MIL-PRF-27639D
4.7.5 Hydrostatic pressure A discharged CO cylinder shall be installed for this test. A
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hydrostatic pressure of 1500 PSI shall be applied to the outlet of the inflator valve for a period of
not less than 5 minutes. The actuator shall be in the operated position. There shall not be any
deformation or leakage of the inflator valve. After completion of this test, the inflator valve shall
be subjected to the tests specified in 4.7.6.
4.7.6 Salt spray. The inflator valve shall be subjected to a 96-hour salt spray test in accordance
with the test methods in ASTM-B-117. After the salt-spray test, there shall be no corrosion.
After the completion of the salt-spray test, the inflator valve with a charged CO
2 cylinder
conforming to MIL-PRF-25369 installed, shall be held in an inverted position with a 20-pound
load attached to the end of the actuator and with the actuator held in the normal position. When
the load is released, the actuator shall operate the piercing mechanism which shall pierce and
discharge the CO cylinder in not more than 2.5 seconds. The actuator safety restraint shall not be
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used to secure the actuator during this test.
4.7.7 Leakage. With the inflator valve mounted on a valve stem, with the valve stem cap in
place , the actuator shall be moved slowly through a normal cycle of operation. A pressure of
40 PSI shall be applied to the outlet and any indication of leakage shall be cause for rejection.
4.7.8 Operation test with CO cylinder The inflator valve shall be mounted on a valve stem
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with the valve stem cap in place. A charged CO
2 cylinder conforming to MIL-PRF-25369 shall be
installed. The inflator assembly shall be held in an inverted position with a load attached to the
lever of the actuator and the actuator held in the normal position. The outlet shall be equipped
with a chamber that shall provide between 1.5 and 2.5 PSI back pressure on the inflator valve.
The load shall be such that a force of 20 pounds is applied to the actuator. When the load is
released, the actuator shall operate the piercing mechanism which shall pierce and discharge the
CO2 cylinder in not more than two and one half seconds. The actuator safety restraint shall not be
used to secure the actuator in this test. No leakage shall be evident during the duration of this
test.
4.7.9 Lock. The lock on the installed COcylinder (conforming to MIL-PRF-25369) shall be
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tested by applying a torque of 60 inch-pounds in a counterclockwise direction to loosen the
installed CO cylinder. The CO cylinder shall release with a torque of not less than 30 nor more
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than 60 inch-pounds.
4.7.10 Actuator safety restraint The inflator valve shall be held in an inverted position with a 20-
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pound load attached to the actuator. The actuator shall be held in the normal position with the
actuator safety restraint installed. When the load is released , the replacable, actuator safety
restraint shall prevent the actuator from operating the piercing mechanism during the test.
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