737NG引气原理图简介！ summer is the season of air conditioner malfunctioning. Understanding the principle diagram can help us diagnose more clearly. The 737NG introduces a simple and intuitive concept for air intake. In this article, we will explore the working principle of the 737NG and discuss its various components, including the PCCV PRSOV BAR sensors, pressure regulators, and valves. With a clear understanding of the principles, you can better diagnose common issues with your air conditioner and take steps to prevent future problems.