Flow control valve with piero-electric actuator.

摘要

A flow control valve comprises a valve chamber having an inlet and an outlet for a fluid to be controlled, a valve seat provided in the valve chamber on a side of the outlet, a valve body provided in the valve chamber and adapted to abut against the valve seat, and driving means including a piezo-electric unit of laminated piezo-electric elements or bimorph type piezo-electric elements deformable in response to voltage applied to the unit so as to drive the valve body toward and away from the valve seat to close and open the valve. According to the invention, the valve body is driven by the driving unit of the piezo-electric elements having high frequency responsibility so as to precisely control the fluid flow in short interval of time. The driving force of the driving means is very strong of the order of several Kg to ensure the positive operation of the control valve so as to increase its reliability. Furthermore, the strong driving force need not provide damping means for a vibration system of the valve and therefore makes simple in construction the control valve itself.