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Pressure operated pulsatile fluid flow device

  • US 4,489,750 A
  • Filed: 08/25/1981
  • Issued: 12/25/1984
  • Est. Priority Date: 08/25/1981
  • Status: Expired due to Term
First Claim
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1. A fluid flow control device comprising:

  • a housing having an inlet, an outlet and defining a fluid flow path from the inlet to the outlet;

    a flexible, resilient valve means located within the housing along the flow path for normally obstructing the flow path to preclude flow through the outlet, said valve means comprising a hollow, cylindrical resilient and flexible member having a closed end and open end, said member having greater resistance to axial collapse than to radial collapse;

    said valve means further comprising a cylindrical holder adapted to receive the valve member, at least a portion of the open end of the valve member being disposed within the cylindrical holder with the closed end protruding out of the holder, thereby exposing a portion of the peripheral cylindrical surface of the valve member, at least part of that portion of the cylindrical member which is disposed within the holder effecting a seal between the inner cylindrical surface of the holder and the outer cylindrical surface of the open end of the valve member;

    said valve means being constructed and arranged to shift to an open position in response to a triggering pressure differential of a first magnitude across the valve means, and to return to its obstructing position in response to a drop in said pressure differential to a second magnitude which is less than that of said first magnitude;

    said valve means being constructed and arranged to define a toggle action when shifting from its obstructing to its open configuration, said toggle action being effective to substantially instantaneously shift said valve means from said obstructing to said open position;

    the length of the valve member being approximately double the length of the holder.

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