TM 55-2090-201-14&P
1-13.
OIL-WATER SEPARATOR OPERATING PRINCIPLES (Continued).
Solids are collected inside the core of the
filter.
Small drops of oil form on the outside of the
filter.
When drops become large enough, they are forced
off the surface by fluid flow.
Oil rises to the top of the vessel.
Air displaced by the rising fluid level is dis-
charged through the air eliminator valve mounted
on the cover of the vessel.
When enough oil has gathered in the first stage
the system operates automatically.
A mini-probe located in the first stage senses
the level of oil.
It then signals electrically.
The first stage solenoid operated oil discharge
valve opens.
At the same time the solenoid operated water
discharge valve closes.
Closing of this valve
supplies the pressure needed to force oil from
the top of the prefilter primary separator.
When enough oil has been discharged to uncover
the mini-probe, the oil discharge valve closes.
At the same time the water discharge valve opens.
Fluid in the bottom of the first stage then
enters the second stage separator.
Fluid flows up through the filter coalescer
element.
This filters any oil that may not
have been removed in the first stage.
Operation and function of the second stage
separator is the same as that of the first stage.
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