MIL-DTL-46725D(AT)
rate as specified (see 3.3.1) 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 4.3.4.7 for 50 cycles. After testing stabilize
the valve at room temperature and verify that it passes the tests of 4.3.4.1, 4.3.4.6, and 4.3.4.7 for
50 cycles.
4.3.7.3 Fungus. The valve shall be subjected to the fungus test specified in method
508.4 of MIL-STD-810 or equivalent. Upon completion of the test the valve shall be subjected to
and pass the tests of 4.3.4.1, 4.3.4.6, and 4.3.4.7 for 50 cycles.
4.3.7.4 Corrosion. The valve assembly shall be subjected to 40 cycles of Accelerated
Corrosion Test GM 9540P, method B. Following the exposure the valve shall be subjected to and
pass the tests of 4.3.4.1, 4.3.4.6, and 4.3.4.7 for 50 cycles.
4.3.7.4.1 Valve spool corrosion. The valve spool shall be removed from the assembly,
tested as specified in 4.3.4.1, 4.3.4.6, and 4.3.4.7 and subjected to 20 cycles of Accelerated
Corrosion Test GM 9540P, method B. After testing, the valve spool shall exhibit no corrosion in
order to meet the corrosion requirement of 3.6.4.
4.3.7.5 Dust. The valve shall be subjected to the blowing dust test (procedure I) specified
in method 510.3 of MIL-STD-810 or equivalent, except that the maximum temperature shall be
52°C (+125°F). Following the test, the valve shall be subjected to and pass the tests of 4.3.4.1,
4.3.4.6, and 4.3.4.7 for 50 cycles.
4.3.7.6 Shock. The valve shall be subjected to a half sine shock pulse of 15 gravity units
(g) for a period of 11 milliseconds (see figure 1). Following the test, the valve shall be examined
for evidence of damage and shall be subjected to and pass the tests of 4.3.4.1, 4.3.4.6, and 4.3.4.7
for 50 cycles.
4.3.7.7 Vibration. The valve shall be subjected to a simple harmonic motion having an
amplitude of 0.8 mm (0.03 in.) [1.5 mm (0.06 in.) maximum total excursion), the frequency being
varied uniformly between the approximate limits of 10 and 55 hertz (Hz). The entire frequency
range, from 10 to 55 Hz and return to 10 Hz, shall be traversed in approximately 1 minute. The
vibration shall be for 1 hour at 25 + 8°C (77 + 15°F) and 30 minutes at -54°C (-65 + 5°F) in each
direction of the three major axes. Following the vibration, the valve shall be examined for
evidence of damage and shall be subjected to and pass the tests of 4.3.4.1, 4.3.4.6, and 4.3.4.7 for
50 cycles.
11
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business