Expansion joints are customarily called expansion joints, or bellows compensators, which are used to use bellows compensators. The effective expansion and contraction of the elastic elements of the expansion joints absorb pipelines, ducts or containers caused by thermal expansion and contraction. A compensation device for dimensional changes belongs to a compensation element. It can absorb axial, lateral, and angular displacement, and is used to absorb vibration and reduce noise in heating displacement and mechanical displacement of pipelines, equipment and systems.  Classification and functions of expansion joints: metal expansion joints, non-metal expansion joints. ■ Non-metallic expansion joint A, non-metallic flexible compensator, expansion joint, which can compensate axial, lateral and angular directions, has the characteristics of no thrust, simplified bearing design, corrosion resistance, high temperature resistance, noise reduction and vibration reduction, etc., especially suitable In hot air ducts and soot ducts. B. Non-metallic flexible compensator Expansion jointCharacteristics 1. Compensation for thermal expansion, which can compensate for multiple directions, which is much better than a metal compensator that can only compensate for a single type. 2. Compensation for installation errors. Because of the inevitable system error during the pipeline connection process, the fiber compensator can better compensate the installation errors. 3. Noise reduction and vibration reduction: The fiber fabric and thermal insulation cotton body have the functions of sound absorption and vibration isolation, which can effectively reduce the noise and vibration of boilers, fans and other systems. 4. No reverse thrust: because the main material is fiber fabric, it is weakly transmitted. The use of fiber compensators can simplify the design, avoid the use of large supports, and save a lot of materials and labor. 5. Corrosion resistance: The selected fluoroplastics and organic silicon materials have good temperature resistance and corrosion resistance. Not resistant to high temperatures, worse than metal. 6. Light weight, simple structure, convenient installation and maintenance. 8. The price is lower than the metal compensator.■ Features and applications of metal corrugated compensator and expansion joint: A. Metal corrugated compensator is a device used to absorb dimensional changes caused by thermal expansion and contraction of pipelines, ducts, containers, and equipment. Its metal corrugation Pipe is the main compensation component, widely used in the soft connection of petrochemical, electric heating, boiler flue ducts, iron and steel metallurgy, cement, ships, machinery and other pipelines and equipment. Corrugated pipe, compensation element, material: stainless steel, carbon steel , Stainless steel lined with PTFE, etc. B. High temperature resistance and pressure resistance 1. According to the material, it is divided into metal expansion joints and non-metal expansion joints.     
■ Non-metallic expansion joint A, non-metallic flexible compensator, expansion joint, which can compensate axial, lateral and angular directions, has the characteristics of no thrust, simplified bearing design, corrosion resistance, high temperature resistance, noise reduction and vibration reduction, etc., especially suitable In hot air ducts and soot ducts. B. The characteristics of non-metallic flexible compensator (expansion joint): 1. Compensation for thermal expansion, which can compensate for multiple directions, which is much better than the metal compensator that can only be compensated in a single way. 2. Compensation for installation errors. Because of the inevitable system error during the pipeline connection process, the fiber compensator can better compensate the installation errors. 3. Noise reduction and vibration reduction: The fiber fabric and thermal insulation cotton body have sound absorption and vibration isolation transmission.The function can effectively reduce the noise and vibration of boilers, fans and other systems. 4. No reverse thrust: because the main material is fiber fabric, it is weakly transmitted. The use of fiber compensators can simplify the design, avoid the use of large supports, and save a lot of materials and labor. 5. Corrosion resistance: The selected fluoroplastics and organic silicon materials have good temperature resistance and corrosion resistance. Not resistant to high temperatures, worse than metal. 6. Light weight, simple structure, convenient installation and maintenance. 8. The price is lower than the metal compensator. ■ Features and applications of metal corrugated compensator and expansion joint: A. Metal corrugated compensator is a device used to absorb dimensional changes caused by thermal expansion and contraction of pipelines, ducts, containers, and equipment. Its metal corrugation Pipe is the main compensation component, widely used in the soft connection of petrochemical, electric heating, boiler flue ducts, iron and steel metallurgy, cement, ships, machinery and other pipelines and equipment. Corrugated pipe, compensation element, material: stainless steel, carbon steel , Stainless steel lined with PTFE, etc. B. High temperature and pressure compensator  [1] Introduction to the compensator The function and working principle of the compensator The bellows compensator is also called expansion joint and expansion joint. It is composed of accessories such as catheters. It is a kind of compensation device used to use the effective expansion and contraction of the elastic element of the bellows compensator to absorb the dimensional change of the pipeline, duct or container due to thermal expansion and contraction. It belongs to a kind of compensation element. It can absorb axial, lateral, and angular displacement. It is used for heating displacement, mechanical displacement of pipes, equipment and systems to absorb vibration, reduce noise, etc. It has a wide range of uses in modern industry.