Pressure-balanced tees and elbows are used primarily to absorb axial displacements at a change in direction without any associated pressure thrust. Pressure-balanced tees can also be used in universal type configurations to absorb axial and lateral movement.
The example below shows the coding of a pressure-balanced tee in a turbine exhaust line. The bottom side of the tee is blanked off. The tee is a standard, unreinforced fabricated tee. The tie bars only act in tension.