Pneumatic actuator

A Pneumatic actuator is generally operated in applications where is it required to have a high number of operations with low load requirement. Traditionally this has been the only way, along with hydraulics to have a linear motion. On some applications is may be required for the Pneumatic actuator to hold a position for a prolonged period of time, for this air pressure needs to be applied constantly. To provide constant air pressure requires a pump to be constantly running, this costs money.

Electric Linear actuators are generally self sustaining and as such can maintain a position with the power switched off. It has been suggested that if every Pneumatic actuator was replaced with a linear actuator it would be possible to switch off a power station. Linear actuators also have the advantage of being able to hold a load when the power is switched off, where as Pneumatic actuator, again needing a constant air pressure. Electric linear actuators are fitted with limit switches at the end of stroke, the function of the switch is to switch off the DC power at the end of stroke thus preventing damage to the unit. The Pneumatic actuator relies on the unit hitting and sitting against the end of stroke.