FLOW METERS WITH IMPROVED BLOCKING AND DISPLACEMENT ROTORS

摘要

A flow meter with a metallic case and bearing plates but with a blocking rotor and displacement rotors that are polymeric. The rotors may be sized for a reduced clearance between the rotors and surfaces of the case, bearing plates and blocking rotor. Using closer clearances between the rotors and the case bearing plates reduces leakage and provides for a more accurate measurement of the fluid through the flow meter.