What is an electric actuator?
An electric actuator converts electrical energy into mechanical motion to rotate or drive a valve stem. The main formats are:
- Quarter-turn (part-turn) – 0–90° rotation for ball, butterfly and plug valves. Ideal for on/off and modulating service. Typical ranges span tens to thousands of Nm.
- Multi-turn – Multiple revolutions to operate gate and globe valves; available in on/off and continuous modulating variants.
- Linear – Direct linear thrust for globe/control valves (via integrated or external gearboxes).
Modern platforms add non-intrusive setup, data logging, condition monitoring and fieldbus/industrial Ethernet communications for seamless integration.
Key features & options
- Control modes & duty – On/off, inching, modulating and continuous modulating duties; correct duty class selection ensures thermal performance and service life.
- Torque/thrust & speed – Sized to the valve’s required torque/thrust across the full stroke (including running, breakaway and seating).
- Protection & certification – Typical enclosures up to IP67/68, options for ATEX/IECEx hazardous areas depending on model. (Check each series datasheet.)
- Manual override & failsafe – Handwheels are standard; some platforms offer electronic braking and failsafe options depending on configuration.
- Interface & mounting – ISO valve mounting patterns and modular gearboxes enable part-turn or linear duties from a common platform.
- Diagnostics & connectivity – Non-intrusive commissioning tools, event logs and digital communications (fieldbus/Ethernet) aid maintenance and automation.
Applications
Electric actuators are selected where clean operation, precise positioning and easy control system integration are priorities, including:
- Water & wastewater treatment – Automated isolation and control on networks and plants.
- Power generation & utilities – Reliable valve automation with advanced diagnostics.
- Food & beverage & pharma – Hygienic processes benefit from sealed, low-maintenance actuation and washdown-ready designs where required.
- Chemical & process industries – Modulating and on/off service with hazardous-area options where necessary.
How to select the right electric actuator
- Define valve & duty – Valve type/size; required operation (quarter-turn, multi-turn or linear); control duty (on/off vs modulating).
- Calculate torque/thrust profile – Include breakaway, running and seating loads across the full stroke; apply safety margins for process conditions.
- Check environment – Temperature range, enclosure rating, corrosion protection, and hazardous-area certification if applicable.
- Confirm speed & resolution – Match stroke speed to process needs; ensure sufficient resolution/starts per hour for control stability.
- Integration & lifecycle – Consider non-intrusive setup, local controls, diagnostics, networking and service support. AxFlow provides sizing and commissioning assistance and carries spares/service capability through local teams.
Why buy electric actuators from AxFlow?
- Portfolio breadth – Rotork (IQ, CK families) and NOAH quarter-turn ranges available in selected countries.
- Local expertise & service – AxFlow entities offer specification support, site services and lifecycle care with manufacturer backing.
- Process knowledge – Deep application experience across water, power, chemical and hygienic industries. (See AxFlow market segment coverage.)
