Definition - What does Hydraulic Actuator mean?
A Hydraulic Actuator is a device that helps in automatically closing or opening a valve. The actuator automates the operation of the valve and limits human interaction with the valve package. These actuators are hydraulic because the working media in such type of actuators is hydraulic oil. If the working media is air in the actuator, it is referred as pneumatic actuator.
Petropedia explains Hydraulic Actuator
In the mechanical and chemical industry, different types of valves play an important role in controlling the flow and pressure in the system. Actuators are controlled from control rooms and can be of three types, i.e., hydraulic actuators, pneumatic actuators and electric actuators. Generally, valves which are used in remote locations where less human intervention is required are either hydraulically or pneumatically actuated.
In the hydraulic type actuators, the working media is hydraulic oil which helps in the application of pressure on the mechanical components of actuator. The components in turn put pressure on the other components to which an actuator is connected by giving a suitable operational command from a control room.
There are three types of hydraulic actuators available:
- Piston style hydraulic actuator
- Scotch Yoke hydraulic actuator
- Rack & Pinion hydraulic actuator