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The figure-eight blind flange lives up to its name: a solid disc and an annular ring are joined by a short stub flange. When bolted between two flanges and then rotated 180°, the pipeline is either fully open or completely sealed. There’s no need for a valve seat that could leak, nor for monthly gasket replacements—just a single forged component that can remain in the piping system for a lifetime.
A loose flange is a type of flange that is slip-on and movable at the pipe end (a loose-type flange). It achieves rotational flexibility and easy alignment through flanging or the use of a steel ring, and is commonly used in piping applications involving corrosive media, low pressure (typically ≤1.6 MPa), and frequent disassembly.
A plate flange (PL flange or flat flange) is a flat, circular forged component featuring a central bore and a ring of bolt holes. It can be simply slipped over the pipe and welded on both sides to achieve a secure seal—no raised face or neck is required; only a single flat flange is needed, making installation straightforward and cost-effective. Note: Plate flanges are perforated and used for connecting pipelines; blind flanges (BL) are solid and serve to shut off fluid flow. Use a PL flange when connection is required, and a BL flange when isolation is needed.
Threaded flanges (threaded flanges, Th flanges) feature female NPT threads in their bore. Simply screw the pipe into the flange, install a gasket, and tighten with bolts to achieve a leak-tight seal—no welding or hot work is required, making them particularly suitable for small-diameter piping or hazardous plant areas. As this connection method is mechanical, threaded flanges are the preferred choice for explosive atmospheres, cryogenic discharge lines, and any application where sparks could lead to severe consequences.
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