What type of expansion joint does not utilize mechanical movement?

The type of expansion joint that does not utilize mechanical movement is the fabricated expansion loop. This type of expansion joint works by physically altering the piping layout to allow for thermal expansion without requiring moving parts or mechanical mechanisms. The loop is designed to absorb movement through the shape and bends in the piping, thereby maintaining system integrity and preventing stress on the piping materials.

In contrast, other types of joints like the ball joint, bellows joint, and packed joint do incorporate some form of mechanical movement to accommodate thermal expansion or other mechanical stresses. Ball joints allow for angular movement, bellows joints provide flexible movement through their accordion-like structure, and packed joints use seals to accommodate movement while preventing leaks. Hence, the fabricated expansion loop stands out as the option that operates without mechanical movement.