Metal spiral wound gasket

General Features

A metal spiral wound gasket is a semi-metal flat gasket made by spirally winding a metal belt and a non-metal belt. Its characteristics are: compression, good elasticity; multi-channel seal and a certain degree of self-tightening function; less sensitive to the flange sealing surface defects, do not bond flange sealing surface; easy to center, convenient disassembly Can partially eliminate the effects of pressure, temperature changes and mechanical vibration; can maintain excellent sealing performance in a variety of harsh conditions such as high temperature, low temperature, high vacuum, impact vibration and other cyclic alternation.

SKU: DP3100 Category:



Thickness: 2.5, 3.2, 4.5, 6.5, 8mm, etc.
Nominal diameter: φ10~φ3000mm


Basic, In-Ring, Locating Ring, Inner Ring, and Positioning Ring


Widely used in petroleum refining, petrochemical, electric power, gas, nuclear power, aerospace, textile, metallurgy, shipbuilding, and pharmaceutical industries. It is used to seal the flange joints of pipelines, valves, pumps, pressure vessels, condensers, heat exchangers, manholes, and hand holes.


Packing Bands for Temperature and Pressure

Fill Belt TypeUsage temperature/°CMaximum working pressure/MPa
Flexible graphite-196~60030

Plates, Codes, and Applicable Temperatures of Common Metal Strips

GradeCodeWorking Temperature/°C


022 Cr19Ni10304L-196-450

Technical Parameters

Compression ratio%18~30
Rebound rate%≥17
Stress relaxation rate%≤15
Seal Leakage Ratecm3/s≤1.2×10-5

Installation Instructions

Before installation, the flange surface must be carefully cleaned with a brush to ensure that there is no foreign material on the flange surface. Ensure that the flange surface is flat, free from distortion, and scratches that do not affect sealing. Clean the fasteners to ensure that there are no foreign objects between and around the fasteners.
Make sure the mating flange is aligned during installation.
When tightening bolts, the gasket should be evenly stressed and tightened symmetrically.

In the installation process, observe whether the seal surface of the gasket has a radial penetration flaw that affects the seal, and replace the gasket if it is present.

TypeCodeApplicable flange sealing surface pattern
BasicASink surface
In-band loopBConvex surface
With locating ringCFace and Full Plane
With inner ring and locating ringDFace and Full Plane

Gasket Type and Flange Selection

Dimensional Measurement Range

Diameter Deviation of Inner and Outer Diameter of Sealing Element, Inner Ring and Positioning Ring (Unit: mm)

Nominal SizeSeal ElementInner Ring, Positioning Ring