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Magnetic fluid actuated control valve, relief valve and pump

  • US 4,053,952 A
  • Filed: 04/08/1977
  • Issued: 10/18/1977
  • Est. Priority Date: 10/10/1975
  • Status: Expired due to Term
First Claim
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1. A magnetic fluid actuated relief valve for human implantation for controlling flow of liquid at pressures below a preselected value from an upstream position to a downstream position, comprisingmeans to define a passageway having an upstream end and a downstream end, said passageway having an occludable portion of variable cross-section;

  • andmeans to occlude said occludable portion of variable cross-section of said passageway, said means comprising a magnetic fluid in contact with the exterior of said occludable variable cross-section portion, and magnetizing means for providing a magnetic field of preselected magnitude for generating a preselected first pressure in said magnetic fluid sufficient to occlude said variable cross-section portion only when the upstream pressure in said passageway is below said preselected first value,whereby said relief valve opens against the force exerted by said first pressure of said magnetic fluid when the upstream pressure reaches a second pressure which exceeds said preselected first pressure.

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