Overview
The D-Type Spiral Wound Gasket with Inner and Outer Rings is engineered for creating robust, leak-tight seals in high-pressure and high-temperature flange connections. This specific configuration, compliant with the GB/T4622.2-2003 standard, is designed for a nominal pipe size of 1.5 inches (DN40) and a pressure rating of 16 bar (PN16). It combines the flexibility of a spirally wound sealing element with the mechanical reinforcement of concentric metal rings, delivering superior performance in challenging industrial piping systems.
Key Features
D-Type construction with integral inner and outer reinforcing rings for enhanced stability Sealing element wound with a combination of 316L stainless steel and PTFE (polytetrafluoroethylene) The outer ring provides compression control and prevents over-torquing of the gasket
The inner ring offers radial support and protects the winding from internal media flow
Excellent resilience and recovery to maintain seal integrity under variable pressures and temperatures
PTFE filler provides strong chemical resistance against a wide range of corrosive fluids
Specifications
Gasket Type: D-Type (Spiral Wound with Inner & Outer Rings) Nominal Size: DN40 (for 1.5-inch nominal pipe bore) Pressure Rating: PN16 (approximately 232 PSI) Standard: GB/T4622.2-2003 Construction: 316L Stainless Steel (Outer Ring) / 316L Stainless Steel (Winding Metal) / PTFE (Filler) / 316L Stainless Steel (Inner Ring) Overall Outer Diameter: 4.433 inches (D4434 designation) Package Quantity: 1 unit
Applications
Ideal for sealing flanges in chemical and petrochemical processing plants Suitable for use in oil and gas pipelines, refineries, and power generation facilities Effective in applications involving steam, hydrocarbons, and various aggressive chemicals Commonly used in heat exchangers, valves, pumps, and other critical pressure vessel connections
