System for evaluating the condition and performance of a valve a

Details System for evaluating the condition and performance of a valve a System for evaluating the condition and performance of a valve a

1987-08-20

1989-02-21

Yasich, Daniel M.

Measuring and testing

Blower, pump, and hydraulic equipment

7386231, F16K 3105, G01L 500

Patent

active

048054518

ABSTRACT:
A device for measuring and indicating the forces on a valve stem over at least a portion of the valve strokes is comprised of a strain sensor secured to the valve yoke for sensing strains experienced by the valve yoke. The sensed strains are proportional to the forces on the valve yoke and are equal but opposite to the forces on the valve stem. The strain sensor generates electrical signals proportional to the forces on the valve stem. A display, electrically connected to the strain sensor, is provided for receiving the generated electrical signals and for indicating the forces on the valve stem. A system for evaluating the performance of a valve and valve operator also utilizes the yoke strain sensor in combination with other sensors, including a valve stem motion sensor, a spring pack motion sensor, a motor current sensor and, possibly, a stem strain sensor, as well as an indicator of the condition of torque and limit switches.

REFERENCES:
patent: 3184962 (1965-05-01), Gay
patent: 3199057 (1965-08-01), Gindes et al.
patent: 4265110 (1981-05-01), Moulin
patent: 4542649 (1985-09-01), Charbonneau et al.
patent: 4570903 (1986-02-01), Crass
Movats Incorporated Technical Manual for "Motor Operated Valve Analysis and Test System" (1985).
EPRI (Electric Power Research Institute) Manual, "Improvements in Motor-operated Valves, " EPRI NP-45254, Project 2232-2, Interim Report, Nov. 1985.

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