Vacuum Check Valve

Vacuum Check Valve:

The Vacuum Check Valve allows vacuum to be applied in one direction only. The check valve is designed maintain a steady vacuum application to a component or within a vacuum line. This helps to reduce any rapid fluctuations and/or sudden drops in the vacuum signal, due to engine load or acceleration. When vacuum is applied to one side of the check valve, it should hold. When applied to the other side of the check valve, vacuum should not be drawn allowing free airflow.