Patent ID: 8353312

Claim:
A motorized valve, comprising a hollow case having at least one input tube and at least one output tube; a saddle connected with said hollow case; a turn plug having a rod, wherein said turn plug cooperates with said saddle; a piezoelectric motor, said piezoelectric motor including a piezoelectric generator of radially directed standing acoustic waves, which is fixedly connected with said hollow case and is connectable with a pulse current source, and a rotor operatively connected with said piezoelectric generator and kinematically connected with said rod of said turn plug so as to turn said turn plug when said rotor is actuated by said piezoelectric generator, wherein the length of said kinematic connection between said rotor and said rod is reduced, resulting in said motorized valve having a smaller size and mass and a reduced activation time, and an increased accuracy in angular positioning of said turn plug relative to said saddle; a control system including a generator of a cycle frequency, a pulse amplifier-interrupter connectable to the pulse current source, to a control output of said generator of the cycle frequency, and to an electric input of said piezoelectric generator; and a former of modes of operation connected to additional control inputs of said pulse amplifier-interrupter and also connected through a feedback chain to an output of said at least one sensor so as to provide modes consisting of a “start-stop” mode for opening and closing of the valve, and a pseudo-continuous “step-by-step” mode for accurate regulation of a flow rate of a flowing medium which flows through the valve; wherein the generator provides mechanical oscillations of up to about 1 MHz in the form of radially standing acoustic waves during a transition period between the open and closed positions of said valve, the transition period lasting for not more than 0.5 seconds.