MIL-PRF-46720C
3.3.9 Solenoid temperature rise. The valve solenoid shall not exceed a temperature rise
greater than 39 degrees Fahrenheit (°F) (3.9 degrees Celsius (°C)) per minute of continuous
operation, when used with voltages specified herein.
3.3.10 Dielectric strength. The solenoid shall withstand application of 1000 V root mean
square (rms), (60 hertz (Hz)) potential, between terminals and ground, without flashover.
Insulation shall evidence no loosening, cracking, charring, burning, smoking, rupture, or other
damage resulting in a reduction in dielectric strength.
3.4 Interface requirements.
3.4.1 Overall envelope and interfaces. The valve shall fit into the hydraulic system with
the loader-transporter, guided missile (Hawk Loader) in accordance with the envelope dimensions
and the electrical and mechanical interfaces locations and dimensions of drawings 9008233 or
9098673.
3.4.2 Weight. The gross weight of the valve shall not exceed 2 pounds (lb) (0.9 kilogram
(kg)).
3.4.3 Solenoid. The solenoid for operating the hydraulic valve shall be compact, designed
for continuous or intermittent duty, and shall be provided with single coil windings. The solenoid
shall be totally enclosed and shall be so designed that hydraulic fluid can at no time come in
contact with the electrical windings.
3.4.4 Coils. The coils shall be evenly wound and insulated to meet the performance
requirements specified herein. The coils shall be completely insulated from all other parts of the
valve. Coils shall be suitably taped and impregnated, as required, to prevent damage under
prolonged exposure to environmental conditions.
3.4.5 Radio interference suppression. The valve, solenoid, shall conform to
electromagnetic compatibility requirements of figures 1 and 2.
3.5 Ownership and support requirements.
3.5.1 Endurance. The valve shall withstand 20000 cycles of operation at 3000 psi
(20 685 kPa) hydraulic pressure, without damage. A cycle of operation shall consist of operation
of the valve from the de-energized position to the energized position, and back to the
de-energized position. The valve shall subsequently meet the requirements of 3.3.2 through 3.3.6,
and 3.3.8.
3.5.2 Safety. Valves shall be physically and electrically safe to operate.
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