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Lined flange cover (code BL (S))

The full name is “Lined Flange Cover,” designated as BL(S). It is a special type of blind flange (flange cover) that features an additional corrosion-resistant lining on the sealing surface side, used to seal pipelines while providing protection against media corrosion.
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8-character blind flange (code name BLF)

The full name is “8-shaped blind flange,” with the code BLF. It’s a special type of flange cover that resembles the shape of the number “8.” It consists of two parts: a “blind flange (sealing end)” and a “ring flange (flow-through end).”
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Raised Face (RF) Flange

The sealing type “Raised Face to Raised Face (RF-RF)” is one of the commonly used mating configurations for flange sealing surfaces, and it applies to plate-type flat-welded or butt-welded flanges.
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Full-Flange (FF) Flange

It adopts a full-flat (code-named FF) sealing surface design, with a mating configuration of full-flat-to-full-flat combination (i.e., FF—FF).
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