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Bard part 5651-171 is an OEM expansion valve used in Bard wall mounted air conditioners and related packaged equipment to meter refrigerant into the evaporator and maintain stable superheat for proper cooling performance. When a valve sticks, hunts, or will not feed correctly, you can see symptoms like poor capacity, coil freeze ups, or erratic suction pressure, and replacing it with the correct Bard-specified valve helps restore designed system operation and protects the compressor. Match the part number exactly to your unit model and serial, and follow proper refrigeration practices for recovery, brazing, evacuation, and charging to Bard specifications.