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Servo valve for ultra-fast pressure regulation with controlled system damping

  • US 4,506,861 A
  • Filed: 01/10/1983
  • Issued: 03/26/1985
  • Est. Priority Date: 01/10/1983
  • Status: Expired due to Fees
First Claim
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1. A pressure differential controlling servo valve wherein the pressure differential across the valve is a simple and smooth function of electric current, said valve comprising a housing having a centrally positioned inlet and an outlet, a ferrite electromagnet positioned within the housing in flow communication with the inlet, said ferrite electromagnet comprising a torroidal ferrite body with a core of coiled wire within said torroidal body, said wire core being potted in said torroidal body by a gasoline resistant substance, the central opening formed by the torroidal body surrounding the housing inlet, the ferrite electromagnet having a top and a bottom, the top of the electromagnet having a smooth planar surface perpendicular to the housing inlet,a ferrite disk having a top and a bottom surface and sized to be coextensive with the electromagnet body, a magnetically impermeable film secured to the bottom surface of said ferrite disk and generally coextensive therewith, said film having a tongue extending outwardly beyond the edge of the ferrite disk, said disk being positioned on the top planar surface of the electromagnet with the film in confronting relation thereto, clamping means for securing the film tongue to the housing to hingedly retain the disk in position for back and forth movement with respect to the top planar surface of the electromagnet.said housing having an outlet chamber in flow communication with the outlet and adapted to receive flow from the inlet when the ferrite disk is raised away from the top planar surface of the electromagnet, and whereby the fluid in the inlet passes between the film and the top planar surface of the electromagnet to provide a hydrostatic full film bearing so that the hydrostatic full film pressure forces balance the magnetic forces and thereby insures nonimpaired and smooth response to current flow into the electromagnet.

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