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Check valve position indication system and method

  • US 5,504,426 A
  • Filed: 12/07/1992
  • Issued: 04/02/1996
  • Est. Priority Date: 12/07/1992
  • Status: Expired due to Term
First Claim
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1. A system for detecting from outside a valve housing, the position of a movable valving element within the housing, said system comprising:

  • energizing coil means placed adjacent said housing, wherein said energizing coil means spans a range of movement of said movable valving element;

    energizing means applying a current pulse of predetermined pulse amplitude and duration to said energizing coil means to induce an electromagnetic field pulse in said housing and said movable valving element;

    sensing means sensing amplitude and temporal characteristics of transient secondary electromagnetic fields generated by said electromagnetic field pulse in said housing and said movable valving element; and

    output means generating an indication of the position of said movable valving element within said housing from said sensed amplitude and temporal characteristics of said secondary electromagnetic fields.

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