Abstract: A distribution valve for a high-pressure pump comprises a closed valve housing (1), in which a valve rotor (2) is rotatably mounted. The valve rotor is adapted during rotation, preferably indexing, to alternately open and close the flow path to a series of outlet ports (8) in the valve housing, such that the pumping medium is distributed via the ports concerned out to individual nozzles disposed in a succession. The distribution valve is extended especially for use in a device for washing the interior of a building. The device comprises a carriage, which is movable back and forth and has a frame on which the nozzles are mounted.