Thorburn’s 42 IRPB has a balancing bellows (EJBB) with an effective area twice as large as the line bellows (EJLB). The inter-linking arrangement of the tie rods transfers and balances the pressure thrust loads.

As the line bellows are compressed, the balancing bellows are extended an equal amount without volume change. Removing volume changes means the pressure thrust forces have been neutralized. Therefore; the only loads acting on the piping system are the sum of the forces needed to compress or extend the expansion joint.

Thorburn’s 42 IRPB is an alternative to metallic in-line pressure balanced bellows expansion joints, which are susceptible to failures from corrosive media, cyclic loading conditions and solids from settling into the thin walled metallic convolutions.

• Eliminates pressure thrust loads

• Pressures up to 150 psig

• Absorbs axial movement

• Replaces pipe loops

• Super corrosion resistance

• Wetted metallic components can be added