The high-pressure elbow is first fabricated by welding a polyhedral ring shell with a polygonal cross-section or a polygonal prismatic shell closed at both ends. After the interior is filled with a pressure medium, internal pressure is applied, and the cross-section is gradually changed from a polygon under internal pressure. Into a circle, it eventually becomes a circular ring shell. According to need, a circular ring shell can be cut into four 90 elbows or six 60 high pressure elbows or other specifications of high pressure elbow, the process is suitable for the manufacture of high pressure elbow It is an ideal method for manufacturing large-scale GB elbows at present.
The high pressure elbow is suitable for the pipeline system of petroleum, natural gas, chemical industry, hydropower, construction and boiler industries. No tube blanks are needed as raw materials, which can save the cost of equipment and molds, and can get any large diameter and relatively thick wall thickness. Thin national standard elbow. Due to the above two reasons, the manufacturing cycle can be shortened, and the production cost can be greatly reduced. Because no special equipment is required, it is especially suitable for processing large-scale GB elbows on site. The blank is a flat plate or developable surface, so the blanking is simple. , Accuracy is easy to ensure, assembly and welding are convenient