Table 1. Filter/Separator Controls and Indicators
Manually operated valve that allows air trapped inside the filter/separator to be
Indicates the difference in pressure between the inlet and outlet of the filter/separator in
pounds per square inch differential (PSID). This is used as an indication of the
condition of the filter elements. Clean elements should generate between 2 and 4
PSID. The maximum allowable pressure differential is 15 PSID.
Indicates the water level in the filter sump.
Water Drain Valve
Ball valve that is used to drain water from the filter sump.
Fuel Drain Valve
Ball valve that is used to drain fuel from the vessel.
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