FIELD: engines and pumps.
SUBSTANCE: dosing pump unit for adding liquid reducing agent to exhaust gas flow consists of pre-mixing device (39) in which in mixing zone (18) the supplied reducing agent is mixed with compressed gas. In pre-mixing device (39), in supply line (16) of the reducing agent and in the direction of flow in front of mixing zone (18) there located is the first check valve (20) adjacent directly to mixing zone (18) so that compressed air flows directly through the outlet side of that check valve (20).
EFFECT: preventing solidification in the mixing zone by removing the whole reducing agent from that zone by means of compressed air.
13 cl, 5 dwg
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