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Linear digital proportional piezoelectric valve

  • US 9,562,621 B2
  • Filed: 04/23/2014
  • Issued: 02/07/2017
  • Est. Priority Date: 05/07/2013
  • Status: Active Grant
First Claim
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1. An electrically controlled valve, comprising:

  • a shaft;

    a piezoelectric motor affixed to an end of the shaft and drives the shaft in a first linear direction and a second opposite linear direction;

    a controller which provides power to the piezoelectric motor to move the shaft with a first speed and a second speed, the first speed being faster that the second speed;

    a follower which receives the shaft, and slides relative to the shaft in response to the shaft moving with the first speed, and grips and moves with the shaft in response to the moving with the second speed;

    a valve member which moves with the follower; and

    a valve seat, the valve member is configured to be moved by the follower against the valve seat to restrict fluid flow and to be moved by the follower away from the valve seat to increase the fluid flow.

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