The expansion joint is also called the pipeline expansion joint, compensator and expansion joint. Because the pipeline expands and contracts, it is necessary for the pipeline to produce the stress and push-pull force of the pipe wall; the stress of the pipe wall affects the strength of the pipeline, and the push-pull force increases, so the fixed support of the pipeline has to do a lot to bear the push-pull force produced by the pipeline expansion; so the variable-opening method of compensation by the expansion joint is used. To reduce wall stress and thrust. The expansion joint is mainly used to compensate the expansion deformation caused by the temperature change of the pipeline, and also to compensate the length of the pipeline required by installation and adjustment. The expansion joint is mainly divided into several types: corrugated expansion joint, casing expansion joint, square natural compensation expansion joint and so on. Among them, corrugated expansion joint is more common, but today we are the main type. Let's talk about the casing expansion joint. The expansion joint of the casing can be axially expanded in a certain range, or can overcome the inexpensiveness of the pipeline due to the different axes of the docking in a certain angle. It can greatly facilitate the installation and disassembly of the valve pipeline. It can be freely expanded in the allowable expansion of the pipeline. Once it exceeds its maximum expansion, it will start. To limit the role of ensuring the safe operation of pipelines. Detailed description of casing expansion joint: 1. Casing expansion joint This product provides great convenience for installation and replacement of various water supply and drainage pipes, water towers, pumps, water meters and valves, and plays a very good regulating role for long-distance pipelines due to temperature difference expansion. 2. Casing expansion joint The inner pipe of this product is divided into three kinds: cast iron, galvanized and steel, working pressure PN6, PN10, PN16. 3. Before installing the expansion joint of the casing, loosen the pressure plate bolt, pull the product to the installation length, and then tighten it diagonally. Do not flatten it. If it is used overhead, the corresponding fixing brackets should be installed at both ends. 4. Flange connection adopts GB4216.3-4126.5 standard. 5. If other specifications are selected, they can be produced separately. Then tighten with diagonal method, do not bias, such as overhead use, both ends must be installed with the corresponding fixing bracket. Flange connection adopts GB4216.3-4126.5 standard. Over the past few years, our Gongyi Hongsheng Pipeline Equipment Co., Ltd. has continuously developed new products, improved product quality, done a lot of research and experiments, put forward a new product structure, greatly improved the performance of the products, and won the praise of the vast number of users. If special specifications of products are needed, they can be designed and manufactured according to user's requirements. And sincerely hope that new and old customers, design units recommend the use of our company's products.