A centrifugal pump (100) for processing molten urea having: an inlet (102) adapted to receive molten urea at a suction pressure; a delivery outlet (104) adapted to allow an output of molten urea at a delivery pressure greater than the suction pressure; and an intermediate outlet (103) adapted to allow an output of molten urea at an intermediate pressure greater than the suction pressure and lower than the delivery pressure.

A pump assembly includes an electric drive motor (4, 6), an impeller, driven by the drive motor (4, 6), and a valve device (18) situated in a flow path through the pump assembly, which is movable between a first and a second switching position. The valve device (18) is coupled to the drive motor via a first coupling such that a movement of the drive motor (4, 6) is transmitted onto the valve device (18) and the valve device is movable from the first into the second switching position by rotation movement of the drive motor. The first coupling is releasable by way of increasing the speed of the drive motor (4, 6) and/or increasing the pressure at the outlet side of the impeller and/or by way of slip, such that the coupling between the drive motor (4, 6) and the valve device (18) is reduced or lifted.

Introduced is a flow path conversion pump comprising: an inlet pipe for guiding a flow of water, an impeller housing having an impeller built therein, and including a first housing outlet and a second housing outlet formed parallel to a tangential direction of rotation of the, a flow path switch forming an internal space, including a first switch inlet and a second switch inlet, which communicate with the first housing outlet and the second housing outlet, respectively, and including a first outlet and a second outlet, which communicate with the first switch inlet and the second switch inlet, respectively, a diaphragm disposed in the internal space of the flow path switch, separating the first switch inlet and the second switch inlet, and separating the first outlet and the second outlet and a motor connected to the impeller to transmit power.

A pump assembly and method is disclosed comprising, a pump including a pump housing having a fluid inlet and at least one fluid outlet extending from the pump housing. A magnetic body of a brushless DC motor is submerged in the fluid and drives an impeller that moves the fluid from the fluid inlet to the at least one fluid outlet. A valve rotatably mounted between the impeller and the at least one fluid outlet selectively directs the flow of fluid through the at least one fluid outlet.

A pump assembly is disclosed comprising a pump body having a first pump stage housed in the pump body including a fluid inlet and a first and a second fluid outlet. A flow feed chamber is housed in the pump body in fluid communication with the second fluid outlet. A second pump stage housed in the pump body is in fluid communication with the flow feed chamber and includes at least one fluid outlet connected to the second pump stage. A valve assembly is operable into a first position to fluidically connect the fluid inlet through the first pump stage to the first fluid outlet. The valve assembly is further operable into a second position to fluidically connect the first pump stage to the second fluid outlet and the flow feed chamber and the flow feed chamber fluidically connected to the at least one fluid outlet through the second pump stage.

A method controls a circulation pump (1) in an installation with at least two circulation circuits (3, 4), with which the circulation pump (1) is integrated by way of a switch-over valve (2) into the one or the other circulation circuit (3 or 4) depending on the switched position. The pump (1) is activated differently depending on the switched position of the switch-over valve (2). The switch-over procedure is detected by way of determining the pressure course and/or the flow rate course in the pump (1) or an electrical variable which is dependent thereon, of the motor driving the pump, and the pump (1) is operated in another manner accordingly.

A centrifugal pump assembly includes an electric drive motor (6, 8), a driven impeller (14) and a pump casing (2) which surrounds the impeller (14). A movable element (24; 24) is arranged a valve element. A section of the valve element is movable from a released position into a bearing position, fixed on a contact surface (60), by pressure which is produced by the impeller in the pump casing. A control device (64) moves the valve element from one switching position into another switching position and reduces the speed of the drive motor. Upon pressure in the pump casing dropping such that the valve element is no longer fixed on the contact surface and the valve element has been moved into the other switching position, the control device increases the speed of the drive motor again. A method for moving a valve element is provided.

A centrifugal pump assembly includes an electrical drive motor (2), with at least one impeller (18) which is driven by the motor and a pump casing (6) which surrounds the impeller (18) and which includes at least one suction connection (20) and at least two delivery connections (22, 24). A rotatable valve element (30, 30, 30) is arranged in the pump casing (6). The valve element is movable between at least two switching positions, in which the flow paths through the delivery connections (22, 24) are opened to a different extent. The valve element (30, 30, 30) includes an annular wall (32) which surrounds the impeller (18) and in which at least one switching opening (48) is formed. The valve element (30, 30, 30) is rotatably mounted about a rotation axis (X), which is centric to the annular wall (32), inside of the pump casing (6).

A motor vehicle may include an internal combustion engine, a radiator, a heat exchanger, a coolant pump, and a valve device arranged separately therefrom, which is controlled at an intake side by pressure. The valve device may include at least one first coolant inlet, at least one second coolant inlet, and a coolant outlet connected to an inlet of the coolant pump. The valve device may be configured to, based on a selected operating point of the coolant pump and a pressure in a coolant, at least one of open and close at least one of the at least one first coolant inlet and the at least one second coolant inlet. The at least one first coolant inlet and a coolant outlet of the coolant pump may be connected to the internal combustion engine, and the at least one second coolant inlet may be connected to the radiator.

A pump assembly includes an impeller (18), which for rotation is connected to an electrical drive motor (20) which can be driven in two rotation directions (A, B) and a valve (10) situated in an inlet of the pump assembly. The valve includes a valve element (48) movable between at least two switch positions and is connected for movement to a drive element (36, 60) subjected to the flow produced by the impeller (18). The valve element (48), in at least a first of the two switch positions, closes an inlet channel (44, 46) of the pump assembly (12) and is arranged such that the movement direction into this first switch position corresponds to the flow direction (S1, S2) through this inlet channel (44, 46). A hydraulic system is provided with two circuits and such a pump assembly. The valve serves as a switch-over valve between the two circuits.