Example Hydraulic Circuits

Learn about these typical circuits and control techniques

Newbie Training  Hydraulic Training  Design Guides  Calculators


Hydraulic Load Control Fundamentals

load control circuit

Examine a range of load control circuits to understand some of the problems and pitfalls of moving loads with hydraulics. We consider each circuit and discuss the pressure balances that make them work. We show you how to experiment with our valve simulations to explore the circuits and better understand how they work.

Please note that the fluid stiffness values have been reduced in our simulation to better demonstrate the potential problems when using different load control circuits. This can be seen in delays when lifting the cylinder and oscillations when it's stopped suddenly. The issues do appear in actual systems but are only a problem apart for highly dynamic or high accuracy control systems. Examples include:

  • Cylinder creep due to spool leakage
  • Uncontrolled cylinder dropping
  • Meter out or meter out flow control
  • Pilot operated check valve load holding
  • Instability caused by long pipe lengths
  • Back pressure issues
  • Externally vented PO check valves
  • Counterbalance valve
  • Proportional valve with unvented counterbalance
  • Vented counterbalance with proportional valve

Load Control Circuits Training


Logic Circuits Designs

logic circuit

Learn about a range of logic control circuits to understand how they work and where they may be used. We show you how to experiment with our valve simulations to explore the circuits and better understand how they work. Approaches include:

  • Directional valve equivalent
  • Isolating slice
  • Freewheel crossover valve
  • Re-generation slice
  • Relief/red. gives proportional control
  • Relief valves give +/- accn control
  • Free design mode

Logic Control Valve Circuits Training


Applies to the following areas

This module applies to both mobile and industrial applications although much of the more comprehensive control features will only be used on industrial applications. Lower cost power units in the industrial sector are very similar to the simpler mobile power units.


Target Audience

People who are responsible for hydraulic equipment in the following ways:

Managing or purchasing hydraulic equipment.

Maintenance Engineers repairing hydraulic equipment.

Hydraulic equipment designs.


Previous knowledge required

Students are expected to be familiar with:

1. The operation of hydraulic fluid power equipment.

2. Understand hydraulic components and where they are used.

3. Able to read hydraulic circuit and their symbols.