DN125 valve with DN125 flange, right?
Need sealing flange with sealant, you can try SL5051, high temperature resistance, oil resistance is very good
It must be true, but it also depends on the engineering pressure and the requirements of the sealing surface
This is of course, but there are nominal pressure, flange sealing surface forms (such as RF, flange and flange) and the standard of the flange should be consistent
