A corrugated compensator, also known as an expansion joint, is a device used to absorb dimensional changes or displacements of pipes, conduits, or vessels due to thermal expansion and contraction, mechanical displacement, or vibration. Its core part is the bellows, while the complete corrugated compensator structure includes the following main components:
Bellows：
The bellows is the core of the compensator and is made of one or more layers of sheet metal that form a series of alternating raised and recessed corrugations. The elasticity of the bellows allows it to expand, contract, or bend in axial, transverse, or angular directions to absorb displacement from the piping system.
End Fittings：
End tubes are connectors at both ends of the bellows and are used to connect the compensator to other components in the piping system (e.g. flanges, pipe fittings). The design and material of the end pipe should be matched with the bellows to ensure the overall sealing and pressure resistance.
Flanges：
The flange is used to bolt the corrugated compensator to the piping system. The flanges can be flat welded flanges, butt welded flanges, or sliding flanges, etc. The specific type depends on the requirements of the piping system.
Guides：
The conduits are auxiliary structures that guide the direction of movement of the bellows, preventing excessive lateral offset or twisting during compensation.
Brackets：
The brackets are used to support the corrugated compensator, ensuring its stability in the pipeline system while allowing the necessary displacement without compromising structural integrity.
reinforcing ring (Stiffening Rings)：
Reinforcement rings are located inside or outside the bellows and are used to enhance the structural strength of the bellows, improve its pressure bearing capacity, and control the uniform deformation of the corrugations.
Balancing Bellows：
One or more balanced bellows are included in some designs to offset the pressure thrust of the working bellows during the compensation process, achieving pressure balance.
tie rod screw (Tie Rods)：
The tie rod screws are used to maintain the shape of the bellows during transportation and installation, preventing it from moving freely in an uncontrolled state, causing damage.
Gaskets：
A filler or gasket is used to provide a seal at the flanged connection to prevent media leakage.
Sleeves：
For bellows exterior, providing additional guidance and protection.
Corrugated compensators are available in a variety of types, including axial, transverse, angular, pressure balanced, and more, and the design and structural details of each type will vary to meet specific application needs. When selecting and designing a corrugated compensator, it is necessary to consider the operating conditions of the pipeline system, such as temperature, pressure, media characteristics, type and amount of displacement, and other factors.