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Bard part number 5651-235 is an OEM thermostatic expansion valve (TXV) with 3/8 inch by 3/8 inch connections, used in Bard wall mount and packaged HVAC equipment to meter refrigerant into the evaporator coil based on load conditions. A properly operating TXV helps maintain stable superheat, supports consistent cooling capacity, and protects the compressor from floodback caused by improper refrigerant feeding. When replacing a TXV, verify the exact Bard model and serial compatibility and follow standard refrigeration best practices for sealed system service, including proper brazing procedures, evacuation, and recharge to nameplate specifications.