What is the difference between Type A and Type B spiral wound gaskets
author: www.qishine.com
2026-03-02
The core differences between Type A and Type B spiral wound gaskets lie in their structural design and applicable flange types. Type A is the basic type (without rings) and is suitable for tongue-and-groove flanges. Type B includes an inner ring (reinforcing ring) and is suitable for male-and-female flanges.
? Structural Differences
Type A spiral wound gaskets(Basic Type): Consists only of a metal strip (such as stainless steel) and a non-metal filler strip (such as graphite), with no inner or outer ring.
Type A spiral wound gaskets(Basic Type): Consists only of a metal strip (such as stainless steel) and a non-metal filler strip (such as graphite), with no inner or outer ring.
Type A Spira wound gasket: only basic ring
Type B spiral wound gaskets (Inner Ring Type): Adds a metal inner ring (usually of the same material as the metal strip) to the Type A design. The inner ring is fixed by spot welding to prevent the winding layers from loosening.
Type B Spira wound gasket: Basic Ring and Inner Ring
⚙️ Applicable Flange Types
Type A: Specifically designed for tongue-and-groove flanges (TG face), relying on the flange groove for positioning and sealing.
Type A: Specifically designed for tongue-and-groove flanges (TG face), relying on the flange groove for positioning and sealing.
Type B: Specifically designed for male-and-female flanges (MFM face), where the inner ring fits into the groove to enhance stability.
Type A(applicable to tenon-slot face flanges) VS Type B(applicable to concave-convex face flanges)
Functional Features
Advantages of Type B:
- The inner ring resists medium corrosion and mechanical impact, extending the service life.
Advantages of Type B:
- The inner ring resists medium corrosion and mechanical impact, extending the service life.
- Prevents excessive compression deformation of the gasket, making it suitable for uneven loads or vibration scenarios.
Features of Type A: Simple structure, lower cost, but dependent on the precision of the flange groove. Improper installation may cause displacement.
What other types of spiral wound gaskets are there besides Type A and Type B? Follow us and stay tuned!
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