盲目的

Blind flanges without holes in the middle for the use of sealed pipe plug. Sealing surface in the form of more types, with flat, convex, concave and convex face, tongue and groove face, ring joint face. Blind plate blocking the end of the pipe used, there are welding and blind flange (flange cover for the bolt connection), blind flange is a flange, and blind flange covers not only the form, there Welding blind, so blind to the folder. Blind is a blocked pipe, but not necessarily, but may be used in other places had changed the name, this time is similar to the line blocked, such as manhole covers, it is actually a flange covers But it has not blocked the pipe. And our Chazhong cover, etc. and the like. (Of course, "blind" to determine its role in the word "board" the word to determine its shape.)