Bolt) can transmit the thrust of blind plate when starting the pump to all parts of the pump and pipeline, so as to prevent the thrust from concentrating on the pipeline or the near end of the pump to cause impact damage to the equipment. Because this series of products are metal products, which have high tensile and compressive strength, superior soft sealing performance, convenient loading and unloading and other functions, they are frequently used in power, metallurgical water supply and drainage, sewage treatment and other industries, mainly for the connection between pumps, valves and pipelines. They have a certain multi-directional displacement effect in pipeline operation, which can alleviate the thrust of blind plates in pipeline operation, It plays a certain role in protecting the pipeline, especially providing great convenience for the installation and maintenance of the pipeline.