Calculating Fluid Flow for Hydraulic Motors

Flow rate would be displacement times rpm.

Hi

If you look on the motors they should have a name plate of the motor and the model should also be refected.IE Vickers or Rexroth...knowing that information should get you the curve from the manufacturer..if not then you can do it the long way...

best

To help, anyone would need:

Operational PSI while 55 hp is being delivered @2000 RPM, motor type and, the full range of load charactoristics.

55hp @ 2000 rpm will most likley require a speed increaser (gear box). The most durable vane motors operate at lower speeds. Higher speed motors don't last long and tend to be more sensitive about the power, load and, oil condition. I would go with Rineer motors and speed increasers before I would consider higher speed stuff. If you are turning something that is in effect a flywheel the you will be to protect the motor with a pilot operated double crossover relief or the motor will become a cavitataing pump on any deceleration. The crossover will loop the oil at low prressure differentials just in front of the motor as soon as pressure goes negative on the main pressure hose. Keep the oill lines aas big as you practically can.

h2om@hotmail.com

Rough rule of thumb as far as driving a hydraulic motor is:

For every 1 HP of drive, the equivalent of 1 GPM @ 1500 PSI can be produced, ignoring all component and system efficiencies of course.

Hence, as Ozzb stated, RPM is strictly a function of motor displacement dependent on flow, and system pressure for torque at that RPM.

Gotta know the displacement.