Bosch VEI-Series User Manual download pdf (Page 3)

RE 18300-54/07.12 EDBZ-VEI

Bosch Rexroth Oil Control S.p.A. 3/8

_ _ C _

=E401

_ _ A _ _ _ D _ _ _ O _

74 1323456

10 9 8

Spool variants

Principles of operation, cross section

The sandwich plate design directional valve elements B8_58…

are very compact direct operated solenoid valves which

control the start, the direction and the leak free stop the oil

flow. These elements basically consist of a stackable housing

(1) with a control spool (2), one solenoid (5), a spring holder

plug (7); two return springs (4); a solenoid screw-in cartridge

VEI (8) with its coil (9).

When energized, the force of the solenoid (5) pushes the

control spool (2) from its rest position “0” to the end position

“b”. If there is a solenoid cartridge VEI (8) type C, A, O, the oil

flow goes directly to the port A; if there is a solenoid cartridge

VEI (8) type D (Dual locking), it is necessary the energize the

solenoid cartridge as well in order to allow the oil flow to the

port A.

Once the solenoid (5) is de-energized, the return spring (4)

pushes the spool thrust washer (3) back against the housing

and the spool (2) returns in its rest position. The leak free

holding at port A is provided by energizing (or de-energizing, if

the VEI is NC type) the solenoid cartridge.

By energizing open the VEI (8) (“C“ and “A“ versions), the A

port is open to tank and downstream flow is possible.

The coils are fastened to the respective solenoids (5) and VEI

(8) by the ring nuts (6) and (10).

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Bosch VEI-Series User Manual Page 3