Bosch Rexroth AG, RE 18303-01/02.2016
4 L5010… (LC04Z) | 4/3 - 4/2 Directional valves
Functional description
Functional description
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5
67
APB(T)(T)
Type L5010
The solenoid operated valves type L 5010 provide 3-way or
4-way fl ow control, usually from port P to either port A or
B, and the consequent fl ow return to T from B or A
respectively.
The valves are composed by a central cast iron body (1)
which mounts on industry standard surfaces where the
fl ow ports and the installation holes are located; the central
body houses the precisely machined directional control
spool (2) which is held in the neutral or initial position by
the return springs (4). One or two solenoids, composed by
a central tube and a surrounding coil (5), are fi tted to the
body at the spool’s ends: when the coils are energized,
their magnetic fi eld develops a force on the oil immersed
mobile plunger incorporated in the tube which pushes the
control spool from the initial position into a shifted position
where oil fl ow is allowed from P to either A or B.
With coils (5) de-energized, the control spool (2) returns to
the central or initial position pushed by the washers (3)
supported by the return springs (4).
The coils (5) are locked on the tube by threaded plastic
nuts (6); the tube incorporates an externally reachable
push rod (7) which can pushed for emergency spool
shifting in case of electric failure.
Type L5010L201_, L5010M201_, L5010N201_
These valves do not have return springs (4) for the
directional control spool (2): the spool can shift between
two positions, driven only by the magnetic force developed
by the two solenoids (5), and, when the solenoids are not
energized, the neutral position of the spool is not defi ned.
The directional control spool holds a specifi c position only
when one of the solenoids is maintained energized.
Type L5010L501_, L5010M501_, L5010N501_
In these valves the directional control spool has two
switched positions, each one with a mechanical detent.
Shifting of the spool’s position is achieved by energizing
one of the solenoids, but it is unnecessary to maintain the
coil energized in order to keep the spool shifted.