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__Hydraulic Power or Fluid Power__

__Hydraulic Power or Fluid Power__

The hydraulic power is directly related to the volume flow Q and pressure p. Or in another words: The higher the pressure and the greater the flow rate, the more power you get:

**Hydraulic power P**_{hydr}** = Pressure p X Flow Rate Q **** **

This equation can be explained most simply using the example of a hydraulic cylinder, which converts hydraulic power into mechanical power:

**In practice, the following formulas are used to calculate the Hydraulic Power:**

In this equation you can specify the values for the pressure in bar and the values for the flow rate in liters / minute (as is common in practice) and you will get the desired result in kW.

** ****P**_{hydr}** in kW = Pressure (bar) X Flow Rate (L/min) **

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If you specify the values for the pressure in psi and the values for the flow rate in gpm, you will get the desired result in hp by using this equation:

** ****P**_{hydr}** in hp = Pressure (psi) X Flow Rate (gpm) **

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**Exercise:**

A pump delivers an effective working pressure of 60 bar and a volume flow of 2 liters per minute at its outlet. As actuator you have a cylinder with an efficiency of 0.96. Calculate the mechanical power of the cylinder as well as its extension speed!