FIELD: engines and pumps.
SUBSTANCE: in compliance with some versions, pump units comprise intake channel communicated with urea solution source and pump chamber. Outlet channel is communicated with the pump chamber and exhaust gas postprocessing system. Membrane is directed to the pump chamber and coupled with the actuator. First casing is connected with the second one to make a seal around the pump chamber. Leak collection chamber surrounds the seal. Bypass channel is communicated with leak collection chamber and intake channel. Urea solution flowing from pump chamber through said seal gets into leak collection chamber and, via bypass channel, into the pump intake channel.
EFFECT: decreased urea leaks.
20 cl, 12 dwg
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