| 摘要 |
The present invention is directed to a venturi arrangement for use in measuring the flow rate of a fluid passed through a pipe bearing a venturi wherein the drawbacks associated with prior configurations have been ameliorated. The novel venturi arrangement comprises a pipe having a diameter, D, supplied in two sections, an upstream section and a downstream section, each of which preferably is flanged. Each of these pipe sections is fitted with a pair of pressure taps. A venturi comprising an annulus of diameter, D, has edges which are welded to said pipe sections to form an integral, fluid-conveying unit. A curvilinear conveying inlet section is integrally formed with the annulus. A throat section is integrally formed with the curvilinear conveying inlet section and contains a pair of pressure take-off apertures, each of which is connected by a flexible line to the downstream pipe pressure taps. Finally, a diverging diffuser section is integrally formed with the throat section. The diffuser section is not welded to or otherwise in contact with the pipe (i.e. free end). The pipe pressure taps are connected to a calibrated differential pressure transmitter in order to measure flow rates of fluids, e.g. steam and water, passed through the venturi arrangement.
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