Having an oil inlet port at either side of the piston seal allows a double acting hydraulic cylinder to be extended and retracted using hydraulic power. This type of cylinder is usually used where an external force is not available to return the cylinder to its starting position or where a force is required in both directions.


  • Force is delivered in both extension and retraction of the piston rod
  • Offers good control in both directions of travel
  • Easily adapted to integrate most types of valves
  • Hard wearing
  • Easily adapted to include most types of position detection


  • Retraction force is less than the extension force unless the pressure is increased
  • More costly than a single acting cylinder
  • Require more space than a telescopic cylinder