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The
spiral wound gasket depends upon the mechanical
characteristics of a formed metal spiral strip,
rather than the compressive virtues of more traditional
gasket materials. This makes it particularly suitable
for low or fluctuating bolt loads. The sealing
strips, or fillers, are usually graphite, although
other materials such as P.T.F.E may be used, the
windings are always s/steal. For this type of
gasket to work the spiral must not be over compressed,
hence one of two types of compression control
is usually used.
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The
completed gasket is fitted into a steel ring of
specific thickness. When the gasket is fitted
into a flange and the bolt load is applied, flange
closure is governed by the outer steel ring of
the gasket. To further improve the pressure rating
of the spiral wound gasket, a steel ring may be
added to the inside. This also protects the windings
(particularly the filler) , from contamination,
or attack by, the product. |
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The
second usually compression control is not fitted
to the gasket at all, but engineered into the
flange. These Gaskets are called Unsupported Spiral
Wound Gaskets. |
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| METAL
WINDING STRIP |
FILLER
MATERIALS |
GUIDE
RING MATERIALS |
| Stainless
Steel 316
|
Asbestos
Fiber
|
Carbon
Steel |
| Stainless
Steel 304 |
Non-Asbestos
Fiber |
Stainless
Steel 304 |
| Stainless
Steel 321 |
P.T.F.E |
Stainless
Steel 316 |
| Stainless
Steel 347 |
Graphite |
Stainless
Steel 321 |
| Monel
C400 |
Ceramic
|
Stainless
Steel 347 |
| Nickel
200 |
|
Stainless
Steel 4l0 |
| Inconel
600 |
|
Monel
400 |
| Titanium
|
|
Inconel
600 |
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Titanium |
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