Tag Archive: valve

Hydraulic Load Sensing design FAQ

By subscriptions I have received the separate links to “Load-Sensing Systems FAQ” from different suppliers. To read them you need to click the links below, fill the forms and download the PDF files with FAQ:

Of course, it’s free. Next questions are discussed there:

  • How can load sensing be beneficial to a hydraulic system?
  • What is the typical efficiency of a hydraulic system?
  • What are the problems when flow is fixed?
  • How is load sensing technology energy effective?
  • etc.

Pilot Operated Check Valves or Counterbalance Valves?


  • When use Pilot Operated Check valves?
  • When use Counterbalance valves?
  • Design advises for topic valves.

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First of all, Pilot Operated check valves are NOT a cheap solution of Counterbalance valves.

Yes, both of them have next the same benefits:

  • Prevent a load from dropping in case of hose or tube failure.
  • Prevent a load from drifting caused by directional control valve spool leakage.
  • Leak-free load holding.

But each of them has the specific applications.

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Pilot ratio & pilot pressure of counterbalance valves


  • Understanding the pilot ratio of the counterbalance valves
  • Calculations the pilot pressure of the counterbalance valves for different applications

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Lower pilot ratios will increase system stability and provide better motion control. Therefore, the vast majority of counterbalance applications are satisfied with a 3:1 pilot ratio.

Higher ratios will be more efficient (reduce heat generation) but at the cost of stability and smooth motion control. This is why 10:1 pilot ratio valves, generally, should be avoided. But, sometimes, on motors high pilot ratios will provide adequate dynamic control.

Two areas work to open a counterbalance valve, the relief area (port 3) and the pilot area (port 1); the pilot area divided by the relief area equals the pilot ratio:

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