The formal name of blind disk is flange cover, and some are also called blind flange or pipe plug. It is a flange without a hole in the middle, used to seal the pipe opening. The function is the same as that of the head and pipe cap, except that the blind seal is a removable sealing device, and the seal of the head is not intended to be opened again. There are many types of sealing surfaces, including flat surfaces, convex surfaces, concave and convex surfaces, tongue and groove surfaces and ring connection surfaces. Materials include carbon steel, stainless steel, alloy steel, copper, aluminum, PVC and PPR, etc.
A 10-thick blind plate is used for the pressure test of dn1200 ductile iron pipe.