Hyundai HX145LCR Manual page 81

4) 4) HOLDING VALVE OPERATION HOLDING VALVE OPERATION
(1) (1) HOLDING OPERATION HOLDING OPERATION
At neutral condition, the pilot piston chamber is connected to drain port through the pilot port.
And the piston "B" is supported with spring "B".
Also, the pressured fluid from actuator entered to inside of the holding valve through the
periphery hole of check, crevice of the check and the plug and the periphery hole of plug.
Then, this pressured oil pushed the poppet to the poppet seat and the check to the seat of body.
So the hydraulic fluid from actuator is not escaped and the actuator is not moved.
SPRING "A"
PLUG
CHECK
ACTUATOR PORT
CHECK VALVE
POPPET PISTON "A"
POPPET SEAT
2-29
PILOT PISTON CHAMBER
SPRING "B"
PISTON "B"
PILOT PORT
FOR RELEASE
DRAIN PORT
HOLDING VALVE
145LCR2MC15