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The flow control valve is a three-way spool valve, with a preloaded spring, and is supplied by Pc and Pb.
Changes in the position of the bleed valve, due to the position of the torque motor, modulates the  Pc pressure supplied to the Pz cavity and the bottom of the flow control valve.
Pz is opposed by Pb, plus the spring force, and the control valve moves up or down to compensate for pressure changes.
Clearance control regulators operation.
An increase in torque motor current moves the bleed valve down, decreasing the amount of Pc supplied to the Pz cavity. A bleed orifice, between the Pz cavity and the Pb line allows Pz to decrease, causing the flow control valve to move downward and port Pc to the output port.
A decrease in torque motor current moves the bleed valve up, increasing the amount of Pc supplied to the Pz cavity causing Pz to increase. This increase causes the flow control valve to move upward and port Pb to the output port.
The output port is connected to one side of the clearance control actuator and the other side of the actuator is always submitted to Pcr pressure.

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CTC-201-279-01
EFFECTIVITY
73-21-18 Page 47
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
HYDROMECHANICAL UNIT
Burner staging valve solenoid operation.
Controlled by the ECU, the output of the Burner Staging Valve (BSV) is used to turn off half of the 20 fuel nozzles during certain flight conditions.
The BSV is a three-way solenoid valve containing a single ball and two valve seats.
Pc and Pcr pressures are supplied to the input of the valve and one of these inputs supplies the output pressure sent to the BSV port on the HMU.
The solenoid can be energized by applying an electrical current to either of two electrically isolated independent coils.
When the solenoid is de-energized, Pcr is supplied to the BSV. The BSV is open and all 20 nozzles are on.

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CTC-201-280-00
EFFECTIVITY
73-21-18 Page 49
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG

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FUEL FLOW  TRANSMITTER

EFFECTIVITY
73-30-11 Page 1
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL

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FUEL FLOW TRANSMITTER
The purpose of the fuel flow transmitter is to provide the ECU with information, for indicating purposes, on the weight of fuel used for combustion.
Located in the fuel flow path, between the HMU metered fuel discharge port and the fuel nozzle filter, it is installed on supporting brackets on the aft section of the HMU.
　
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