There are two sets of 
heart valves: the atrioventricular
valves between the atria and ventricles, and the semilunar valves
between the ventricles and aorta or pulmonary artery. Both the
atrioventricular and semilunar valves are made of dense
connective tissue covered with endocardium and have an inner
framework of fibrous tissue.
There are two atrioventricular valves: the
tricuspid
valve and the mitral valve. During diastole, the pointed ends
of the atrioventricular valves open into their respective
ventricle and blood flows freely from the atria through the
valves and into the ventricle. The valves are anchored by the
papillary muscles which are conical muscular projections attached
to the myocardium and connected to the valves by the 
chordae
tendineae.