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2. BOOM PRIORITY EPPR VALVE
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
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
㞦
and 24 V.
1)
2)
21095MS14
OPERATING PRINCIPLE
Structure
3)
(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
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
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)
(3)
P
T
A
P : Pilot supply line
T : Return to tank
A : Secondary pressure to flow MCV
Summary of Contents for HX140L
Page 12: ...SECTION 1 GENERAL SECTION 1 GENERAL Group 1 Safety Hints 1 1 Group 2 Specifications 1 10...
Page 209: ...4 5 MEMORANDUM...
Page 694: ...8 68 125LCR8TM30 Turn casing 1 upside down and remove oil seal 3 using jig 29...
Page 734: ...8 108 Assemble plug 2 Plug NPT1 16 11 EA 17 21078TM68 21078TM69 21078TM70 21078TM71...
Page 756: ...8 130 Remove lock nut 22 and then boot 23 14 36078RL14 2507ARL10...