Xin Hu pipeline
Elbow GB / t12459-2005 ASME b16.9-2003 din_-1-1991, etc
There are many flanges, commonly used JB / 81-94
HG 20592~HG20614 HG20615~HG20635等
Hg 20592 ~ hg20614 hg20615 ~ hg20635, etc
There are also many foreign flange standards
The elbow has 90 degrees and 45 degrees. The bending radius is standard. There are also long and short radius elbows.