37
Function during compression at low
air spring pressure
The piston is pushed downwards and
damping is determined by the
bottom valve and to a certain extent
by the flow resistance of the piston.
The oil displaced by the piston rod
flows partly via the bottom valve into
the reservoir. 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 low flow
resistance of the PDC valve is low,
the damping force is reduced.
242_070
Function during compression at high
air spring pressure
The control pressure and
consequently the flow resistance of
the PDC valve are high. Most of the oil
(in relation to the control pressure)
must flow through the piston valve,
thereby increasing the damping
force.
Low air spring
pressure
242_069
High air spring
pressure
PDC valve closed
PDC valve open
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