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reasons:
* Downstream pressure is more than 9th stage pressure
* 9th stage pressure is more than 110 psi.
When downstream pressure is more than 9th stage pressure,
the reverse flow mechanism in the high stage regulator opens
and bleeds off the control pressure to the high stage valve. The
high stage valve then closes.
When 9th stage pressure is more than 110 psi, the pneumatic
shutoff mechanism in the high stage regulator operates. When
the pneumatic shutoff mechanism operates, this occurs:
* 9th stage pressure to the reference pressure regulator is
shut off
* Control pressure to the high stage valve bleeds off
* High stage valve closes.
A relief valve in the high stage valve decreases downstream
pressure in the interstage duct when the pressure regulator and
shutoff valve (PRSOV) is closed.
Operational Controls
The operation of the high stage bleed system is automatic and
self-regulating. There are no external controls.
PNEUMATIC - ENGINE BLEED AIR - HIGH STAGE REGULATOR/VALVE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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PNEUMATIC - ENGINE BLEED AIR - HIGH STAGE REGULATOR/VALVE - FUNCTIONAL DESCRIPTION
PNEUMATIC - ENGINE BLEED AIR - HIGH STAGE REGULATOR/VALVE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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PNEUMATIC - ENGINE BLEED AIR - HIGH STAGE REGULATOR/VALVE - FUNCTIONAL DESCRIPTION
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Purpose
The bleed air regulator (BAR) operates the pressure regulator
and shutoff valve (PRSOV).
The PRSOV controls the flow of bleed air from the engine.
These are the PRSOV control functions:
* Shutoff of engine bleed air
* Pressure regulation of engine bleed air (42 psi nominal)
* Temperature limitation of engine bleed air (450F/232C).
Physical Description
The BAR has these parts:
* Mechanical latching solenoid valve
* Pressure relief valve
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* 180 psi overpressure switch
GUN 001-017, 019-099, 101-118, 201-999
* 220 psi overpressure switch
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* Ports for supply and control air lines.
The PRSOV is a butterfly valve that is spring-loaded closed. The
valve has these parts:
* Pneumatic actuator
* Manual override and position indicator
* Control air port
* Downstream sense port.
Location
The BAR is at the 11:00 position on the engine core area and
immediately aft of the fan frame.
The PRSOV is at the 10:00 position on the engine core area and
below the precooler.
Operation
The BAR has electrical control by signals from these devices:
* Engine BLEED switch (through the ACAU)
* Engine fire switch
* ACAU.
During normal operations, when the engine BLEED switch is set
to ON, a signal goes through the ACAU to command the BAR
solenoid valve to open. When the engine BLEED switch is set to
OFF, a signal goes to command the BAR solenoid valve to
close.
When the fire switch is up, a signal goes directly to the BAR
solenoid valve to close the valve.
Relays in the ACAU control the BAR solenoid valve to close for
these conditions:
* Engine start valve not closed (reverse flow protection)
PNEUMATIC - ENGINE BLEED AIR - BAR AND PRSOV
EFFECTIVITY
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* Engine bleed trip off conditions (490F/254C overheat or 180
psi overpressure protection).
GUN 001-017, 019-099, 101-118, 201-999
* Engine bleed trip off conditions (490F/254C overheat or 220
psi overpressure protection).
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The PRSOV is pneumatically controlled by the BAR.
Training Information Point
The PRSOV has a manual override and position indicator. You
can manually lock the valve in the closed position only.
PNEUMATIC - ENGINE BLEED AIR - BAR AND PRSOV
EFFECTIVITY
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