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Magnetic control valve

  • US 3,982,722 A
  • Filed: 11/21/1975
  • Issued: 09/28/1976
  • Est. Priority Date: 11/21/1975
  • Status: Expired due to Term
First Claim
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1. A valve for controlling fluid flow comprising:

  • means forming an inlet and an outlet to direct fluid through the valve;

    a radially flexible member having end portions attached to said inlet and outlet means, respectively, in a fluid-tight manner to cause fluid to flow through an intermediate portion of the tubular member;

    means having a substantially annular configuration encircling said intermediate portion of said flexible member and attached to said inlet and outlet means to limit outward expansion of said flexible member, thus forming a variable volume annular space therebetween;

    a plurality of relatively small particles partially filling said annular space capable of movement to end portions thereof to permit maximum outward expansion of said intermediate portion when the valve is in an open operative condition and alternately of movement to a central portion of said annular space encircling said intermediate portion of said flexible member when the valve is in a closed operative condition;

    means which may be selectively energized to cause movement of said particles, thereby producing an accumulation of particles encircling said intermediate portion and against the encircling housing means, thereby causing radial contraction of said flexible intermediate portion to decrease the flow area of the valve.

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