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Spiral Wound Gasket
Spiral Wound Gasket is the ideal gasket in the semi-metallic category. A narrow strip of V-shap metal hoop is spirally wound under tension with a filler cushion between the lami nation of the metal and is spot-welded at both ends.
This unique construction of a spring-like metal and soft filler provides gasket excel-lent characteristics. |
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Resistance to high temperature and high pressures.
Great resilience which allows the gasket to adjust automatically to change in operating conditions, such as pressure and thermal shocks, vibrations etc.
Excellent sealability is maintained with comparatively small gasket area.
Good tolerance for flange surface finish irregularities.
Can be designed to any dimensions economically in circular or moderately noncircular shape.
Available in a variety of hoop metals and filler materials to satisfy specific operating conditions. |
Material & Structure
Type |
Cross section |
Hoop material |
Filler material |
Inner, Outer ring ma |
Normal Thickness |
Basic type |
|
SUS304£¬316£¬321Ti,Monel etc. As specified Stainless steel tape. |
Asbestos |
Carbon steel sheetor SUS304£¬306 etc. As specified sheet |
V-shaped |
W-shaped |
With inner ring |
|
Non-asbestos |
3.2
4.5 |
2.5
4.8
5.5
7.5 |
With outer ring |
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Expanded graphite |
With inner & out ring |
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PTFE |
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Gross section and Number
Type |
Hoop material |
Asbestos |
Non-asbestos |
Graphite |
PTFE |
Basic type |
SUS304 |
104 |
204 |
304 |
404 |
SUS316 |
106 |
206 |
306 |
406 |
As specified |
109 |
209 |
309 |
409 |
With inner ring |
SUS304 |
114 |
214 |
314 |
414 |
SUS316 |
116 |
216 |
316 |
416 |
As specified |
119 |
219 |
319 |
419 |
With outer ring |
SUS304 |
124 |
224 |
324 |
424 |
SUS316 |
126 |
226 |
326 |
426 |
As specified |
129 |
229 |
329 |
429 |
With inner & out ring |
SUS304 |
134 |
234 |
334 |
434 |
SUS316 |
136 |
236 |
336 |
436 |
As specified |
139 |
239 |
339 |
439 |
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PTFE SPIRAL WOUND GASKET
The gasket uses unsintered PTFE tapes as the filler material. The PTFE filler provides superior chemical resistance and sealabining with strongly corrosion resistant metals, it can be applied for corrosive fluids, pure oxygen gas and vacuum lines.
Feature
1. Sealability is superior to that of other SWG gasket. Usage is possible even with vacuum lines.
2. Excellent corrosion resistance makes it suitable for almost all types of fuild by selecting appropriate hoop materials.
3. Not used for glass or rubber lined flange, glass or porcelain flange. |
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Service Range
fluid |
Maximum service temperature ¡ãC |
Maximum service pressure |
Water type fluids |
300 |
Class 600 |
Oil type fluids |
300 |
Class 600 |
Gas type fluids |
300 |
Class 600 |
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GRAPHITE SPIRAL WOUND GASKET
The gasket uses expanded graphite tape as the filler material which provides superb sealability even under severe conditions such us high temperature, high pressure, cryogenic temperatures, heat cycles, temperature cycles and so on.
Feature
1. Sealing, especially gas sealing, is superior to that of asbestos gaskets.
2. Little deterioration of the filler material at high temperatures, outstanding long-term sealability even under high temperatures and high pressures.
3. Sealing remains outstanding even under servere conditions such as pressure fluctuations and heat cycles.
4. Excellent sealability is maintained making it possible to apply this for corrosive fluids by selecting the appropriate materials.
5. Outstanding sealing even at cryogenic temperatures. |
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Service Range
fluid |
Maximum service temperature ¡ãC |
Maximum service pressure |
Water type fluids |
450(650) |
Class 2500 |
Oil type fluids |
450(800) |
Class 1500 |
Gas type fluids |
450(800) |
Class 1500 |
Cryogenic temperature fluid |
-240 |
20 Mpa |
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| Notes: The values in brackets() are maximum service temperature under a non-oxidizing atmosphere. When using with RF flanges in open air, the Max. service temperature is 450¡ãC. |
