What type of damper functions similarly to a check valve?

A relief damper operates in a way that is analogous to a check valve because it allows airflow in one direction while preventing backflow. Just like a check valve facilitates the flow of fluid in one direction and blocks it in the reverse direction, a relief damper opens to relieve excess pressure or allow for the escape of air under specific conditions, thereby maintaining system efficiency and safety. This is particularly important in applications where pressure buildup needs to be managed to prevent damage or ensure proper ventilation.

In contrast, control dampers are used to regulate airflow and maintain desired temperature or pressure levels, balancing dampers are utilized to distribute airflow evenly across a system, and smoke dampers are specifically designed to close off airflow in the event of a fire to prevent the spread of smoke. None of these serve the primary function of preventing reverse airflow like the relief damper does.