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The Bard 800-0275 TXV Assembly is an OEM thermostatic expansion valve assembly used in Bard wall-mounted air conditioners to meter refrigerant into the evaporator based on load, helping maintain proper superheat and stable cooling performance. When a TXV starts sticking, hunting, or plugging, you can see symptoms like poor capacity, coil frosting, or unstable suction pressure, and replacing it with the correct Bard valve assembly is the best way to restore factory operation and protect the compressor. Because TXV fit and charge characteristics are model and refrigerant specific, confirm compatibility by matching the unit model and serial to the Bard parts list before ordering.