MIL-DTL-9370E
through the relief valve. The pressure regulating valve shall then be quickly released. There
shall be no chatter in the valve.
4.6.6 Response time. A buzzer shall be installed as specified in 4.5.4.1 and a tank
connected as specified in 4.5.4.2 during this test. A source of pressurized gas shall be connected
to the inlet connection and the pressure increased to and maintained at 100 psig. A mercury
manometer shall be connected to the outlet. An acceleration force of 6g shall be applied to the
valve for 30 seconds. The lapse time between application of the force and the time the outlet
pressure becomes the value specified for 6g and shall be recorded. The acceleration force shall
be reduced to 1g. The lapse time between the reduction to 1g force and the time the outlet
pressure becomes zero and shall be recorded. An acceleration force of 10g shall be applied. The
lapse time between application of the force and the outlet pressure becomes the value specified
for 10g and shall be recorded. The acceleration force shall be reduced to 1g. The lapse time
between the reduction to 1g force and the time the outlet pressure becomes zero shall be
recorded. The lapse time between application of the force and obtaining outlet pressure shall be
as specified in 3.5.5.
4.6.7 High temperature exposure. The pressure regulating valve shall be conditioned at a
temperature of 160 + 5 °F for 8 hours. After this period, the valve shall then be subjected to and
pass the tests specified in 4.6.2, 4.6.3, and 4.6.4.
4.6.8 Low temperature exposure. The pressure regulating valve shall be conditioned at a
temperature of - 65 + 5 °F for 3 hours. After this period, the valve shall be returned to room
temperature and shall then be subjected to and pass the tests specified in 4.6.2, 4.6.3, and 4.6.4.
4.6.9 Random vibration. The valve shall be subjected to an inlet pressure of 300 psi and
random vibration shall be applied to each of three mutually perpendicular axes of the unit while
maintaining the valve in an upright (button-up) position. When using manual equalization, the
random vibration shall be applied at 20 percent of test values for sufficient time to adjust the
filters. The equalized frequency spectrum shall be continuous and uniform within + 3 decibels
over the frequency range of 20 to 2,000 cycles per second (cps) as determined by analysis using
a bandwidth of 25 cps or less (and a sufficient sweep speed and appropriate averaging for
constant and accurate analysis, if applicable). Random vibration at (0.05g)2/cps over the 20 to
2,000 cps bandwidth (10g root mean square (rms) overall) having Gaussian distribution and a
peak to rms g ratio of 3 to 1 shall be applied to the equipment for a period of 10 minutes on each
axis. There shall be no damage to the valve, and the valve shall not fail to function as a result of
this test. Upon completion of this test, the valve shall be subjected to and pass the tests specified
in 4.6.2, 4.6.3, and 4.6.4.
4.6.10 Endurance. A tank shall be connected as specified in 4.5.4.2 during this test. A
source of pressurized gas shall be connected to the inlet, and the valve shall be subjected to the
cyclic operations for the number of cycles under the conditions and in the order specified in table
IV. A cycle shall consist of varying the force on the valve from the maximum specified for the
11
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business