What does the outflow valve primarily regulate?

The outflow valve primarily regulates air leaving the cabin. In aircraft environmental control systems, this valve plays a crucial role in managing cabin pressure. By controlling the release of air from the cabin, it helps maintain the desired atmospheric pressure within the aircraft as it ascends or descends. This regulation is essential for passenger comfort and safety, ensuring that the cabin environment can sustain a safe and breathable atmosphere.

While other components of the aircraft are responsible for fuel delivery, engine temperatures, and engine pressures, the outflow valve specifically targets the control of cabin air pressure, making it a vital part of the aircraft's pressurization system.