Dosing pump unit
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United States of America Patent
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Feb 11, 2014
Grant Date -
Jun 12, 2008
app pub date -
Dec 29, 2005
filing date -
Dec 30, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to a dosing pump unit for mixing a liquid reducing agent with an exhaust gas flow by means of a dosing pump which is connected, on the input side thereof, to a connection connectable to a reducing agent tank and, on the output side thereof, to a pressure pipe and a pipe for returning flow back to said reducing agent tank, wherein a non-return valve which is prestressed against a hydraulic pressure produced by the dosing pump is arranged in the pressure line, the return pipe is connected to the pressure pipe upstream of the non-return valve in the reducing agent flow direction and a first stop valve for selectively closing the return pipe is placed therein.
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