Blind board from the appearance, generally divided into plate plate blind board, figure 8 blind board, Insert Board, and the ring (insert board and ring for the blind) .
The Blind Board has the function of isolation and cutting off, which is the same as the head, pipe cap and welding plug. Because of its good sealing performance, for the need for complete isolation of the system, generally as a reliable means of isolation. A flat slab blind is a solid circle with a handle for systems that are normally isolated. The figure 8 blind, shaped like figure 8, one end is a blind, the other end is a choke ring, but the diameter of the same pipe diameter, does not play a choke role. 8-type blind board, easy to use, when need isolation, use blind board end, need normal operation, use throttle ring end, but also can be used to fill the blind board on the pipeline installation gap.
