Smooth-opening, low-hysteresis ball head valve
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United States of America Patent
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Oct 19, 1993
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N/A
app pub date -
Feb 18, 1993
filing date -
Feb 18, 1993
priority date (Note) -
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Abstract
A smooth-opening, low hysteresis, pressure-operated ball head valve connected between a fuel tank and vapor trap in a vehicle fuel system for providing smooth, two-stage, low hysteresis vapor flow. The ball valve element is positioned within a cylindrical retainer in the valve body, and the dimensions of the various valve orifices and the geometry of the retainer are determined in view of a specified lift off pressure and ball weight to achieve these flow characteristics.
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