Flow-controlled calibration syringe

Details Flow-controlled calibration syringe Flow-controlled calibration syringe

1997-11-06

1998-10-27

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

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

417566, F04B 2102

Patent

active

058279415

ABSTRACT:
A calibration syringe is constructed like a single stage manual pump having a plunger. The input manifold has a duckbill valve that functions to maintain a fixed air flow rate through the syringe even with variable forces acting on the plunger. The duckbill valve has a pair of flexible lips which face upstream against the air flow. As a vacuum is formed inside the pump's input chamber, ambient air pressure closes the flexible lips. Thus, variable plunger forces creates a variable orifice inversely proportional to the plunger force. The result is a constant flow rate syringe.

REFERENCES:
patent: 12413 (1855-02-01), Hammer
patent: 2986098 (1961-05-01), Trout et al.
patent: 3314600 (1967-04-01), Hadley
patent: 3664774 (1972-05-01), Tupper et al.
patent: 4030495 (1977-06-01), Virag
patent: 4324127 (1982-04-01), Gazzara et al.
patent: 5076093 (1991-12-01), Jones, Jr. et al.

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