The basic metal spiral wound gasket is an important sealing component. Metal spiral wound gaskets are widely used in industries such as petroleum, chemicals, metallurgy, power generation, and shipbuilding. They serve as critical components in equipment such as pressure pipelines, gate valves, pumps, and heat exchangers in China. Therefore, selecting and using high-quality spiral wound gasket products is of great significance for ensuring the safety of main equipment and the normal operation of pressure pipelines.

Points to Consider When Purchasing D-Type Metal Spiral Wound Gasket Products:

• Select the sealing gasket based on operating conditions and the type of flange sealing surface.
• Use products from enterprises with a comprehensive quality certification system and valid consumer goods certification.
• Ensure the use of special equipment (pressure piping components) manufacturing approval certificates and valid enterprise product test reports.
• The main surface of the sealing gasket should be free of defects that could affect sealing performance, such as gaps, unevenness, or rust.
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The non-metallic strip on the main surface of the sealing gasket should have an average value slightly higher than that of the metal strip. The solid line should be clear but should not expose the metal strip. The spot welding intervals of the metal spiral wound gasket should be uniform and free from defects such as incomplete fusion or over-fusion. The improved ring's surface should be free of burrs, unevenness, rust, and other defects. The spacing between the upper and lower sealing surfaces of the sealing gasket body and the upper and lower appearances of the improved ring should be the same. The improved ring and the sealing gasket body should be tightly fixed without looseness.

The ring of the metal spiral wound gasket with an outer ring should remain positioned relative to the gasket body, with appropriate looseness allowed. Shrinkage rate, recovery rate, and sealing performance are important performance indicators for sealing gaskets. Generally, the higher the recovery rate, the better; provided that the recovery rate meets the specified requirements, the measured shrinkage rate should also be relatively high. Products with good sealing performance, an appropriate shrinkage rate, and a high recovery rate should be selected.