Telescopic joints and rubber joints are now widely used in the field of pipe fittings. Telescopic joints are new products connecting the pumps, valves, pipes and other equipments with the pipe, which are connected by bolts to make them form a whole and have a certain amount of displacement. In this way, the displacement compensation for the axial displacement caused by thermal stress or other stresses can be carried out. The rubber joint is mainly used the connection of the unfixed pipe because of its strong flexibility, which can reduce the vibration and resist dryness in the operation of the pipeline. And then depending on the use of the environment, the formula of rubber can be changed to resist high temperature, acid and alkali resistance, corrosion resistance, wear resistance and other characteristics. This is something that some steel does not have, so rubber joints are widely used in many fields.
The telescopic joint and the rubber joint are both pipe joint connection accessories and also have a certain compensatory scalability. However, there is still a great difference between the rubber joints below in the specific application. The change of elongation and compression of rubber joint under DN150 increases with the increase of nominal diameter of the product, and the increase of compensation is also obvious. However, after the DN200, its displacement changes are relatively small. But the expansion joint is not the same. The axial compensation of the expansion joint changes with the nominal diameter of the expansion joint. In each small range, the elongation and compression of the expansion joint are basically the same, but the overall trend is steadily increasing. When this happens, it is necessary to be analyzed in terms of the working principle of the rubber joint. The expansion of the rubber joint depends on the elasticity of the rubber material. Although the rubber elasticity is good, it also has certain limits. But the telescopic joint is different. The telescopic joint is compensated by the relative displacement of the body and the telescopic tube. The existence of a certain gap in the middle is helpful to the normal operation of the movable parts, and the sealing gasket is used in the middle to ensure the waterproof performance of the telescopic joint.
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