General Data
| Material: | Carbon steel or stainless steel |
| Bellows Material: | AISI 304ss, 316ss,321ss |
| Pressure: | 40 barG |
| Temperature: | 400ºC |
| DN: | 25-1000 |
| Flanged material: | Carbon steel, Stainless steel |
| Standard: | EN / ASME |
| Accessories: | Limit rods |
These type of expansion joints can be supplied with limit rod.
Externally pressurized DB expansion joints are an excellent solution for systems requiring large axial movements. In applications with significant expansion or contraction, additional bellows convolutions are needed to accommodate the movement. This can lead to concerns about "column squirm", where the bellows become unstable and may buckle under internal pressure. By applying pressure externally to the bellows, this risk is effectively eliminated.
These expansion joints are designed to be highly robust and reliable. They feature an integrated inner sleeve that ensures smooth flow and minimizes pressure losses, as well as an outer cover that protects the bellows during transport, installation, and operation. The protective outer cover also makes them suitable for underground installations.
Externally pressurized DB expansion joints are intended for axial movement only and are not suitable for lateral movement applications. They can be supplied with pipe ends or with welded or rotating flange connections manufactured according to international standards or customized drilling requirements.
Compared to traditional U-loops, these expansion joints offer significant advantages, including reduced pressure losses, lower installation costs, reduced space requirements, and simplified handling and maintenance.
Benefits / Properties
Steel expansion joints utilize one or more flexible elements to absorb movements in piping systems caused by thermal expansion and contraction. The flexible element consists of one or more stainless steel bellows, with the material grade and design selected to match the specific application and operating conditions.
KLINGER Denmark can supply expansion joints in a wide range of material grades, including AISI 304, 316, 321, 310S, 904L, Duplex 2205, Duplex 2207, and more. Solutions are available with control rods, reinforcements, internal liners, and pressure-balanced bellows designs. Our specialists can advise on the optimal expansion joint solution and provide comprehensive documentation for the supplied equipment.
KLINGER Denmark supplies steel expansion joints with fixed flanges, loose flanges, weld ends, or threaded connections. You can learn more about the available designs and solutions on this page.