Large flange standard in Europe and the United States

The DN1500 DN2000 Flange European standards in the Americas, but there is no standard, reflecting the maximum size of. hose adaptersAlthough the material is the same, but the standards are different, whether it is in the form of a bolt hole and the sealing surface and the theoretical weight is different. The European system 20593 and 20595 specifications are the same, but the rough 20601 standard is the same, because of what, what kind of support system, large flange blind flange.hydraulic adaptors