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MIL-V-19069B
held constant.  A manometer connected across the check valve may be used for
accurate measurement of the pressure drop-  The pressure drop shall not exceed
the values specified in table IV.
4.5.8.1 Low temperature functioning.  The valve shall be connected to a
static head of one to three feet of hydraulic fluid in the reverse-flow direc-
tion.  This arrangement shall be maintained at a temperature not warmer than
0
-65 F for a period of four hours. After this period, the valve poppet shall
be mechanically actuated ten times. After the tenth actuation, the leakage
0
inspection shall be performed at -65 F and the requirements therein shall be
satisfied.  Operational inspection (checking time and cracking pressure) shall
0
then be performed at -65 F and the requirements of those inspections shall be
satisfied.
4.5.8.2 Rapid warmup.  The low temperature setup shall be rapidly warmed
0
until the fluid temperature reaches 275 F.  While the temperature is being
0
raised, the valve poppet shall be mechanically actuated at approximate 70 F
increments of fluid temperature rise to determine satisfactory operation
throughout the temperature range.
hydraulic fluid on the valve in the reverse-flow direction, the poppet shall
be mechanically actuated ten times,  After the tenth actuation, the leakage
inspection shall be conducted and the requirements therein shall be satis-
fied.  Operational inspections (checking time and cracking pressure) shall
then be performed, and the requirements therein shall be satisfied.
cycles of operation at a rate of 35 + 5 cycles per minute.  Each cycle shall
consist of flow through the valve atthe rated flow capacity for the valve
size, followed by a reversal of the direction of flow and application of the
maximum rated pressure. Of the total number of cycles, 12,500 shall be per-
formed in accordance with the procedure outlined herein for high temperature
cycling. The remaining 37,500 cycles shall be performed in accordance with
the procedure outlined herein for intermediate temperature cycling. Surge
8

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