Hydraulic Cylinder Speed Calculator

Inputs

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Inside diameter of the cylinder barrel, equal to the piston diameter.
mm
Piston-rod diameter. The rod area is subtracted on retract, so retract usually moves faster.
mm
Usable cylinder travel for the timed stroke.
mm
Flow available at the cylinder branch before the optional flow-efficiency allowance.
L/min
Delivered flow allowance for leakage, valve metering, cushion restriction and small line losses. Use 100% for ideal delivered flow.
%
Target one-way stroke time used to back-solve required extend and retract flow.
s

Results

Default result
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Extend speed(v_ext)
161.3mm/s

Delivered flow divided by full piston area.

Full piston area with delivered flow.

Also computed

Retract speed(v_ret)200mm/s

Delivered flow divided by annulus area.

Annulus area after subtracting the rod.

Extend stroke time(t_ext)1.86s

Stroke length divided by extend speed.

Retract stroke time(t_ret)1.5s

Extend + retract time(t_cycle)3.36s

Theoretical cycle rate(N)17.86cycles/min

Extend oil volume(V_ext)0.589L

Method notes 3 notes
  • Speed uses delivered flow divided by working area. Extend uses full piston area; retract uses annulus area after subtracting the rod.
  • Required target-flow outputs divide by the entered flow efficiency, so they estimate pump/valve flow needed upstream of leakage and metering losses.
  • This is a steady-flow screen. It does not model acceleration, deceleration, cushion restriction, meter-in/meter-out valve settings, load-induced overrunning or pressure drop through long hose runs.

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