Temperature, contaminates and other factors have no impact on the unit's calibration. Once calibrated, the electric control valve actuator can operate for months, even years, without adjustment. Work in harsh environments and get little or no recognition. But their impact on power plant efficiency can be significant. Valves and actuators are critical in almost every aspect of single board computer. They are used in a wide range of applications, including pollution control, feed water, cooling water, chemical treatment, bottom ash and steam turbine control embedded systems. They are exposed to a variety of chemicals, abrasive materials and very high temperatures. They are critical in optimizing efficiency, and they are often the final control element in the operation of a power plant. Electric Actuators and Rotork has a line of all-electric, compact modulating actuators known as the Continuous Duty Modulating Failsafe Electric Actuator. The technology Rotork CVA is suited for almost all linear, quarter-turn control valve applications requiring precise position control and continuous modulation. "There are applications where they need to move continuously," Said Pete Kundin, general manager of Rotork's Eastern U.S. Business Unit.
refer to: http://www.power-eng.com/articles/print/volume-117/issue-8/features/opportunities-to-improve-efficiency.html
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