MIL-DTL-25677E
4.7.4 Operation and leakage test (see 3.7.3). The adapter shall meet the operation and leakage
requirements of 3.7.3. The following details shall apply.
a. This test shall be conducted on the adapter while connected to a test nozzle.
b. An adapter and nozzle shall be connected and disconnected 2,000 times consecutively while
dry.
(1) The assembly shall then be pressure checked with grade 3 or 4 oil in accordance with
MIL-PRF-7808 oil for 1 minute at a hydrostatic pressure of 500 psi (34.47 bar) minimum.
(2) There shall be no visible signs of leakage from the adapter portion.
c. The adapter and nozzle shall be disconnected and the following pressure tests conducted on
the adapter.
d. Using MIL-PRF-7808 oil, a hydraulic pressure of 500 psi (34.47bar) minimum, shall be applied
to the outlet end of the adapter for 5 minutes minimum.
e. A hydraulic back pressure of a 2-foot (609.6 mm) head minimum, of oil in accordance with
MIL-PRF-7808 shall be applied to the adapter for 1/2 hour minimum.
f. A hydraulic back pressure of oil equivalent to 5 psi (0.34 bar)minimum, shall be applied to the
adapter for 1/2 hour minimum.
g. The adapter shall be drained and an air back pressure of 4.5 psi (0.31 bar) minimum, shall be
applied to the adapter for 1/2 hour minimum.
4.7.5 Low temperature and leakage test (see 3.7.4). An adapter and nozzle when subjected to low
temperatures shall meet the requirements of 3.7.4. The following details shall apply:
a. An adapter and nozzle, while disconnected, shall be filled with grade 3 or 4 oil in accordance
with MIL-PRF-7808 and cold-soaked at a temperature of -65 °F (-53.9°C) for 24 hours
minimum.
b. The following tests shall then be conducted at an ambient temperature of -65°F (-53.9°C).
(1) The adapter and nozzle shall be connected and disconnected. This shall be
accomplished with relative ease and rapidity. Any binding, locking, or scoring of parts shall
be cause for rejection.
(2) The adapter and nozzle shall then be connected, and a hydrostatic pressure of 500 psi
(34.47 bar) minimum, of oil in accordance with MIL-PRF-7808 shall be applied at the
adapter inlet for 1 minute minimum.
(3) The adapter shall be subjected to the operation and leakage tests of 4.7.4d, e, f, and g.
4.7.6 High temperature leakage test (see 3.7.5). An adapter when subjected to high temperatures
shall meet the requirements of 3.7.5. The following details shall apply:
a. A high temperature test shall be conducted at an ambient temperature of 250°F (121°C)
minimum.
b. The adapter shall be heat-soaked for 2 hours minimum, and while maintained at 250°F
(121°C), the pressure tests of 4.7.4d, e, f, and g shall be repeated.
c. There shall be no visible signs of leakage.
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