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|  MIL-V-46727C(AT)
be charged to 3000 psi hydraulic pressure and specified flow (see 3.4.1) shall be maintained for a
period of 4 hours. At the conclusion of the exposure period, the valve shall be tested as specified
in 4.7.3.7 (50 cycles only). The valve shall then be cooled to room temperature and tested as
specified in 4.7.3.1, 4.7.3.6, and 4.7.3.7 (50 cycles only).
4.7.3.9 Low temperature. To determine conformance to 3.4.8.2, the valve shall be placed
within a test chamber and exposed to low temperature as specified in MIL-STD-810,
method 502, procedure II, for a time period of 24 hours. After 24 hours of low temperature
exposure, the valve shall be charged to a hydraulic pressure of 3000 psi, and a flow as specified
(see 3.4.1) shall be maintained for a period of 4 hours. At the conclusion of the 4 hour period,
the valve shall be tested as specified in 4.7.3.7 (50 cycles only). The valve shall then be
stabilized at room temperature and tested as specified in 4.7.3.1, 4.7.3.6, and 4.7.3.7
(50 cycles only).
4.7.3.10 Fungus. To determine conformance to 3.4.8.3, the valve shall be subjected to the
fungus resistance test specified in MIL-STD-810, method 508. Subsequent to this test, the valve
shall be tested as specified in 4.7.3.1, 4.7.3.6, and 4.7.3.7 (50 cycles only).
4.7.3.11 Salt spray. To determine conformance to 3.4.8.4, the valve shall be subjected to salt
spray tests as specified in MIL-STD-810, method 509, the exposure period shall be for
100 hours. Subsequent to this test, the valve shall be tested as specified in 4.7.3.1, 4.7.3.6, and
4.7.3.7 (50 cycles only).
4.1.3.11.1 Valve spool corrosion. To determine conformance to 3.4.8.4.1, the valve spool
shall be removed from the assembly and subjected to the corrosion test specified in ASTM B117
for not less than 30 hours. After testing, valve spool shall exhibit no corrosion.
4.7.3.12 Sand and dust. To determine conformance to 3.4.8.5, the valve shall be subjected to
the sand and dust tests, as specified in MIL-STD-810, method 510, procedure I, at a temperature
of not more than plus 125F. Subsequent to this test the valve shall be tested as specified in
4.7.3.1, 4.7.3.6, and 4.7.3.7 (50 cycles only).
4.7.3.13 Shock. To determine conformance to 3.4.8.6, the valve shall be subjected to the
shock tests specified in MIL-STD-810, method 516, procedure I, the value of shock shall be
15 units of gravity (g) exerted through a sawtooth pulse for a period of 11 + 1 milliseconds.
Subsequent to this test, valve shall be examined for evidence of damage and tested as specified
in 4.7.3.1, 4.7.3.6, and 4.7.3.7 (50 cycles only).
4.7.3.14 Vibration. To determine conformance to 3.4.8.7, the valve shall be securely
mounted to a vibration table and subjected to vibration test specified in MIL-STD-202,
method 201A, except vibration shall be for 1 hour only at plus 77 + 15F and 30 minutes at
minus 65 + 5F in each direction of the three major axes. Upon test completion, the valve shall
be examined for evidence of damage and tested as specified in 4.7.3.1, 4.7.3.6, and 4.7.3.7
(50 cycles only).
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