How to see through or blindly see the drawings when installing a figure-eight blind plate?

1. Thickness of blind plate: the thickness of the figure-8 blind plate is slightly thicker than the wall thickness of ordinary pressure pipes. If the thickness marked on the drawing is greater than the pipe wall thickness, it is a blind plate.

2. Marking: If the mark on the figure-8 blind plate will be written as "M" or "B", where "M" means through-flow blind plate and "B" means fully closed blind plate.

3. Symmetry of blind plate: If the figure 8 blind plate is highly symmetrical on the drawing, it is a cross-flow blind plate; If the blind plate has no symmetry, it is a blind plate.

4. Whether there are connecting holes: if there are clips or connecting holes with screws on the 8-shaped blind plate, it is a cross-flow blind plate; If there is no such hole or clip, it is a blind plate.