Tricuspid valve: It regulates the flow of blood from right auricle to right ventricle and prevents the backflow of blood. The tricuspid valve — which lies between the two chambers on the right side of your heart — consists of three flaps of tissue called leaflets. Its opening is guarded by the tricuspid valve, so called because it consists of three irregularly shaped cusps, or flaps.
Mitral valve: It regulates the flow of blood from left auricle to left ventricle and prevents the backflow of blood. If mitral valve prolapse, the leaflets of the mitral valve bulge (prolapse) into the left atrium like a parachute during the heart's contraction. One of the main causes of mitral valve stenosis is rheumatic heart disease. This is where an infection causes the heart to become inflamed. Over time, it can cause the flaps of the mitral valve to become hard and thick.
Pulmonic valve: It prevents the backflow of blood from pulmonary artery. The pulmonic valve divides the right ventricular outflow tract from the pulmonary artery. In normal conditions, the pulmonic valve prevents regurgitation of deoxygenated blood from the pulmonary artery back to the right ventricle.