Elbow (English name: elbow), also known as a 90-degree elbow or right-angle bend, is a type of pipe fitting used to change the direction of a pipeline in a piping system. It is mainly used in water supply and drainage installation fields. According to the angle, this type of fitting can be divided into three common types: 45°, 90°, and 180°. In addition, there are some non-standard angles, such as 60°, to meet special engineering requirements. An elbow is defined as a fitting with a bend radius less than or equal to 1.5 times the pipe diameter.
Elbow materials include cast iron, malleable cast iron, stainless steel, alloy steel, carbon steel, non-ferrous metals, and plastics. Connection methods include direct welding, flange connection, heat fusion, electrofusion, threaded connection, and socket connection. According to the manufacturing process, elbows can be divided into welded elbows, stamped elbows, hot pressed elbows, and cast elbows. The main standard is GB/T12459-2017 "Steel Buttwelding Pipe Fittings." The main manufacturing processes include hot press forming, stamping, and medium plate welding. Hot press forming has the characteristics of uniform wall thickness and continuous operation, and has become the main production method for carbon steel elbows. The products require surface shot blasting and anti-corrosion coating treatment. Export packaging requires individually packaging large single products and affixing a size and parameter label.
This type of fitting is widely used in engineering fields such as chemical, construction, petroleum, power, and shipbuilding. In piping systems, it functions to change direction and connect pipes of different diameters. It is also known in industrial terms as a butt-weld elbow.
Elbows are commonly used pipe fittings in pipeline installations, used to connect pipes at bends to change the direction of the pipeline.
Other names: 90° elbow, right-angle elbow, bent pipe, stamped elbow, pressed elbow, machined elbow, welded elbow, etc.
Application: Connect two pipes of the same or different nominal diameters, allowing the pipeline to bend 90°, 45°, 180°, and other angles.
A bent section with a radius less than or equal to 1.5 times the pipe diameter is called an elbow, while a bent section with a radius greater than 1.5 times the pipe diameter is called a bend.
