What is a primary function of the SCBA's inhalation valve?

The primary function of the SCBA's inhalation valve is to prevent backflow. This valve plays a crucial role in ensuring that the air being inhaled by the user from the SCBA's cylinder is not contaminated by exhaled gases or outside air. When the user inhales, the inhalation valve opens, allowing breathable air to flow into the mask. Conversely, when the user exhales, the valve closes to prevent any backflow of air, maintaining the quality of the air being supplied to the user. This functionality is essential, especially in hazardous environments where the integrity of the breathable air is vital for the user's safety and health.