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Variable Stator Vane (VSV) and Variable Bleed Valve (VBV) flow regulators.
The VSV and VBV flow regulators are identical.
Each regulator contains a servo valve torque motor, a first stage pilot valve and a second stage flow control valve.
The torque motor can be driven by energizing either of two electrically isolated, independent coils that are attached to it.
The pilot valve is a three-way spool valve, directly coupled to the torque motor and cannot rotate due to an anti-rotation arm. The pilot valve is inside the flow control valve and is positioned depending on torque motor current.
The pilot valve has 2 control ports located in the flow control valve. The control valve rotates and is hydraulically coupled to the pilot valve.
Any changes in the position of the pilot valve due to the position of the torque motor, result in changes in the output pressure (Pz), which modifies the position of the flow control valve.
VSV and VBV flow control valve operation.
The pilot valve is supplied with Pc and Pb pressures. The pilot valve’s regulated output pressure (Pz) is applied to the upper end of the flow control valve and is opposed by Pcr pressure applied to the lower end.
Increasing torque motor current displaces the pilot valve downward and ports Pc to Pz. Pz then becomes greater than Pcr and the flow control valve moves downward.
Psf and Pb are supplied to the flow control valve. The two outputs are connected to the VSV head and rod ports or to the VBV open and close ports.
Downward movement of the flow control valve ports Psf pressure to the head end of the VSV actuator which closes the VSV’s, and to the VBV gear motor which closes the VBV’s.
The flow control valve rotates constantly to reduce hysteresis, thus increasing the flow regulators positioning accuracy.
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CTC-201-278-00
EFFECTIVITY ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION
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73-21-18 Page 45
ENGINE SYSTEMS Jan 03
CFM56-5B TRAINING MANUAL
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HYDROMECHANICAL UNIT
Clearance control servo flow regulators system.
The flow regulators system consists of :
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High Pressure Turbine Active Clearance Control (HPTACC)
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Low Pressure Turbine Active Clearance Control (LPTACC)
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Transient Bleed Valve (TBV).
These three regulators are identical.
Unlike the VSV and VBV flow regulators, the clearance control regulators contain non-rotating pilot valve plungers. Each regulator contains a servo valve torque motor, a first stage bleed valve, and a second stage flow control valve.
The bleed valve is suspended from spring blades and directly coupled to the torque motor. The seat of the bleed valve is in the flow control valve.
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