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AssigneeGrundfos Management A/S
InventorsHans Henrik Jochumsen, Niels Stubager Kiemer, Karim Lindberg, Niels Torp Madsen, Tom Johansen
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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 (2) which is connected, on the input side thereof, to a connection connectable to a reducing agent tank (4) and, on the output side thereof, to a pressure pipe (16) and a pipe (10) for returning flow back to said reducing agent tank (4), wherein a non-return valve (20) which is prestressed against a hydraulic pressure produced by the dosing pump (2) is arranged in the pressure line (16), the return pipe (10) is connected to the pressure pipe (16) upstream of the non-return valve (20) in the reducing agent flow direction and a first stop valve (12) for selectively closing the return pipe (10) is placed therein.
A metering pump assembly for admixing a fluid reduction agent into an exhaust gas flow, with a metering pump which on the entry side is connected to a connection for connecting to a reduction agent tank, and at the exit side is connected to a pressure conduit as well as a return conduit to the reduction agent tank, characterized in that
Dependencies are inferred from the claim text.