Metal Bellow Expansion Joint

The core functions of Metal Bellows Expansion Joints are consistent with those of bellows in general, but with a greater emphasis on pipeline system compensation:

• Absorbing Thermal Movement: Compensates for the thermal expansion and contraction of pipelines caused by temperature changes. This is the most fundamental and critical function.
• Compensating for Installation Errors: Absorbs alignment deviations that occur during the installation of the pipeline system.
• Absorbing Vibration: Isolates and reduces the impact of mechanical vibrations from equipment (e.g., pumps, compressors, engines) and fluid pulsations on the pipeline system.
• Absorbing Foundation Settlement: Compensates for displacement caused by uneven foundation settlement in long-distance pipelines.

Based on the form of displacement they absorb, metal bellows expansion joints are primarily classified into the following categories:

• Function: Specifically designed to absorb compression or extension displacement along the pipeline's axis.
• Characteristics: Cannot absorb lateral displacement by itself. Requires pipeline guide supports to withstand the pressure thrust force.
• Application: Straight pipe sections, for compensating pure axial thermal expansion.

• Function: Primarily used to absorb lateral displacement (including angular displacement) perpendicular to the pipeline axis.
• Characteristics: Typically consists of two or more bellows connected by a central pipe. Offers large compensation capacity, suitable for complex movements in planar or three-dimensional piping systems.
• Application: Piping systems with bends, such as L-shaped or Z-shaped configurations.

• Function: Absorbs angular rotation of the pipeline within a single plane.
• Characteristics: Usually used with hinge rings, pin shafts, and other ancillary structures. Can only absorb angular displacement and cannot withstand pressure thrust.
• Application: Situations requiring precise control of movement direction.

• Function: Can simultaneously absorb any combination of axial, lateral, and angular displacements.
• Characteristics: Comprises a single bellows and two bellows connected to a center pipe. Offers very comprehensive compensation capabilities.
• Application: Where pipeline space is limited or displacement directions are complex.

• Function: Utilizes special hinge or tie-rod structures to balance the blind flange thrust generated by internal pressure, relieving the pipeline supports from bearing massive thrust loads.
• Characteristics: Often used at equipment interfaces, boiler inlets, and other locations where critical equipment needs protection.
• Application: Large-diameter, high-pressure pipeline systems where equipment interfaces cannot withstand significant thrust forces.

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