The expansion valve is designed so that the temperature of the refrigerant at the evaporator outlet must have 8 to 12°F (4 to 7°C) of superheat before more refrigerant is allowed to enter the evaporator. The adjusted tension of this spring is the determining factor in the opening and closing of the expansion valve.
This is where the expansion valve does its job: the valve is designed to remove pressure from the refrigerant and rapidly cool it down into a cold gas. The valve doesn’t remove heat, only pressure—but removing the pressure has the effect of lowering the temperature of the refrigerant.
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What the Expansion Valve Does. The expanding valve regulates the amount of chemical refrigerant that flows into the evaporator coil of your air conditioning system. The valve has a rod that moves up and down. When the rod is down, the refrigerant cannot flow into the coil. The movement of the rod meters the amount of refrigerant flowing through the coil. This affects how much heat it can absorb from your home’s air. How the Expansion Valve Helps Cool Your Home
The expansion valve regulates the amount of refrigerant funneled to the evaporator from the condenser and compressor. This part also depressurizes the refrigerant until it becomes cold enough to cool down the warm air passing through.
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A thermostatic expansion valve is known as the TX valve, TXV, or TEV. It is utilized in systems of high capacities, such as central air conditioners, packaged air conditioners, high-capacity air conditioning units, and industrial refrigeration units. Main Components of a TXV. A thermal expansion valve has a wide range of components.