The core structure of a ANSI B16.20 spiral wound gasket is formed by alternately winding metal strips and filler materials. Common filler materials include graphite, polytetrafluoroethylene (PTFE), and mica. The graphite filler layer exhibits excellent high-temperature resistance, capable of withstanding continuous operating temperatures up to 600℃. The PTFE filler layer, on the other hand, is more suitable for highly corrosive media but has limitations in high-temperature applications. These filler materials are tightly wound between metal strips to create a multi-layered sealing structure.
Based on different application requirements, 304 metal spiral wound gaskets can be categorized into several types. The basic type, without inner or outer rings, is suitable for general flange sealing. The inner ring type features an additional metal ring on the inner side of the gasket, preventing over-compression and protecting the filler material. The outer ring type includes a metal ring on the outer side, facilitating installation and positioning. The inner and outer ring type combines the advantages of both, making it ideal for high-sealing-demand applications. Selection criteria include flange surface form, medium characteristics, and working pressure.
Type: Spiral Wound Gasket, with Inner and Outer Ring.
Inner Ring: Stainless Steel (SS) 304;
Hoop: SS 304;
Filler: Graphite.
Class: 150# (PN20).
Size: 6 Inch (DN150).
Standard: ANSI B16.20.
Surface finished: Yellow Color.
ANSI B16.20 Spiral Wound Gasket:pipe@gneetube.com
