This study aimed to experimentally characterize a piezoelectric microp ump with valves that have no moving parts. These pumps are typically com pact, have low flow rates (ml/min), low power consumption, and are used in various fields, particularly in the biomedical area for controlled drug deliv ery. The objective of this work was to characterize the flow inside the device, and for this purpose, three configurations were selected: one with two-channel Tesla-type valves, another with four-channel Tesla-type valves, and one with conical-type valves. Each configuration was evaluated under pulsatile and con tinuous flow conditions. The characterization of the flow within pumps and valves through velocity field measurements has not yet been reported in the literature. Therefore, this work aimed to contribute to this topic.The results ob tained from the tested devices indicated the existence of an optimal operating frequency for the pump, which yields the highest flow rate. For the evaluated devices, this frequency was 10 Hz. The greatest difference between forward and reverse flow in continuous mode was found in the nozzle/diffuser config uration. Finally, the internal velocity fields of the valves were analyzed using Particle Image Velocimetry (PIV). It is expected that the detailed character ization of these pumps, together with the PIV measurements, will contribute to the development of such devices.