The "8" type blind plate is named because it looks like an "8" type
blind plate. Used to isolate or connect piping systems. The
spectacle blind is a steel plate with fixed thickness divided into
two discs. Two discs are connected by flat steel, one of which is a
solid disc, the other is a hollow ring, and its inner diameter is
the same as that of the flange.The spectacle blind is a kind of
pipe part, which is mainly used to facilitate maintenance. For
specific shape, you can paint the upper part of "8" black. It is
half blind plate and half iron ring. It is commonly used for
pipeline flanges that need to change the process. The materials
mainly include carbon steel, stainless steel and alloy, which can
be selected according to the pipeline pressure grade and pipeline
medium.The spectacle blind is usually required to be isolated from
other facilities or devices in the pipeline system. Normally, the
spectacle blind is in the open position so that the fluid can pass
through the pipe. When the spectacle blind is in the closed
position, the pipe is closed and the fluid is blocked.The
maintenance of the piping system was one of the reasons why the
spectacle blind was rotated to the closed position. There is a
drill hole in the connecting web of the spectacle blind plate.
Loosen and disassemble some bolts. The spectacle blind plate can
rotate between flanges. After the gasket is replaced, the bolts can
be reassembled and fastened.Meaning:It is usually used on pipelines
with large pipe diameters. At ordinary times, one end of the flange
occupies the space to keep the pipeline unblocked. If necessary, it
is replaced with a blind plate with the same thickness at the other
end to cut off the pipeline. Avoid the forced expansion of
pipelines due to temporary replacement of other blind plates, which
will affect the whole system./* March 10, 2023 17:59:20
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