Actuators

Lyma product range

Pneumatic actuators

An actuator or actuator is simply a 'motor' used to operate the valve. Actuators are intended for on/off or control. The design of the actuators is mainly divided into two types, 90° actuators or multi-turn actuators.

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Prism pneumatic actuators type PP

Prism pneumatic actuators type PA

Magnetic valve Namur

Terminal box

Speed control

Valve positioner (positions)

Pneumatic actuators are available in two versions: double-acting or single-acting. With a double-acting actuator, you need to push air into the actuator to both close and open. With a single-acting actuator, air is only needed in one direction, the other direction is controlled by springs. Pneumatic actuators are also available as multi-turn actuators and are mainly used for control valves.

A solenoid valve is often used to control the air supply during on/off operation. The position of the actuator is indicated by means of inductive or mechanical limit switches.

In control, a valve positioner is used to communicate with the actuator. There are several different options for control, usually 4-20 mA or a communication protocol called fieldbus. These are available in different standards, such as Profibus, MODbus or HART.