Apparatus and method for calibrating float valve
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United States of America Patent
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Sep 21, 1999
Issued Date -
N/A
app pub date -
Oct 29, 1997
filing date -
Oct 9, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved apparatus and method for calibrating a float-type vent valve for use in an automobile fuel tank. The valve is provided with a calibration plate in the lower end thereof below the float, the calibration plate defining an axially-adjustable support for the spring which balances the float. The calibration plate includes a force probe aperture through which a force measuring device of known type can be inserted to measure the downward force of the spring-balanced float at a specified distance from closure, preferably a near-closed position. The calibration plate then is adjusted up or down as needed until a position is determined where the spring-balanced float is properly calibrated, and then the calibration plate is permanently secured in place on the valve body so that the valve remains calibrated.
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