Membrane pump used for conveying a medium for treating exhaust gases in diesel engines comprises a suction side and a pressure side that are short-circuited by a self-cleaning throttle point bridging a sealing region

摘要

Membrane pump for a liquid medium comprises at least one suction valve (2) and at least one pressure valve, each having a membrane that rests tightly with a sealing region (16) on a counter-sealing surface, and a suction side and a pressure side. The suction side and the pressure side are short-circuited by at least one self-cleaning throttle point (21) bridging the sealing region. Preferred Features: The medium is a 32.5% urea/water solution. The throttle point is a groove in the upper side of the membrane of the suction and pressure valve.