(3)
The extend (EXT) port is to connect to the extend restrictor tee for the flow control.
(4)
A retract (RET) port connected by a retract restrictor tee to both thrust reverser halves on each engine.
D.
The valve consists of an aluminum body containing a hydraulic spool, spring and a solenoid valve. The spool is spring and hydraulic pressure biased to remain in the stow mode.
E.
When the valve is in the stow mode, the PRESS port is connected to the RET port and the EXT port is connected to the RTN port. The spool is spring biased to the stow position.
F.
When the valve is commanded to deploy mode, the energized solenoid valve ports hydraulic pressure to the deploy side of the spool. This overcomes the spool spring force and moves the spool to connect the PRESS port to both RET and EXT ports.
G.
When the valve is commanded to stow mode, the solenoid valve becomes de-energized, hydraulic pressure to the spool deploy side is cut off and the spool spring moves the spool to stow mode connecting the ports as mentioned above.
4. Synchronous Shaft Locks (Sync Locks)
____________________________________
A. The lower non-locking actuator on each sleeve is equipped with a sync lock. This sync lock is attached to the threaded end of the actuator where the manual drive mechanism was previously attached. The sync lock is equipped with a 0.25 inch square drive that is inserted into the worm gear and flex shaft mechanism of the actuator. A rotor and pin lock inside the sync lock holds the flex shaft in the locked position unless the sync lock is energized. When energized, the solenoid inside the sync lock pulls an armature which, in turn, pulls the two lock pins away from the teeth of a rotor, allowing it and its connected square drive to rotate. Due to the electrical command architecture, the sync lock will unlock prior to hydraulic fluid becoming available to the system.
5. Flow Control Tees
_________________
A. The flow control system is designed to divide and balance hydraulic flow to both reverser halves from the directional control valve.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
78-34-00
ALL ú ú N02 Page 6 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
Directional Control Valve and Flow Control T-Fittings
Figure 2 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ONE-WAY VALVE RESTRICTORS ú
78-34-00
ú ú N03 Page 7 ú Jun 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E87729
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
RETURN RETURN
EXTEND EXTEND
PRESSURE RETRACT PRESSURE RETRACT
SOLENOID VALVE
SOLENOID VALVE
RETRACT MODE SOLENOID EXTEND MODE SOLENOID
DE-ENERGIZED, NORMAL ENERGIZED, OPERATING
DIRECTIONAL CONTROL VALVE
RETURN (RTN)
(TO ISOLATION VALVE)
TO LEFT
AND RIGHT
SLEEVE
CENTER
LOCKING
EXTEND (EXT) HYDRAULIC
ACTUATORS
RETRACT (RET)
PRESSURE
(FROM ISOLATION EXTEND FLOW CONTROL TEE
VALVE)
TO LEFT
DIRECTIONAL CONTROL AND RIGHT
VALVE SLEEVE
UPPER
NON-LOCKING
SOLENOID HYDRAULIC
VALVE ACTUATORS
RETRACT FLOW CONTROL TEEDirectional Control Valve and Flow Control T-Fittings Figure 2 (Sheet 2)
E29605
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ONE-WAY VALVE RESTRICTORS ú
78-34-00
ú ú N03 Page 8 ú Jun 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SEE A DIRECTIONALEXTEND FLOW CONTROL VALVECONTROL TEE
HYDRAULIC
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