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|  MIL-V-81995(AS)
4.5.2
Cycling and endurance. Including the calibration
cycles, the valve shall be subjected to a total of 10,000 endurance
cycles at the conditions specified in Table III. Airflow through the
valve shall be controlled as specified in 4.5.1 and electric power shall
be 28 volts do The valve shall remain in the open and closed positions
for a minimum of 5 seconds during each cycle throughout this test except
during period II when the cycling rate shall be 60 seconds open followed
by 60 seconds closed and during period III when the cycling rate shall
be 2 minutes open followed by 5 minutes closed. Data shall be recorded
to first, midway and last cycle during each period of testing to show
compliance with the opening and closing the requirements of this specifi-
cation, (see 4.5.3) and internal and total leakage shall be measured
(see 4.5.4) after every period. Failure of the valve to meet operation
and leakage requirements throughout the test shall be cause for rejection.
Table 111.
Endurance cycles
NO. OF
TIME (SEC)
ON OFF
CYCLES
INLET AIR CONDITION
PERIOD
TEMPERATURE
2500
5
5
I
Max Pressure and
Ambient
Rated Temperature
60
900
60
Max Temperature and
II
Maximum Operating
Rated Pressure
111
120 300
100
Max Temperature and
Maxi.mum Operating
Max Pressure
Iv
5
5
5000
Rated Temperature
Ambient
and Rated Pressure
1500
v
5
5
Max Temperature and
Maximum Operating
Interbreed Pressure
Openin g-closing time. With the inlet side of the
4.5.3
valve pressurized to any inlet condition specified in the specification
sheet, the valve shall move from the full closed position to the required
regulating position, when the electrical circuit to the valve is energized
within the time specified in the specification sheet. With the valve
inlet pressurized to the maximum pressure inlet condition, the rate of
pressure rise shall not exceed that specified in the specification sheet
at any ambient temperature or inlet air conditions within its operating
range. Zero time is considered to be coincident with actuation of the
switch which either energizes or deenergizes the control circuit. The
valve electrical circuit shall be deenergized and the closing time shall
be within the time specified in the specification sheet.
24
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