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 B.  The transfer valve consists of a valve body installed in the fuel transfer line, an electric motor-driven actuator installed on the aft side of the rear spar, and an adapter/shaft assembly connecting the actuator with the valve body.
 C.  The actuator consists of a dc electric motor, gear train, limit switches, and a manual override handle, which also serves as a position indicator for the valve. The actuator is readily replaceable without disturbing the fuel seals for the valve and without defueling the tank.
 D.  The valve body consists of a valve housing, rotating-type valve disk, tubing connections, and a splined universal connector for receiving the shaft from the adapter/shaft assembly. Thermal relief is incorporated on each side of the valve disk that relieves line-to-tank only and not across the element.
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A
747-400
MAINTENANCE MANUAL

NO. 3 RESERVE TANK
TRANSFER VALVE

SEE C
MAIN TANK TRANSFER VALVE
SEE A
NO. 2 RESERVE TANK TRANSFER VALVE
SEE B
MAIN TANK TRANSFER VALVE
SEE A
UNIVERSAL JOINT (2 LOCATIONS)
VALVE BODY
ADAPTER
PLATE
ADAPTER REAR SPAR
SHAFT
MANUAL OVERRIDE HANDLE
INLET
ACTUATOR
OUTLET
TANK END RIB FWD INBD
A
Reserve and Main Tank Interconnection - Component Location
Figure 1 (Sheet 1)

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INLET
A
747-400
MAINTENANCE MANUAL

VALVE  ADAPTER 
BODY  TO  PLATE 
OUTLET 

UNIVERSAL JOINT (2 PLACES)  ADAPTER SHAFT  ACTUATOR 
MANUAL OVERRIDE HANDLE 
FWD  INBD 
B 
VALVE BODY  FROM INLET  ADAPTER PLATE  REAR SPAR 

TO 
OUTLET  UNIVERSAL JOINT  ACTUATOR 
(2 PLACES)  ADAPTER 
SHAFT 

FWD
MANUAL OVERRIDE HANDLE
INBD
C
Reserve and Main Tank Interconnection Component Location Figure 1 (Sheet 2)
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747-400
MAINTENANCE MANUAL

 C11356
Figure 1 (Sheet 3)
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747-400
MAINTENANCE MANUAL

 E.  The adapter/shaft assembly consists of an adapter plate, universal joint, and a shaft. The adapter plate is attached to the spar web and contains the necessary seals, bearings, and provisions for installation of the actuator. The shaft is attached to the adapter plate with a universal joint to provide for misalignment between the actuator and the valve. The valve end of the shaft contains a splined indexed slip joint for proper alignment.
 F.  NO. 3 RESERVE TANK TRANSFER VALVES; The No. 3 reserve tank transfer valves are installed differently. The valve operates in an opposite direction compared with all of the other valves in the fuel system. This different installation is necessary because ice can build-up in the transfer line outboard of the reserve tank valves. Because of the installation change, the No. 3 reserve tank valves open in an inboard direction. Any ice in the transfer line will not block valve rotation.
　
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