Many different applications that involve significant axial movements under extreme pressure use externally pressured expansion joints. They can absorb an almost limitless amount of movement. How does this work? The joint is arranged with the flow outside the expansion joint, with the internal part subjected to atmospheric pressure to eliminate pressure instability.

In applications where an internally pressured expansion joint would buckle, externally pressured expansion joints can absorb the compression. These joints allow greater axial flexibility, with the outside of the joint being placed under pressure and secured under a cover such as a duct or supply line.

Learn more about the advantages of externally pressured expansion joints by exploring relevant applications.

Advantages

Available in many different sizes and shapes, there are several benefits of using externally pressured expansion joints in many applications. These benefits include:

  • Require little to no maintenance
  • Customized sizing is possible
  • Compensates for thermal growth
  • Compact
  • Extremely durable and long-lasting

Applications

Many different industries utilize expansion bellows in their systems, including the oil, automotive, and aerospace industries. Here are typical applications of externally pressured expansion joints.

  • Return and Supply Lines — You’ll find return and supply lines in HVAC systems. A supply line pushes the hot or cold air from air conditioning or a furnace into a room, while a return line sucks in air to return into the ductwork.
  • Heating and Cooling Systems — This application refers to heat pumps, furnaces, radiant heating systems, boilers, and baseboard heaters.
  • Vertical Risers — This encompasses any system that reaches vertically through a building, such as pipes, ductwork, and conduits.
  • Steam Condensate Pump — Steam condensate helps to push water through a boiler system.
  • Water Supply Lines — This system provides both cold water and heat to homes and buildings

The advantages of externally pressured expansion joints span multiple industries and applications. Contact Triad Bellows to learn more about stainless steel bellows and expansion joints to improve and protect your industry applications.