The limit retractor adopts flange connection. This connection method is much more convenient than traditional welding, and it is also too convenient for future use and maintenance.
The method of using the double flange limit expansion joint is to connect one end of the expansion joint flange with the flange on the pipe or the flange of the valve fitting, and insert the pipe into the socket on the other end. The insertion length should be slightly less than the overall length of the product. The insertion end is pre-marked with a preparation length marker line for accurate grasping. Before installation, check whether the adjusting bolt is in the most slack state, and the rubber sealing ring in the sleeve should not be under pressure. When inserting the tube, apply soapy water to the tube in advance to reduce friction and facilitate insertion. After the pipe is inserted, the adjusting bolts should be tightened gradually and cyclically, so that the rubber sealing ring in the socket is tightly combined with the pipe.
For the double flange limit expansion joint of the inner sleeve, attention should be paid to whether the direction of the inner sleeve is consistent with the flow direction of the medium. Whether the hinge rotation plane is consistent with the displacement rotation plane of the main limit expansion joint, it is forbidden to use the deformation expansion joint. Adjusting the installation of the pipeline will affect the normal service life of the expansion joint and increase the burden on the pipeline. The ultimate expansion joint is mainly a compensating element, which utilizes the elastic element of the corrugated compensator to expand and contract effectively to absorb the dimensional changes of pipes, pipes, etc.
What is the reason for the damage of the limit expansion joint?
The use of the expander must first consider the applicable temperature of the conveying medium. Generally speaking, the temperature of the medium cannot be higher than 300 degrees. How acidic or alkaline the medium is, otherwise the expansion joint is easily damaged. In addition, during use, the expansion and contraction length of the expansion joint position is not enough, and the expansion and contraction length is forcibly exceeded, and the expansion of the contraction range may cause damage to the expansion joint.
In addition, the strength of the interface part of the limit expansion joint is not high enough. If the installation method is not accurate, the strength of the joint will be reduced, which may cause damage to the expander. When the expansion joint is installed in the open air, it should avoid sunlight exposure and contact with acidic and alkaline materials. Otherwise, the expansion joint will be damaged by corrosion for a long time.
The last point is also important. After the limit expansion joint is installed, if the deformation of the pipeline is serious, the displacement of the expansion joint exceeds its displacement range, which will cause damage to the expansion joint. To sum up, it is to analyze the cause of the expansion damage. If you understand the reasons for the damage of expansion joints, you must avoid these situations during construction and pipeline maintenance to ensure long-term stable operation of the pipeline.
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