Flange joint is a kind of component that is very common and widely used in engineering design. It is an indispensable part of piping design and pipe valve, and it is also a necessary component in equipment and equipment parts (such as manholes, sight glass level meters, etc.). In addition, other professions such as industrial furnace, thermal engineering, water supply and drainage, heating ventilation, self-control, etc., often use flange joints.
There are GB series (national standard), JB series (Ministry of Machinery), HG series (Ministry of Chemical Industry), ASME B16.5 (American Standard), BS4504 (English Standard), DIN (German Standard), JIS (Japanese Standard).
Flange standard system:
The flange standard mainly has two systems, namely the European pipe flange system represented by German DIN (including the former Soviet Union) and the American pipe flange system represented by American ANSI pipe flange.