1. Radius of curvature R = 15D (outer diameter)
90° elbow, 45° elbow, 60° elbow
Four types, reducing welding requirements, suitable for use on rigid pipes. These three flange elbows can also be considered as an assembly of two 45° elbows and a flat elbow. Therefore, this pipe section cannot be used as an elbow. Looking at the head, the outer arc is the outer arc of the elbow.
The outer arc includes: two inclined pipe sections and one straight pipe section. Elbows are divided into long radius elbows, short radius elbows, and medium radius large elbows.
2. Radius of curvature R = 1/2 (outer diameter)
Small radius elbows, long radius high-precision elbows, precision elbows, strong elbows, etc.
Small radius elbows include: equal diameter single bends, equal diameter tees, reducing diameter single bends, reducing diameter tees, where equal diameter tees can be medium diameter tees.
3. Radius of curvature R = pipe outer diameter.
Outward flare R = pipe outer diameter.
(a) Long radius: End face size > outer diameter, represented by RL, but in fact, there is no such elbow; it may be a blind flange or plug.
(2) Short radius: End face size = outer diameter. Frequently used in actual production. Represented by SR. There are various ways to produce SR90° elbows. There is also a high-precision, powerful precision elbow, which uses numbers to represent the bending angle and length in degrees. The length unit is millimeters/twice the number of equal-length pipes per meter. You can also fill in the parameters of alloy and annealed carbon rod flame polished accessories in detail in the product materials, etc. It mainly corresponds to the regularized model technology. And please indicate the specifications (diameter series DN8-DN80). The wall thickness is made of standard arc with opposite sides as the dividing line (other folds can also be provided), which is particularly suitable for pipes of DN8~DN600 and above. It is widely popular because it is cheaper than equal-diameter and reducing joints, has reliable connection, is easy to operate, and is safe and reliable. It has become one of the most ideal elbow products for metal pipe manufacturing, installation and maintenance departments. It features high-quality materials, low price, good mechanical properties, beautiful appearance, foldable welding and oxygen blowing welding technology, and complete range of diameters and wall thicknesses.
