Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Reexamination Certificate
2007-04-10
2007-04-10
Hepperle, Stephen M. (Department: 3753)
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
C137S493300, C137S493600, C137S493900, C137S508000
Reexamination Certificate
active
11060836
ABSTRACT:
A valve arrangement in a hydraulic circuit comprises a longitudinal duct3and a transverse duct2. A throttle slide10can be displaced in the direction of the longitudinal duct3. Arranged in the throttle slide10is a valve piston25, by means of which the flow through the hollow throttle slide10can be enabled or blocked. The flow of hydraulic fluid takes place through two groups of passage holes33a,35a, which are arranged in the throttle slide10. The interaction of pressure and flow direction of the hydraulic fluid, and also the restoring force of a slide spring20and a piston spring30, achieves a situation where hydraulic fluid can flow through the valve arrangement in both directions but that a throttling action occurs only when the hydraulic fluid flows from the transfer duct2to the longitudinal duct3under increased pressure.
REFERENCES:
patent: 3432008 (1969-03-01), Henry-Biabaud
patent: 4016903 (1977-04-01), Akashi et al.
patent: 4217927 (1980-08-01), Morita
patent: 4476890 (1984-10-01), Kawasaki et al.
patent: 6105608 (2000-08-01), Katzman
Hepperle Stephen M.
Sauer-Danfoss Inc.
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