Abstract: A pump assembly includes pump casing (2), an impeller (14) rotatably arranged in the pump casing, a two rotation directions (A, B) electrical drive motor connected to drive the impeller and a valve arrangement (28) arranged in the pump casing to switch a flow path downstream of the impeller between two exits (24, 26) of the pump casing, depending on a rotation direction of the impeller. The valve arrangement includes a first movable valve element (34) at a first exit (24) and a second movable valve element (36) at a second exit (26). The first valve element partly closes the first exit in a closed position and is movable into an opened position by flow in the first rotation direction and the second valve element partly closes the second exit in a closed position and is movable into an opened position by flow in the second rotation direction (B).

Abstract: A pump assembly includes pump casing (2), an impeller (14) rotatably arranged in the pump casing, a two rotation directions (A, B) electrical drive motor connected to drive the impeller and a valve arrangement (28) arranged in the pump casing to switch a flow path downstream of the impeller between two exits (24, 26) of the pump casing, depending on a rotation direction of the impeller. The valve arrangement includes a first movable valve element (34) at a first exit (24) and a second movable valve element (36) at a second exit (26). The first valve element partly closes the first exit in a closed position and is movable into an opened position by flow in the first rotation direction and the second valve element partly closes the second exit in a closed position and is movable into an opened position by flow in the second rotation direction (B).

Abstract: An audience response system comprising: at least one audience means for communicating with the system and displaying information to audience members; a presenter means for communicating with the system and displaying information to the presenter; a central server storing and analyzing data associated with the system and adapted to allow at least one audience means and the presenter means to communicate with the system using at least one common communication network and protocol; at least one communications network facilitating transmission of data among the server, audience means and presenter means; and a display means for showing an output of the system to the audience. The system may be adapted to use at least one selected from a cellular telephone, a wired computer network, and a wireless computer network, and the audience and presenter may use cellular telephones, personal computers, personal digital assistants, and digital web-enabled music devices to communicate with the system.