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Actuator for a fluid valve

  • US 7,164,336 B2
  • Filed: 05/23/2003
  • Issued: 01/16/2007
  • Est. Priority Date: 11/14/2000
  • Status: Expired due to Term
First Claim
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1. An actuator for actuating a valve in a fluid system, the actuator comprising a closed housing shell made of a magnetically conductive material, circumscribing a central axis and containing a non-magnetic fluid medium, a coil support having an actuation projection and being axially displaceable within the fluid in the housing shell and forming a first air gap with respect to the shell, with at least one current-carrying coil wound onto the circumference of the coil support and extending along a predetermined axial extent of the support, and with a cylindrical magnet tube enclosed by the coil support and forming a second air gap with respect to the support, with a sequence of a permanent magnet and a pole disk made of a magnetically conductive material arranged axially in the tube'"'"'s interior, wherein the axial extent of the coil is greater than the axial extension of the pole disk associated with the coil, and the dimensions of the permanent magnet and the pole disk correspond to one another such that i) the end face cross-sectional area of the permanent magnet corresponds to at least the circumferential surface of the pole disk;

  • and ii) the axial extent of the coil associated with the pole disk overlaps the axial extension of the pole disk by the stroke amplitude of the coil support, wherein the width of the second air gap between the coil support and the cylindrical magnet tube is sufficient such that a laminar lubricating film is established between the cylindrical magnet tube and coil support without displacing fluid surrounding the coil support when the coil support is displaced.

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