Overview
The D-Type Spiral Wound Gasket with Inner and Outer Rings is a high-performance sealing solution engineered for critical flange connections in piping and pressure vessel systems. This gasket conforms to the GB/T4622.2-2003 standard, designed for nominal pipe size DN20 (approximately 0.87 inches) and a pressure rating of PN25 (approximately 362.5 PSI). Its robust, multi-layer metal and filler construction ensures a reliable, leak-tight seal in high-temperature and high-pressure service environments.
Key Features
Multi-layer spiral wound construction for superior resilience and sealing D-Type design includes integral inner and outer containment rings 304 stainless steel winding strip for core strength and corrosion resistance 316L stainless steel inner and outer rings for enhanced gasket protection and flange alignment
Flexible graphite filler providing excellent thermal conductivity and sealability
Engineered to handle thermal cycling and system pressure fluctuations
Specifications
Gasket Type: D-Type (Spiral Wound with Inner & Outer Rings) Standard: GB/T4622.2-2003 Nominal Size: DN20 (0.87 inches) Pressure Class: PN25 (362.5 PSI) Part Number / Designation: D2424 Winding Material: 304 Stainless Steel Filler Material: Flexible Graphite Inner Ring Material: 316L Stainless Steel Outer Ring Material: 316L Stainless Steel Unit: Sold as 1 individual gasket
Applications
Sealing flanges in chemical and petrochemical processing pipelines High-pressure steam lines and boiler feed systems Heat exchangers, valves, and pump connections
Refinery and power generation infrastructure Any application requiring a robust, temperature-resistant seal for ANSI/ASME or DIN standard flanges
