Abstract
Features of noise and vibration generated by a cage-guided control valve are discussed. In this type of valve, kinetic energy of the throttled jets is dissipated by mutual collision of the jets themselves. The pressure reduction process is made considerably smooth, and the noise level becomes lower than that of a freely expanding jet. However, due to a resonance between the jets and the valve cavity, a transitional increase of noise appears remarkably in a two-jets configuration within a pressure range of low supercritical flow. For a six-jets configuration, such a noise increase is suppressed, and, instead, stem vibration of high level is induced. Finally, the configuration of two-jets makes the static thrust increase with an increasing valve opening. This feature may cause a vibration of an elastically positioned stem of the valve.
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