What is a common use of soft-solder fittings in refrigeration systems?

Soft-solder fittings are commonly used for tubing connections in refrigeration systems due to their ability to create strong, leak-proof joints at relatively low temperatures. These fittings allow for easy assembly and disassembly of the components involved in the refrigeration cycle.

Using soft-solder allows technicians to work without the need for high temperatures, which could damage sensitive components or insulation in refrigeration systems. It is particularly beneficial in applications where precise fit and flexibility are essential, such as when connecting copper tubing, which is a prevalent material in refrigeration systems.

The other options may not align with the primary function of soft-solder fittings as effectively as tubing connections. High-pressure connections typically require more robust methods such as brazing or welding to withstand the stresses involved. Low-temperature joints are not a specific use case for soft solder, as its strength and suitability are more about the application in assembling connections rather than being limited by temperature. Valve fixtures generally require stronger methods to ensure proper sealing and durability under varying operational conditions.