Abstract

Rapidly fluctuating flow conditions exist in various fluid power applications. Particularly, in return lines of fast on-off valves, circumstances are very demanding as rapidly changing flow rate causes large pressure variations and cavitation downstream from the valve. Pressure measurement of such flow conditions is diverse. In order to exploit the measured data, the measurement equipment and methods have to be reliable.

In this paper, several aspects affecting on dynamic pressure measurement in hydraulic return lines are dealt with. Suitability of several transducer types for such dynamic measurements is studied. The effects of various mounting methods and transducer orientations are studied as well.

Considerable differences in pressure responses were found with various transducer types. In addition, mounting method and restrictors in mounting fittings were found to be significant. Cavitation was found to be present in the return line and it affected measured responses. In the paper, pressure responses acquired with various pressure transducers and mounting scenarios are presented. The effects of mounting scenarios and orientation of transducers are discussed and measured responses are presented.

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