Marine ActuatorThe main types of actuator for vessels include mechanical, pneumatic, hydraulic, electrical and hybrid, each being generally associated with different functions:
- Mechanical actuators are normally used for converting rotary motion to linear motion, as in pulleys and chains.
- Pneumatic ones are more associated with the main engine controls.
- Hydraulic is generally for dealing with heavy loads. Oil pressure is applied to give output. For example, in a ship’s steering gear, the rudder is moved in this fashion
- Electricals are the cleanest actuators and actuate using magnetic fields and not oil.
- Hybrids are a mix of some of the above. A common example is the thermo-hydraulic electronic actuators utilised in operating valves.