MIL-DTL-25677E
4.7.7 Pressure drop test (see 3.7.6). An adapter and nozzle shall meet the pressure drop
requirements of 3.7.6. With the adapter connected to a nozzle, the assembly shall be filled with oil and
cold-soaked at -65°F (-53.9°C) for 24 hours. While maintained at this temperature, the following
procedure shall be conducted:
a. Grade 3 or 4 oil in accordance with MIL-PRF-7808 at -65 °F shall be flowed through the
assembly at the rate of 1 gallon per minute (gpm) (3.78 liter per minute (lpm).
b. The maximum pressure drop across the assembly required to establish rated flow shall be
determined.
c. Pressure measurements shall be taken at least 10 diameters upstream and 10 diameters
downstream from the assembly.
d. Temperature measurements shall be taken 10 diameters upstream of the assembly.
e. The maximum pressure drop shall then be determined with the oil entering the assembly at
-45°F (-42.8°C) and at a flow rate of 1 gpm (3.78 lpm). The pressure drop with -45°F
(-42.8°C) oil shall not exceed the pressure drop shown for the applicable nozzle dash
number in accordance with MIL-DTL-25677/3.
f. Pressure measurements shall be taken at least 10 diameters upstream and 10 diameters
downstream from the assembly.
g. Temperature measurements shall be taken 10 diameters upstream of the assembly.
4.7.8 Corrosion test (see 3.7.7). The adapter, nozzle, pressure cap, dust cap shall meet the
corrosion requirements of 3.7.7. The following details shall apply:
a. The adapter, nozzle, pressure cap, dust cap shall be immersed in a solution consisting of
2.5%, by weight, of sodium chloride in distilled water.
b. After immersion, the solution shall be drained and the components heated in an oven to a
temperature of 130°F ± 5°F (54.44°C ± 9°C) for a period of not less than 1 hour.
c. The immersion and heating cycle shall be repeated 50 times.
d. The components shall not be operated at any time during these cycles.
e. Immediately after completing the immersion and heating cycles, the components shall be
thoroughly washed with warm water to remove all salt accumulations.
f. The adapter shall then be dried, wetted with oil, and connected and disconnected with each
accessory (nozzle, pressure cap, dust cap ) for three complete cycles.
4.7.9 Side load test (see 3.7.8).
a. The adapter shall be mounted to a test fixture simulating a typical installation.
b. The adapter shall be connected to the nozzle and a 2-pound (907 g) weight simulating the
weight of the hose shall be applied to the hose end of the assembly perpendicular to the center
axis, for a period of 10 minutes minimum.
c. During this time, grade 3 or 4 oil in accordance with MIL-PRF-7808 shall be flowed through the
assembly at the rate of 2 gpm (8.81 lpm) with a back pressure of 25 psi (1.72 bar) minimum.
d. At the completion of this test, the adapter shall be visually inspected for cracks, distortion, or
4.7.10 Poppet spring test (see 3.7.9). The force required to open the adapter poppet valve its full
travel shall be measured and shall meet the requirement of 3.7.9.
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