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Bard part 5651-236 is an OEM thermal expansion valve with 3/8 inch by 3/8 inch connections used in Bard wall-mount HVAC equipment to meter refrigerant into the evaporator coil and maintain proper superheat under changing load conditions. Replacing a worn, stuck, or leaking expansion valve can help correct symptoms like coil icing, poor capacity, or unstable suction pressures, and using a genuine Bard valve helps ensure the correct capacity match and sensing response for your specific unit. For best results, confirm your unit model and serial number compatibility, follow proper brazing and evacuation practices, and replace the filter drier and weigh in the factory-specified refrigerant charge during service.