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Bard 905-0545 is an OEM heating expansion valve assembly used in Bard wall mounted heat pump and air conditioning applications to meter refrigerant correctly during the heating mode circuit, helping the system maintain proper superheat, stable coil performance, and reliable heating output. Replacing a restricted, leaking, or out of calibration valve can resolve symptoms like poor heating capacity, abnormal pressures, and intermittent freeze up, and using the correct Bard factory part helps ensure the valve sizing, connection geometry, and control response match the original design for a straightforward service repair when verified against your unit model and serial number.