Device, system and method for automatic flushing with a multiple valve

A device for the automatic flushing of liquid lines with a liquid, the device comprising

• at least one connection for a liquid conduit,
• at least one connection for a drainage conduit,
• a flushing valve arranged between the connections for the liquid conduit and drainage conduit,
• a free discharge arranged between the flushing valve and the connection drainage conduit, and
• a backflow vessel arranged between the free discharge and the drainage conduit,
• wherein the flushing valve comprises a multiple valve with parallel valves arranged next to each other, the device further comprising a control unit, which controls the opening and closing of each valve of the multiple valves in the flushing valve, wherein the control unit is configured to vary the number of parallel opened valves from the multiple valve in a flushing procedure, depending on the size of the liquid line, with which the device is connected, wherein the flushing valve, the free discharge, and the backflow vessel are integrally connected, and wherein the backflow vessel has a volume so that, in the instance when the drainage conduit cannot drain all of the liquid, the backflow vessel is configured to fill with the liquid, thereby preventing the liquid from being forced upstream.