Abstract: A centrifugal pump device has at least one impeller (16), a circulation connection between a delivery side (22) of the at least one impeller (16) and a suction side (20) of the at least one impeller (16), and a valve arrangement (30, 46) in said circulation connection (44, 54). The valve arrangement (30, 46) has a first valve mode providing a pressure dependent shut-off valve (46) in the circulation connection. The valve arrangement (30, 46) allows a change between the first valve mode and at least one further valve mode. The at least one further valve mode provides at least one fixed closing degree of the circulation connection (44, 54).

Abstract: A centrifugal pump device has at least one impeller (16), a circulation connection between a delivery side (22) of the at least one impeller (16) and a suction side (20) of the at least one impeller (16), and a valve arrangement (30, 46) in said circulation connection (44, 54). The valve arrangement (30, 46) has a first valve mode providing a pressure dependent shut-off valve (46) in the circulation connection. The valve arrangement (30, 46) allows a change between the first valve mode and at least one further valve mode. The at least one further valve mode provides at least one fixed closing degree of the circulation connection (44, 54).

Abstract: A base for pumping devices, the base comprising at least one module with which it is possible to mate one pumping device, the module comprising an intake connector and a delivery connector in order to connect respectively the intake and the delivery of the pumping device respectively to a first tubular element and to a second tubular element to which they are essentially perpendicular, the two tubular elements, the first one and the second one, passing through the base from a first lateral face thereof to an opposite second lateral face thereof, from which they face outward in order to be connected, selectively at either face, to a hydraulic system.

Abstract: A waste water lifting installation includes a collection container (2) and a flange plate (4) which is arranged on the upper side of the collection container (2) and on which a level switch (12) immersing into the collection container (2) is attached. At least one run-in pipe (22), departing from the flange plate (4), extends vertically downwards into the collection container (2) and has such a vertical length that the lower end (28) of the run-in pipe (22) is vertically distanced further from the flange plate (4) than a lower end of the level switch (14).

Abstract: A base for pumping devices, the base comprising at least one module with which it is possible to mate one pumping device, the module comprising an intake connector and a delivery connector in order to connect respectively the intake and the delivery of the pumping device respectively to a first tubular element and to a second tubular element to which they are essentially perpendicular, the two tubular elements, the first one and the second one, passing through the base from a first lateral face thereof to an opposite second lateral face thereof, from which they face outward in order to be connected, selectively at either face, to a hydraulic system.

Abstract: A waste water lifting installation includes a collection container (2) and a flange plate (4) which is arranged on the upper side of the collection container (2) and on which a level switch (12) immersing into the collection container (2) is attached. At least one run-in pipe (22), departing from the flange plate (4), extends vertically downwards into the collection container (2) and has such a vertical length that the lower end (28) of the run-in pipe (22) is vertically distanced further from the flange plate (4) than a lower end of the level switch (14).

Abstract: A pump assembly is buoyant and includes an electrical drive motor (16), a centrifugal pump driven by the motor, and an assembly housing (2) accommodating the drive motor (16) and the centrifugal pump. Moreover, the pump assembly includes at least one inlet opening (8) which is arranged below the fluid surface (6) in the floating condition, and at least one outlet opening (10, 12). The assembly housing (2) is arranged such that on reaching a contact surface, the assembly housing changes its alignment with respect to the floating position.