An elbow is installed between two lengths of pipe (or tubing) to allow a change of direction, usually a 90° or 45°angle; 22.5° elbows are also available. The ends may be machined forbutt welding,threaded(usuallyfemale), or socketed. When the ends differ in size, it is known as a reducing (or reducer) elbow.
A 90º elbow, also known as a "90 bend", "90 ell" or "quarter bend", attaches readily to plastic, copper, cast iron, steel, and lead, and is attached to rubber with stainless-steelworm driveclamps. Other available materials include silicone, rubber compounds, galvanized steel, and nylon. It is primarily used to connect hoses to valves,water pumpsand deck drains. A 45° elbow, also known as a "45 bend" or "45 ell", is commonly used in water-supply facilities, food, chemical and electronic industrial pipeline networks, air-conditioning pipelines, agriculture and garden production, and solar-energy facility piping.
Elbows are also categorized by length. Theradius of curvatureof a long-radius (LR) elbow is 1.5 times the pipe diameter, but a short-radius (SR) elbow has a radius equal to the pipe diameter. Short elbows, widely available, are typically used in pressurized systems, and in physically tight locations.
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