Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves
Patent
1992-05-04
1994-10-04
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
Relatively movable serial valves
91448, 91461, 60468, F15B 1108, F16D 3102
Patent
active
053516010
ABSTRACT:
A hydraulic control system in which the flow of hydraulic fluid to and from cylinders on either side of a piston is controlled by normally closed check valves that are opened whenever a control valve is not in its neutral state. Float check valves respectively in series with the check valves and the check valves are opened when the control valve is in a neutral state by pressure from one of the cylinders so as to permit the load to move freely in response to external forces applied to it. A normally closed check valve is provided in which load sense pressures drive it open and pressure from a cylinder is balanced out. A cross check valve is such that the ratio of the areas for driving it open to the area for keeping it shut are at least 35:1.
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Heisig Charles
Zeuner Kenneth W.
Control Concepts Inc.
Look Edward K.
Nguyen Hoang
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