The spectacle blind plate is named for its shape like an "8", which can be used to isolate or connect the pipeline system. 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 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.
The spectacle blind is a kind of pipe part, which is mainly used to facilitate maintenance. The black upper part of the "8" can be painted black to understand the specific shape. That is, half blind half ring. Commonly used for pipe flanges that need to be replaced. The raw materials are mainly carbon steel, stainless steel and alloy. It can be selected according to the pipeline pressure grade and pipeline medium.
The eight blind plates are composed of a solid circle and a hollow circle. When conveying fluid, the hollow circle is used. When eight blind plates are blocked, a solid circle is used. Better sealing performance. According to the actual production needs, where to use is actually for convenience. Otherwise, two plates should be prepared. Once another plate needs to be found there, the wrong diameter limit plate may be used.
Compared with the general blind plate, the spectacle blind plate does not need to be removed during the switching operation, and only needs to be replaced, which can avoid the gap between the blind pipe. In practical application, the spectacle blind plate is commonly used, and the matching flange sealing surface shall be used.
Q: How to determine the intermediate connection size of spectacle blind?
A: The thickness determines the diameter according to the pressure resistance grade. Generally, it is required to cover the entire sealing surface. If it is a plate flange, it can be used as long as it does not affect the bolt passing through (but it is not beautiful and is somewhat wasteful). The concave and convex flange is basically the same as the gasket.
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Post time: Dec-15-2022
