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36-11-00
Page 5
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The 5th stage bleed air check valve prevents 9th stage bleed air
flow into the 5th stage bleed port.
Physical Description
The bleed air check valve is a split-flapper check valve.
Location
The bleed air check valve is part of the engine bleed air
manifold. It is on the left side of the engine high pressure
compressor case.
Functional Description
The valve lets air flow go in the direction of the arrow. It stops
air flow in the opposite direction.
Two semicircular flappers control air flow. Normal airflow
opens the flappers. Reverse airflow closes the flappers.
Training Information Point
Install the bleed air check valve so that the flow arrow points
away from the 5th stage bleed port.
Align the flange clamps correctly and torque to specifications.
Improperly aligned or loose clamps may interfere with engine
components or the inner thrust reverser cowls.
PNEUMATIC - ENGINE BLEED AIR - BLEED AIR CHECK VALVE (5TH STAGE)
EFFECTIVITY
GUN ALL 36-11-00
Page 6
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-11-00-209
PNEUMATIC - ENGINE BLEED AIR - BLEED AIR CHECK VALVE (5TH STAGE)
PNEUMATIC - ENGINE BLEED AIR - BLEED AIR CHECK VALVE (5TH STAGE)
EFFECTIVITY
GUN ALL 36-11-00
Page 7
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-11-00-209
Purpose
The high stage regulator controls the high stage valve.
The high stage valve controls the flow of bleed air from the 9th
stage engine bleed air manifold.
Physical Description
The high stage regulator has these parts:
* Supply pressure port
* Downstream sense port
* Control pressure port
* Reverse flow mechanism
* Pressure regulator mechanism
* Relief valve
* Pneumatic shutoff mechanism.
The high stage valve is a butterfly valve, spring loaded to the
closed position. The valve has these parts:
* Pneumatic actuator
* Valve flow body with direction of flow arrow
* Relief valve
* Manual override and position indicator.
Location
The high stage regulator is on the engine core area at the 10:00
position.
The high stage valve is on the engine core area at the 8:00
position.
Operation
The operation of the high stage regulator is automatic. There
are no operational controls.
The operation of the high stage valve is automatic. Also there is
a manual override to lock the valve in the closed position.
Training Information Point
The high stage regulator and high stage valve can be tested
using external test equipment.
PNEUMATIC - ENGINE BLEED AIR - HIGH STAGE REGULATOR/VALVE
EFFECTIVITY
GUN ALL 36-11-00
Page 8
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-11-00-207
PNEUMATIC - ENGINE BLEED AIR - HIGH STAGE REGULATOR/VALVE
PNEUMATIC - ENGINE BLEED AIR - HIGH STAGE REGULATOR/VALVE
EFFECTIVITY
GUN ALL 36-11-00
Page 9
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-11-00-207
Purpose
The high stage regulator and valve control the supply of high
stage engine bleed air.
The high stage regulator operates the high stage valve.
The high stage valve controls the flow of bleed air from the 9th
stage bleed air manifold.
Functional Description
The high stage regulator gets unregulated air from a tap on the
9th stage bleed air manifold. The unregulated air goes through
the pneumatic shutoff mechanism to the reference pressure
regulator.
The reference pressure regulator decreases the pressure to a
constant control pressure. A relief valve prevents damage to
the high stage valve if the reference pressure regulator fails.
The control pressure from the high stage regulator goes to
chamber A of the high stage valve. The actuator opens the
valve against spring force and pressure in chamber B. The
combination of forces that operate on the actuator cause the
valve to regulate the downstream pressure to 32 psi (nominal).
During normal operation, the high stage valve closes for these
　
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