Measuring and testing – Volume or rate of flow – Tank type
Patent
1976-01-05
1976-10-12
Watkins, Donald E.
Measuring and testing
Volume or rate of flow
Tank type
G01F 122
Patent
active
039850293
ABSTRACT:
An improved fuel flow meter construction for visually indicating the flow rate of fuel therethrough. A vertically extending tubular body has a central vertically extending bore with a sight glass mounted on its upper end, and has an indicating needle vertically movable within the body and sight glass. A hollow sleeve is mounted within the bore of the tubular body and has a metering orifice formed at its bottom end. A vapor deflector is mounted on the upper open end of the sleeve. An intermediate portion of the sleeve is spaced from the bore wall and forms an outer downstream fuel passage therebetween which communicates with a fuel outlet line connected to the tubular body. The interior of the sleeve provides an inner upstream fuel passage above the orifice and communicates with a fuel inlet line connected to the tubular body below the metering orifice. Fuel outlet ports are formed in the top portion of the sleeve connecting the inner fuel passage with the outer fuel passage. The metering needle has a tapered metering portion which extends freely movably through the orifice, and the top portion of the metering needle extends through a closely controlled complementary hole formed in the vapor deflector. The metering needle raises and lowers within the sight glass depending upon the rate of fuel flow through the metering orifice providing a visual indication of the fuel flow rate. The vapor deflector reduces the accumulation of fuel vapors in the sight glass, and the inner and outer fuel passages reduce turbulence adjacent the metering orifice, thereby improving the accuracy of the metering of the fuel flow rate.
REFERENCES:
patent: 3117446 (1964-01-01), Green
patent: 3133441 (1964-05-01), Conkling
Beauchamp John P.
Watkins Donald E.
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