DETERMINATION OF ACTUAL DISCHARGE OF HIGH-PRESSURE LOW-DISCHARGE AXIAL PISTON PUMPS.

High-pressure low-discharge axial piston pumps are commonly used for the dosage of fluids of various physical properties and can be found in numerous technical systems. The discharge characteristics of these pumps should be very precise and reliable. Experiments performed with a high-pressure low-discharge axial piston pump show that in the operating range of the discharge pressure and stroke length, the actual discharge of the pump deviates from the theoretical one by up to 35 %. The operation of non-return valves during the suction and discharge phases are analysed and the analytical expression that corrects this deviation is derived. The proposed expression predicts the measured discharge with a relative error of less than 3%. [ABSTRACT FROM AUTHOR]