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Contact SupplierA BEND is the generic term for what is called in piping as an "offset" - a change in direction of the piping. A bend is usually meant to mean nothing more than that there is a "bend" - a change in direction of the piping.
An elbow is a pipe fitting installed between two lengths of pipe or tubing to allow a change of direction, usually a 90° or 45° angle , though 22.5° elbows are also made. The ends may be machined for butt welding, threaded (usually female), or socketed, etc. When the two ends differ in size, the fitting is called a reducing elbow or reducer elbow.
Elbows are categorized based on various design features as below: