What is the primary moisture removal device in refrigerant systems?

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Moisture removal from refrigerant systems is essential because water in the refrigerant can form acids, cause corrosion, and create ice that clogs metering devices. The device designed to continuously remove moisture and filter particulates from the refrigerant is the filter drier. It contains desiccant material that absorbs moisture as the refrigerant flows through, helping keep the liquid dry before it reaches the metering device and oil, which protects components like the compressor and valves from acid formation and freezing problems. The other components serve different roles: a pressure regulator controls pressure, an expansion valve meters refrigerant flow but does not remove moisture, and a Schrader valve provides a service port. So the filter drier is the primary moisture removal device.