This critical transition is where the expansion valve comes into play, converting the high-pressure liquid into a mixture of liquid and vapor that can efficiently absorb heat. This reduction in pressure allows the spring to push the needle closer into the orifice, restricting the flow of refrigerant.
Refrigerant Flow Through Expansion Valve: Pressure Drop and Phase Change
Conversely, a valve that is stuck closed will starve the evaporator, causing high superheat, hot air from the vents, and compressor overheating. Capacity Control and Efficiency Unlike older systems that used fixed orifices, the expansion valve modulates the refrigerant flow in real-time.
This constant balancing act ensures the evaporator operates at its saturation point, maximizing efficiency. After leaving the condenser, the refrigerant is a high-pressure liquid.
Understanding Refrigerant Flow Through the Expansion Valve
At this stage, it requires a mechanism to restrict its flow and allow it to expand and cool significantly before entering the evaporator coils. While the valve itself is often not serviceable and must be replaced, ensuring that the refrigerant is clean and the system is free of moisture is critical.
More About How does an a/c expansion valve work
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More perspective on How does an a/c expansion valve work can make the topic easier to follow by connecting earlier points with a few simple takeaways.
