Hyundai R 160 LC-3, Service Manual, Page: 69 / 459

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When the plunger is in operation(5Pi pilot signal : OFF)
If Pv is higher than Pc(In the case of boom raise)
When the plunger moves to right, the high pressure oil enters to chamber(3).
Therefore, the pressure of chamber(1) becomes Pc as it is connected to chamber(2) via
orifice(4) ; Poppet(B) is opened by pressure(Pv) of chamber(3) ; Oil from high pressure feed
passage flows into the cylinder head side.
ڹ
Ϧ
1
3(Pv)
2(Pc)
4
5Pi
Pilot signal port
dr4
Bb1
To boom
cylinder head
Tank passage
High pressure
feed passage
Spool(A)
Poppet(B)
d1
d2