Diaphragm pump for use as recirculation pump in metering system in motor vehicles for metering of reducing agents, has pump housing, where separating diaphragm is arranged between suction channel and conveying channel

摘要

The diaphragm pump has a pump housing, a working diaphragm, a suction channel (21) and a conveying channel (23), where a check valve (17) is arranged in the suction channel and the conveying channel. A separating diaphragm is arranged between the suction channel and the conveying channel. A pressure spring is clamped between the pump housing and a side of the separating diaphragm facing the suction channel. The pump housing comprises two housing sections, and the separating diaphragm is clamped between the two housing sections in a sealed manner.