US Patent 7478800 Anti-back-streaming carburetor valve

A valve for sealing a carburetor inlet of a first diameter, includes a valve element having a curved surface for sealing the inlet opening, and a through hole of substantially the first diameter extending through the valve element, and a translation mechanism for rotating the valve element between a first position wherein the curved surface completely seals the opening and a second position wherein the through hole aligns with the inlet allowing a free flow into the carburetor.