TM 9-2330-398-10
1-12. PRINCIPLES OF OPERATION (continued).
FILTER/SEPARATOR ASSEMBLY
separator consists of an aluminum tank (1) containing 15 filter elements (5) and five second-stage water stripper
elements(3). Fuel under pressure from the pump enters the filter tank inlet (6) and flows through the 15 filter elements (5),
where solid particles are removed. The fuel then flows through the five second-stage water stripper elements (3), which
further filter out smaller solid particles and coalesce water particles to be collected in the filter sump (7).
Coalescenceisaprocessbywhichmanysmalldropletsoffreewaterinthefuelarecollectedtoformlargerwaterdrops.
These large water drops are then released into the filter sump (7).
AUTOMATIC WATER DRAIN VALVE. Allows water collected in the filter sump (7) to be automatically ejected. The filter
sump (7) has a ball float that will float only in water and not in any type of fuel. As water accumulates in the filter sump ( 7)
a float rises. When the float reaches a certain level, a valve will open in the automatic drain valve (9), allowing pump
pressure to be applied to a diaphragm valve, opening the automatic drain valve (9). Water is then ejected out of the filter
sump (7) through the automatic drain valve (9) While water is being ejected, fuel flow is continued.
MANUAL DRAIN VALVE. Used primarily during cold weather operations. Water accumulated in the filter sump may
freeze. It is important that the manual drain valve (8) on the filter sump be opened after each operation to drain the water
accumulation into suitable container Be sure to close the manual drain valve after draining.
GO-NO-GOFUSES. Each of the five second-stage water stripper elements (3) is equipped with three Go-No-Go fuses (2).
These fuses are fuel contaminant monitoring devices located "downstream" of the second stage. The fuses restrict the
fuel flow when small amounts of water and solid contaminants are present in the fuel stream.
PRESSURE RELIEF VALVE. Automatically opens to relieve internal pressure of filter/separator when pressure exceeds
150 psi (984.2 kPa). Pressure relief valve (4) vents to the atmosphere.
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