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What is an actuator?

What is an actuator? Here are some definitions.

Noun
  1. Something that actuates something else, especially a usually electric device that causes a mechanical device (i.e. a mechanism) to be switched on or off, for example an electric motor that opens and closes a valve
  2. (computing) The mechanism that moves the head assembly on a disk drive
  3. (electrical) A relay that controls the flow of electricity
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A unique feature is the ability to directly attach a muting actuator for building up a muting system.
An attachable implement such as a loader bucket is attached to the actuator.
The actuator valve assembly and suction tube is screwed onto the cylinder and the tank is pressurized with a standard tire inflation system.
The Army conducted extensive testing of the trailer, with a modified brake actuator mechanism and strengthened trailer chassis and tow bar.
If that actuator starts to move unexpectedly, it acts as a generator and the short provides an electrical load that slows the motor down.
A gentle squeeze is all that's required to power an actuator which opens the lid without any physical effort.

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