Supplement Airplane Maintenance Manual
Cessna 172 with TAE 125-02-99 / -114
AMM-20-02
Chapter:
Issue:
Issue Date:
Page:
Content:
20-AMM-73-02
3
06.11.2013
6
10
Rev. No:
Rev. Date:
1
25.08.2014
Pressure Control Valve
The pressure control valve sets the correct pressure in the rail. It
is a solenoid operation valve actuated by FADEC.
The Pressure control valve is provided with a mounting flange for
attachment to the rail and connection to the return fuel system. It
incorporates two control loops:
•
A fast-response mechanical control loop to compensate for
the high-frequency pressure fluctuations. A spring closes
the control valve up to maximum pressure of approximate
100 bar (1450 psi)
•
A slow-response electrical control loop for setting a variable
mean pressure in the rail. If the pressure in the high
pressure circuit has to be increased, the force of the
solenoid must be generated in addition to the spring force.
The forces of the solenoid are proportional to its energizing
current which is pulse width modulated with a frequency of
1 kHz. See Figure 6.
Figure 6 Pressure Control Valve
1
Valve Ball
2
Armature
3
Electromagnet
4
Spring
5
Electrical Connection
1
2
3
4
5
Содержание Cessna 172
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