Check valve position indication system and method
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United States of America Patent
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Apr 2, 1996
Grant Date -
N/A
app pub date -
Dec 7, 1992
filing date -
Dec 7, 1992
priority date (Note) -
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Importance
Abstract
Electromagnetic field pulses are induced in an electrically conductive/magnetically permeable housing and valving element movable within the housing of a check valve by an energizing coil placed against the housing and forming a loop extending substantially over the full range of travel of the valving element. At least two sensing coils positioned within the loop of the energizing coil proximate the two ends of the range of travel of the valving element, and preferably an array including additional sensing coils spaced between the two end coils, detect transient responses to the induced pulses from which the position of the valving element is determined.
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