36
Principles of air suspension
Function during rebound at low air
spring pressure
The piston is drawn upwards, part of
the oil flows through the piston valve,
the remainder flows through the bore
holes in working chamber 1 to the
PDC valve. As the control pressure (air
spring pressure) and consequently
the flow resistance of the PDC valve is
low, the damping force is reduced.
242_052
242_051
Function during rebound at high air
spring pressure
The control pressure and
consequently the flow resistance of
the PDC valve is high. Most of the oil
(depending on the control pressure)
is forced to flow through the piston
valve, thereby increasing the
damping force.
Low air spring
pressure
High air spring
pressure
PDC valve open
PDC valve closed
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