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Hydraulic Pump Motor Sizing

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Equations for hydraulic pumps:

Flow rate

Q = D n / 1000                                     (1)


Q = flow rate (l/min)

D = displacement of piston (cm 3 /rev)

n = revolutions (rpm)

  • rev = revolution
  • rpm = revolution per minute

Shaft Torque

T = D p / 20 π                               (2)


T = torque (Nm)

p = pressure (bar)

Shaft Power

P s = T n / 9554                            (3)


P s = shaft power (kW)

Hydraulic Power

P h = Q p / 600                           (4)


P h = hydraulic power (kW)

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