What device is used to intercept liquid refrigerant in the suction line to protect the compressor?

The device used to intercept liquid refrigerant in the suction line to protect the compressor is the suction line accumulator. Its primary function is to ensure that only vapor refrigerant enters the compressor, preventing potential damage that could be caused by liquid refrigerant returning to the compressor.

In air conditioning and refrigeration systems, it's crucial that the compressor operates with vapor rather than liquid. If liquid refrigerant enters the compressor, it can result in a condition known as "liquid slugging," which may cause severe mechanical failure. The suction line accumulator is specifically designed to hold any excess liquid refrigerant, allowing the compressor to pull in only vapor, thereby safeguarding its operation and longevity.

In contrast, other devices mentioned do not serve this same protective function. The thermostatic expansion valve (TXV) regulates the flow of refrigerant into the evaporator but does not intercept liquid refrigerant in the suction line. The condenser's role is to change refrigerant from a gas to a liquid, and the receiver drier stores and filters liquid refrigerant, but neither of these devices provide the specific protection against liquid refrigerant returning to the compressor as the suction line accumulator does.