1.Concept:
      Elbow is a kind of connection fittings commonly used in plumbing installations. It is used to connect the bends of pipes to change the direction of the pipes.
2. Uses:
      A kind of connection fittings commonly used in pipeline installation, connecting two nominal pipes passing through the same or different pipes to make the pipe bend at a certain angle, the nominal pressure is 1-1.6Mpa
3. Classification:
      ① According to the angle, there are three most commonly used 45 ° and 90 ° 180 °. In addition, according to the needs of the project, it also includes other abnormal angle elbows such as 60 °.
      ② According to material, there are cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals and plastics.
      ③ According to the connection method with the pipe, direct welding (the most commonly used method) flange connection, thermal fusion connection, electric fusion connection, screw connection and socket connection, etc.
      ④ According to the production process, welding elbow, stamping elbow, push elbow, casting elbow, butt welding elbow, etc.
4. Factors affecting the price of elbows
      ① Caliber size
      ② wall thickness
      ③Material (stainless steel ＞ cast iron ＞ plastic)