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Bard part number 5651-041 is an OEM expansion valve used in the refrigeration circuit to meter refrigerant flow into the evaporator coil and help maintain correct superheat for stable cooling performance. A properly matched Bard valve is critical for preventing coil freeze ups, hunting, and poor capacity, especially after a sealed system repair or when replacing a failed valve that is sticking or restricted. Because fit and calibration vary by unit family and refrigerant application, confirm 5651-041 against your Bard model and serial number before ordering so the valve connections and rating match your equipment.