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Introduction and classification of pipe fittings
Jul 20, 2017

Pipe joint is a common part in the pipeline, it plays the role of connecting the pipe, changing the direction, taking out the pipe and so on. When the pipe joint is threaded, the specification dimension of the threaded pipe joint is nominal with the outer diameter of the steel pipe. Because the connection of the pipe joint is the base of the outside diameter, the outer diameter of the steel tube and the pipe joint are the same in all kinds of pressure, and the wall thickness and inner diameter are different, and the wall thickness is thinner and the inner diameter is larger when the pressure is high, the wall thickness is thicker and the Under the same flow rate, the flow rate is slightly higher than that of low pressure. Although the pressure loss in the tube increases slightly during high pressure, the relative value of the pressure loss (△p/p) does not increase, and most of the time it is reduced. Therefore, the outside diameter is the benchmark and nominal fitting.

Beyond the diameter of the benchmark, not only to reduce the number of external diameter of seamless steel tubes, but also to reduce the number of thread joint specifications, and facilitate the low, medium and high pressure threaded pipe joints of the general, in the production of a huge economic significance. On the other hand, if the internal diameter as the benchmark, then the pipe outside the pressure and the size of the number of types of fittings increase, low, medium and high-pressure threaded pipe joints are difficult to swap, not conducive to the organization of specialized production.

Pipe joints are divided into card-sleeve pipe joints, flared-type pipe joints, welded pipe joints and other pipe joints four categories, commonly used in different types of pipe joints have been standardized, general-purpose pipe joints formulated as national standards or machinery industry standards, special fittings for the industry standards.

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