Is the blind flange fitted with a pair? Do I need gaskets in the middle?
The blind plate is used to block the flange plate, such as the disc inserted short tube, one end of the connecting mouth, one does not need, you can use the blind plate on the line, block the blind plate connection needs flange rubber pad and bolt
Yes, the purpose is to seal it.
It's a pair. Shim in the center. That's for sure. Gaskets are used for sealing. The type of gasket is different according to the medium, so the material is different. Cold water with rubber pad, hot water asbestos pad, or PTFE pad, metal pad and so on.
