Where is the tricuspid valve located?

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Understanding valve location in the heart is the key idea here. The tricuspid valve sits on the right side of the heart, at the junction between the right atrium and the right ventricle. It opens to let blood flow from the right atrium into the right ventricle during relaxation (diastole) and closes when the right ventricle contracts to prevent backflow into the atrium. This is different from the mitral valve, which is between the left atrium and left ventricle, and from the pulmonary valve, which sits between the right ventricle and the pulmonary trunk. There isn't a valve between the left atrium and the right ventricle.