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Piezo valve

  • US 5,343,894 A
  • Filed: 09/29/1992
  • Issued: 09/06/1994
  • Est. Priority Date: 09/30/1991
  • Status: Expired due to Fees
First Claim
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1. A piezo valve which comprises:

  • a housing that defines a chamber, a medium output channel which communicates with said chamber, a medium input channel which communicates with said chamber, and a medium discharge channel which communicates with said chamber, said medium discharge channel being located generally opposite said medium input channel and having a larger cross section than the cross section of the medium input channel,a piezo bending element located within said chamber and defining a sealing end which can alternatively block said medium discharge channel and said medium input channel,an electrical lead connected to said piezo bending element for supplying one of a first and a second control voltage to said piezo bending element, andmeans for mounting said piezo bending element in said chamber so as to be biased into a first switch position wherein said sealing end thereof blocks said medium input channel but allows bending of said piezo bending element into a second switch position wherein said sealing end blocks said medium discharge channel, said piezo bending element bending into said second switch position when said first control voltage is supplied thereto and is retained in said second switch position by fluid passing into said chamber through said medium input channel, and said piezo bending element bending into said first switch position when said second control voltage is supplied thereto and is retained in said second switch position without an electrical voltage supplied thereto.

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