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Bard part 5651-046 is an OEM thermal expansion valve with 3/8 x 3/8 connections used in Bard wall-mount air conditioners and heat pump style equipment to meter refrigerant into the evaporator and maintain proper superheat under changing load conditions. When a TXV starts sticking, hunting, or loses charge, it can cause poor cooling, unstable suction pressure, coil frosting, or compressor stress, so replacing it with the correct Bard-specified valve helps restore designed capacity and reliable operation. Verify the unit model and refrigerant match before ordering, and have the system opened, evacuated, and recharged by a qualified HVAC technician following standard service practices.