| 摘要 |
<p>An improved apparatus and method for calibrating a float-type vent valve (20) for use in an automobile fuel tank (10). The valve (20) is provided with a calibration plate (24a) in the lower end thereof below the float (22a), the calibration plate (24a) defining an axially-adjustable support for the spring (22b) which balances the float. The calibration plate (24a) includes a force probe aperture (24d) through which a force measuring device of known type can be inserted to measure the downward force of the spring-balanced float (22a) at a specified distance from closure, preferably a near-closed position. The calibration plate (24a) then is adjusted up or down as needed until a position is determined where the spring-balanced float (22a) is properly calibrated, and then the calibration plate (24a) is permanently secured in place on the valve body (20a) so that the valve (20) remains calibrated.</p> |
