Control valve
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United States of America Patent
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Aug 21, 2001
Grant Date -
N/A
app pub date -
Dec 11, 1998
filing date -
Dec 11, 1998
priority date (Note) -
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status (Latency Note)
Importance
Abstract
Pumps and injectors having a control valve spring arrangement configured to provide a force step when the control valve is at a rate shape position, and related methods for operating a control valve, are provided. The control valve is moveable over a stroke range between an open position and a closed position. The stroke range includes a rate shape position. The control valve spring arrangement is configured to provide a first spring force when the control valve is between the closed position and the rate shape position, and to provide a second spring force that is less than the first spring force when the control valve is between the rate shape position and the open position.
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