Heart valve disease takes place when the heart valves do not tasks, heart valves lie at the outlet of each of four heart chambers and maintain one-way blood flow through heart. The four heart valves produce sure that blood always flows freely in a forward direction and that there is no reversed leakage. Blood flows from right and left atria into ventricles through the unblocked tricuspid and mitral valves. When the ventricles are full, the tricuspid and mitral devices shut. This prevents blood from flowing backward into the atria while the ventricles contract.