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|  MIL-V-46727C(AT)
3.4.2.2 Type II. The torque required to operate the valves shall be not more than
25 pound-inches (see 4.7.3.2).
3.4.3 Operating pressure. The valve shall operate satisfactorily throughout a hydraulic
pressure range of 0 to 3000 psi applied to any port, except the return, while using a hydraulic
fluid conforming to MIL-H-5606 or MIL-H-6083 (see 4.7.3.3).
3.4.4 Proof pressure. The valve shall withstand a hydraulic proof pressure of 4500 psi,
except for the return port which shall withstand 1500 psi, without external leakage, permanent
deformation, or failure (see 4.7.3.4).
3.4.5 Burst pressure. The valve shall withstand a hydraulic pressure of 7500 psi, except for
the return port which shall withstand 2500 psi, without bursting (see 4.7.3.5).
3.4.6 Internal leakage. The valve shall withstand application of 3000 psi hydraulic pressure
to sealing members of the individual fluid chambers without external leakage, and with a
combined internal leakage from the ports not exceeding 10 cubic centimeters per minute
(cc/min) (see 4.7.3.6).
3.4.7 Endurance. The valve shall withstand 20000 cycles of operation at 3000 psi hydraulic
working pressure, without external leakage. A cycle shall consist of an operation of the valve
from one extreme position to the other extreme position and return to the starting position. The
valves shall subsequently meet the requirements of 3.4.6 (see 4.7.3.7).
3.4.8 Environmental.
3.4.8.1 High temperature. The valve shall withstand exposure to a high temperature of
160 + 5F in accordance with method 501, procedure II of MIL-STD-810, without damage and
shall conform to the performance requirements of 3.4.1 and 3.4.7. Subsequent performance shall
conform to 3.4.1, 3.4.6, and 3.4.7 (see 4.7.3.8).
3.4.8.2 Low temperature. The valve shall withstand exposure to a low temperature of
-65 (+5, -0) 0F in accordance with method 502, procedure II of MIL-STD-810, without damage
and shall conform to the performance requirements of 3.4.1 and 3.4.7. Subsequent performance
shall conform to 3.4.1, 3.4.6, and 3.4.7 (see 4.7.3.9).
3.4.8.3 Fungus. The valve shall withstand exposure to fungus in accordance with
method 508 of MIL-STD-810. After having been subjected to conditions favorable to fungus
growth as specified, the valves shall evidence no microbial growth that would adversely affect
performance. Subsequent performance shall conform to 3.4.1,3.4.6, and 3.4.7 (see 4.7.3.10).
3.4.8.4 Salt spray. The valve shall withstand exposure to salt spray in accordance with
MIL-STD-810, method 509, the duration of test shall be 100 hours. The valve shall evidence no
corrosion after being subjected to the salt spray tests. Subsequent performance shall conform to
3.4.1, 3.4.6, and 3.4.7 (see 4.7.3.11).
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