Patent ID: 6866444

Claim:
A device installed at a ditch on a road for preventing a backflow of sewage and a malodor, including: a frame portion comprising a plurality of frames arranged in parallel with each other; a valve portion inserted into recesses that are formed in upper sides of the frames along a perpendicular direction to a lengthwise direction of the frames, the valve portion being opened or closed in a manner of a lever according to the weight of a flow of the sewage; and a cover portion for covering the frame portion and the valve portion to protect the frame portion and the valve portion from an external force wherein the cover portion includes: flat drain holes formed in plural lines which are arranged in parallel with each other, each of the lines being provided with a plurality of passage holes formed therein; flow velocity resistance embossings which are disposed along the lines of the flat drain holes one by one, the flow velocity resistance embossings protruding upwardly with a predetermined height in a bar shape; inclined drain holes formed at both ends of the lengthwise direction and inclined upwardly; and a plurality of sliding prevention embossings protruding upwardly from an upper surface of the cover portion, for preventing walkers from sliding thereon.