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Apparatus for driving piezoelectric element for closing and opening valve member

  • US 5,057,734 A
  • Filed: 11/29/1989
  • Issued: 10/15/1991
  • Est. Priority Date: 11/30/1988
  • Status: Expired due to Term
First Claim
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1. An apparatus for driving a piezoelectric element to transmit a displacement of said piezoelectric element via a liquid to a valve member, for closing and opening said valve member, comprising:

  • a high DC voltage generating means;

    a charging switching means, connected to said high DC voltage generating means and said piezoelectric element, for generating a first voltage and applying said first voltage to said piezoelectric element for a predetermined time so that said valve member reaches a position near to a valve seat, and thereafter, increasing a voltage applied to said piezoelectric element from said first voltage to a second voltage higher than said first voltage so that said valve member is seated on said valve seat, to thereby close said valve; and

    a discharging switching means, connected to said piezoelectric element, for discharging charges stored in said piezoelectric element to open said valve.

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