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Bard 905-0487 is an OEM heating expansion valve assembly used in Bard wall-mounted HVAC heat pump applications to meter refrigerant during heating operation and maintain proper superheat at the indoor coil. When this valve is restricted, leaking, or out of calibration, you can see poor heating capacity, unstable pressures, coil frosting, or nuisance lockouts, so replacing it with the correct Bard factory part helps restore designed heating performance and reliability. Because expansion valves are system-specific by tonnage, refrigerant type, and tubing connections, confirm 905-0487 against your unit model and serial number or the Bard parts list before ordering, and have installation handled by a qualified technician with proper refrigerant recovery and evacuation procedures.