Special Materials Spiral Wound Gaskets

Sealing principle

The sealing principle of special materials spiral wound gaskets is mainly based on the elastic and plastic deformation of the gasket material. When the gasket is under pressure, the metal strip will bend, elongate, and shrink, causing the non-metallic material to fill between the sealing surfaces to form a certain sealing force.

In addition, the plastic deformation of the gasket material can fill the gap in the sealing surface, block the leakage channel, and further improve the sealing effect.

Structure and Material

■ The structure and material of special spiral wound gaskets vary depending on the specific type. Generally speaking, spiral wound gaskets are composed of metal strips, filling materials, and upper and lower sealing materials.

1. Metal strips are usually made of stainless steel, copper, aluminum, and other metal materials and have the characteristics of high strength, high wear resistance, and corrosion resistance.

2. The filling material usually uses flexible graphite, PTFE, and other materials to enhance the sealing performance and high-temperature resistance of the gasket.

3. The upper and lower sealing materials usually use rubber, polytetrafluoroethylene, and other materials to enhance the sealing performance and corrosion resistance of the gasket.

■ In terms of structure, special materials spiral wound gaskets can be divided into single-layer metal spiral wound gaskets and multi-layer metal spiral wound gaskets. Single-layer metal spiral wound gaskets are made of a layer of metal strips, while multi-layer metal spiral wound gaskets are made of multiple layers of metal strips. Between the layers, they are connected by welding, soldering, or pressure welding.

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