| 摘要 |
The invention relates to a positive displacement pump, comprising a drive unit and a pump unit having several working chambers, several displacement elements, and at least three cylinders, preferably exactly three cylinders, wherein the pump unit is double-acting. The invention further relates to a piston diaphragm pump forming a positive displacement pump, wherein a diaphragm stroke is caused by means of working liquid present on the first side of a diaphragm and a medium to be pumped is conducted through a diaphragm chamber bounded by the second side of the diaphragm due to the diaphragm stroke, and the diaphragm stroke is caused at a diaphragm position different from a vertical position of the diaphragm. 2705416vl WO 2013/045598 PCT/EP2012/069160 |
