Valve Actuator Diagnostics via Timing Analysis
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Solution Overview
Problem
Gas safety shut-off valves often fail unexpectedly due to undetected degradation, leading to sudden 'no heat' situations, as their health is not regularly monitored, necessitating early detection of impending failures for maintenance planning.
Innovation Solution
A system incorporating an internal controller, proof-of-closure sensor, and current/voltage monitor to measure time delays between actuator power application and valve opening/closing, comparing these to thresholds and previous measurements to detect gradual degradation and alert users before valve failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If valve health monitoring is implemented by adding dedicated monitoring hardware, then reliability of valve operation is improved, but device complexity increases
Solution Approach 1:
The patent makes existing components serve dual purposes: the controller that manages valve operation also monitors timing parameters, the actuator that moves the valve also serves as the timed object for measurement, and the proof-of-closure sensor that verifies valve position also provides timing detection capability. This multi-functionality approach enables comprehensive valve health monitoring without adding dedicated monitoring hardware, thus improving reliability while avoiding increased device complexity.
Solution Approach 2:
The valve system performs self-diagnosis by using its own operational parameters (timing between actuator activation and valve response) to monitor its own health status. The controller measures timing parameters during normal operation and compares them against thresholds to detect degradation, enabling the system to self-monitor without external monitoring equipment, thereby improving reliability without adding system complexity.
2Productivity
If timing measurements are performed during normal operation, then productivity is maintained, but measurement precision may be affected by operational variability
Solution Approach 1:
The system establishes predetermined timing thresholds before operation based on optimal valve performance characteristics. During operation, actual timing measurements are continuously compared against these pre-established thresholds to detect deviations indicating degradation. This preliminary setup allows continuous monitoring during normal operation while maintaining measurement precision by referencing stable baseline values.
Solution Approach 2:
The controller continuously measures timing parameters during valve operation and provides feedback by comparing actual timings against predetermined thresholds. When timing deviations exceed thresholds, the system generates alerts indicating potential degradation. This feedback mechanism enables continuous productivity maintenance while achieving reliable measurement precision through iterative comparison and adjustment during operational cycles.
Data Source
AI summary
A system for detection of degradation of a valve mechanism by measuring, for example, the time between powering an actuator and opening of the valve or the time between un-powering the actuator and closing of the valve. Time measurements may be compared with a predetermined threshold or previous measurements. An indication of a gradual degradation of the valve may be detected by an evaluation of a trend of measurements. Thus, a user may be notified of an impending failure before an actual failure of the valve. Diagnostic analysis may be of one or more items selected from a group consisting of combinations of time delays and distances of valve movement upon application and removal of power to the actuator, and one or more performance issues may be correlated for each of many combinations.