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The spiral wound gasket depends upon the mechanical characteristics of a formed metal spiral strip, rather than the compressive virtues of more traditional gasket materials. This makes it particularly suitable for low or fluctuating bolt loads. The sealing strips, or fillers, are usually graphite, although other materials such as Teflon® may be used, the windings are always s/steal. For this type of gasket to work the spiral must not be over compressed, hence one of two types of compression control is usually used.
The completed gasket is fitted into a steel ring of specific thickness. When the gasket is fitted into a flange and the bolt load is applied, flange closure is governed by the outer steel ring of the gasket. To further improve the pressure rating of the spiral wound gasket, a steel ring may be added to the inside. This also protects the windings (particularly the filler) , from contamination, or attack by the product.
The second usually compression control is not fitted to the gasket at all, but engineered into the flange. These Gaskets are called Unsupported Spiral Wound Gaskets.
METAL WINDING STRIP | FILLER MATERIALS | GUIDE RING MATERIALS |
Stainless Steel 316L Stainless Steel 304 Stainless Steel 309 Stainless Steel 310 Stainless Steel 316Ti Stainless Steel 321 Stainless Steel 347 Monel 400 Nickel 200 Inconel 600 Inronel 625 Inconel X750 Incoloy 800 Incoloy 825 Hastalloy B2 Hastalloy C276 Titanium | Treated Asbestos Fiber Non-Asbestos Fiber P.T.F.E Graphite Ceramic Aluminum | Carbon Steel Stainless Steel 304 Stainless Steel 316L Stainless Steel 316Ti Stainless Steel 321 Stainless Steel 347 Stainless Steel 4l0 Monel 400 Nickel 200 Inconel 600 Incoloy 800 Inroloy 825 Hastalloy B2 Hastalloy C276 Titanium Alloy 20 |
Style | Construction | Flange | Hoop material | Filler Material | Inner & Outer Material | Size (mm) | Thickness(mm) | |
v | w | |||||||
1 | Basic type | Tongue and Groove | Ocr13 304 304L 316 316L 321 TI Mon400 Inconel Etc. | Graphite PTFE Asbestos Non-asbestos Ceramics | Carbon steel 304 321 304L 316 316L T1~T3 Monel Incoloy 600-800 Hastelloy C276\C4 | 10-3000 | 3.2 4.5 | 4.8 5.5 7.5 8.5 9.6 Ect. |
2 | With outer ring | Raised face and Flat face | ||||||
3 | With inner ring | Male and Female | ||||||
4 | With inner and outer ring | Raised face and Flat face | ||||||
5 | For heat exchanger | Heat exchanger | ||||||
6 | Special Oval SWG | Special | ||||||
ss316L spiral wound gasket