In a piping system, an elbow is a pipe fitting that changes the direction of the pipe.  According to the Angle, there are 45° and 90°180° three most commonly used, in addition according to the needs of the project also includes 60° and other abnormal Angle elbow.  Elbow materials include cast iron, stainless steel, alloy steel, malleable iron, carbon steel, non-ferrous metals and plastics.  

     The ways to connect the pipe are: direct welding (the most common way) flange connection, hot melt connection, electric melt connection, threaded connection and socket connection.  According to the production process can be divided into: welding elbow, stamping elbow, push elbow, casting elbow, butt welding elbow and so on.  Other names :90 degree bend, right Angle bend, etc.