The purpose of installing a dump valve can be one, or a few, of many things. The primary functions that dump valves accomplish are making an often desired noise--unique to turbochargedvehicles as air releases, allowing air to escape without backtracking through the airflow chambers, eliminating rattling in the turbocharger caused by backward airflow, increased fuel economy and lowered emissions.
Research has not been conclusive as to whether dump valves increase the life of a turbocharger, but many believe that the elimination of rattling caused by backward airflow can prolong the life of equipment.
Myśle że ostatni akapit dobrze podsumowuje dyskusję :-)