What is an actuator and how it works

 An actuator


An actuator is a device that converts energy to linear motion or rotary motion that is operated electrically, manually and by air or fluids. There are two types of actuator are commonly used to hydraulic system. One of them is Linear and other one is rotary. Linear actuator creates straight motion and rotary actuator creates rotary or circular motions they are operated by hydraulic fluids by compressed air.Some pneumatic actuators are below:
• Pneumatic cylinder
• Pneumatic diaphragm pump 
• Air operated oil pump 
• Pneumatic rotary actuator

Pneumatic cylinder

Pneumatic cylinder is a linear actuator and it can move forward and backward. Pneumatic cylinder consist of some parts is listed below
  • Rod end Port
  • Cap end port
  • Barrel
  • Piston
  • Piston rod
  • Tie rod

Diaphragm pump

Diaphragm pump is a positive displacement pump and also a linear actuator that use a reciprocating movement of Diaphragm and displace fluid by opening and closing of suction and discharge valves. Read more

Diaphragm pump

Air operated oil pump

Air operated oil pump is a kind of linear actuator that forcing a piston toward forth and back to moves fluid in a system.


Some hydraulic actuators are below

  • Hydraulic cylinder
  • Hydraulic motor

Hydraulic cylinder

Hydraulic actuator 

Hydraulic cylinder is the same as pneumatic cylinder that can also move forward and backward and known as linear actuator. The main difference is between pneumatic cylinder and hydraulic cylinder is the power source. Pneumatic cylinder is operated by compressed air and hydraulic cylinder is operated by pressurized fluid. And hydraulic cylinder is more powerful than pneumatic cylinder.

Hydraulic motor

Usually, Hydraulic motor is a rotary actuator that is used to handle heavy applications and it can acting directly to the rotary load and maintain a good acceleration,de acceleration instant reversal and stooping. In the above video is showing a hydraulic motor.


1. Automobiles and forklifts lifting aids 
2. Aircraft wings control 
3. Excavators and cranes wheel operating 
4. Clamping tools and parts
5. Punching operations 
6. Molding operations 
7. Machine tools positioning 
8. Locking work-piece to the specific position. 
9. Fluid and air pumping 

Airandhydraulic videos Basic hydraulic system components. Basic pneumatic system. Basic hydraulic components pneumatic system  

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