Fluid handling – Systems – Multi-way valve unit
Reexamination Certificate
2005-08-02
2009-12-15
Rivell, John (Department: 3753)
Fluid handling
Systems
Multi-way valve unit
C251S129030
Reexamination Certificate
active
07631663
ABSTRACT:
There is disclosed a pilot valve, especially for a servo valve, comprising an actuating motor and a hydraulic preamplifier via which a control pressure difference can be created that acts upon a main slide of a main stage. According to the invention, a blocking mechanism is embodied in the flow path of the control oil. A control duct that is connected, either directly or via a branch, to a control chamber of the main stage can be blocked by manually actuating said blocking mechanism, while the other control duct remains open. The other control duct can be blocked by actuating the blocking mechanism in the opposite direction while the first control duct remains open. A control pressure difference by means of which the main slide can be displaced into a predetermined position can be created manually by actuating said blocking mechanism.
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Moog, “Servoverstellgerate mit mechanischer Betatigung”, Brochure No. D062-900, Jul. 1998.
Rauch Johannes
Rustler Matthias
Bosch Rexroth AG
Boyle Fredrickson , S.C.
Rivell John
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