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The Bard 5651-082 is an OEM thermostatic expansion valve (TXV), identified by the SVE-4-N designation, used in Bard wall mount and packaged HVAC equipment to meter refrigerant into the evaporator and maintain proper superheat under changing load conditions. Replacing a restricted, leaking, or stuck TXV can help correct symptoms like poor cooling, coil icing, unstable suction pressure, or chronic floodback, and this Bard factory part is built to match the original fit and control characteristics required for reliable system performance. Because expansion valves are application specific, confirm the unit model and refrigerant match before ordering, and have installation performed by a qualified technician who can properly braze, evacuate, and recharge the system to specification.