Apparatus and method for determining the characteristic of a flo

Details Apparatus and method for determining the characteristic of a flo Apparatus and method for determining the characteristic of a flo

1978-05-19

1979-05-08

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

73 47, G01F 2500

Patent

active

041529227

ABSTRACT:
A measuring cylinder has at its ends an inlet and an outlet connected in a fluid system in series with a flowmeter. A measuring piston is adapted to travel through the measuring cylinder as a fluid barrier. A poppet valve on the inlet side of the measuring piston is adapted to seal a passage through the measuring piston when closed so the measuring piston travels through the measuring cylinder as a fluid barrier, and to permit fluid flow through the passage when open. A retracting piston is adapted to travel through a retracting cylinder having a smaller cross-sectional area than the measuring cylinder as a fluid barrier. A rod is connected between the retracting cylinder and the poppet valve to open and close the poppet valve as the retracting piston moves relative to the measuring piston. The movement of the retracting piston through the retracting cylinder is controlled so as to hold the measuring piston at an upstream position of the measuring cylinder prior to a test run, to release the measuring piston when a test run is initiated, and to return the measuring cylinder to the upstream position after the test run. In one embodiment, the movement of the retracting cylinder is controlled during the test run to maintain a constant difference in pressure between the upstream and downstream sides of the measuring piston.

REFERENCES:
patent: 3492856 (1970-02-01), Francisco
patent: 3877287 (1975-04-01), Duntz

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