Measuring and testing – Volume or rate of flow – System
Patent
1983-10-04
1985-07-16
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
System
7386161, 7386164, G01F 142, G01F 144
Patent
active
045288470
ABSTRACT:
A flow metering device of the type operative for producing a pressure differential comprises a shaped tubular member having sequentially disposed inlet, converging, and throat sections, and a downstream diverging section for energy recovery. Inner annular recesses, preferably having substantially sharp leading edges, are provided in the interior of the device in or adjacent the inlet and throat sections, and pressure taps for sensing the fluid pressures in the inlet and throat sections communicate with the interior of the device through the recesses. The taps are preferably positioned adjacent the leading edges of the respective recesses so that they are shielded from the direct flow of fluid in the device to provide true static pressure readings which are unaffected by the configurations of the inner ends of the taps. Accordingly, highly accurate operations can be effected with the device using bench calibrated discharge coefficients. In the preferred embodiment of the device, a third tap is provided in the converging section so that a magnified differential between the inlet and converging sections can also be monitored.
REFERENCES:
patent: 1850030 (1932-03-01), Pardoe
patent: 2127501 (1938-08-01), Dall
patent: 2704555 (1955-03-01), Dall
patent: 2984105 (1961-05-01), Nagel et al.
patent: 4231262 (1980-11-01), Boll
D. Halmi And Associates Inc.
Ruehl Charles A.
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