SpiralWound Gaskets are produced with an alternating combination of formed metal wire and soft filler that are tightly and spirally wound together. When compressed between two flanges they form a seal. There is a V-shaped crown in the center of the metal strip that acts as a spring, giving gaskets greater resistance under varying conditions. Filler and wire material can be selected to accommodate the application.
The metal winding around the entire inside and outside circumferences of the gasket is spot welded. The inside and outside diameters are reinforced with several plies of the metal winding without a filler being introduced.
Based on the application, the gasket is provided with an outer ring, an inner ring or both outer and inner rings. The outer ring acts as a compression stop, anti-blowout device, which centers the gasket on the flange. The inner ring acts as a compression stop and is used to fill the annular space between the flange bore and the gasket inside diameter to minimize turbulence of process fluids and erosion of flange faces.
In certain applications, it is necessary to utilize a spiral-wound outer and/or inner ring. The spiral-wound outer or inner rings are used primarily as reinforcement and are chosen instead of a solid metal ring, because of lower costs or because of limited space when the use of a solid metal ring would be prohibited due to the difficulty in fabrication or usage.
Can be used over the complete temperature range from cryogenic to approximately 2000° F.
Manufactured to ASME B16.20 specifications.
Can be used in all pressures from vacuum to the standard 2500 psi flange ratings.
