From the appearance of the blind plate, it is generally divided into a plate type blind plate, an 8-word blind plate, a plug-in plate, and a backing ring (the plug-in plate and the backing ring are blindly connected to each other).
The blind plate functions to isolate and cut off, and the function of the head, the cap and the welding plug is the same. Due to its good sealing performance, it is generally a reliable means of isolation for systems that require complete isolation. A flat plate blind is a solid circle with a handle for a system that is normally isolated. The 8-word blind plate is shaped like a figure 8, one end is a blind plate, and the other end is a throttle ring, but the diameter is the same as the pipe diameter of the pipe, and does not function as a throttle. The 8-word blind board is easy to use. When it needs to be isolated, the blind end is used. When the normal operation is required, the throttle ring end is used, and the installation gap of the blind plate on the pipeline can also be filled. Another feature is that the logo is obvious and easy to identify the installation status.
The blind flange is not galvanized when used in the oil medium system. It should be hot-dip galvanized for other media systems. The minimum zinc immersion layer weight is 610g/m2, and the hot dip zinc quality inspection is CB*/Z343.
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