Spiral Wound Gaskets with Graphite or PTFE Filler

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Spiral Wound Gasket
Spiral Wound Gasket Characteristic
A spiral wound gasket may include a centering ring, an inner ring or both. The outer centering ring enters 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. Resilience and strength make spiral wound gaskets an ideal choice under a variety of conditions and applications. Widely used in refineries and chemical processing plants, spiral wound gasket are also effective for power generation, aerospace, and a variety of valve and special applications. The spiral wound gasket industry is looking for change in the specification covering spiral wound gasket. As environmental regulations and industry requirements become increasingly stringent, new and custom applications are continuing to evolve. Wherever you need a strong, resilient seal, our spiral wound gaskets provide an effective solution.
TYPE OF SPIRAL WOUND GASKET

SW - Basic Type Basic construction type, inner and outer diameters are reinforced with several piles of metal without filler to give greater stability and better compression characteristics. - Suitable for tongue and groove, male and female or grooved to flat face flange assemblies.
SWI - Inner Ring Type Solid inner metal ring acts as a compression stopper. To prevent accumulation of solids, reduce turbulent flow of process fluids and minimize erosion, damages of gasket between flange bore and the inside diameter, the annular space is filled up by solid inner metal ring. - Suitable for male and female pipe flanges.
SWC - Outer Ring Type Solid outer ring accurately locates the gasket on the flange face to give the additional radial strength to prevent the gasket blowout and acts as a compression limiter. In case of installing the outer ring, it is very easy to install the gasket to flange face because the end of outer ring will touch at bolts - Suitable for use with flat face and raised face flanges. For class 900 and above an internal ring is recommended.
SWCI - Inner & Outer Rings Type A inner ring and outer ring type gasket will give an additional compression limiting stopper for gasket inner and outer side. It will prevent the corrosions on flange face at annular space. - Suitable for use with flat face and raised face flanges and specified for high pressure / temperature service - Class 900 and above or where corrosive or toxic media are present.

AVAILABLE GASKET MATERIALS

Materials of Steel Belt and Inner and Outer Rings		Fillers			General Thickness (mm)
Name	Code	Name	Code	Applicable Temperature?	V-shaped Gasket/Ring	W-shaped Gasket /Ring
Carbon Steel	CS	Asbestos	ASB	500	3.2/2.0 4.5/3.0 5.5/3.0	4.8/3.0 7.2/4.0
Stainless Steel	304(L),316(L)	Graphite	FG	650
Monel	Mon	Tetrafluoro	PTFE	260
Nickel, Titanium	Ni,Ti	Mica	MICA	850
Inco Nicke	Inconel	Ceramics	CER	1300
Hastelloy Alloy	HAST	Non Asbestos	NAF	500

Flexible graphite has been carefully researched and developed to meet industry's demand for a superior alternative to asbestos filler in spiral wound gaskets. Flexible graphite provides performance that is superior to asbestos, and has been field proven through year of actual service in critical applications throughout the world.
Flexible graphite is pure graphite and is manufactured without the use of filters, resins or binders that could deteriorate at elevated temperature.
PTFE : If PTFE is subjected to temperatures above 250 composition starts to occur slowly, increasing rapidly above 400.
Care should be taken to avoid inhaling the resultant fumes, which may produce unpleasant effects.

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Cixi Highnew Sealing Material Co.,Ltd

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