Answer :
Final answer:
Pneumatic actuators use air pressure, electric actuators rely on electric motors, and hydraulic actuators involve incompressible fluids for directional valve actuation.
Explanation:
Pneumatic: Pneumatic actuators use air pressure and pilot ports for directional valve actuation. An example is a pneumatic solenoid valve that uses compressed air for control.
Electric: Electric actuators utilize electric motors to move valves. They are often used for remote operations and can have failsafe mechanisms.
Hydraulic: Hydraulic actuators involve incompressible fluids and sealed sliding pistons to control valve movements. They are known for their instantaneous response.
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