Expansion Joint Systems designs and manufactures a wide range of Single and Universal Rectangular Bellows Assemblies to compensate for axial and lateral movements over a broad cross section of operating conditions. Single and Universal Rectangular Bellows Assemblies are available in four different corner configurations and two basic span shapes. Size is governed only by transportation limitation. Oversized assemblies can be shipped in sections for field installation.

Rectangular bellows assemblies are used in gas turbine exhaust systems, turbine/condenser connections, boiler breaching, forced draft fans, flue gas ducts, regenerators, precipitators and other hot gas, large volume ducting systems.

It is very important when specifying lateral movement to indicate in which direction the movement is applied to the expansion joint. This is especially true on large rectangular ducts. The equivalent axial movement required when lateral movement is applied the "hard way" is much greater than when lateral movement is applied the "easy way". In many instances, a long Universal Expansion Joint Assembly is the only practical solution. Rectangular assemblies can be manufactured from a wide variety of materials, including Type 300 Series stainless steels, high nickel alloys and Cor-Ten steel.

Corner Configuration Types:

The application and operating conditions will dictate the correct choice of span shape and corner configuration. For low-pressure applications "V" span is used. For higher-pressure applications up to 30 psig, "U" span is preferred.

Single Mitre "V" span: This is the most common and economical type used to compensate for thermal expansion and can readily be bolted or welded into the connecting duct work. These are preferred in low cycle and vibration-free applications. Double Mitre "V" Span: This corner is slightly more expensive to manufacture than the single mitre design. However, they do provide a greater cycle life under the same set of operating conditions. Camera Corners "V" Span: These are used mainly on low-pressure applications. They have good cycle life characteristics and are less costly than the double mitre corner design. Rounded Corners "U" Span Should be considered in applications up to 30 psig, and where vibration and cycle life are important factors. Rounded corners are the most costly to manufacture.