. Acceleration forces of 6, 1, 10 and 1 Gz shall be applied, in this
order, to the valve. Each force shall be maintained for at least 10 seconds before the next force
is applied. Tank pressure shall be recorded as a function of time for at least 5 seconds
following the application of each force level. The time interval from the time of application of
each force level to the time at which the tank pressure reaches the value specified in 3.5.5 shall
not exceed the response time specified in 3.5.5.
4.5.7 High temperature exposure.
The pressure regulating valve shall be conditioned at a temperature of 400 ±5 °F for eight hours.
After this period, the valve shall be immediately subjected to and pass the tests specified in
4.5.2, 4.5.3, 4.5.4, 4.5.5, and 4.5.6.
4.5.8 Low temperature exposure.
The pressure regulating valve shall be stabilized at a temperature of -65 ±5 °F. After this period,
the valve shall be warmed to -40 ±5 °F and immediately subjected to and pass the tests
specified in 4.5.2, 4.5.3, 4.5.4, 4.5.5 and 4.5.6.
4.5.9 Vibration.
The anti-G valve shall be subjected to the following vibration tests while the valve is subjected to
an inlet pressure of 300 psig:
a. Vibrate the anti-G valve for one hour in each of three mutually orthogonal axes to the
following random vibration envelope:
0.04 G2/Hz from 15 to 225 Hz
±4 dB/Octave slope from 225 to 300 Hz
0.06 G2/Hz from 300 to 1000 Hz
-6 dB/Octave decay from 1000 to 2000 Hz
Resonance search between 10 and 2000 Hz shall also
be done with sinusoidal vibration at 0.02 inches double
amplitude or ±2 Gz, whichever is less, to identify
resonant frequencies in the valve assembly.
There shall be no damage to the valve and the valve shall not fail to function as a result of the
test. Upon completion of this test, the valve shall be subjected to and pass the tests specified in
4.5.2, 4.5.3, 4.5.4, 4.5.5, and 4.5.6.
b. The anti-G valve shall be subjected to random vibration in accordance with figure 4.
c. The anti-G valve shall be subjected to sine dwells in accordance with table IV. There
shall be no damage to the valve and the valve shall not fail to function as a result of the test.
Upon completion of this test, the valve shall be subjected to and pass the tests specified in
4.5.2., 4.5.3, 4.5.4, 4.5.5, and 4.5.6.
d. The anti-G valve shall be subjected to vibration along each mutually perpendicular
axis. The excitation shall consist of four, phase uncorrelated sinusoids superimposed over a
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