NASA NTRS · 19780000412
Noncontacting valve-position indicator
Abstract
Position of sealed valve or other movable part is indicated without penetrating housing. Flux from magnets connected to stem of hydraulic valve penetrates pressure wall and is sensed by Hall-effect transducer outside wall. When valve closes, moving stem and magnets, voltage from transducer decreases; thus, stem position is indicated without physical contact.
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Crovella, E. A., Cummins, R. D., Wada, J. M.. 1979-01-01. Noncontacting valve-position indicator. https://ntrs.nasa.gov/citations/19780000412
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