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Proportional electropneumatic solenoid-controlled valve

  • US 4,954,799 A
  • Filed: 06/02/1989
  • Issued: 09/04/1990
  • Est. Priority Date: 06/02/1989
  • Status: Expired due to Term
First Claim
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1. A rectilinear motion proportional solenoid device comprising:

  • a housing containing an electromagnetic coil, said electromagnetic coil having a longitudinal axis and a bore coaxial therewith, for producing a magnetic field, said housing containing magnetic material for providing a flux path for said magnetic field;

    a magnetic pole piece disposed within the bore of said electromagnetic coil;

    a movable armature assembly of magnetic material;

    suspension spring means within said bore of said electromagnetic coil for supporting said movable armature within said bore adjacent to one end of said magnetic pole piece for axial movement within said electromagnetic coil, so that an axial gap is formed between a first portion of said armature assembly and said magnetic pole piece and a radial gap is formed between a second portion of said armature assembly and a first portion of said housing; and

    means for causing the force imparted to said movable armature by the application of a current to said electromagnetic coil to be substantially constant irrespective of the magnitude of said axial gap for a variation in said axial gap over a prescribed range.

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