Pulmonary valve (tricuspid) valve indicates some blood back flows into the left ventricle rather than into circulation. The number you give represents mild to moderate regurgitation.
Usually, the condition is watched by echo for any progression, and the ace inhibitor and beta blocker you are prescribed is the proper medication.
The tricuspid leaflets do not completely close over the orifice (valve opening) you stated. Sometimes as one ages there is some calcification and stiffness of the leaflets and orifice that impair closing. The echo reports the valve are structually normal thereby eliminating congenital defects. Without operational intervention, there is no remedy and often no symptoms until or if regurgitation becomes severe. No pulmonary hypertension and heart chambers are normal dimensions is a possitive.