Proportional position feedback hydraulic servo system

Patent No. 8,313,082

Issued: November 20, 2012
Filed: June 11, 2010

Inventors: Garcia; Gary (Geneva, NY), Tyler; Jeff (Newark, NY)
Assignee: G. W. Lisk Company, Inc. (Clifton Springs, NY)


A system for positioning a device such as a valve with a mechanical input using a fluid operated actuator, a mechanical position feedback member coupled to a feedback element of the fluid operated actuator and an activation fluid valve. The fluid operated actuator has an output coupled to the mechanical input of the valve, a feedback element for mechanically indicating a position of the valve, and inputs for actuating fluid, such that fluid at the inputs causes the fluid operated actuator to move in opposing directions. The activation fluid valve has outputs coupled to the inputs of the fluid operated actuator, a first opposing force input coupled to the mechanical position feedback member and a second opposing force input coupled to a control input force. The position of the activation fluid valve is controlled by a balance between the force from the mechanical feedback member and the control input force.

Reference to Related Applications

This application claims one or more inventions which were disclosed in Provisional Application No. 61/186,473, filed Jun. 12, 2009, entitled "PROPORTIONAL POSITION FEEDBACK HYDRAULIC SERVO SYSTEM". The benefit under 35 USC .sctn.119(e) of the United States provisional application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference.


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