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Bard part number 5651-107 is an OEM pressure differential valve used in Bard HVAC equipment to regulate and protect system operation by responding to a difference in pressure between two points in the circuit. When the pressure differential rises beyond the valve’s designed setting, it helps maintain stable performance and can prevent nuisance issues tied to improper pressure balance. This is a refrigerant and mechanical component, so correct application depends on matching the valve to your specific Bard model and configuration; verify the part number against your unit’s parts list or service literature before ordering to ensure proper fit and function.