What is a vacuum flange?

The vacuum flange is a small device used in the vacuum system, it looks like a ring when its circumference is larger than the actually connected pipe; there are small holes on the flange edge; the vacuum flange can be fixed, and can also be rotatable, fixed flanges usually have four to five holes, which can be inserted into the holes of the pipe or the opening of the chamber, while the rotatable flanges usually have more holes., Even if the plumber turns the flange in either direction, the holes can still line up with the holes in the pipe, and then fill the holes with screwed bolts to connect the flange to the pipe, so, it works for the pipe. Of course vacuum flanges can also be welded to the piping system to ensure that pressure does not escape the vacuum system through small holes.