What is a flange gasket?

What is a flange gasket?
Flange gaskets are designed to seal the space between two sections of pipe. Most pipes, of course, are joined at a flanged surface. The surface where two pipes join isn’t smooth or otherwise flat. Rather, it’s flanged, meaning it flares out. For flanged surfaces such as this, flange gaskets are used.Get more news about Flange Metallic Gasket,you can vist our website!

How Flange Gaskets Work
Flange gaskets work in the same way as most other gaskets. When installed, they create a sealed mating surface so that water or other liquids won’t leak out. Pipes typically have water or liquids flowing through them. If two pipes are joined together, the water or liquids may leak out through this mating surface. Flange gaskets prevent this from happening by sealing the surface.

Pipes generally don’t offer a sealed mating surface when used alone. This is especially true in the case of pipes with a flanged surface. Since flanged surfaces are flared, water and liquids can easily escape through the cracks. A simple solution to prevent leaks is to install a flanged gasket. The flanked gasket will contour to the shape of the pipes’ flanged surface so that water or liquids stay within the pipes.

Types of Gaskets
Non-Metallic Flange Gaskets (Rubber Flange Gasket)
These are usually composite sheet materials are used with flat-face and raised-face flanges in low Pressure Class applications. Non-metallic gaskets are manufactured from arimid fiber, glass fiber, elastomer, Teflon® (PTFE), graphite etc.. Full-face gasket types are suitable for use with flat-face flanges. Flat-ring gasket types are suitable for use with raised face flanges.

Introduction of PTFE gasket
Polytetrafluoroethylene (PTFE) packing gasket is a kind of non-metallic composite cushion, which is generally composed of two parts: the cover and the insert. The main function of the envelope is anti-corrosion, which is usually made of polytetrafluoroethylene. The insert (filler) is a non-metallic material with or without metal reinforcement, which is usually made of asbestos rubber sheet.

Polytetrafluoroethylene (PTFE) packing gasket is mainly suitable for full plane and raised face steel pipe flange connection. It is suitable for corrosive medium with nominal pressure PN of 0.6 ~ 5.0mpa and working temperature of 0 ~ 150 ℃ or medium with high cleanliness requirements.
Polytetrafluoroethylene (PTFE) gasket for pipe flange can be divided into three types according to manufacturing methods: cutting type (s type), machining type (M type) and folding type (F type).

For the machined packing gasket, the inner diameter of the packing layer can be consistent with the inner diameter of the flange, so as to prevent the eddy current of the fluid at the flange. As for the folded packing gasket, it is made of 0.4-0.8 mm thick polytetrafluoroethylene (PTFE) film. After heat sealing, both ends of the gasket are wrapped outside the annular core material in U shape. It is easy to manufacture and suitable for large flange sealing.