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

1988-04-22

1989-11-14

Yasich, Daniel M.

Measuring and testing

Blower, pump, and hydraulic equipment

7386231, 364508, F16K 3105, G01L 0500, G01P 1300

Patent

active

048799017

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. In one embodiment, a second strain sensor is secured to the valve operator for sensing strains experiences by the valve operator and for generating proportional electrical signals. A display, electrically connected to the strain sensors, is provided for receiving the generated electrical signals and for indicating the forces on the valve stem and the forces on the valve operator. A system for evaluating the performance of a valve and valve operator also utilizes the yoke strain sensor in combination with the operator strain sensor and 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. In another embodiment, a vibration sensor is secured to the valve operator for sensing vibrations occurring within the valve and/or the valve operator and for generating proportional electrical signals which are displayed in conjunction with other signals for evaluation of valve and valve operator performance.

REFERENCES:
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patent: 4693113 (1987-09-01), McNennamy et al.
patent: 4735101 (1988-04-01), Charbonneau et al.
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-4254, Project 2232-2, Interim Report, Nov. 1985.

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