The UMS pallet circulation system from MiniTec is based on a double-track chain conveyor with recirculation of the empty pallets underneath the conveying level. The off-loaded pallets are turned vertically by an interlocking gripper with return transportation hanging beneath the conveyor. Pallet accumulation is possible on the conveying level as well as on the return. The system even can be used as an overhead suspension track, returning empty pallets at the top level.