Valves are structures that allow blood to flow smoothly through the four chambers of the heart. The heart consists of four valves — tricuspid, aortic, pulmonary and mitral valve. When any of these valves get damaged (become stiff or start leaking blood), they can cause a host of complications. During valve repair/replacement procedure, the damaged valve may be supported by inserting a ring or the surgeon may totally replace the whole valve with an artificial one or a donor valve.