Transient Phenomena Caused by Directional Control Valve in a Hydraulic Pipeline

概要

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This paper deals with the surge pressure and pressure fluctuation in a pipe caused by the instantaneous operation of a valve in a hydraulic system made up of an accumulator, a directional control valve and a pipeline. Theoretical and experimental results indicate that when the valve attached to one end of the pipe is operated rapidly and a step change in pressure is applied to the pipeline, the surge pressure which is caused by the spool-type directional control valve is proportional to the spool velocity. Moreover it is shown that the period and the logarithmic decrement of the pressure fluctuation at the other end are influenced only by a dimensionless quantity defined as the square of the radius of the pipe times the natural frequency of the fluid column divided by the kinematic viscosity ; in other words, the pressure fluctuation is similar in cases where the values of this dimensionless quantity are equal to each other.
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