Abstract: A bi-directional valve constructed and arranged for insertion into the esophagus in the vicinity of its lower gastroespohageal sphincter for permanent installation comprises an outer cylindrical housing that engages the inner wall of the esophagus and suspends a flexible conically or pyramidally shaped body having an open base facing the proximal (upper) end of the esophagus, a converging wall housing an upper open portion closable by an upper valve and a rounded apex having a lower slot valve facing the distal (lower) end of the esophagus.