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At low engine speed, when the pressure and temperature of the IP air are too low, the
system bleeds air from the HP stage and maintains it at 36 _+ 4 psi.
An intermediate pressure check valve downstream of the IP port closes to prevent air from
the HP stage from being circulated to the IP stage.
The HP valve closes automatically
- pneumatically
  ~ in case of low upstream pressure
  ~ in case of excessive upstream pressure
- electrically :
when the bleed valve is closed electrically
in case of overpressure upstream of the HP valve with wing anti-ice off, two packs on
and aircraft altitude above 15000 feet~
ECAM INDICATION
CCM ALL
┏━━━━━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━┓
┃I  -~ A318                      ┃PNEUMATIC   ┃1.36.10     P 5   ┃
┃  .-,,.8, ,, ~L,~ A319          ┃            ┃                  ┃
┃ Lli,~ A320                     ┃            ┃                  ┃
┃                                ┃            ┣━━━━┳━━━━┫
┃      A~7-~'M" A321             ┃DESCRIPTION ┃SEQ 001 ┃REV 28  ┃
┃   FLIGHT CREW OPERATING MANUAL ┃            ┃        ┃        ┃
┗━━━━━━━━━━━━━━━━┻━━━━━━┻━━━━┻━━━━┛
PRESSURE REGULATION AND LIMITATION
The bleed valve, which is downstream of the junction of HP and IP ducting, acts as a
shut-off and pressure regulating valve.
It maintains delivery pressure at 44 _+ 4 psi.
Note : Bleed pressure may fluctuate between 40 and 54 psi particularly at high engine
       power (takeoff or climb), This is acceptable as long as it does not cause variations
       in cabin vertical speed,
The bleed valve is fully closed :
- pneumatically :
   ~ if upstream pressure goes below 8 psi
   ~ if there is return flow
- electrically by means of
   ~ the BLEED pushbutton switch (switched OFF)
   ~ the ENG FIRE pushbutton (pushed)
   ~ the Bleed air Monitoring Computer (BMC) in the following cases :
    - overtemperature
    - overpressure
    -leak
    - open starter valve
    - APU bleed being ON.
If pressure regulation fails, the overpressure valve closes when the pressure goes over 85
psi.
TEMPERATURE REGULATION AND LIMITATION
A precooler downstream of the bleed valve regulates the temperature of the bleed air.
The precooler is an air-to-air heat exchanger that uses cooling air bleed from the engine fan
to limit the temperature to 200~ C.
The fan air valve controls fan air flow.
A spring keeps the fan air valve closed in the absence of pressure.
CCM ALL
┏━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━┳━━━━━━━━━━━┓
┃                                ┃                            ┃1.36.10     P 6       ┃
┃                                ┃                            ┣━━━━━┳━━━━━┫
┃I  -~ A318                      ┃I          PNEUDESCRIPTION  ┃SEQ 100 1 ┃I REV 35  ┃
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual5(95)