C.
Fueling Shutoff Valve (Fig. 3)
(1)
Description
(a)
The fueling shutoff valve has two components; the valve, and the actuator. The two components connect through an opening in the rear spar.
(b)
The fueling shutoff valve is a poppet type valve, which connects between the fueling manifold and the fuel tank. The valve body is installed in the fuel tank near the rear spar. Two control ports pass through the spar to connect with passages in the actuator, leading to the actuator control diaphragm. Removal check valves fit in the control ports. Fueling shutoff valve replacement requires defueling.
(c)
The actuator for the fueling shutoff valve is installed out of the fuel tank on the rear spar. The actuator engages with the two valve control ports which protrude through the rear spar. The actuator is held in position by three bolts which screw into threaded holes in the valve mounting studs. The actuator houses a diaphragm, fuel passages for diaphragm control, a solenoid operated pilot valve, valve position switch, and a manual override knob. Actuator replacement does not require defueling.
(2)
Function
(a)
Fueling Shutoff Valve
1) When fuel under pressure enters the valve inlet, fuel pressure and spring tension keep the fueling shutoff valve in its closed position.
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28-21-00
ALL ú ú 01 Page 4 ú May 20/98
A
757
MAINTENANCE MANUAL
CENTER FUEL TANK
RIGHT MAIN
LEFT MAIN FUEL TANK
FUEL TANK
FUELING FUELING
SHUTOFF CENTERLINE SHUTOFF
VALVE AIRPLANE VALVE
SEE A SEE A
A
FUELING SHUTOFF VALVE
ACTUATOR
SOLENOID
COVERPLATE
ELECTRICAL
CONNECTOR
A
REAR SPAR
WET SIDE
MANUAL
DRY SIDE
OVERRIDE KNOB
FUELING SHUTOFF VALVE
REAR SPAR
A
GASKET
B
REMOVAL CHECK VALVE (2 LOCATIONS)
SEE B . .
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.. ...
COVERPLATE .
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...
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ATTACH ..
DIAPHRAGM ...
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SCREWS .
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SEE C
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INLET.
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本文链接地址：757 AMM 飞机维护手册 燃油 CHAPTER 28 - FUEL 2(39)
