The mitral valve does this between the left atrium and ventricle. The "lub" is the sound of the tricuspid and mitral valves closing. Each of your heart's ventricles has an outlet valve. The right ventricle uses the pulmonary valve to help move blood into the pulmonary arteries.About Your Heart > How Does Blood Flow Through the Heart ...www.leehealth.org/cardiaccare/about/blood_heart.asp