| 20100263750 | MULTI-LEVEL MEMBRANCE SUCTION PUMP - A multi-level membrane suction pump having at least two pump chambers is provided, each having a fluid inlet with at least one inlet valve and a fluid outlet with at least one outlet valve, and having a suction line connecting the fluid inlets of the pump chambers. Successive pump chambers are connected to each other via at least one connecting line such that the membrane pump upon reaching/exceeding a differential pressure in the suction line changes from a parallel operation of the pump chambers into at least also a serial operation of the pump chambers. In the inflow and outflow regions of the at least one connecting line, at least one check valve each is interposed, opening toward the subsequent pump stage. In the membrane suction pump, the check valves provided in the inflow and in the outflow regions of the connecting line(s) are designed smaller compared to the inlet and outlet valves of the pump chambers, and line sections of the connecting lines that open toward the neighboring pump chamber have a smaller clear line cross-section compared to the inlet and outlet valves, and are associated with the check valves. | 10-21-2010 |
