Posts Tagged: thermal expansion valve

How an Expansion Valve Works: A Simple Explanation

Learn how an expansion valve works and fails Let’s keep this simple; the job of the expansion valve is to regulate the flow of high-pressure liquid refrigerant through a small opening into the evaporator. There are two types of automotive expansion valves, but they all work on the same basic principle; the valve remains open to allow refrigerant flow until the evaporator temperature drops to a certain point. Then the valve closes to prevent superheating and evaporator freeze up. Here’s how an expansion valve works. How a remote sensing bulb … Read More