Fluid handling – Line condition change responsive valves – Bi-directional flow valves
Reexamination Certificate
2006-05-16
2008-11-18
Hepperle, Stephen M (Department: 3753)
Fluid handling
Line condition change responsive valves
Bi-directional flow valves
C137S493200, C137S493300, C137S493500, C137S493600, C417S299000
Reexamination Certificate
active
07451780
ABSTRACT:
A valve apparatus is disclosed for use in regulating the flow of fluid between a closed hydraulic loop and a fluid source in a hydraulic circuit, where the valve apparatus provides up to four different functions including a check valve, a neutral valve, a relief valve and a pressure rise rate valve. The apparatus includes a valve seat for selectively permitting fluid communication between the closed hydraulic loop and the fluid source, a sleeve member and a relief poppet in the valve seat, a relief compression spring inside the sleeve and positioned adjacent the relief poppet and the base of the slidable member, a valve guide and an accumulator piston slidably mounted within the valve guide to define an accumulator volume therein.
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Hepperle Stephen M
Hydro-Gear Limited Partnership
Neal Gerber & Eisenberg LLP
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