A compression fitting uses an external screw thread to compress the two ends together. Compression fittings are used for low-pressure applications, typically ranging from -5 to 125 psi. They are commonly used in refrigeration, air conditioning, and plumbing systems because they can be easily disassembled for maintenance or replacement if corrosion occurs. Unlike other types of joints, compression fittings do not need additional sealing materials like gaskets or o-rings because they seal through threads alone.
Compression fittings have two main components: the coupling nut and the compression ring. The coupling nut is threaded onto a pipe or tube to be joined with another pipe or tube at the desired angle, which is then tightened by hand. The compression ring is placed over the end of one pipe that has been inserted into the other end. It’s tightened until it reaches its maximum capacity without being able to tighten any further.
The materials used range from steel for iron pipes to brass-plated copper for plastic pipes. Depending on your needs, each material offers certain advantages, including corrosion resistance, durability, weight-bearing capability, ease of tightening/loosening, and more.
Compression fittings are often used in plumbing and mechanical systems. These fittings connect copper pipes with different shapes and materials, such as PVC or steel pipes. In addition, they can also be used for compression joints or couplings to join two lengths of pipe together. These types of pipes can be installed using a crescent wrench, which is helpful if you’re working in a tight space where other wrenches won’t fit.
However, compression fittings tend to leak more than hydraulic hoses and need to be replaced every 10 years on average, while hydraulic tubing can last up to 30 years.