MIL-PRF-62382C
3.4.5.1 High temperature. The valve shall operate after exposure to an ambient
temperature of +70 degrees Celsius (°C) (+160 degrees Fahrenheit [°F]) and during and after
exposure to +60 °C (+140 °F) (see 4.5.5.1).
3.4.5.2 Low temperature. The valve shall operate after exposure to an ambient
temperature of -54 °C (-65 °F), and during and after exposure to -32 °C (-25 °F) (see 4.5.5.2).
3.4.5.3 Fluid temperature. The valve shall operate when exposed to hydraulic fluid
temperatures ranging from +70 °C (+160 °F) to -32 °C (-25 °F) (see 4.5.5.3).
3.4.5.4 Salt fog. The valve shall operate after exposure to a salt-fog environment
(see 4.5.5.4).
3.4.5.5 Shock resistance. The valve shall operate after exposure to a shock impulse of
25 gravity units (g) for 11 +0/-1 milliseconds (ms), half-sine wave, applied along three mutually
perpendicular axes (see 4.5.5.5).
3.4.5.6 Vibration resistance. The valve shall operate after exposure to the following
vibration conditions (see 4.5.5.6).
a.
Simple harmonic motion.
b.
Motion applied along three mutually perpendicular axes.
c.
Peak acceleration of 10g at all frequencies.
d.
Frequency range, 20 to 2000 Hertz (Hz).
e.
Frequency sweep varied logarithmically.
f.
Sweep time, 35±5 minutes.
g.
Dwell 5 minutes at each observed resonant frequency.
3.5 Cleanliness. Upon completion of testing, sufficient quantity of fluid shall be retained
in the valve to assure proper preservation during extended storage. Ports shall be covered with
suitable plugs. Valve internal cleanliness shall conform to the level shown in table I (see 4.6).
TABLE I. Valve internal cleanliness.
Maximum size of
Maximum
surface particles
quantity of
(micrometers)
particles
25
7450
50
1020
100
95
250
2
5
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