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The Bard 905-0336 Expansion Valve Assembly is an OEM refrigerant metering component used in Bard wall-mounted air conditioners and heat pumps to regulate refrigerant flow into the evaporator, helping the system maintain proper superheat and stable cooling performance under changing loads. When a valve sticks, plugs, or loses control, symptoms often include poor cooling, frosting, and abnormal pressures, so replacing it with the correct Bard part is key to restoring factory operation. Because expansion valve assemblies are application-specific by model and refrigerant setup, confirm compatibility using the unit model and serial number before ordering to ensure proper fit and correct system performance after installation.