Basic Definition and Core Classification of Pipe Fittings
Apr 13,2026
Pipe fittings are key components in piping systems used for connection, direction change, flow distribution, diameter reduction, sealing and support, known as the "joints" of piping systems. They directly affect the stability and safety of pipeline network operation. By function, they can be divided into connection fittings (flanges, unions), direction fittings (elbows, bends), distribution fittings (tees, crosses), reduction fittings (reducers), sealing fittings (caps, plugs), support fittings (hangers, supports), etc. By connection method, they include welded fittings, threaded fittings, flanged fittings, socket fittings, clamp fittings, etc. By material, they are classified into metal fittings (carbon steel, stainless steel, alloy steel, copper alloy) and non-metallic fittings (PVC, PE, PPR, fiberglass), etc. Different types adapt to various pressure, temperature, medium and working conditions.
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