(2)  
Only on-ground tank-to-tank fuel transfer is possible. Fueling station controls and the crossfeed valve switchlight on the pilot's overhead panel P5 control tank-to-tank fuel transfer.

 2.  Component Details_________________
 A.  Defuel Valve (Fig. 2)
 (1)  
Description

 (a)  
The defueling valve is a motor actuated butterfly valve. The defueling valve mounts to the rear spar of the center wing fuel tank. The valve body (within the fuel tank) connects to the actuator (outside the fuel tank) by an adapter/shaft. Access to the valve body requires defueling.

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FUELING MANIFOLD
MAIN TANK BOOST
PUMP BYPASS VALVE

DEFUELING VALVE DEFUELINGVALVEMAIN TANK BOOSTPUMP BYPASS VALVE
Defueling System
Figure 1

A
757
MAINTENANCE MANUAL

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A

757
MAINTENANCE MANUAL

ADAPTER PLATE 
ASEE VALVE DEFUELING  ADAPTER SHAFT  ACTUATOR 
HANDLE MANUAL OVERRIDE 
VALVE BODY 
DEFUELING VALVE A 2 REAR SPARUNIVERSAL JOINT 
ADAPTER VALVE 
UNIVERSAL JOINT  ACTUATOR 
MANUAL OVERRIDE HANDLE 
ADAPTER SHAFT 
1 2  PREFERRED ALTERNATE  DEFUELING VALVE A 1 BODY VALVE  REAR SPAR 

Defueling Valve
Figure 2

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A

757 MAINTENANCE MANUAL
 (b)  
The defueling valve square (preferred) actuator has a 28v dc permanent magnet motor, an electrical connector, OPEN - CLOSED limit switches, and a manual override handle. The manual override handle also shows the position of the defueling valve.

 (c)  
The defueling valve round (alternate) actuator has a 28v dc drive motor, an electrical connector, OPEN - CLOSED limit switches, and a manual override handle. The manual override handle also shows the position of the defueling valve.
　
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本文鏈接地址：757 AMM 飛機維護手冊 燃油 CHAPTER 28 - FUEL 4(60)