Hyundai HDF 50-7S, Service Manual

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6-13
The imbalance of pressure on the inside
as compared to that of the high pressure
port HP, forces the relief valve poppet D
to open and relieve the oil directly to the
low pressure chamber LP in the valve.
D353HS20
D353HS21
The loss of oil behind poppet C, effected
by the opening of pilot poppet E, causes
poppet C to move back and seat against
pilot puppet E. This shuts off the oil flow
to the area behind relief valve poppet D,
and causes a low pressure area
internally.
As anti void
The anti-void unit supplies oil to the high
pressure port HP when cavitation has
occurred. A lower pressure exists in the
port HP compared to the low pressure
chamber LP. The difference between the
effective area of diameter A and G
causes imbalance of the check valve
poppet K which unseats, thus allowing oil
from the low pressure chamber LP to
enter the port HP and fill the void.
HP
K
A
LP
G
7406S6-28(1)
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