Abstract
This paper describes a new energy-saving high-speed control valve using a multilayer piezoelectric actuator and a spool valve. This valve controls the flow rate by controlling the amplitude of the spool vibration at 2kHz. Because piezo displacement is too small to drive the spool, this valve has springs and a spool as a mass. 2 kHz is the resonance frequency of this spring-mass system. Leaf springs and a linear ball bearing are used to reduce friction and prevent loose support. Experimental results show that a resonance frequency of 2kHz can be achieved by this structure and the flow rate can be controlled by the amplitude of the spool vibration. However, the flow-control characteristic is strongly influenced by unsteady flow forces.
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