Fuel pump control valve assembly
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United States of America Patent
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May 9, 2000
Issued Date -
N/A
app pub date -
Jul 30, 1999
filing date -
Jun 23, 1995
priority date (Note) -
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Abstract
A fuel pump or injector has a control valve with a piston valve body axially movable over a motion displacement interval defined by first and second sub-intervals. A first control valve spring causes the piston valve body to be biased toward the unactuated position whenever the piston valve body is in the first sub-interval. A second control valve spring causes the piston valve body to be biased into damped engagement with the valve stop whenever the piston valve body is in the second sub-interval.
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