PUMP UNIT
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United States of America Patent
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Issued Date -
Nov 5, 2015
app pub date -
Nov 14, 2013
filing date -
Dec 18, 2012
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Abstract
A pump unit for a fuel injection system is disclosed. The pump unit has a low pressure fuel supply line and a high pressure fuel outlet. A pumping chamber having a plunger is operable to perform a pumping cycle comprising a pumping stroke and a filling stroke. The pump unit also includes an inlet valve having an inlet valve member movable between an open position for permitting the supply of fuel to the pumping chamber from the low pressure fuel supply line and a closed position for inhibiting the supply of fuel from the pumping chamber to the low pressure supply line. An outlet valve is provided in the high pressure fuel outlet. The pump unit also includes means for coupling the plunger to the inlet valve member. The present application also relates to a method of operating a pump unit; and a valve for a fuel injection system.
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