MIL-PRF-5636E
shall be applied to the valve inlet (see figure1). This oil pressure shall be maintained for a period
of 15 seconds. The oil pressure at the oil cooler inlet (PB) shall not exceed the proof pressure of
the oil cooler. The valve shall then be subjected to the leakage test specified in 4.6.2.
4.6.6.2 Thermostatic surge devices only. The pressure sensitive devices only test (see 4.6.6.1)
shall be repeated 6 times. The valve and the oil cooler shall be filled with oil at a temperature of
40o +2oF. An oil pressure surge of 400 +5 psi at a temperature not less than 60oF shall be applied
to the valve inlet (see figure 1). This oil pressure shall be maintained for a period of 15seconds.
The oil temperature shall be increased to at least 150oF and circulated through the valve and oil
cooler. This test shall be repeated 100 times. The valve shall then be subjected to the leakage test
specified in 4.6.2.
4.6.7 Endurance of valve. Oil at a temperature of 45o +2oF shall be applied to the valve first in
one direction and then in the reverse direction at an oil pressure to cause the surge device or
combination thermostatic and surge device to open and close. One cycle shall consist of the
device completely opening and closing once. During that part of the cycle when the device is
closed, the oil pressure shall be at least 80 +5 psi. The valve shall be subjected to 10,000 cycles
with the valve oil cooler mounting flange in the horizontal plane, and 10,000 cycles with the
valve oil cooler mounting flange in the vertical plane. The valve shall then be subjected to the
leakage test in 4.6.2.
4.6.8 Fluid temperature.
4.6.8.1 High temperature. The high temperature test shall be conducted 6 times. The oil shall
be circulated through the valve and oil cooler at a temperature of 135o +10oF for petroleum base
oil or 225o +10oF for synthetic base oil 72 hours. The oil pressure at the valve inlet (see figure 1)
shall be maintained at 35 +5 psi. At the end of this period oil at 275o +5oF for petroleum base oil
or 350o +10oF for synthetic base oil shall be circulated through the valve for96 hours. The oil
pressure at the valve inlet shall be maintained at 35 +5 psi, except that 5 time in every 24 hour
period, the oil pressure shall be raised to 100 +5 psi for 5 minutes. Following this, oil at ambient
temperature shall be circulated through the valve for 2 hours at oil pressures from 1 to 100 psi
varying at a constant rate. There shall be no leakage.
4.6.8.2 Low temperature. Following the high temperature test in 4.6.8.1, the valve shall be
soaked for 24 hours at -65o +5oF while filled with oil. While at -65oF, oil pressure of 1 psi, 50 psi,
and 100 psi shall be applied to the valve inlet alternately for at least 10 times. The oil pressure
shall be held for 30 seconds during each test. There shall be no leakage.
4.6.9 Vibration test. The valve shall be installed in a test system with the oil temperature at 225o
+ o
2 F, the rated oil flow as specified in the associated specification, and at the lowest operating oil
pressure at the valve inlet. The valve shall be vibrated for 35 hours along each of three mutually
perpendicular axes. The frequency and amplitude shall be such as to provide an acceleration of
+
10g. During vibration, oil flow shall be applied to the valve first in one direction, then in the
reverse direction to cause the surge device or combination thermostatic and surge device to open
and close. One cycle shall consist of the device completely opening and closing once. During
that part of the cycle when the device is close, the oil pressure shall be at least 80 +5 psi. The
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