When purchasing a metal wound gasket, it's crucial to assess its quality to ensure it meets the required standards. Failing to do so can lead to serious issues during production, causing unnecessary delays and costs. Here are some key points to help you evaluate the quality of a metal wound gasket:
1. The surface of the gasket body should be free from scratches, dents, voids, or rust spots. Any such defects can compromise its performance.
2. The sealing filler material should be evenly distributed and protrude smoothly from the metal strip, with a flat and even surface.
3. The welding process must be precise, without any issues like under-welding or over-welding that could weaken the structure.
4. The inner and outer rings, as well as the gasket body, should be flat, with unevenness not exceeding 1%.
5. The inner reinforcing ring should be securely fastened to the gasket body to prevent movement during installation or operation.
6. Check for looseness caused by excessive clearance between the outer reinforcing ring and the gasket body, which can affect sealing effectiveness.
7. Ensure there is a proper marking on the outer reinforcing ring indicating the type and specifications of the gasket.
Metal wound gaskets are known for their excellent resilience and are widely used in various industrial applications. They are constructed using V-shaped or W-shaped thin steel strips combined with flexible materials like graphite, asbestos, or PTFE. This design allows for different levels of compression based on specific sealing requirements. The inner and outer steel rings help control the maximum compression, making them ideal for flange joints where the sealing surface may not be perfectly smooth.
These gaskets are particularly suitable for environments with uneven loads, fluctuating pressure, temperature changes, or vibration. They are commonly used in valves, pumps, heat exchangers, towers, manholes, and other critical connections across industries such as petrochemical, power generation, machinery, metallurgy, shipbuilding, pharmaceuticals, and aerospace.
There are several types of metal wound gaskets, including basic models, those with outer rings, inner rings, both inner and outer rings, ribbed versions for heat exchangers, and custom-shaped gaskets. The basic type typically uses high-quality stainless steel (SUS304, SUS316) in V or W shapes, combined with soft filler materials. The metal strips are spot-welded at the beginning and end to maintain structural integrity.
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