This paper presents the results of experimental research of the phenomena occurring in water ram during a single cycle of its operation. Apart from a brief introduction and description of the test stand and data recording system, the work includes a broad interpretation of the obtained results. Based on the pressure waveforms recorded in two characteristic zones of the device and its detailed analysis, the single cycle of waterram is divided into three main stages: acceleration, pumping, and backflow. The waveforms of phenomena in each of these steps were considered separately. In discussion, some of the issues were supported with additional measurements, including Fourier analysis of signals from the electronic pressure transducers. The main topic ofdiscussion based on the results recorded for the impulse valve, is supplemented by the comments that take into account the results obtained for the impulse valve (flap check valve) and for the others two (self-made) impulse valves. In the final part, in a graphic form presented is the interpretation of the phenomena occurring during one work cycle of water ram. The motivation of this work was to supplement the knowledge concerning the water hammer waveform in ram pump.
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