Measuring Hydraulic GPM at the Function That Is Actually Slow
HGW Hydraulics on Dec 31st 2025
A pump catalog may list a flow rate, but that number does not prove how many gallons per minute reach a cylinder on a warm machine under load. Real circuit flow changes with pump speed, displacement control, internal leakage, valve position, fluid condition, and the pressure losses between the measurement point and the actuator.
The useful question is not simply “What is the system GPM?” It is “Wh