Nordyne 664045R 0.045" Restrictor Orifice #45

The Nordyne 664045R 0.045 Restrictor Orifice is fixed metering equipment designed to control refrigerant flow within air conditioning and heat pump systems. It is fitted into the distributor assembly to maintain a consistent pressure drop, allowing the evaporator coil to receive a measured refrigerant supply for stable operation. HVAC systems use this component in residential split units and compatible coil setups where flow regulation is required instead of adjustable expansion equipment. In HVAC systems, it is positioned along the liquid line near the indoor coil to support balanced heat exchange and system output.