Patent ID: 8313082
Filing Date: 2012-11-20
Classification: F15B,Y10T

Abstract:
1. An actuator system for positioning a valve or device with a mechanical input comprising: a fluid operated actuator comprising an output coupled to the mechanical input of the valve, a feedback element for mechanically indicating a position of the valve or device, and inputs for actuating fluid, such that fluid at the inputs causes the fluid operated actuator to move in opposing directions; and a mechanical position feedback member coupled to the feedback element of the fluid operated actuator; and an activation fluid valve having 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 control input force comprising a proportional control valve for modulating pilot pressure to a pilot port, the first opposing force input and the second opposing force input being reciprocal to each other such that 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.