Pulmonary valve One of the four valves that control blood flow in the heart. It lies between the inferior right heart chamber (right ventricle) and the artery that brings blood to the lungs (pulmonary artery). Quite often, however, this valve needs to be replaced. An artificial pulmonary valve is guided through a catheter to the problem area☝🏻. The balloon at the end of the catheter is expanded to push the new pulmonary valve into place. The transcatheter procedure can also be used to install a new pulmonary valve into a previously replaced valve that is now failing. This is called the valve-in-valve procedure.