Stem load determining system

A stem load determining system comprises a method and apparatus for determining the load developed on a threaded stem, including a valve stem driven by a valve operator. An integral component of the apparatus is a stem strain transducer uniquely designed to girp a threaded stem to define a guage length on the threaded stem and to detect and measure deformation of the stem at the guage length when subjected to a compressive or tensile load.

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Claims

Referenced Cited
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Other references
  • Sate Brochere. Measurements Technology Inc., "Strain Transducers and Instrumentation Systems"--Booklet. Measurements Group Inc., "Modern Strain Gage Transducers . . . Their Design and Construction," Raleigh, NC--Booklet (See especially, Part III). Enginering Data Sheet--Micro Measurements Division--Measurements Group Inc., "General Information: EA-Series Strain Gages". Measurements Group Inc., Catalog 400, "Strain Gage Listings 84". SATEC Extensometers--Bulletin Ex--5016 SATEC Systems, Inc., Grove City, Pa. M-Line Accessories Instruction Bulletin B--127--9, "Strain Gage Installations with M-Bond 200 Adhesive", Measurement Group Inc., 1979. The Center of Professional Advancement, "Strain Gage Measurements" Booklet.
Patent History
Patent number: RE35918
Type: Grant
Filed: Mar 27, 1991
Date of Patent: Oct 13, 1998
Assignee: Westinghouse Electric Corporation (Pittsburgh, PA)
Inventors: Paul Gene Anderson (Acworth, GA), John A. McMennamy (Marietta, GA)
Primary Examiner: Robert Raevis
Attorney: Isaf, Vaughan & Kerr
Application Number: 7/675,958
Classifications
Current U.S. Class: 73/86249; Magnetic (33/708)
International Classification: G01B 500;