Function, Section: Type Z4Wh - Bosch Rexroth Z4WE Serie Manual De Instrucciones

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RE 24753/08.08 Z4WEH; Z4WH Bosch Rexroth AG
Hydraulics

Function, section: Type Z4WH

3.2 3.1
P
2
A
B
1
1
B
2
A
2
TB
2
8 2 1 6
X Y
10
Valves of type Z4WH are directional spool valves with hy-
draulic actuation. They control the start and stop of a flow.
These directional valves basically consist of valve housing
(1), main control spool (2), one or two return springs (3.1) and
(3.2) in the case of valves with spring return or spring center-
ing, as well as pilot oil subplate (10).
Main control spool (2) is operated directly by pressurization.
Main control spool (2) is held by springs in the zero or initial
position. The pilot oil is supplied and drained externally (see
page 12).