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A 737-300/400/500MAINTENANCE MANUAL
 (3)  S 782-036If the initial relief pressure is not in the pressure range that is specified in the above step, replace the pressure relief valve.
 (4)  S 782-037Do a check of the reset pressure of the pressure relief valve as follows: (a) With the pressure at relief pressure, slowly close the pressure regulator. (b) Look at the pressure gage while you decrease pressure. (c) Keep a record of the reset pressure at which you find that airflow stops or the decrease of pressure stops. 1) This pressure must be more than 54 psig.
 (5)  S 782-038If the reset pressure of the relief valve is less than the pressure that is specified in the above step, replace the pressure relief valve.
 (6)  S 782-039Reduce the pressure to zero psig.
 (7)  S 782-040Do a subsequent test of the pressure relief valve. (a) Keep a record of the subsequent pressure at which you find airflow or a sudden increase in airflow through the pressure relief valve. 1) This pressure must be between 57 and 63 psig.
 (8)  S 782-041If the subsequent relief pressure is not in the range that is specified above, replace the pressure relief valve.
 S 422-042

 WARNING: DO NOT TURN THE DEFLECTOR CAP WHEN YOU REMOVE OR INSTALL THE
_______ PRESSURE RELIEF VALVE. THE PRESSURE AT WHICH THE RELIEF VALVE RELEASES PRESSURE CAN CHANGE IF THE DEFLECTOR CAP TURNS. IF THE PRESSURE RELIEF VALVE DOES NOT RELEASE AT THE CORRECT PRESSURE, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (9) Do the task: Pressure Relief Valve Installation.
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A
737-300/400/500MAINTENANCE MANUAL
 PRESSURE REGULATOR - MAINTENANCE PRACTICES
_____________________________________________
 1.  General_______
 A. This procedure contains the following tasks:
 (1)  
A removal of the pressure regulator.

 (2)  
An operational test of the pressure regulator.

 (3)  
An installation of the pressure regulator.

 TASK 38-41-22-002-001
 2.  Pressure Regulator Removal (Fig. 201)_____________________________________
 A. Reference
 (1)  AMM 38-41-00/201, Water Tank Pressurization System
 B. Access
 (1)  Location Zone
 220 Aft Cargo Compartment Equipment Bay

 C. Procedure
 S 862-002
 (1)  
Remove pneumatic power (Ref 36-11-05-6)

 S 012-003

 (2)
Open the circuit breaker and attach a DO-NOT-CLOSE tag.

 S 012-040

 (3)  
Open the water tank fill valve to release the pressure from the potable-water system.

 (4)  
Open the aft cargo door.

 S 012-005

 (5)  
Remove the aft right bulkhead lining from the bulk cargo compartment.

 (6)  
Disconnect the air hose from the pressure regulator.

 S 012-004
 S 022-006
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A

737-300/400/500
MAINTENANCE MANUAL

ASEE PRESSURE REGULATOR 
AIR PRESSURE SUPPLY LINE 
(REF) WATER TANK WATER SERVICE PANEL (REF) 

FWD
A
PRESSURE
REGULATOR

Pressure Regulator Installation
Figure 201

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G38105
A
　
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