How to represent elbows with symbols

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Many netizens are not very clear about how elbows are represented symbolically; sometimes, even when they see the symbols for elbows, they don’t understand what they mean. Next, I will explain the elbow representation system. What does the elbow symbol used for pipe fitting identification mean? How to represent the corresponding pipe fittings using symbols. For those working in the piping industry, pipe fitting identification is the most fundamental knowledge. A detailed explanation is provided on how elbows are labeled and what the various symbols mean, addressing the issues mentioned above. It provides a simple and clear explanation of only the necessary parameters for elbows, making things easier to understand. I. The so-called pipe fitting identification refers to the fact that, for a particular type of pipe fitting, it is necessary to know which parameters are required to uniquely determine the characteristics of that pipe fitting. Generally speaking. The following parameters must be known: ⑴ Category (for elbows, the angle and bending radius are also required) ； For different pipe sizes, it is also necessary to know whether they are concentric or eccentric. ⑵ Material. ⑶ Pipe diameter and standard (when expressed in nominal diameter, it is essential to confirm whether it is metric or imperial). ⑷ Wall thickness or pipe grade. ⑸Standard number (sometimes an A or B is added after the standard number to indicate whether the system uses imperial or metric units). I will use GB12459 \"Steel Butt-Welded Seamless Fittings\" as an example. For instance: 45° elbow, R=1.5D, 20#, DN250, SCH20, GB12459B. The meanings are as follows: 45° elbow – the angle of the elbow; R=1.5D – the bending radius of the elbow; 20# – the material of the elbow; DN250 – the diameter of the elbow; SCH20 – the wall thickness class of the elbow; GB12459B – the standard applicable to this elbow