Fluid handling – Systems – Dividing into parallel flow paths with recombining
Reexamination Certificate
2007-11-20
2007-11-20
Hepperle, Stephen M. (Department: 3753)
Fluid handling
Systems
Dividing into parallel flow paths with recombining
C137S512200, C137S513700, C137S517000, C137S543190
Reexamination Certificate
active
11086052
ABSTRACT:
A combination neutral valve and check valve assembly is provided for use in connection with a closed hydraulic circuit and a sump such as in a hydrostatic transmission. A cage and check poppet are mounted in a valve body having an opening between the hydraulic circuit and sump. The check poppet is movable between a first position where it closes the valve opening and a second position where it is disengaged from the opening. A check compression spring is mounted in the cage and biases the poppet to the engaged position. A valve shuttle is located in the check poppet and movable between a first position where it closes a check poppet opening and a second position where it is disengaged from the opening. A neutral valve spring is engaged to the valve shuttle and the check poppet to bias the valve shuttle to the disengaged position.
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Hepperle Stephen M.
Hydro-Gear Limited Partnership
Neal Gerber & Eisenberg LLP
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