MIL-PRF-5636E
occur until the oil temperature reaches the valve opening temperature rating. The oil pressure at
the oil cooler inlet (PB) shall not exceed the oil cooler proof pressure. The oil temperature shall
be decreased until oil starts to flow through the bypass passage. This shall not occur until the oil
temperature reaches the valve closing temperature rating.
4.6.3.1 Endurance of thermostatic device. The valve shall be immersed in oil hot enough to
cause the thermostatic device to fully activate. It shall remain in the fully activated position for at
least 1 minute. The valve shall be removed from the oil until the thermostatic device has fully
inactivated. It shall remain in the fully inactivated position for at least 1 minute. One cycle shall
consist of the device completely activating and inactivating once. This shall be repeated 10,000
times. The valve shall then be subjected to the temperature regulation test.
4.6.4 Pressure relief. With the valve bypass closed, oil shall be applied to the valve inlet at rated
oil temperature and circulated through the valve at the maximum continuous oil flow capacity.
Oil flow into the valve from the oil cooler outlet shall be gradually restricted. The minimum oil
pressure drop PB - PD (see figure 1) required to start oil flow through the bypass passage of the
valve shall be as specified in the associated specification. With the oil cooler outlet closed, the
oil pressure drop PB - PD shall not exceed the maximum oil pressure drop.
4.6.5 Surge protection. All air shall be eliminated from the system.
4.6.5.1 Viscous oil surge. The valve and oil cooler shall be filled with oil and then chilled to 10o
+ o
2 F. An oil 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 15 seconds. The oil
pressure at the oil cooler inlet 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.
4.6.5.2 Twice the oil cooler proof pressure oil surge. If the valve has a combined temperature
control and surge protection device, isolate any thermal effect on the temperature control device.
Oil at a temperature of 45o +2oF and at twice the oil cooler proof pressure shall be applied to the
valve inlet (see figure 1). The oil pressure shall be maintained for a period of 15 seconds. The oil
pressure at the oil cooler inlet 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.
4.6.5.3 Hot oil surge. Oil at a temperature of 225o +2oF for petroleum base oil or 300o +10oF for
synthetic base oil shall be circulated through the valve and oil cooler. Gradually restrict the oil
flow at the oil cooler inlet (see figure 1) until the maximum continuous oil flow capacity is
established from the valve outlet. Oil shall not start to flow through the bypass passage of the
valve until the minimum oil pressure drop, as specified in the associated specification is reached.
The oil pressure at the oil cooler inlet shall not exceed the proof pressure of the oil cooler.
4.6.6 Endurance test of surge device. The surge device shall be subjected to 100-cycle
endurance test. One cycle shall consist of the following for each applicable surge device.
4.6.6.1 Pressure sensitive surge devices only. The valve and oil cooler shall be filled with oil at
a temperature of -65o +5oF. An oil pressure surge of 400 +5 psi at a temperature not less than 60oF
7
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business