Applied at change of direction and piping.
Typical arrangement of tie rod, balancing bellow sealed with bling flange and elbow keep the effective displacement of the assembly NILL by virtue of constant volume maintained during operation.
This expansion joint to restrain and balance the pressure thrust were the main anchoring of the pipe is not possible. But forces and movements required to keep low accepted level to attached load sensitive delicate equipment such as pump, rotating equipment, and turbine.
The line bellow is single or Universal, the balancing bellow is not subjected to lateral deflection.
This joint is used where at Tied Expansion Joint (Axial, Lateral) is required for axial displacement and to restrain pressure Thrust.