In a conveyor system for cattle fodder, which conventionally comprises a conveying tube and a plurality of discs attached to a rope sliding in the interior of said tube, a vane-like valve door for closing the discharge hopper of the conveyor comprises at least a flexible member to ensure a tight seal between the vane-like member and the conveying machine frame. Preferably, a piece of fabric is hangingly mounted on the inner face of the vane-like valve member and abuts, when the valve member is in the closed position; a corresponding flexible (fabric) member fastened to a confronting fixed portion of the conveying system. The advantage is that trapping of fodder particles between the valve member and the discharge hopper ledge is quite reliably prevented.
