The launch of explosion-proof variable-speed actuators
AUMA Riester
This company has launched explosion-proof, variable-speed valve actuators (photo) for use in potentially hazardous environments. The new SAVEx actuators for open-close duty and SARVEx multi-turn actuators for modulating duty, combined with intelligent ACVEx actuator controls, provide full control of motor speed. Variable speed offers significant advantages for challenging valve-control tasks, since it allows the optimum operating speed to be selected for each change of valve position. High positioning accuracy and optimized setpoint control considerably increase the effectiveness of pressure control valves in gas pipelines, for example. Pressure surges and cavitation effects in the pipeline can be avoided by using speed profiles. Actuator speed can also be controlled by an external signal (either 4–20-mA analog or 0–100% digital) to take full advantage of additional control variables or algorithms. A further option is speed synchronization between two actuators. They are available in six sizes, covering torques up to 1,000 Nm. Speed ranges include 6–60 rpm, 12–108 rpm and 24–216 rpm. Hall 8.0, Stand C23 — AUMA Riester GmbH & Co. KG, Müllheim, Germany