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Temperature and humidity, non-operating condition |
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|  Temperature and humidity, non-operating condition.
Four
4.4.4.5
preproduction valves shall be subjected, in the non-operating condition,
to temperature and humidity cycling in the following manner: The
specimen shall be placed in a temperature chamber which has been stabilized
at an environmental temperature of -45 F +0 -5 F. The specimen shall
remain in the environment for 6 hours. (As an alternative procedure, the
specimen may be placed in the chamber, with the chamber at room ambient
temperature. Chamber temperature shall then be reduced to -45 F +0 -5 F
within 2 hours maximum. The specimen shall thereafter remain in the chamber
for 4 hours). The specimen shall then be subjected to an environmental
temperature of +140 F +5 F -0 F. Maximum transition time from the
low temperature to the high temperature shall be 2 hours. The specimen
shall remain in the high temperature environment for 4 hours. This cycle
shall be performed 3 times; maximum transition time shall be 2 hours.
The specimen shall subsequently be subjected to an environment of +110 F
+ 5 -0 F at a minimum relative humidity of 95 percent for a minimum
of 8 hours. Thereafter, 2 valves shall be operated in accordance with
4.4.4.6 and 2 valves shall be operated in accordance with 4.4.4.7.
Prior to operation the valves may be wiped dry. Drying by an air blast
or oven is not permitted.
Low temperature operating. Before testing, the valve,
4.4.4.6
installed in its test chamber in the ready condition, shall be conditioned
at a temperature of 0 F 5 F for a period of 1 hour. Immediately
thereafter the valve shall be operated in accordance with and meet the
at an environmental temperature
requirements of 4.5.4.l and 4.5.4.2
of +32 F 5 F.
4.4.4.7 High temperature operating. Before testing, the valve,
installed in its test chamber in the ready condition, shall be condi-
tioned at a temperature of +140 F 5 F for a period of 1 hour.
Immediately thereafter the valve shall be operated in accordance with
and meet the requirements of 4.5.4.1 and 4.5.4.2
at an environmental
temperature of +140 F 5 F.
Vibration. Packed and packaged. The valve, packed and
4.4.4.8
packaged in accordance with Section 5, shall be vibrated in such a
manner as to determine the frequency producing maximum transmissibility
within the frequency range of 5 to 60 cps. The container shall be
fastened, in suitable fashion, to the table of a vibration testing device
producing an essentially sine wave motion. The maximum permissible
motion freedom shall be approximately 1/32 inch. The specimen shall
then be vibrated for 1 hour at the frequency producing maximum trans-
missibility and at an input acceleration of 1 g. This test shall be
applied to each of the three principal orthogonal axes,
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