Manufactured in Accordance with ASME B16.20
Spiral wound gaskets — made with an alternating combination of formed metal wire and soft filler materials — form a very effective seal when compressed between two flanges. A V-shaped crown centered in the metal strip acts as a spring, giving the gaskets greater resiliency under varying conditions. Filler and wire material can be changed to accommodate different chemical compatibility requirements. If the load available to compress a gasket is limited, gasket construction and dimensions can be altered to provide an effective seal.
A spiral wound gasket may include a centering ring, an inner ring or both. The outer centering ring accurately positions the gasket within the flange and acts as a compression limiter, while the inner ring provides additional radial strength. The inner ring also reduces flange erosion and protects the sealing element.
Resiliency and strength make spiral wound gaskets an ideal choice under a variety of conditions and applications. Widely used throughout refineries and chemical processing plants, they are also effective for power generation, aerospace, and a variety of valve and specialty applications.
The ASME B16.20 gasket specification has been updated and changed to a new recommended standard. The new criteria incorporates a default to inner rings in all graphite-filled spiral wound gaskets unless the purchaser specifies otherwise. However, they will still be stamped with and in compliance to the ASME B16.20 standard.
Standard with outer centering ring which is suitable for raised face and flat face applications up to class 2500#. Outer ring acts as a compression limiter in conjunction to centering the gasket on the flange.
Standard with outer centering ring and inner ring which is suitable for raised face and flat face applications up to 2500#. Outer ring acts as a compression limiter and helps prevent inward buckling of the spiral wound sealing element. Recommended for higher pressure applications or where suggested by ASME B16.20.
Style CW spiral wound gasket is comprised of the sealing element only. Commonly used in tongue and groove, male-female or groove to flat flange faces.
Style CWI is comprised of the spiral wound sealing element with the addition of an inner retaining ring. Commonly used in tongue and groove, male-female or groove to flat flange faces.