A capillary tube is a thin copper tube used in cooling and refrigeration systems such as water coolers, refrigerators, and air conditioners. It plays a crucial role in controlling the flow of refrigerant within the system. The capillary tube connects the high-pressure side of the system to the low-pressure side and reduces the pressure of the refrigerant before it enters the evaporator. This pressure reduction allows the refrigerant to absorb heat efficiently, enabling the cooling process.

Capillary tubes are made from high-quality copper due to copper’s excellent thermal conductivity, corrosion resistance, and durability. The tube has a very small internal diameter and a specific length, which helps regulate refrigerant flow accurately without the use of mechanical valves or moving parts. Because of their simple construction, capillary tubes are reliable, cost-effective, and require minimal maintenance.

In water coolers, capillary tubes ensure stable cooling performance by maintaining proper refrigerant pressure and flow. Correct sizing and installation are essential, as an improperly selected capillary tube can result in poor cooling efficiency or compressor damage. Overall, copper capillary tubes are an essential component that ensures efficient, consistent, and long-lasting cooling system operation.