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WHAT IS A SPIRAL WOUND GASKET?
Introduction to Spiral Wound Gasket (SWG):
A Spiral Wound Gasket (SWG) is a type of industrial gasket that is widely used in high-temperature, high-pressure, and corrosive environments. It consists of a V-shaped metal strip and a softer filler material that is wound in a spiral fashion to create a resilient sealing surface. This article will discuss the construction, types, advantages, applications, factors to consider, installation, maintenance, challenges, and importance of Spiral Wound Gaskets.
What are the materials used in Spiral Wound Gaskets (SWG)?
Construction of Spiral Wound Gaskets:
Compared to metal wound gaskets, ShilongSeals metal wound gaskets achieve a good seal under lower stress (bolt load). Durable LongTM metal wound gaskets can be produced according to various international and industry standards, such as ASME B16.20,DIN,BS,JIS,GB,HG standards and so on. The quality assurance system conforms to ISO9001 standard.
| Types of Filler Materials Used in Spiral Wound Gaskets (SWG): | ||
| Filler Material | Abbreviation | |
| Graphite | Graphite is a popular filler material due to its excellent thermal and chemical resistance. | F.G. |
| PTFE(Polytetrafluoroethylene) | PTFE is another popular filler material known for its chemical resistance and low coefficient of friction. | PTFE |
| Mica | Mica filler material is known for its excellent heat resistance and is often used in high-temperature applications. | Mica |
| Non-Asbestos | Non-asbestos filler materials are used in applications that require good chemical resistance without using asbestos. | NAS |
| Ceramic | Ceramic filler material is ideal for applications that require high-temperature resistance and good electrical insulation. | CR |
| Product Description |
| Basic Type |
| With Inner Ring Type |
| With Outter Ring Type |
| With Outter&Inner Ring Type |
| With Ribs Type for Heat Exchanger |
| Special Type |
Construction of Spiral Wound Gaskets:
The construction of a Spiral Wound Gasket comprises four main parts: the centering ring, inner ring and winding strip that includes stainless steel belt and filler material.
The centering ring is made of carbon steel or stainless steel, and it acts as a compression stop to prevent over-compression and gasket blowout.
The inner ring is made of the same material as the winding strip, and it provides additional support to the gasket.
The winding strip is typically made of stainless steel or other alloys and is wound in a spiral fashion to create the gasket's sealing surface. The filler material is placed between the winding strip to enhance the gasket's sealing properties.
By matching different pressures, tensile forces and the thickness of non-metallic packing, the load or compression force required to compress the gasket will be very different. Generally speaking, the higher the density of the wound part, the higher the pressure class, the higher the load required to compress the gasket.
In low pressure classes,flange connections can provide lower compression loads. The low stress winding gasket needs to have a suitable gasket coefficient to achieve a good sealing effect. For
low-pressure tight stress conditions, we can customize the gasket winding density according to the specific requirements of the user's working conditions to ensure the sound sealing effect.
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