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The purpose of an air conditioning pack inlet flow valve (pack valve) is to...

  • A

    maintain a constant and sufficient air mass flow to ventilate the cabin.

  • B

    regulate cabin pressure at the maximum cabin pressure differential.

  • C

    regulate cabin pressure to the selected altitude.

  • D

    discharge cabin air to atmosphere if cabin pressure rises above the selected altitude.

Refer to figure.
PACK VALVE
The pack valve is the valve that regulates bleed air from the pneumatic manifold into the air cycle air conditioning system. Also known as the supply shut-off valve, the pack valve opens, closes, and modulates to allow the air cycle air conditioning system to be supplied with a designed volume of hot, pressurized air => maintaining a constant and sufficient air mass flow into the air cycle system to ventilate the cabin.

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