There are four valves within your heart. They are the mitral, tricuspid, aortic and pulmonic valve.
The mitral valve and tricuspid valve lie between the atria (upper heart chambers) and the ventricles (lower heart chambers). The aortic valve and pulmonic valve lie between the ventricles and the major blood vessels leaving the heart.
As blood leaves each chamber of the heart, it passes through a valve. Your heart valves make sure that blood flows in only one direction through your heart.