MIL-PRF-23256C
psig. The control valve shall be closed. At the completion of the test, the seal valve assembly
shall be visually inspected and shall meet the high temperature requirements specified in 3.5.6.
The seal valve assembly shall then be subjected to and shall meet the requirements of the leakage
and the operating pressure tests (see 4.5.3 and 4.5.4).
4.5.7 Low temperature. The seal valve assembly shall be subjected to the low temperature
test in accordance with MIL-STD-810, Method 502.3, Procedure I for a period of 4 hours. The
storage temperature shall be -65°F (-54°C). The seal valve assembly shall be mated to the test
fixtures (see 4.4.4). While at test temperature conditions, the inlet shall be pressurized to
3,800 ±100 psig. The control valve shall be closed. At the completion of the test, the seal valve
assembly shall be visually inspected and shall meet the low temperature requirements specified in
3.5.7. The seal valve assembly shall then be subjected to and shall meet the requirements of the
leakage and the operating pressure tests (see 4.5.3 and 4.5.4).
4.5.8 Thermal shock. The seal valve assembly shall be subjected to the temperature shock
test in accordance with MIL-STD-810, Method 503.3, Procedure I. The seal valve shall be mated
to the test fixtures (see 4.4.4). Before the seal valve being subjected to the test temperature
conditions, the inlet shall be pressurized to 3,000 ±100 psig with the control valve closed. At the
completion of the test, the seal valve assembly shall be visually inspected and shall meet the
requirements specified in 3.5.8. The seal valve assembly shall then be subjected to and shall meet
the requirements of the leakage and operating pressure tests (see 4.5.3 and 4.5.4).
4.5.9 Salt fog. The seal valve assembly shall be subjected to the salt fog test in accordance
with MIL-STD-810, Method 509.3, Procedure I except the duration shall be 50 hours. The seal
valve assembly shall be mated to the test fixtures (see 4.4.4) except the outlet shall be sealed with
a protective cap conforming to MIL-C-5501/3. While at test conditions, the inlet shall be
pressurized to 225 ±25 psig. At the completion of the test, the seal valve shall be visually
inspected and shall meet the salt fog requirements specified in 3.5.9. The seal valve assembly shall
then be subjected to and shall meet the requirements of the leakage and operating pressure tests
(see 4.5.3 and 4.5.4).
4.5.10 Humidity. The seal valve assembly shall be subjected to the humidity test in
accordance with MIL-STD-810, Method 507.3, Procedure I except the four 24-hour cycles shall
be substituted for the ten 24-hour cycles. The seal valve assembly shall be mated to the test
fixtures (see 4.4.4) except the outlet shall be sealed with a protective cap conforming to
MIL-C-5501/3. While at test conditions, the inlet shall be pressurized to 225 ±25 psig. At the
completion of the test, the seal valve shall be visually inspected and shall meet the requirements
specified in 3.5.10. The seal valve assembly shall then be subjected to and shall meet the
requirements of the leakage and operating pressure tests (see 4.5.3 and 4.5.4).
4.5.11 Vibration. The seal valve assembly shall be subjected to the following vibration tests.
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