Pressure Balanced Expansion Joints

This expansion joint is a unique design that not only restrains the pressure thrust, but also balances this thrust force so that main anchoring of the pipe and adjacent equipment is not necessary. The result is that the forces and moments on the nozzle connections of delicate equipment such as pumps and turbines are kept below the allowable loads. This expansion joint is used in cases where a Tied Expansion Joint is required to accept axial movement while restraining pressure thrust. The Pressure Balanced Expansion Joint can be designed as a single, or a universal if large amounts of lateral movement are required. The Pressure Balanced Expansion Joint is normally used at a change of direction in the piping, and the elbow is mounted between the line or flow bellows and the balancing bellows. The line bellows and balancing bellows have the same cross-sectional area and are connected by tie rods that restrain the pressure thrust. As the line bellows compresses, the tie rods force the balancing bellows to extend an equal amount and the elbow between the two is free to move axially with only the resistance of the spring rates of the bellows. The axial spring rate of the expansion joint is the sum of the spring rate of the line bellows and the balancing bellows. However, the lateral deflection and spring force of the expansion joint is only a function of the line bellows, whether it is a single or universal, and the balancing bellows is not subject to the lateral deflection.

EXTERNALLY PRESSURISED AXIAL BELLOWS

*For combination of High Pressure and Long Axial movements *Working pressure is transferred to the outside of the bellows.

Pressure balanced Expansion Joints
Pressure balanced Expansion Joints
Pressure balanced Expansion Joints
Pressure balanced Expansion Joints
Pressure balanced Expansion Joints
Pressure balanced Expansion Joints
Pressure balanced Expansion Joints