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Pilot stage or pressure control pilot valve having a single armature/flapper

  • US 6,460,558 B2
  • Filed: 12/04/2000
  • Issued: 10/08/2002
  • Est. Priority Date: 12/04/2000
  • Status: Expired due to Fees
First Claim
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1. A pilot stage, comprising:

  • first and second nozzles that are connectable to a fluid supply;

    a flapper having a free floating pivot and first and second ends, the ends being in fluid communication with the nozzles; and

    a magnetic torque motor without a permanent magnet having a first coil that is connectable to an electrical energy source, the first coil being magnetically coupled to the first end of the flapper, wherein the flapper will pivot in response to an input current to the first coil causing one end of the flapper to move closer to one of the nozzles, the free floating pivot comprising a pivot pin extending through a hole in the flapper with a small clearance existing between the hole and the pin.

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