Method for stabilizing the flow of fluids at the time of expansion accompanied by kinetic energy degradation, a valve and a pressure reducer for carrying out said method
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United States of America Patent
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Aug 25, 1987
Grant Date -
N/A
app pub date -
Feb 25, 1985
filing date -
Mar 1, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
At the time of expansion and accompanying kinetic degradation of a flowing stream of fluid, the flow is stabilized by forming at least two contiguous flow streams which consist of the same fluid but have a different velocity distribution and the two streams are then mixed. When applying the method to a valve provided with a so-called 'hemispherical' closure member for compressible fluids, subsonic discharge nozzles are formed by cutting recesses in the valve seat downstream of the zone in which the valve closure member bears on the valve seat in the closed position. The subsonic discharge nozzles are disposed in alternate sequence with supersonic discharge nozzles formed by the opposite surfaces of the valve closure member and of the valve seat outside the recesses. When the method is applied to a multi-bore pressure reducer for compressible gases, a pressure-reducing plate is provided with low-discharge ducts in adjacent relation to high-discharge ducts.
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