Linear and Rotary Actuators position final elements in control loops, such as air or flue dampers, fuel and feedwater control valves, stoker speed and variable speed drive levers. They are used in the control of boilers, incinerators, curing ovens, dryers, spray booths, evaporators, and other combustion and process applications. Regulators have, in addition to the actuator components, sensing and responding capabilities. They are a complete, fully integrated firing rate or draft control system in a single compact actuator housing.