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 2.  Safety Relief Valves (Fig. 2)____________________
 A.  Two safety relief valves acting independently of each other and all other systems prevent the cabin-to-ambient pressure differential from exceeding
 8.50 psi.
 B.  Each valve consists of a poppet valve, control chamber, and a spring-loaded diaphragm operated sensor control for controlling the valve opening. The control chamber is vented to the cabin, but has a restrictor in the vent for limiting cabin air inflow. A filter is also installed to prevent contamination in the control chamber. Another passage vents to ambient through the diaphragm operated sensor control poppet.
 C.  The sensor control is separated by a diaphragm. One side of the diaphragm senses cabin pressure while the other side senses ambient pressure. A differential pressure of 8.50 psi will cause the poppet to unseat opening a vent from the control chamber to ambient. This venting of the control chamber reduces the pressure within the chamber.
 D.  The valve gate, with control chamber pressure on one side will cause the gate to unseat at approximately 8.50-psi differential pressure as a result of cabin pressure on the other side of the valve gate. The diaphragm operated sensor control ensures that cabin-to-ambient differential pressure does not exceed 8.50 psi.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
BLOWOUT
PANELS

SEE B
PRESSURE 
SEE  A  BLOWOUT PANEL  EQUALIZATION VALVE 
SEE  C 
FWD 

FORWARD CARGO COMPARTMENT
SAFETY
A
PRESSURE AND RELIEF RELIEF VALVE VALVES
PASSENGER CABIN FLOOR
PRESSURE EQUALIZATION VALVE
SEE C CARGO COMPARTMENT LINING
BLOWOUT
PANELS
FWD
AFT CARGO COMPARTMENT
B
FLAPPERS
FWD C
Pressurization Relief Valves Location Figure 1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

PEDESTAL
AND DISCHARGE PORT
A-A

Safety Relief Valve Schematic
Figure 2

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 3.
4.

5.

A
737-300/400/500MAINTENANCE MANUAL
 E.  The safety relief valves are installed under the fuselage approximately below the aft right service door. One safety relief valve is installed on each side of the outflow valve.
Pressure and Relief Valve
_________________________
 A.  The pressure and relief valve prevents a negative pressure differential from becoming great enough to damage the airplane. The valve consists of a spring-loaded door which relieves automatically at a negative pressure differential. The valve is located forward and above the upper safety relief valve (Fig. 1).
Pressure Equalization Valves
____________________________
 A.  An equalization valve is provided at the aft bulkhead of each cargo compartment (Fig. 1). These valves keep the pressure in the cargo compartments and the cavities surrounding them at approximately the same pressure should the cabin pressure vary.
 B.  Each equalization valve contains two valve flappers. One flapper hinges away from the cargo compartment and the other hinges toward the cargo compartment. Each valve is accessible from within the cargo compartment where it is installed.
Blowout Panels
______________
 A.  Three blowout panels are located in the forward cargo compartment and two are located in the aft cargo compartment. These panels are designed to maintain isolation of the cargo compartments during normal service but will blow out to protect structure at a differential pressure of approximately 1 psi.
　
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