March 2006

Special Report: Instruments and Networks

Predicting cavitation damage in control valves

New method evaluates noise in the ultrasonic range

Kiesbauer, J., Vnucec, D., Samson AG; Roth, M., Stoffel, B., Darmstadt University of Technology

Cavitation can occur in control valves handling fluids, causing loud noise as well as damaging valve components. This ultimately leads to additional costs in process plants. A standardized procedure to evaluate destructiveness of cavitation does not exist, whereas noise emission can reliably be predicted with the new international EN 60534-8-4 standard. A new method solves this problem by evaluating structure-borne noise in the ultrasonic range. Cavitation in control valves. The pressure of the process medium changes as it passes through the valve. Key pressures related to the inner flow path include the input pressure, p1, the pressure at the narrowest point, pvc (vena contracta), and the

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