Hunter Engineering Company

Nicholas Colarelli

Michael A Olsen

Paul W Roloff

A hydraulic control circuit comprises a power unit, a central processing unit, at least one feedback sensor, a valve manifold, and two or more hydraulic lifting cylinders interconnected with miscellaneous hydraulic hoses and electrical wiring. Basic lifting is regulated by a flow divider unit configured to distribute a flow of pressurized hydraulic fluid pumped from a fluid reservoir through the valve manifold to each of the lifting cylinders during a lifting operation. To compensate for any imbalance between the lifting cylinders, the central processing unit monitors the movement of the lifting cylinders, and is configured to divert, through a three-way valve in the valve manifold, an additional portion of the pressurized fluid flow to a lagging lifting cylinder. During decent operations, the central processing unit extracts an additional portion of the fluid return flow through the three-way valve from a lagging lift cylinder, such that at all times during either lifting or decent operations, each lifting cylinder and a supported runway are disposed in a substantially parallel configuration.

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Creve Coeur, MO, United States of America

Nicholas Colarelli