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 B.  Two vent tubes are attached to inboard channels in the main fuel tank and two vent channels are installed to inboard channels in the center fuel tank. The vent tubes supply venting when the outboard fuel vent float valves close. Four float drain valves, two in each vent channel in the center fuel tank, permit trapped fuel in the vent channels to drain back into the center fuel tank. Drain check valves at the low points of all vent tubes prevent fuel accumulation in the vent tubes.
 C.  A surge tank, found at the end of each wing, collects all overflow fuel passed through the vent channels. Two drain check valves permit all overflow fuel to drain back into the main fuel tanks. A vent scoop on the lower wing surface creates a positive pressure during flight. Air flow to the surge tank passes through a vent flame arrestor and through the vent scoop. A pressure relief valve supplies backup venting if the vent flame arrestor becomes plugged.
 2.  Component Details_________________
 A.  Fuel Vent Float Valves (Fig. 2)
 (1)  Two fuel vent float valves permit fuel tank venting while preventing fuel from entering the vent channels. The fuel vent float valve opens and closes corresponding to the fuel level in the main fuel tanks and airplane attitude changes. As the fuel level rises to support the float the fuel vent float valves begin to close. The fuel vent float valves close fully when fuel covers the float. As the fuel level lowers during defueling or normal airplane attitude change, the float is exposed and the fuel vent float valve begins to open. The fuel vent float valve opens fully when no fuel supports the float. A float stop supports the float in its fully open position.
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A
757
MAINTENANCE MANUAL

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VENT CHANNEL
FLOAT DRAIN
VALVE

FLOAT DRAINVALVE
VENT FLAME ARRESTOR
PRESSURE RELIEF VALVE
DRAIN CHECK VALVE
FUEL VENT FLOAT VALVE FUEL VENTFLOAT VALVE
DRAIN CHECK VALVEPRESSURE RELIEF VALVEVENT FLAME ARRESTOR
Fuel Tank Vent System
Figure 1

A

757
MAINTENANCE MANUAL

FLOAT-ACTUATED
VENT VALVE

SEE A
FUEL VENT FLOAT VALVE
SEE B
FLOAT-ACTUATED
VENT VALVE
　
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本文鏈接地址：757 AMM 飛機維護手冊 燃油 CHAPTER 28 - FUEL 2(19)