What are the two types of designs for expansion joints?

Expansion joints are critical components in various systems, particularly in piping and HVAC applications, as they absorb thermal expansion and contraction, vibrations, and misalignment. The two primary designs for expansion joints recognized in industry applications are bellows and slip joints.

Bellows are flexible elements often made from materials like stainless steel, designed to accommodate movement in multiple directions. They are particularly effective in handling pressure and providing a sealed environment, which is crucial for maintaining system efficiency and preventing leaks. Their construction allows them to expand and contract without compromising their integrity.

On the other hand, slip joints allow for axial movement but do not provide as much flexibility in other directions. They consist of two sections of pipe, one sliding inside the other, and are generally easier to install in certain configurations. Slip joints can also accommodate linear expansion but are not as effective as bellows in handling complex movements or high pressures.

The other options listed contain various types of joint designs that do not specifically categorize the two primary types suitable for expansion joints.