(2)  
A01023 Sealant, silicon - DC-111

 C. Access
 (1)  Location Zone
 220 Aft Cargo Compartment Equipment Bay

 D. Procedure
 S 642-044
 (1)  
Apply the grease, DOD-G-24650 or sealant DC-111 to the packing and threads of the pressure relief valve.

 S 432-026

 (2)  
Remove the protective cap from the fitting for the pressure relief valve.

 S 422-027
 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.
 (3)  Install the pressure relief valve with a new O-ring.
 NOTE: If it is necessary, use a suitable tool to hold the fitting
____
 when you tighten the valve.

 S 862-029
 (4)  
Pressurize the water tank (AMM 38-41-00/201).

 S 792-030

 (5)  
Make sure there are no air leaks at the connection of the pressure relief valve to the fitting.

 (6)  
Replace the access panel.

 S 412-031
 TASK 38-41-21-702-032
 4. Pressure Relief Valve Test (Fig. 202)
__________________________
 A. Standard Tools and Equipment
 (1)  
Gage - Pressure (0-80 psig |0.5 psig)

 (2)  
Valve - Control (pressure rating 150 psig minimum, 3/8 inch minimum globe type, 15 scfm minimum flow at 50 psid)

 (3)  
Regulator - Pressure (pressure rated for air source, outlet pressure adjustable, zero to 100 psig, 3/8 inch minimum)

 (4)  
Filter Air (in-line type)

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 38-41-21
 ALL  ú ú 01 Page 203 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

PRESSURE RELIEF VALVE

AIR FILTER  ADJUSTABLEPRESSURE REGULATOR (100 PSIG MAXIMUM)
Pressure Relief Valve Test
Figure 202

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 38-41-21
 ALL  ú ú 01 Page 204 ú Mar 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E03113
 B.
C.
D.
A
737-300/400/500MAINTENANCE MANUAL
 (5)
Compressed Air Supply (80 psig, 15 scfm minimum)Reference

 (1)
AMM 38-41-00/201, Water Tank Pressurization SystemAccess

 (1)  
Location Zone 220 Aft Cargo Compartment Equipment Bay

Procedure
 S 022-034
 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.
 (1)  
Do this task: Pressure Relief Valve Removal.

 S 722-035

 (2)  
Do a check of the relief pressure.

 (a)  
Connect these components to a source of compressed air that does not have oil, as shown in Fig. 202. 1) Relief valve 2) Control valve 3) Pressure gage 4) Pressure regulator 5) Air filter

 (b)  
Close the control valve.

 (c)  
With the initial pressure at zero psig, slowly open the pressure regulator.

 (d)  
Look at the pressure gage while you increase pressure.

 (e)  
Keep a record of the initial pressure at which you find airflow or a sudden increase in airflow through the pressure relief valve.

 NOTE: The initial pressure to open the relief valve can be
____ higher as much as 10 percent than the set pressure. The subsequent pressure should be within the normal set range of the relief valve.
 1)  This pressure must be more than 57 psig and less than 75 psig.
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