What is a hydraulic actuator?

A hydraulic actuator is defined as a device that converts hydraulic energy into mechanical movement. This transformation occurs within sealed units, where pressurized hydraulic fluid is directed into a cylinder or another similar component, causing a piston or rod to move. This movement can then be utilized to perform work, such as lifting, pushing, or pulling heavy loads in various applications, including machinery, vehicles, and industrial equipment.

The other options identify capabilities or functions that do not align with the primary role of a hydraulic actuator. For instance, converting hydraulic energy to electrical energy refers to a completely different function typical of hydraulic generators rather than actuators. Storing hydraulic energy pertains to hydraulic accumulators, which serve to hold fluid under pressure for future usage, distinct from the primary actions of actuators. Lastly, filtering contaminants from hydraulic fluid involves components such as hydraulic filters, which are vital for maintaining fluid cleanliness but do not directly relate to the mechanical movement tasks performed by actuators. Therefore, recognizing the specific role of a hydraulic actuator is essential for understanding its application and operation within hydraulic systems.