Laser position indicator for valve stem
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United States of America Patent
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Jul 27, 1993
Issued Date -
N/A
app pub date -
Jul 31, 1992
filing date -
Dec 27, 1990
priority date (Note) -
Expired
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Abstract
The displacement of a valve stem (16) is measured during diagnostic testing by temporarily mounting a laser head (112) on the valve body (18) or yoke (20), for generating a source laser beam (118) that reflects from a target (120) that moves with the stem. The timing of the reflected beam (132) returning to the head (112) relative to the projection of the source beam, gives an indication of the displacement of the stem.
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