UFC 3-460-03
21 JANUARY 2003
4.4.2.1. General. A nonsurge/check valve (Figure 4.2) is required in the discharge line of each
deep-well turbine pump to keep the pump surges from damaging downstream equipment and
prevent the reverse flow of fuel through the F/S and pump. Maintenance frequencies are noted in
Chapter 10.
Figure 4.2. Nonsurge/Check Valve (81AF).
4.4.2.2. Valve Setting. Set the valve to open slowly to prevent pressure surges into the F/S and
downstream equipment. The typical setting is about 20 seconds, with a full range of 5 to 60
seconds. To set the valve, turn the CV flow control counter-clockwise to make the valve open
faster and clockwise to open slower.
4.4.3. F/S Control Valve (FSCV) (40AF 2A):
4.4.3.1. General. The FSCV (Figure 4.3) controls the rate of flow through the separator, prevents
reverse flow, and prevents water discharge when the flange float control reaches the high position.
The automatic water drain feature has been disabled except for certain receipt filters where water
in the fuel is a problem. The water shut-off feature (slug valve) stays active.
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