What are the 4 main valves in the heart, and where are each of them located?

Mitral valve and tricuspid valves control blood flow from the atria to the ventricles. Mitral on the right side, and tricuspid on the left side of the heart

Aortic valve controls blood flow between the left ventricle and the aorta

Pulmonary valve controls blood flow between the right ventricle and the pulmonary arteries.