Measuring and testing – Blower – pump – and hydraulic equipment
Patent
1992-09-16
1993-11-02
Cuchlinski, Jr., William A.
Measuring and testing
Blower, pump, and hydraulic equipment
7386229, G01M 1900
Patent
active
052575357
ABSTRACT:
A valve stem stress measuring instrument is provided for measuring axial thrust developed on a valve operating system. In a quarter turn valve, or a butterfly, a valve stem stress instrument comprises a pair of load sensing assemblies which are disposed on either end of the valve housing. One load sensing assembly is attached to the stop nut end of the valve housing and a second load sensing assembly is installed on the drive end portion of the housing. Load cells are disposed between the worm shaft and a fixed engagement area rigidly attached to the worm shaft housing. With the worm shaft captured between each of the load sensing assemblies, reaction thrust or stem stress can be determined on the shaft in both the open and closed positions. After calibration, the present invention provides means for determining stem torsional stress values for a butterfly valve over its full stroke, such that the valve can be tested under actual operating conditions.
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Bennett G. Bradley
Cuchlinski Jr. William A.
Panian Michael G.
Westinghouse Electric Corp.
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