MIL-DTL-87223A (USAF)
4.5.11 Internal corrosion.
With the valve maintained at a temperature of 135 ±5 °F, a salt fog in accordance with the
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 pass
the tests specified in 4.5.2, 4.5.3, 4.5.4, 4.5.5, and 4.5.6.
FIGURE 4. Random vibration vs frequency.
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