In this paper we propose a delivery method for a PZT jet pump driven by repeated impulsive force of the actuator. The pump is simple in construction being composed of only a piston-cylinder and a receiving hole, and it has no check valves. The multilayer PZT actuator pushes the piston impulsively and the fluid in the cylinder is ejected out through the nozzle forming a jet flow. The receiving hole that is placed facing the nozzle catches the jet flow and one way flow can be obtained. Experimental works indicated that the driving frequency as well as the dimensions such as the diameters of the nozzle and receiving hole was important to improve the pump performance. Moreover it was recognized that while air bubbles were apt to be generated in the cylinder during the suction stroke they were exhausted out of the cylinder at under a certain driving frequency.

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