The expansion joint is composed of four major parts: the pipe body, the pressure ring, the seal ring and the bolt. The pipe body and the pressure ring form the main structure of the product, while the rubber seal ring in the middle makes them have a sealing performance, so that the medium can flow freely in the expansion joint, and then the bolt can be fastened. The expansion joint can be axially expanded within a certain range, and can also overcome the offset of the pipeline docking within a certain angle, which can greatly facilitate the installation and dismantling of the valve pipeline, and can be freely expanded and contracted in the allowable expansion amount of the pipeline, and once the expansion amount is exceeded, it can play a limit to ensure the operation of the pipeline. It can transfer the pressure thrust of the connected parts and compensate the pipeline error, but cannot absorb the axial displacement. It is important for the loose connection of pump, valve, pipeline and other accessories. After installation and welding, the gland bolts are tightened diagonally and evenly so that it becomes a whole and has a certain displacement, which can transfer the axial thrust to the whole pipeline when it is working.
Force transfer expansion joint is to fix two pipes, pipe fittings or equipment, each on a flange first, and between the two flanges, add flange gasket and fasten together with bolts to complete the connection. Force transfer expansion joint is divided into threaded connection flange and welding flange. There are threaded connection flanges for small diameters of low pressure, and welded flanges are used for large diameters of high pressure and low pressure. The thickness of flanges and the diameter and number of connection bolts are different for different pressures. Internal structure can be seen in the fragile part may be the rubber seal, rubber seal overall all made of rubber, so it is very soft, and make very easy to damage, so the maintenance plant in the rubber seal to regularly check to see if there are cracks and other aging phenomenon, such as the discovery of timely replacement to prevent leakage during use. In the installation process should also avoid the collision of sharp objects, rubber encountered sharp objects is also very fragile, so special attention should also be paid.
