Fluid handling – Systems – Multi-way valve unit
Reexamination Certificate
2006-02-07
2006-02-07
Krishnamurthy, Ramesh (Department: 3753)
Fluid handling
Systems
Multi-way valve unit
C137S596130, C091S446000
Reexamination Certificate
active
06994116
ABSTRACT:
A directional control valve for a hydraulic load has, in a piston bore of a valve housing, a control piston which can be displaced axially in opposite directions from a central position and which has first fine control grooves for opening a connection between a load chamber and a feed chamber. There are second fine control grooves for opening a connection between a load chamber and a discharge chamber of the piston bore under control. In its central position, there is a restricted relief connection from a load chamber to the discharge chamber via the control piston. The restricted relief connection is obtained via a recess in the control piston, independently of the second fine control grooves.
REFERENCES:
patent: 3212522 (1965-10-01), Williams
patent: 4051868 (1977-10-01), Andersen
patent: 4355660 (1982-10-01), Huffman
patent: 4981159 (1991-01-01), Christensen et al.
patent: 3841507 (1989-06-01), None
patent: 3802672 (1989-08-01), None
patent: 4413216 (1995-10-01), None
patent: 19800720 (1999-07-01), None
patent: 19948232 (2001-01-01), None
patent: 0638730 (1995-02-01), None
patent: 0786598 (1997-07-01), None
patent: 1108895 (2001-06-01), None
Data Sheet RD 64 282/10.99 of applicant Mannesmann Rexroth.
Bosch Rexroth AG
Farber Martin A.
Krishnamurthy Ramesh
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