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Bard part number 5651-152 is an OEM 3/8 inch by 3/8 inch expansion valve used in Bard wall mounted air conditioners and related HVAC equipment to meter refrigerant into the evaporator and help maintain proper superheat across changing loads. When an expansion valve is restricted, sticking, or out of calibration, you can see symptoms like poor cooling, coil icing, and unstable suction pressure, and replacing it with the correct Bard valve is the safest way to restore factory refrigerant control and reliable operation. Verify the connection size and match the part number to your unit model and serial before ordering, since Bard may use similar valves across multiple platforms with different charge characteristics.