1.Grooved pipe fitting connection technology, also known as grooved connection technology, has become the preferred technology for current liquid and gas pipeline connections. Although the development time of this technology in China is later than that in foreign countries, due to its advanced nature, it has been quickly recognized by the domestic market. Since its research and development began in 1998, after just a few years of development and application, it has gradually replaced the two traditional pipeline connection methods of flanging and welding. Not only is the technology more mature, but it is also widely recognized by the market and has received active guidance from national product regulations. 2.Grooved connection fittings include two major categories of products: ① fittings that play a connecting and sealing role, such as grooved couplings, mechanical tees, and grooved flanges; ② transition - function fittings, such as bends, tees, crosses, eccentric reducers, and caps. 3.The application of grooved pipe fitting connection technology simplifies complex pipeline connection procedures, making them simple, fast, and convenient, and has advanced pipeline connection technology by a large step.