Control fluid power apparatus and related methods

An control fluid power apparatus for use with fluid control valve comprising:

• a rotary vane actuator having a vane defining a first cavity and a second cavity;
• a first accumulator having a first piston to define a first chamber and a second chamber, the first chamber to receive a control fluid and the second chamber to be fluidly coupled to a process fluid flowing through a process system pipeline, the first chamber being positioned topside the second chamber when the first accumulator is coupled to the control valve such that the second chamber is positioned between the first chamber and the process system pipeline;
• a second accumulator having a second piston to define a third chamber and a fourth chamber, the third chamber to receive the control fluid and the fourth chamber to be fluidly coupled to the process fluid flowing through the process system pipeline, the third chamber being positioned topside the fourth chamber when the second accumulator is coupled to the control valve such that the fourth chamber is positioned between the third chamber and the process system pipeline, the third chamber of the second accumulator to be fluidly coupled to the first chamber of the first accumulator;
• and
• a directional controller to direct fluid flow between the first chamber of the first accumulator and at least one of the first cavity or the second cavity of the actuator.

An control fluid power apparatus for use with a fluid control valve comprising:

• first means for storing energy having a first means for receiving a control fluid and a second means for receiving a process fluid, the first means for receiving the control fluid being positioned above the second means for receiving the process fluid;
• second means for storing energy having a third means for receiving the control fluid and fourth means for receiving the process fluid, the third means for receiving the control fluid being positioned above the fourth means for receiving the process fluid;
• first means for fluidly coupling the first means for receiving the control fluid and the third means for receiving the control fluid to a control fluid supply;
• and
• second means for fluidly coupling the second means for receiving the process fluid and the fourth means for receiving the process fluid to a pipeline of a process system, wherein the second means for receiving the process fluid and the fourth means for receiving the process fluid being positioned above the pipeline when the fluid control valve is coupled to the process system.