Fluid handling – Processes
Patent
1991-06-20
1993-03-16
Chambers, A. Michael
Fluid handling
Processes
137554, 3242072, 340686, F16K 3700
Patent
active
051935686
ABSTRACT:
One or more electrical coils are carefully located on the outside of a valve body. An alternating current passing through the coil(s) results in an alternating electromagnetic field being transmitted into the valve body and valve internals. The electromagnetic field varies in intensity and polarity in the valve. As the position of a valve internal part is changed, the electromagnetic field throughout the valve body and its internals is altered. A passive receiver coil carefully located on the outside of the valve body detects the intensity of the electromagnetic field at that location as an induced electrical voltage in the coil. With the change in position of the valve internal part, there is a corresponding change in the induced voltage as a result of the alteration in the alternating electromagnetic field at that location. Changes in the voltage provide an indication of the position and motion of valve internals.
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The Theory of Electromagnetic Flow-Measurement by J. A. Shercliff (1962).
(Liberty Attachment 1) Notebook entries from Liberty Technologies, pp. 97-99, 107-109.
(Liberty Attachment 2) Patent application without claims, "System for Determining Position of an Internal, Movable Conductive Element,".
(Liberty Attachment 3) U.S. patent application with claims, "A Non-Invasive System and Method for Inspection of Valves," Liberty File: MCEL-1.
Casada Donald A.
Eissenberg David M.
Haynes Howard D.
Adams Harold W.
Chambers A. Michael
Martin Marietta Energy Systems Inc.
Spicer James M.
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