Fluid handling – Processes – Cleaning – repairing – or assembling
Reexamination Certificate
2006-08-22
2006-08-22
Krishnamurthy, Ramesh (Department: 3753)
Fluid handling
Processes
Cleaning, repairing, or assembling
C137S625620, C137S625630, C137S625690
Reexamination Certificate
active
07093607
ABSTRACT:
A servovalve has a sleeve having both a first metering aperture and a second metering aperture in fluid communication with a single port cavity defined by the servovalve. A spool oriented within the sleeve has a first land and a second land and defines a channel oriented between the first land and the second land. When the spool orients in a null position within the sleeve, the first land overlaps the first metering aperture and the second land overlaps the second metering aperture. As a low viscosity fluid within the servovalve assembly leaks across the first land and enters the channel, the overlap of the first and second lands with the first and second metering apertures minimizes flow of the fluid from the channel into the port cavity associated with the metering apertures. The configuration of the sleeve assembly, therefore, maintains a relatively large pressure gain within the servovalve assembly.
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Lewis Torin
Olson Ronald
Rodriguez Mario Armando
BainwoodHuang
HR Textron Inc.
Huang, Esq. David E.
Krishnamurthy Ramesh
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