3.2.1 Describes the basic hydraulic system

3.2.1 Describes the basic hydraulic system

•      The principles of operation of a hydraulic actuator are like those of the pneumatic actuator

•      when a large amount of force is required to operate a valve (for example, the main steam system valves)

•      Piston types are the most common.

(source: http://www.engineersedge.com/hydraulic/hydraulic_actuator_2.htm )

3.2 Explain the concept hydraulic devices

Two common types:

1. Single action cylinder (SAC)
2. Double action cylinder (DAC)

 

Double Acting Cylinder

Figure: Operation of DAC

•      The PISTON is inside the cylinder, the diameter of which is known as the BORE.

•      piston seal to keep the pressure from bypassing to the other side

•      build the required pressure

•      ROD (or shaft) of the cylinder, usually with the rod passing through the piston and attached with a large nut on the opposite end

•      (same with pneumatics type)

(source: http://www.hydrauliconline.com/hydraulic-cylinders/how-do-hydraulic-cylinders-work/)

 

 Figure: Hydraulics Pistons?cylinders

 

 Figure: Industrial Robot using Hydraulic actuators

  

VIDEO: Hydraulic Arm Robot!!!

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