What is the purpose of the condensate drain valve in the air supply rack assembly?

The condensate drain valve in the air supply rack assembly serves the important function of relieving excess pressure. As compressed air is stored, moisture and other contaminants can accumulate within the air supply system. Without a means to manage this buildup, pressure can increase to levels that may potentially damage the equipment or interfere with its operation. By allowing for the safe release of this excess pressure, the condensate drain valve helps maintain optimal performance and safety of the diving system.

In the context of the other options, filtering impurities and enhancing air quality are related to different components within the air supply assembly, such as filters and air quality monitors, which are designed to remove particulates and ensure that the air delivered is safe to breathe. Controlling gas pressure is typically managed by regulators rather than a condensate drain valve, which is specifically focused on pressure relief in the context of excess moisture and condensate.