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DASSAULT FALCON 900EX EASY SYSTEMS SUMMARY Air Conditioning & Pressurization(12)

时间:2012-01-12 15:51来源:蓝天飞行翻译 作者:公务机

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The negative pressure relief valve allows the outflow valve to open when the external pressure is higher than the cabin internal pressure.

 

Pneumatic emergency outflow valve
The emergency outflow valve is identical to the electro-pneumatic valve and comprises:
-a pneumatic relay,
-an overpressure limitation capsule,
-a cabin altitude limitation capsule,
-a quick-closing electric valve to induce rapid closing for take-off,
-a negative pressure relief valve.
The emergency outflow valve is pneumatically operated. Pneumatic operation is based on pressure difference between controlled and actual cabin pressure as determined by a pneumatic relay.
The control chambers of the two outflow valves interconnect so that in automatic mode the pneumatic valve is slaved to the electro-pneumatic valve, whereas in manual mode the pneumatic valve operates on its own, with the electro-pneumatic valve closed.

OUTFLOW VALVE IN CLOSED POSITION OUTFLOW VALVE IN OPEN POSITION

MAIN AND EMERGENCY OUTFLOW VALVES

 

Vaccum jet pump

The vacuum jet pump produces a flow from a line supplied by No 1 and 2 engines HP bleed air or by the APU bleed air system when the airplane is on ground. The vacuum jet pump provides negative pressure produced by venturi-effect to operate the main and emergency outflow valves during automatic operation and during manual control of the pressurization system.
As the vacuum jet pump is supplied only by engines No 1 and 2 or APU bleed air, when the No 3 engine is used in lieu of the APU on the ground (in case of APU failure), it is not possible to open the outflow valves, neither in automatic nor in manual mode. In that case, it is necessary to maintain the door or the pilot sliding window open as long as the engines No 1 or 2 are not running, in order to avoid inflating the airplane cabin.
PRESSURIZATION SYSTEM OPERATION

Automatic pressurization mode
In automatic mode, the CPC automatically controls cabin altitude and pressurization rate of change according to programmed laws and landing field elevation.
 
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