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Flange Negative pressure resistant compensator Flexible Single Sphere Rubber Expansion Joint for pipeline piping
Expansion joints
Expansion joints, commonly known as compensators, are comprised of bellows, connectors, supports, flanges, conduits, and other components. Installed on vessel shells or pipelines, they mitigate additional stresses from temperature differences and mechanical vibrations. By harnessing the expansion and contraction of bellows, they accommodate dimensional changes and compensate for axial, lateral, and angular displacements. Additionally, they contribute to noise and vibration reduction and heating supply systems. Compensators are essential to prevent deformation or damage to heating pipelines due to thermal expansion, reducing stress on pipeline walls and support structures. Their elastic nature ensures reliable operation, high performance, and compactness, making them widely used in chemical engineering, metallurgy, nuclear energy, and related fields. Vessel expansion joints commonly adopt U-shaped, Ω-shaped, or C-shaped designs, while pipeline joints are classified into universal, pressure balanced, hinged, and gimbal types based on structural compensation.
| Main Item | Classification | Description |
| Metal Expansion Joint | ElbowExpansion Joint | Bend the pipe into a U-shaped or other shape, also known as tension bends,are a type of expansion joint that utilizes the elastic deformation ability of the form to compensate. Its advantages are good strength, long service life, and on-site production.The disadvantages are space-consuming, high steel consumption, and high friction resistance. This type of expansion joint is widely used in various steam piping and long pipes. |
Bellows Expansion Joint |
Material: Made of metal bellows. Functionality: Expands and contracts axially, allows minor bending. Safety Measures: Protective rods/rings at ends prevent exceeding compensation limits. Guide supports installed on connected pipeline ends. Variants: Angular and lateral joints compensate for rotational and lateral deformations. Advantages: Space-saving, material-efficient, easy standardization, suitable for mass production. Disadvantage: Relatively short lifespan. Common Applications: Typically used in short, low-temperature, low-pressure pipelines. Technology Advancement: Application scope expanding due to improved bellows production technology. Pressure Capacity: Suitable for pipe systems with a maximum pressure of 6.0 MPa. | |
| Slip-Type Expansion Joint | The slip-type expansion joint features inner and outer sleeves capable of axial movement, sealed with a stuffing box to maintain pipe alignment. Comprising sleeves, shells, and sealing materials, it compensates for axial expansion and rotation in pipelines at any angle. With a compact design and large compensation range, it's suitable for hot water, steam, and grease media. Sliding the sleeve against the outer one allows compensation for thermal expansion. The inner sleeve, connected to the pipeline, employs a high-performance self-sealing dynamic seal to meet sealing requirements. Enhanced with synthetic materials, the seal withstands high temperatures, corrosion, and aging, ensuring leakage prevention. It facilitates axial sliding and maintains seal integrity, even in extreme temperatures up to 350 degrees Celsius. | |
| Non-metallic Expansion Joint | Rubber Expansion Joint | Composed of rubber and rubber-fiber composite materials, steel flanges, sleeves, and insulation materials, it is mainly used for flexible connections between various fans and ducts. Its functions include shock absorption, noise reduction, sealing, medium resistance, easy displacement and installation. It is an ideal accessory for shock absorption, noise reduction, smoke and dust removal in the field of environmental protection. |
| Fabric Expansion Joint | The fabric expansion joint is mainly made of fiber fabric, rubber, and other high temperature resistant materials. It can compensate for the vibration and deformation of fans and ducts.Fabric expansion joints can compensate for axial, lateral, and angular products, with features such as no thrust, simplified support design, corrosion resistance, high temperature resistance, noise reduction, vibration reduction,and others.It is particularly suitable for hot blast pipes and smoke and dust pipeline of power plant.The non-metallic compensator's fiber fabric and insulation cotton itself have the functions of sound absorption and vibration isolation, therefore they can effectively reducing the noise and vibration of boiler, fan, and other systems. Simple structure, light weight, and easy maintenance. |
Here's a concise list of various stainless steels and alloys:
Super Austenitic Stainless Steel:
- 254SMO
- 904L
- AL6XN
Duplex Stainless Steel:
- 2205 Dual phase steel (S31803)
Nickel Based Alloy Steel:
- INCOLOY 800/800H/800HT/840/825
- INCONEL 600/601/690/625/X-750
Hastelloy Alloy:
- C-276
- C-22
- X
- MONEL 400/K500
Pure Nickel:
- N4
- N6 (Ni200, Ni201)
Titanium Plate For Stamping:
- GR1
- GR2
- TA1
- TA2
Austenitic Stainless Steel:
- SUS304
- SUS304L
- SUS316
- SUS316L
- SUS310S
- SUS321
- SUS316Ti
