Electric Actuator

Electric actuators are key for managing fluid flows in various systems. They allow for remote valve operation, and come mainly in two types: on-off and modulating. Knowing the differences between these two types is vital for picking the best actuator for your needs. This guide will help you understand what sets them apart, what they’re good for, and where they best fit.


Functionality: On-off actuators work in a simple way: they either fully open or fully close a valve. Built-in limit switches help them detect when the valve is in the open or closed position for precise operation.

Control Mechanism: These actuators get a basic electrical signal. When told to open or close the valve, they keep going until they reach the instructed position. There’s no in-between; it’s either all open or all shut.


  1. Ease of Use: On-off actuators are simple to use, making them a good fit for basic valve control tasks.
  2. High Reliability: Their straightforward operation means less room for errors, adding to their reliability.
  3. Cost-Effective: Generally speaking, they’re cheaper than modulating actuators due to their simpler makeup.


On-off actuators are great when you don’t need to adjust the valve to different positions. They’re used in isolation valves, safety shut-off valves, and scenarios requiring either full flow or total closure.

Modulating Electric Actuators: A Closer Look

Functionality: Unlike on-off actuators, modulating types can position a valve at any point between fully open and fully closed. This enables more precise control.

Control Mechanism: Modulating actuators get variable electrical inputs, letting them place the valve at multiple levels of openness. This allows for fine-tuning of flow rates.


  1. Pinpoint Control: These actuators offer nuanced control over valve positioning, making them ideal for specialized tasks.
  2. Flexibility: The capacity to place the valve at any point gives more control over process parameters.
  3. Process Optimization: When you need steady conditions for quality, efficiency, or safety, modulating actuators are the go-to choice.


Modulating actuators are ideal for tasks that require detailed valve positioning, like regulating flow rates in industrial settings, keeping specific pressure levels in pipelines, or jobs requiring gradual fluid flow changes.


When it comes to fluid control, the type of actuator you choose plays a big role. On-off actuators offer binary, reliable control. Modulating actuators, on the other hand, give you more control and flexibility. Knowing the differences helps you choose the right actuator for your specific needs, leading to better performance, efficiency, and safety. By grasping these distinctions, you’ll be better equipped to make an informed choice that will serve your fluid control systems well.