The Fluid Power Blog

Cylinders conduits flow rate and velocity

Cylinders conduits flow

Cylinder’s flow

These calculations can help you to figure-out conduits’ (hoses, pipes or tubes) ID sizes, piston speed, flow velocity and cylinder’s force.

Calculations Notes:

  • The recommended flow velocity in conduits you can find at the article Recommended flow velocity.
  • The assumption: if you use more than 1 cylinder in calculations, all cylinders have the same parameters (bore/rod diameters, stroke and friction)
  • The assumption: Pressure and Return lines conduits (flow source – flow divider and flow divider – tank) have the same ID size.
  • The assumption: the conduits between flow divider and cylinders have the same ID size.

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Recommended flow velocity

These values I use for my calculations when I need to compare flow velocity with recommended min and max values. I took these data from different sources: recommendations in technical manuals of Parker, Gates, Eaton and other hose and tubes suppliers.

These are average values from my collection of all supplier recommendations.


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For my work I use AutoCAD LT or ePlan Fluid to draw hydraulic, pneumatic, lube and P&ID schematics. Companies where I worked and where I have the work now, provide with these software, because the price of them is unbelievably high for regular individual.

One day, after reading of this article I decided try to find something absolutely FREE for Fluid Power schematic design.

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