Elbow In the pipeline system, the elbow is a pipe fitting that changes the direction of the pipeline. According to the point of view, there are three most commonly used ones: 45° and 90°180°. Others include 60° and other abnormal viewpoint elbows according to engineering requirements.

The elbow materials are cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals and plastics. The methods of connecting with the pipe are: direct welding (the most commonly used method) flange connection, hot melt connection, electrofusion connection, thread connection and socket type connection, etc.

According to its radius of curvature: it can be divided into long radius elbow and short radius elbow. Long radius elbow refers to the outside diameter of the tube whose radius of curvature is equal to 1.5 times, that is, R=1. 5D. Short-radius elbow means that its radius of curvature is equal to the outer diameter of the pipe, that is, R=1.0D. (D is the diameter of the elbow, R is the radius of curvature).

According to the production process, it can be divided into: welding elbow, stamping elbow, push elbow, casting elbow number. Other titles: 90 degree elbow, right angle bend, love and bend, etc. Seamless elbow is a kind of pipe fittings used for pipe turning. Among all the pipe fittings used in the pipeline system, the largest share is about 80%. Generally, different forming processes are selected for elbows with different materials and wall thicknesses.

According to different shapes and uses, it can be divided into: groove elbow, ferrule elbow, double bearing elbow, flange elbow, reducing elbow, seat elbow, internal and external tooth elbow, stamping elbow, push System elbow, socket elbow, butt welding elbow, inner wire elbow, etc.

Currently. The commonly used seamless elbow forming processes in manufacturing plants include hot pushing, stamping, kneading and so on. Seamless elbows are also known as seamless steel pipe elbows. Due to their different manufacturing processes, seamless elbow fittings are divided into hot-rolled (kneaded) seamless elbow fittings and cold drawn (rolled) seamless elbow fittings. . Cold drawn (rolled) tubes are divided into two types: round tubes and special-shaped tubes.