The expansion joint is also called expansion joint, expansion joint, compensator and expansion joint. The telescopes are divided into steel telescopes, rubber telescopes and stainless steel telescopes according to their materials. The expander can expand axially in a certain range and overcome the offset caused by different axes of pipeline docking in a certain angle. It can greatly facilitate the installation and disassembly of valve pipeline. It can expand freely in the allowable expansion of pipeline. Once it exceeds its maximum expansion, it will play a limit to ensure the safe operation of pipeline. Mainly to ensure the safe operation of pipelines, it has the following functions: compensating the axial, lateral and angular thermal deformation of absorption pipelines; absorbing the vibration of equipment to reduce the impact of equipment vibration on pipelines; absorbing the deformation of pipelines caused by earthquake and subsidence. The expansion capacity of the expansion device is large, the temperature is high and the pressure area is strong. Foundation concrete pouring or pre-buried pipelines in building water supply and drainage engineering. In the process of settlement of building foundation, resonance of equipment, geological change and change of pipeline medium, the position of pipeline distribution begins to bear force, deform, distort and destroy pipelines, and pre-buried pipelines even break up, which brings great benefits to construction units. In order to overcome these difficulties and ensure the safe operation of the pipeline, the expander and expansion joint are used: it can expand axially in a certain range, and overcome all kinds of angle displacement, discentricity, expansion and expansion of the pipeline. Pipeline can expand freely in the expander. Once the maximum expansion is exceeded, it limits itself. So as to ensure the safe operation of pipelines Installation Notes: 1. Before installation, the type, specification and pipeline configuration of the expander should be checked. It must meet the design requirements. 2. For the telescopes with inner sleeves, attention should be paid to making the direction of inner sleeves consistent with the direction of medium flow, and the hinge rotation plane of the hinged telescopes should be consistent with the displacement rotation plane. 3. It is necessary to have a "cold-tight" expansion device. The auxiliary components used for pre-deformation should be removed after the installation of the pipeline. 4. It is strictly forbidden to use the method of deforming the extender to adjust the OVER-TOLERANCE of pipeline installation so as to avoid affecting the normal function of the extender, reducing its service life and increasing the load of piping system, equipment and supporting components. 5. During installation, no welding slag is allowed to splash onto the surface of the wave shell, and no other mechanical damage is allowed to the wave shell. 6. After the installation of the piping system, the Yellow auxiliary positioning components and fasteners used for installation and transportation on the wave expander should be removed as soon as possible, and the limit device should be adjusted to the prescribed position according to the design requirements, so that the piping system can be fully compensated under the environmental conditions. 7. All movable components of the telescopic device shall not be stuck by external components or restricted in their range of activity. Normal action of each movable part shall be guaranteed. 8. In hydraulic test, the secondary fixed pipe rack at the end of the pipeline with expansion device should be strengthened so that the pipeline does not move or rotate. For the expansion device used in gas medium and its connecting pipeline, attention should be paid to whether temporary bracket is needed when filling water. The 96 chloride ion content of water cleaning solution for hydraulic test is not more than 25 PPM. 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.