Unless otherwise specified, actuators shall
4.5 2 Ambient test conditions.
be tested under ambient temperatures between 15 and 40 degrees Celsius (C)
4.6 Test methods.
4.6.1 Visual examination. The rotary actuator shall be visually and
dimensionally examined to verify conformance to this specification and the
applicable specification sheet. Deviation from the specified dimensions,
finishes, and configuration shall be cause for rejection.
4.6.2 Run-in test. The actuator shall be cycled at least 10 times to ensure
the chambers are properly filled with hydraulic fluid and that any trapped air is
purged from the actuator. Visual examination shall be made to ensure there are no
signs of external leakage and that the rotary actuator can achieve the specified
rotation (see 3.4.5). If the actuator is equipped with electrical position
indication switches, the switches shall be continuity tested to ensure that they
are functioning in response to actuator rotation.
4.6.3 Pressure and leakage test. Unless otherwise specified, the pressure
test and leakage test shall be performed as specified herein. When pressurizing
each port, the actuator shall be permitted to travel to its full stroke. The test
procedure shall be as follows:
(a) The actuator shall be operated at the rated output torque and
operating pressure for a minimum of 30 minutes with the gear
chamber open. During this period, the actuator shall be cycled at
a rate of two to six cycles per minute and the internal leakage
shall be collected. The pressure shall then be relieved and the
actuator examined for signs of external leakage, loosening of the
fasteners, or damage to any part of the actuator.
Internal
leakage shall not exceed the values specified (see 3.4.10).
(b) The port shall then be pressurized to the specified proof pressure
for a minimum of 15 minutes. The pressure shall then be relieved
and the actuator examined for signs of external leakage, loosening
of the fasteners, or damage to any part of the actuator. Internal
leakage in excess of three times the specified values (see 3 4.10)
shall constitute a failue of the test
The test shall be repeated for each of the actuator ports. Upon completion of the
test. the actuator shall be cycled at least five times to ensure the unit is
functioning and able to meet its rotational requirement (see 3.4.5)
The failure
to meet the specified leakage requirement or evidence of loosening, damage, or
external leakage shall constitute a failure of the test. For quality conformance,
the minimum time to maintain the specified operating pressure shall be reduced
from 30 minutes to 15 minutes. The time to maintain the proof pressure shall be
reduced from 15 minutes to 5 minutes
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