The EVA-100 and EVA-200 are multi-featured actuators with the capability to accept analog control signals. The design provides smooth, highly accurate positioning, with positive position-lock when not in motion. These rugged actuators will withstand the most adverse environmental conditions. The EVA-100 and EVA?200 were developed specifically to fit all Research Control Valves including the larger Model 9000 and 9100. Their accurate positioning and high thrust makes them well suited for all research and process applications.