In Line Pressure Balanced Expansion Joint

The In-Line Pressure Balanced Expansion Joint is used in applications where pressure loading upon piping or equipment is considered excessive or objectionable. The major advantage of the In-Line Pressure Balanced design is its ability to absorb externally imposed axial movement without placing pressure loading on the system. The force resulting from the Bellows spring rate is not eliminated.  In fact, it is usually increased over that of a single Expansion Joints. Since both the flow Bellows and the balancing Bellows must be compressed or elongated, and the combined axial force acts upon the piping or equipment. Since the forces that move the Bellows are of a low order of magnitude. These are usually not objectionable, except in cases involving extremely light equipment with close clearance moving parts that might be affected by small forces.