Spiral wound gasket is a kind of sealing gasket widely used at present. It is the gasket with the best resilience in the semi-metallic sealing gasket. It is made of V-shaped or W-shaped thin steel strip alternately wound with various fillers. It can withstand high temperature, high pressure and adapt to the conditions of ultra-low temperature or vacuum. By changing the material combination of gasket, the problem of chemical corrosion of gasket caused by various media can be solved. Its structure is dense The degree can be made according to different locking force requirements. In order to strengthen the main body and accurate positioning, spiral wound gasket is equipped with metal inner reinforcing ring and outer positioning ring. The inner and outer steel rings are used to control the maximum degree of compression. The surface accuracy requirements of flange sealing surface contacted by gasket are not high.

Type of spiral wound gasket:

（1） Basic type spiral wound gasket (type a spiral wound gasket)

（2） Metal winding pad with inner ring (B-type winding pad)

（3） Spiral wound gasket with outer ring (C-type spiral wound gasket)

（4） With inner and outer ring type metal winding pad (D type winding pad)

（5） Spiral wound gasket (with reinforcement) for heat exchanger

（6） Special spiral wound gasket

Structural materials of spiral wound gasket:

Maximum operating pressure of inner and outer ring temperature (° C) of filler steel strip

Asbestos winding SUS304 carbon steel (304) - 200-550 250kg / cm2

Graphite wound SUS304 carbon steel (304) - 150-450 100kg / cm2

Teflon wound SUS304 carbon steel (304) - 240-260 100kg / cm2

Form of flange and spiral wound gasket:

Flange type spiral wound gasket shape

Flat flange only with outer ring spiral wound gasket or with inner and outer ring spiral wound gasket

Raised face flange only with outer ring spiral wound gasket or with inner and outer ring spiral wound gasket

Basic spiral wound gasket of concave convex flange or spiral wound gasket with inner ring only

Basic spiral wound gasket of groove flange or spiral wound gasket with inner ring only

Plain and grooved flange basic spiral wound gasket or with inner ring spiral wound gasket only

Technical parameters of spiral wound gasket:

Spiral wound gasket coefficient M = 2.5 ~ 4

Service pressure of spiral wound gasket ≤ 25MPa

Service temperature of spiral wound gasket - 196 ° C-700 ° C (not higher than 600 ° C in oxidizing medium)

Minimum preload of spiral wound gasket y = 68mpa

Purpose of spiral wound gasket:

The metal spiral wound gasket with good resilience can automatically adjust the pressure thermal cycle and vibration of the pipeline system, especially for the occasions with uneven load, easy relaxation of joint force, periodic change of temperature and pressure, impact or vibration. It is the static sealing element of flange joints of valves, pumps, heat exchangers, towers, Manholes, handholes, etc. it is widely used in petrochemical, mechanical, electric power, metallurgy, shipbuilding, medicine, atomic energy, aerospace and other departments.

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