Variable-speed actuators

When working in modulating duty, the actuator speed reduces progressively as the valve position approaches the setpoint, giving a significant increase in positioning accuracy. In profile operation, with up to eight pivot points in each direction of travel, automatic speed adjustment ensures rapid travel while minimizing cavitation and pressure surges. Soft start and soft stop allow smooth operation close to the end positions.

Actuator speed can also be controlled externally to take full advantage of additional control variables or algorithms. A further option is absolute speed synchronisation between two actuators.

The new actuators are available in six sizes covering torques up to 1000Nm. Open-close actuators operate within one of two speed ranges: 6-60 and 12-120rpm. Most of the modulating actuators can also operate in the range 24-240rpm.