Multi-turn actuators
Multi-turn actuators turn the valve stem through many revolutions. They operate gate valves, globe valves, sluice gates and other valves with a rising or non-rising stem. AUMA's SA range is a widely used example, covering a broad torque range for open-close and modulating duty.
Part-turn actuators
Part-turn actuators move the valve through about 90°. They operate butterfly, ball and plug valves and dampers. AUMA's SQ range is designed for this duty. For higher torques, a multi-turn actuator is combined with a part-turn worm gearbox (for example AUMA SA with GS).
Comparison
| Multi-turn | Part-turn | |
|---|---|---|
| Valve types | Gate, globe, sluice gates | Butterfly, ball, plug, dampers |
| Movement | Many revolutions | About 90° |
| Sizing data | Torque, thrust, stem details, number of turns, operating time | Torque, swing angle, operating time |
| High-torque option | Bevel or spur gearboxes | Multi-turn actuator + part-turn gearbox |
Open-close or modulating?
Open-close (isolating) actuators run the valve fully open or closed a few times per hour. Modulating actuators position the valve continuously in response to a control signal and are built for many starts per hour. Specify the duty correctly — a modulating application needs a modulating-rated actuator.
Integral controls
Actuator controls such as AUMA AC and AM handle motor switching, limit and torque monitoring and the interface to the control system (hardwired, 4–20 mA, PROFIBUS, Modbus and others). Integral controls simplify wiring compared with separate MCC-based control.
What to specify
- Valve type, size, pressure class and maximum torque/thrust required.
- Required operating time and duty (open-close or modulating).
- Power supply, enclosure protection and, for hazardous areas, explosion-proof certification.
- Control interface and feedback signals.
Frequently asked questions
Can an existing manual valve be automated?
Usually yes, with the right mounting adaptation and actuator sizing. We need valve make, size, type and torque data.
Electric or pneumatic?
See our comparison of electric and pneumatic actuators; the choice depends on available utilities, speed, fail-safe needs and the site.
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