A-A-52429A
2.3.8 Voltage transient. The valve shall perform as specified when subjected to transient
voltages as specified in MIL-STD-1275.
2.3.9 Rated flow. The flow capacity of the valve shall be not less than 0.25 gallon per minute
(gpm), inlet to outlet, with a pressure drop across the valve of 75 psi.
2.3.10 Internal leakage. With the solenoid de-energized and the valve closed, a pressure of
3000 psi shall be applied to the inlet port and held for 2 minutes; the internal leakage at the outlet
shall not exceed 0.25 ml after 2 minutes.
2.3.11 External leakage. There shall be no evidence of leakage through external seals.
Verification is done by visual examinations.
2.3.12 Operating time. The units shall open in not more than 1 second by establishing flow at a
rate of 0.25 gpm at 3000 psi after the solenoid shown in drawing 12265543 test circuit has been
energized.
2.3.13 Closing time. The units shall close in not more than 1 second by terminating flow after
the solenoid shown in drawing 12265543 test circuit has been de-energized.
2.4 High temperature. The solenoid valve shall operate when subjected to a high ambient
temperature of 140F. The valve unit shall not be damaged nor its performance impaired after
storage in a non-operating mode at a high ambient temperature of 158F.
2.5 Low temperature. The solenoid valve shall operate when subjected to a low ambient
temperature of minus (-) 26F. The valve unit shall not be damaged nor its performance
impaired after storage in a non-operating mode at a low ambient temperature of -65F.
2.6 Hydraulic fluid temperature. The solenoid valve shall operate using hydraulic oil in
accordance with 2.1.1 at operating oil temperatures of -26F to 170F with ambient air conditions
as specified in 2.4 and 2.5.
2.7 Shock (non-operating). The units shall operate after exposure to a shock impulse of
25 gravity units (g) for 11 milliseconds (ms), half-sine wave form.
2.8 Vibration (non-operating). The valve shall meet the performance requirements and show no
evidence of failure or damage after performance of a vibration test in accordance with 2.8.1 and
2.8.2.
2.8.1 Low frequency. The valve shall be subjected to a simple harmonic motion having an
amplitude of 0.03 inch (in.) (0.06 in. maximum total excursion) with the frequency being varied
uniformly between the approximate limits of 10 to 55 Hertz (Hz). The entire frequency range,
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