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PTFE Expansion joints that can withstand various concentrations of acid, alkali, salt, and is not afraid of collision
Expansion joints(compensators)
Expansion joints, often termed compensators, feature one or more bellows as their core elastic component, along with connectors, supports, flanges, conduits, and ancillary accessories. These flexible structures find placement on vessel shells or pipelines to counteract additional stresses from temperature fluctuations and mechanical vibrations. Leveraging the bellows' expansion and contraction, they accommodate dimensional changes caused by thermal fluctuations, as well as axial, lateral, and angular displacements in pipelines, conduits, and vessels. Beyond compensation, they contribute to noise and vibration reduction in heating supply systems. Compensators play a vital role in preventing deformation or damage to heating pipelines due to thermal expansion, thereby alleviating stress on pipeline walls and minimizing forces on valves and support structures.
Elastic and versatile, expansion joints offer reliable operation, stellar performance, and compact designs, making them indispensable across chemical engineering, metallurgy, nuclear energy, and related fields. Vessel applications commonly feature U-shaped expansion joints, with Ω-shaped and C-shaped variants also prevalent. Pipeline expansion joints are categorized by structural compensation type, including universal, pressure balanced, hinged, and gimbal joints.
| 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
| A bellows expansion joint is an expansion joint made of metal bellows. It can expand and contract along the axial direction of the pipeline, and also allows a small amount of bending. In order to prevent exceeding the allowable compensation amount, protective rods or rings are installed at both ends of the bellows, and guide supports are installed on both ends of the connected pipelines. There are also angular and lateral expansion joints, which can be used to compensate for rotational deformations and lateral deformations of pipelines. The advantages of these expansion joints are space-saving, material-saving, easy standardization, and mass production, but the disadvantage is the relatively short lifespan. Bellows expansion joints are generally used in short pipelines with low temperature and pressure. With the improvement of bellows production technology, the application scope of this type of expansion joint is expanding. Currently, bellows expansion joints can be used in 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. Keeping both pipe ends aligned along the same axis is crucial during use. Comprising sleeves, shells, sealing materials, etc., it compensates for axial expansion and rotation at any angle. With a compact design and ample compensation capability, it suits hot water, steam, and grease media. By sliding the inner sleeve against the outer one, it accommodates thermal expansion. Equipped with a high-performance self-sealing dynamic seal, the inner sleeve seamlessly slides within the shell, meeting the sealing needs of any pipeline. Enhanced with synthetic materials, the seal withstands high temperatures, corrosion, and aging, with a broad temperature range from -40 to 150 degrees Celsius, extendable to 350 degrees Celsius in specific conditions. Ensuring axial sliding while preventing medium leakage, it offers comprehensive functionality for pipeline applications. | |
| 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 breakdown of various types of stainless steel 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
