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AssigneeHUSCO International, Inc.
InventorsJoseph L. Pfaff, Dwight B. Stephenson
Estimating the term…
A system for simultaneously operating first and second hydraulic cylinders has an inlet node for connection to a source of pressurized fluid and an outlet node for connection to a tank. A two-position, three-way primary control valve has a first port connected to the inlet node, a second port connected to the outlet node, and a common port. A first electrohydraulic proportional valve connects the common port to a first port of the first cylinder, and a second electrohydraulic proportional valve connects the common port to a first port of the second cylinder. A third electrohydraulic proportional valve connects the inlet node to a second port of the first cylinder and a second port of the second cylinder. Selectively operating the primary control valve and one of the third and fourth electrohydraulic proportional valves determines the direction in which the first and second cylinders move. Operation of the first and second electrohydraulic proportional valves meters hydraulic fluid to or from the first and second cylinders to control the rate of that movement.
A hydraulic system for operating first and second actuators each having first and second ports, said hydraulic system comprising:
A hydraulic system for operating first and second actuators each having first and second ports, said hydraulic system comprising:
A hydraulic system for operating first and second cylinders each having first and second ports, said hydraulic system comprising:
Dependencies are inferred from the claim text.