757 AMM 飞机维护手册 液压 CHAPTER 29 - HYDRAULIC POWER 1(18)

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 5.  Reservoir Pressurization Module (Fig. 7)
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 A.  This module filters and distributes air from the pneumatic system to the three reservoirs. The module is on the keel beam forward of the main wheel wells. The module includes a filter, two check valves and a manual bleed valve.
 6.  Return Filter Modules (Fig. 8)
_____________________
PRESSURE 
RELIEF VALVE  SUPPORT 
TIEROD 

MOUNTING
BRACKET

SYSTEM RETURN LINE DEPRESSURIZATION VALVE
PTU SUPPLY LINE
PRESSURE SWITCH
EDP AND ACMP
SUPPLY LINE FWD
DRAIN VALVE QUANTITY TRANSMITTER
LEFT SYSTEM RESERVOIR SHOWN (RIGHT SYSTEM SIMILAR)
L and R System Hydraulic Reservoir
Figure 6

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757
MAINTENANCE MANUAL

 A.  The return module in each system filters all fluid returning to the reservoir. The left and right system return modules are in the left and right wheel well forward fairings, respectively. The center system return module is in the aft left wing/body fairing.
 B.  Each module includes a throw-away filter. A differential pressure indicator shows when the filter is blocked. A by-pass valve routes fluid around a blocked filter. A spring-loaded valve in the module prevents fluid draining when the filter element is removed. The module has two check valves to prevent backflow through the filter.
 C.  The center system module also includes a ground power return connector and the system pressure relief valve.
 7.  EDP Pressure/Case Drain Filter Module (Fig. 9)
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PRESSURIZATION  BLEED VALVE 
(3 PLACES) LINE 
 
Reservoir Pressurization Module 
Figure 7 

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757 MAINTENANCE MANUAL
SUPPORT BRACKET
HYDRAULIC
LINES
CHECK VALVE
SYSTEM
PRESSURE
RELIEF VALVE

HYDRAULIC
LINE
　
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