Hydraulic flow & pressure

Define the circuit you mean

On the planning sheet, label each number with its circuit and measurement condition. Ask whether a quoted flow is available at the implement connection and what happens when other functions operate. An unlabelled pump figure is not enough to populate a defensible estimate.

Record the implement’s required flow, pressure, valve arrangement, couplers and return instructions separately. Power is useful context, but equal calculated power does not establish hydraulic compatibility.

Calculate power at the operating point

Parker’s motor formula uses flow, pressure difference and total efficiency. With flow in litres per minute and pressure difference in bar, theoretical power is their product divided by 600. Multiplying by an efficiency fraction estimates mechanical output at that assumed operating point.

For example, 60 L/min at 200 bar is 20 kW theoretically; at an assumed 80% total efficiency, output is 16 kW. These values illustrate arithmetic, not a tractor or motor recommendation.

Use the result for a better question

If two proposed arrangements produce the same power, compare the underlying flow and pressure values. Ask the supplier which operating point the selected motor and circuit allow. Keep the answer with the machine documents.

Our calculator does not model heat, pressure losses along individual hoses, duty cycle or simultaneous functions. Those need more information than this tool collects. Its purpose is to make a stated assumption understandable and reviewable, not to replace circuit design.