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____ bottom. The manual reset knob and the stem extend below the poppet. When the valve is closed, the outer surface of the poppet is level with the access panel and the skin surface (Fig. 401). The reset knob is also level with the access panel and the skin surface when the valve is closed.
 1)  Put the end of a tube into one of the three pressure holes in the outer surface of the relief valve (Fig. 402).
 NOTE: The usual type of plastic straw that is used to
____ drink a beverage is sufficient for this function.
 2)  Hold your fingers tightly on the other two pressure holes.
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A 737-300/400/500MAINTENANCE MANUAL
MANUAL MANUAL

SURGE TANK ACCESS SURGE TANK ACCESS PANEL (NO. 13) PANEL (NO. 13)
PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE (KNOB TYPE) (T-HANDLE TYPE) (VALVE CLOSED POSITION) (VALVE CLOSED POSITION)
Surge Tank Flame Arrester Pressure Relief Valve Position Identification
Figure 401

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A
737-300/400/500MAINTENANCE MANUAL
 3)  Blow into the tube with sufficient force to open the relief valve.
 NOTE: You can also use an air pressure source with a
____ maximum limit of 1.0 psi to pressurize the pressure hole.
 4) Blow into the tube until the relief valve opens.
 NOTE: The valve makes a sudden click that you can hear
____ when it opens.
 (b)  PRESSURE RELIEF VALVE WITH THE T-HANDLE TYPE OF RESET; Do these steps to open the pressure relief valve: 1) Put a round rod with a diameter less than 0.415 inch (10.54
 millimeters) into the pressure sense hole in the center of the T-handle. 2) Apply a moderate force to the rod to simulate the pressure differential necessary to open the pressure relief valve.
 NOTE: The valve makes a sudden click that you can hear
____ when it opens.
 S 014-005
 (6)  
Remove the surge tank access panel No. 13, 7101L or 7501R, from the surge tank (AMM 28-11-11/401).

 S 024-026

 (7)  
Remove the pressure relief valve from the access panel.

 (a)  
Remove the eight mounting screws that attach the relief valve to the access panel (Fig. 402).

 (b)  
Remove the relief valve from the access panel.

 (c)  
Remove the O-ring seal from the flange groove.

 (d)  
Discard the O-ring seal.

 

 TASK 28-13-41-404-010
 3.  Pressure Relief Valve Installation (Fig. 402)
__________________________________
 A.  Equipment
 (1) Rod, metal or non-metal- 0.415 inch (10.54 millimeter) diameter
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A 737-300/400/500MAINTENANCE MANUAL
MOUNTING MOUNTING SCREW SCREW
O-RING (8 LOCATIONS) O-RING (8 LOCATIONS)

O-RING
A-A
Surge Tank Flame Arrester Pressure Relief Valve Installation
Figure 402

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 B.
C.
D.
E.
A
737-300/400/500MAINTENANCE MANUAL
　
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