A pipe elbow is one kind of pipe fittings which can change the liquid or gas flowing direction in a piping system. It is mainly used to connect two pipes,sometimes called a “quarter bend”. Elbows are split into three groups, which define the distance over which they change direction. Commonly, according to the distance of direction changing, the elbows are divided into the following three kinds: Short Radius Elbow （SR Elbow）, Long Radius Elbow （LR Elbow, Customized Radius Elbow.
Based on the angle change of the elbow direction, the elbows also are divided:90 degree elbow, 45 degree elbow,180 degree elbow(return elbow), Elbows in any degree.
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