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Bard part 5651-217 is an OEM thermal expansion valve with 3/8 inch by 3/8 inch connections, used to meter refrigerant into the evaporator coil so the system maintains stable superheat and consistent cooling. When a TXV sticks, plugs, or loses its charge, common symptoms include poor capacity, hunting, coil frosting, or abnormally high or low suction pressure. Replacing 5651-217 with the correct Bard OEM valve helps restore proper refrigerant control and protects the compressor by keeping evaporator feed rates within Bard design specifications. Confirm compatibility by matching the part number to your unit model and serial data before ordering, since TXVs are application specific by tonnage and refrigerant.