Diagnostic system and method for a valve
First Claim
1. A diagnostic system for a valve actuated by a positioner by way of a drive, wherein the valve has a sensor for detecting structure-borne noise, the diagnostic system comprising:
- a measurement signal evaluating device that receives from the sensor a measurement signal of the structure-borne noise, wherein the measurement signal evaluating device comprises an arithmetic logic unit that;
determines a first value of a characteristic during a calibration process, wherein the first value is determined based on a first progression of the measurement signal recorded when the valve is in a closed position;
determines at least one second value of the characteristic during operation of the valve, wherein the second value is determined based on at least one second progression of the measurement signal recorded when the valve is in an almost-closed position;
compares the second value with the first value; and
generates a status signal to indicate that no leakage diagnosis is possible if the deviation of the second value from the first value does not exceed a predefined first threshold value.
1 Assignment
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Accused Products
Abstract
A diagnostic system, for a valve (2), having a sensor (12) that senses structure-borne noise and having a device (14) for evaluating a measurement signal (13) of the structure-borne noise. During a calibration process, a first progression of the measurement signal is sensed for the closed position of the valve (2) and a first value (w1) of a characteristic is determined. To simulate leakage noise, the valve (2) is nearly closed during operation, a second progression of the measurement signal is sensed and a second value (w2) is determined. If the deviation of the second value from the first value is sufficiently large, a diagnosis is possible. A third progression of the measurement signal is sensed for the closed position of the valve as in an installed condition, and a third value (w3) is determined. If the deviation of the third value (w3) from the first value (w1) is too great, and if a diagnosis has been identified as being possible, then the system deduces that the valve leaks.
39 Citations
14 Claims
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1. A diagnostic system for a valve actuated by a positioner by way of a drive, wherein the valve has a sensor for detecting structure-borne noise, the diagnostic system comprising:
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a measurement signal evaluating device that receives from the sensor a measurement signal of the structure-borne noise, wherein the measurement signal evaluating device comprises an arithmetic logic unit that; determines a first value of a characteristic during a calibration process, wherein the first value is determined based on a first progression of the measurement signal recorded when the valve is in a closed position; determines at least one second value of the characteristic during operation of the valve, wherein the second value is determined based on at least one second progression of the measurement signal recorded when the valve is in an almost-closed position; compares the second value with the first value; and generates a status signal to indicate that no leakage diagnosis is possible if the deviation of the second value from the first value does not exceed a predefined first threshold value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A diagnostic system for a valve that can be actuated by a positioner via a drive, wherein the valve has a sensor for detecting structure-borne noise, the diagnostic system comprising:
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a measurement signal evaluating device that receives from the sensor a measurement signal of the structure-borne noise; means for determining, said means for determining being in communication with said measurement signal evaluating device, and wherein said means for determining; determines a first value of a characteristic during a calibration process, wherein the first value is determined based on a first progression of the measurement signal recorded when the valve is in a closed position; determines at least one second value of the characteristic during operation of the valve, wherein the second value is determined based on at least one second progression of the measurement signal recorded when the valve is in an almost-closed position; and said diagnostic system further comprising means for comparing the second value with the first value and for generating a status signal to indicate that no leakage diagnosis is possible if the deviation of the second value from the first value does not exceed a predefined first threshold value. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A diagnostic method for a valve actuated by a positioner via a drive, wherein the valve has a sensor for detecting structure-borne noise and a device that receives from the sensor a measurement signal of the structure-borne noise, the diagnostic method comprising:
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determining a first value of a characteristic during a calibration process, wherein the first value is based on a first progression of the measurement signal recorded when the valve is in a closed position; determining at least one second value of the characteristic during operation of the valve, wherein the second value is based on at least one second progression of the measurement signal recorded when the valve is in an almost-closed position; comparing the first value with the second value; and generating a status signal indicating that no leakage diagnosis is possible if the deviation of the second value from the first value does not exceed a predefined first threshold value. - View Dependent Claims (14)
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Specification