FLUID-ACTUATED CONTROLLER CAPABLE OF FEEDBACK REGULATION

摘要

A fluid-actuated controller, comprising a stationary housing having at least a one discrete internal chamber, each at least one discrete internal chamber being in fluid communication with the stationary housing exterior via an inlet opening; and a rotary actuator mounted in the stationary housing for rotary movement relative thereto, the rotary actuator including at least one piston for effecting rotary movement of the rotary actuator in a first direction. Each such piston is movably disposed in a discrete internal chamber, and each piston is movable within its associated internal chamber in response to a predefined increase in fluid pressure to effect rotary movement of the rotary actuator in the first direction.