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 D.  The bypass valve allows air to pass through the water separator to the distribution system without first passing through the coalescer bag. The valve opens as a result of increased pressure differential should the coalescer bag become clogged or frozen (Fig. 3 and Fig. 4). The bypass valve opens only when the coalescer bag becomes excessively clogged to allow passage of sufficient air for proper ventilation and cabin pressure. The bypass valve assembly is secured to a mounting ring within the inlet shell assembly.
 E.  The water separator also has a bag condition indicator. As the bag becomes clogged, the pressure applied to the bag condition indicator piston is increased, forcing the disk on the piston shaft toward the red colored window section of the indicator cap. When the disk is positioned within the red colored portion of the cap, it indicates a dirty bag and the bag should be replaced (Fig. 3, detail B and Fig. 4).
 9.  Water Spray Injector____________________
 A.  Water collected by the water separator is drawn to a water spray injector nozzle (Figs. 1, 3, 4 and 6) discharging into the ram air inlet duct upstream of the pack heat exchangers. Air from the air cycle machine turbine inlet is used to force the water through the spray injector.
 B.  An orifice-controlled drain is provided in parallel with the injector to provide overboard drain after pack shutdown.
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A

737-300/400/500MAINTENANCE MANUAL
AUTOAPU/HIGH FLOWFLOW SERVO SERVO
SOLENOID A APU/HIGH FLOW 
REGULATOR PILOT PRESSURE  SOLENOID B AUTO FLOW  PORT SENSE PRESSURE CABIN 
OPEN-CLOSE SOLENOID C  CONTROL MANUAL 
ACTUATOR  CLOSED
OPEN 
FLOW  SENSE PORT UPSTREAM  VALVE  SENSE PORT VENTURI  SENSE PORT DOWNSTREAM 
SWITCH CLOSED LIMIT Figure 2 Pack Valve Schematic 

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737-300/400/500
MAINTENANCE MANUAL

FWD
WATER SEPARATOR
35`F TEMPERATURE SEE ASENSOR
BAG CONDITION 
INDICATOR 
SEE  B 
FWD 
RED AREA 
TO WATER  OVERBOARD 
SPRAY  DRAIN  INDICATOR 
INJECTOR  DISK 
WATER SEPARATOR  BLACK AREA  ... . ....... ............. ............. ......... ......... ......... ........ ........ ...... ..... .... .. . 
A 

FWD  METAL CAL 
BAG CONDITION 
INDICATOR 
B 
Water Separator 
Figure 3 

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737-300/400/500
MAINTENANCE MANUAL

BAG CONDITION INDICATOR  BAG COALESCER  SHELL OUTLET  COLLECTOR 
INLET SHELL 
BYPASS VALVE 
SUPPORT COALESCER  EXTRACTOR BOSS WATER SPRAY  DRAIN ORIFICE 
BYPASS AIRFLOW NORMAL AIRFLOW 
Figure 4 Water Separator Airflow Schematic

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737-300/400/500MAINTENANCE MANUAL
 10. Water Separator 35°F Control System___________________________________
 A.  When cooling requirements are high, the temperature of the air as it leaves the air cycle machine may drop below the freezing point of water. The water separator 35°F control system regulates air temperature into the separator to keep moisture from freezing on the water separator coalescer bag (Fig. 4).
　
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