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Flow meters

  • US 5,698,793 A
  • Filed: 09/04/1996
  • Issued: 12/16/1997
  • Est. Priority Date: 09/06/1995
  • Status: Expired due to Term
First Claim
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1. A flow meter comprising:

  • a nozzle having a region which is divergent in the intended direction of flow through the flow meter,vanes which extend inwardly of the nozzle, each vane terminating at a respective radially inner free edge which extends along said region of the nozzle,a plug situated within the divergent region of the nozzle, wherein the plug having an outer surface which cooperates with the radially inner free edges of the vanes to guide the plug for displacement along said region of the nozzle, such displacement, by a pressure difference generated by the flowing fluid, varying the flow cross-section between the outer surface of the plug and the inner surface of the nozzle, andmeasuring means which is responsive to the pressure difference across the plug in the direction of flowing fluid, thereby to provide an output representing the flow rate of the fluid through the flow meter.

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