Hyundai R 160 LC-3, Service Manual, Page: 55 / 459

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Foot relief valve operation
fp is lower than spring force
Oil from the center bypass valve flows into the tank via orifice(A) of poppet.
Pressure fp generated by orifice(A) is led to the pump, to control the pump delivery flow.
fp is higher than spring force
If a large amount flows due to delayed pump response, etc., and pressure fp reaches the preset
spring force, then the poppet is lifted and functions as a relief valve.
(2)
ڸ
ڹ
Poppet
A
From center
bypass valve
fp To tank passage
Pressure signal
sent out to the pump
Spring
Poppet
A
From center
bypass valve
fp
To tank passage
Pressure signal
sent out to the pump
Spring