EFFECTIVITY BEJ ALL 36-11-00
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ENGINE AIR SUPPLY SYSTEM -ENGINE DUCT
Purpose
The engine ducts move the engine bleed air flow from the engine compressor section to the pressure regulating valve (PRSOV).
Location
The engine ducts are on the left and right sides of the engine core. The ducts are below the PRSOV.
EFFECTIVITY BEJ ALL 36-11-00
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D633W101-BEJ Jan 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
ENGINE AIR SUPPLY SYSTEM -ENGINE DUCT
EFFECTIVITY BEJ ALL 36-11-00
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D633W101-BEJ Jan 05/2002
ENGINE AIR SUPPLY SYSTEM -INTERMEDIATE PRESSURE CHECK VALVE
Purpose
The intermediate pressure check valves (IPCV) prevents air in the HP/IP manifold from going into the eighth stage bleed air ports.
Physical Description
The IPCV is a pneumatically-operated check valve. The IPCV has these parts:
*
Valve body
*
Flapper
*
Flapper stop
*
Hinge pin.
The flow direction arrow is part of the valve body.
Location
There are two IPCVs are on each engine. The IPCVs are next to an eighth stage bleed air ports in the engine ducting. The left and right IPCVs are near the top of the engine core forward of the precooler on the left and right sides of the engine.
Functional Description
The flappers hinge around the hinge pin. The flapper stop keeps the flappers from opening too far. Eight stage bleed air pressure and engine manifold pressure control the position of the flappers.
Training Information Point
A male and a female flange prevents the IPCV from incorrect installation. A flow direction arrow on the valve also helps prevent incorrect installation.
EFFECTIVITY BEJ ALL 36-11-00
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ENGINE AIR SUPPLY SYSTEM -INTERMEDIATE PRESSURE CHECK VALVE
EFFECTIVITY BEJ ALL 36-11-00
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D633W101-BEJ Jan 05/2002
ENGINE AIR SUPPLY SYSTEM -HIGH PRESSURE SHUTOFF VALVE / PRESSURE REGULATING & SHUTOFF VALVE
Purpose
The high pressure shutoff valve (HPSOV) controls the direction of flow and the pressure of the bleed air from the high stage of the high pressure compressor.
The pressure regulating and shutoff valves (PRSOV) control the direction of flow and the air pressure to the pneumatic distribution system.
Physical Description
The HPSOV and PRSOV are the same. They are of the spring loaded closed, pneumatically-operated type of valve. The valves have these parts:
*
Pneumatic connector
*
Manual override and position indicator assembly
*
Flow direction arrow
*
Valve body
*
Valve disc
*
Actuator.
The valves do not have any electrical parts.
Location
The HPSOV is on the left side of the engine core at the 9:30 position. The HPSOV is in the engine ducting between the HP duct and the HP/IP manifold downstream of the fifteenth stage bleed air ports.
The PRSOV is on the left side of the engine core above the HPSOV at the 11:45 position. It is between the HP/IP manifold and the precooler.
Training Information Point
Use the manual override and position indicator assembly to lock the valve in the closed position.
Each valve has a flow direction arrow and alignment marks (not shown). The arrow and alignment marks help install the valves correctly. A male flange and a female flange prevent incorrect installation.
EFFECTIVITY BEJ ALL 36-11-00
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D633W101-BEJ Sep 05/2002
ENGINE AIR SUPPLY SYSTEM -HIGH PRESSURE SHUTOFF VALVE / PRESSURE REGULATING & SHUTOFF VALVE
EFFECTIVITY BEJ ALL 36-11-00
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D633W101-BEJ Jan 05/2002
ENGINE AIR SUPPLY SYSTEM -HPSOV/PRSOV -TRAINING INFORMATION POINTS
Purpose
The manual override and position indicator assembly lets you lock the valve closed and lets you see the position of the valve.
Location
The assembly is on the same side of the valve body as the actuator next to the pneumatic connector.
Physical Description
The manual override and position indicator assembly has these parts:
*
Cam follower
*
Vent valve pin
*
Vent valve
*
Position indicator
*
Hex cam
*
OPEN / CLOSED / LOCKED placards.
Functional Description
The position indicator connects through a spline to the same shaft (not shown) as the valve disc. This lets it show you actual valve disc position and is also used to lock the valve disc closed. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 气源 Pneumatic(8)
