MIL-DTL-87255A(USAF)
4.5.9.3.2.2
Dwells.
Dwells shall be conducted in the frequency range from 100 to 1000 Hz at the four most
significant resonant frequencies from 4.5.9.2.
4.5.10 Salt fog.
The valve shall be subjected to a salt fog test in accordance with method 509.4 of MIL-STD-
810. The valve shall be examined for evidence of corrosion to all exposed surfaces. If the
valve exhibits any corrosion indicative of dissimilar metals or corrosion that could preclude
normal operation or create any unsafe condition, the valve shall be rejected. The valves shall
operating force can be between 1.25 and 2.0 Gz and the outlet pressure can vary by an
additional ±1.0 psi.
FIGURE 7. Combined random and sinusoidal vibration for gunfire environment.
4.5.11 Internal corrosion.
With the valve maintained at a temperature of 135 ±5 °F, a salt fog in accordance with the
salinity requirements of MIL-STD-810, method 509.4, at a temperature of 135 ±5 °F, shall be
passed through the valve in the normal direction of flow at approximately three flow cycles per
minute for a duration of at least 15 minutes. The rate of flow of salt fog shall be no less than 30
liters per minute. This procedure shall be performed at least 10 times with the valve dried after
each 15 minute period. After completion of the above tests, the valve shall be subjected to and
between 1.25 and 2.0 Gz and the outlet pressure can vary by an additional ±1.0 psi.
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