Actuator
An actuator is a type of motor that either pushes, pulls, or rotates.
Linear Actuators
Linear actuators are actuators that move in a straight line. They can be made to move by electricity, or by pushing water or air very hard. When water (or oil or another liquid) is used, it is called hydraulic, and when air is used, it is called pneumatic. Hydraulic systems are used for moving very heavy things, like in cranes, excavators, or bulldozers.
Actuator Media
electrothermal actuators, thermal actuators, *The thermo-electric actuator is installed on the underfloor heating manifolds and controlled remotely by room thermostats to open or close valve for individual circuits/loops. For a normally closed (NC) thermo-electric actuator, the valve being controlled stays closed when the actuator is powered off.