| 摘要 |
The valve includes a perforated cage and a perforated closed end tube operating as two sequential stages of restriction and pressure drop for the fluid flowing through the valve. A movable plug cooperates with the cage to control the net amount of flow restriction presented to the fluid, and hence to control the pressure drop across the valve and the rate of fluid flow through the valve. The tube perforations are sized to turn back the practical maximum of the first stage noise into the tube, and the latter is lined with material which absorbs a maximum of the turned-back noise. As a result, the level of the noise passing downstream of the valve is minimized.
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