Abstract
The valve noise due to cavitation has frequently posed serious problems with the increase of an operating pressure. For poppet valves in different shapes, we have carried out noise tests and numerically simulated oil fl ows under an assumption of non-cavitating conditions in various configurations of the valves by a finite difference method. In addition we have performed the measurements of pressure at two locations in a valve chamber and the flow visualization, employing two-dimensional models. By comparison of measured and computed results, some design criteria can be set up for the low noise valves.
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