Multi-path pump for cleaning/washing devices in motor vehicle, uses pressure-difference valve device for closing one outlet channel at low feed pressures

摘要

A multiple flow-path pump has a pump chamber with reversible two-speed pump-rotor, at least one pressure chamber leading to a first flow channel and outputting into a first outlet channel via a pressure-difference valve device, which closes one of the outlet channels at low feed pressures and has a through-flow channel which provides an 'open' channel via a flow-connection between the channel leading to the pressure chamber and the outlet channel not closed by the valve device. An independent claim is included for a method for controlling the flow-path of a fluid, especially a cleaning fluid.