Hyundai HX145 LCR, Руководство пользователя

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2. 2. BOOM PRIORITY EPPR VALVE BOOM PRIORITY EPPR VALVE
COMPOSITION COMPOSITION
The boom priority EPPR valve is built in a manifold and mainly consisting of valve body and coil.
This EPPR valve installed under the solenoid valve.
CONTROL CONTROL
The boom priority EPPR valve has to be controlled by a specific electronic amplifier card, which is
supplying the coil with a current 580 mA at 30
Ω
and 24 V.
1) 1)
2) 2)
21095MS14
OPERATING PRINCIPLE OPERATING PRINCIPLE
Structure Structure
3) 3)
(1) (1)
1 5
2
4 6
P
A
T
3 Control spool
1 O-ring
2 Support
ring
3 Valve body
4 Coil
5 Connector
6 Cover
cap
Operation Operation
In de-energized mode the inlet port (P) is closed and the outlet port (A) is connected to tank port
(T).
In energized mode the solenoid armature presses onto the control spool with a force
corresponding to the amount of current. This will set a reduced pressure at port A. The setting is
proportional to the amount of current applied.
Maximum pressure relief Maximum pressure relief
If a pressure from outside is applied on port A the valve may directly switch to tank port (T) and
protect the system before overload.
(2) (2)
(3) (3)
P
T
A
P : Pilot supply line
T : Return to tank
A : Secondary pressure to flow MCV