Hyundai HX145LCR Manual page 82

(2) (2) RELEASE HOLDING OPERATION RELEASE HOLDING OPERATION
The pilot pressure is supplied to the pilot port for release holding valve and shifts the piston "B" in
the left direction against the spring "B", and shifts the poppet in the left direction through piston
"B" and piston "A" against spring "B" and shifts the spool in the left side.
At same time, the return fluid from actuator returns to the drain port through the periphery hole of
check, crevice of the check and the plug, the periphery hole of the plug, in side of holding valve,
crevice of the poppet and the poppet seat, the periphery hole of the poppet seat, crevice of
socket and spool and internal passage of spool.
When the poppet is opened, pressure of inside of holding valve is decreased and the return fluid
from actuator returns to the tank passage through the notch of spool.
SPRING "A"
PLUG
CHECK
ACTUATOR PORT
CHECK VALVE
POPPET PISTON "A"
POPPET SEAT
2-30
PILOT PISTON CHAMBER
SPRING "B"
PISTON "B"
PILOT PORT
FOR RELEASE
DRAIN PORT
HOLDING VALVE
145LCR2MC16