Control valve abnormality detection method and apparatus

Details Control valve abnormality detection method and apparatus Control valve abnormality detection method and apparatus

1997-05-29

1998-06-02

Ferensic, Denise L.

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

137492, 137488, F16K 3112

Patent

active

057586861

ABSTRACT:
In a control valve abnormality detection method of detecting abnormality in a control valve, a characteristic expression representing the relationship between three factors in the normal state of the control valve is pre-set. The three factors consist of the displacement of the valve stem, a driving force from the valve stem driving device which changes upon displacement of the valve stem, and the force of the fluid which acts on one end of the valve stem through the valve. The three factors are detected on the basis of measurement result. On the basis of two factors selected from the detected three factors, the estimated value of one factor, which is not selected, is calculated by using the pre-set characteristic expression. The detected value of one factor, which is not selected, is compared with the calculated estimated value, and abnormality in the control valve is determined on the basis of the comparison result. A control valve abnormality detection apparatus is also disclosed.

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