Spiral wound gaskets are special semi-metallic gaskets of great resilience, therefore they are very suitable for applications featuring heavy operating conditions. Spiral wound gaskets are manufactured by spirally winding a V-shaped metal strip and a strip of non-metallic filler material. The metal strip holds the filler, providing the gasket with mechanical resistance and resilience. Spiral wound gaskets can be reinforced by an outer and/or inner retaining ring. The outer centring ring controls the compression and holds the gasket centrally within the bolt circle. The inner retaining ring increases the axial rigidity and resilience of the gasket. Spiral wound gaskets should always be in contact with the flange and should not protrude into the pipe or project from the flange. Spiral wound gaskets can be used for sealing flange joints, manhole and handhold covers, tube covers, boilers, heat exchangers, pressure vessels, pumps, compressors and valves; in industries such as petrochemical, pharmaceutical, shipbuilding, and food processing, in power industries and nuclear power stations. They are ideal for steam, oil, liquids, gases, acids, alkalines, various organic media and solvents.
 

Advantages

Sealing under heavy operating conditions
Strong stress compensation, stable and reliable sealing performance even under frequent pressure fluctuation condition
Solid construction provides stability and saleability even when the sealing surfaces are slightly corroded or bent
Easy installation
Shape and construction

DONIT TESNIT® spiral wound gaskets are produced in several styles and combination of materials to fit the most stringent application. DONIT TESNIT® spiral wound gaskets are usually of circular shape, however DONIT TESNIT® can produce them in other shapes such as: oval, rectangular, with round edges, etc. Our standard production program comprises a range of spiral wound gaskets with inner diameters of 10 to 2200mm and a nominal thickness of 3.2, 4.5 and 6.5 mm. Wound gaskets of non-standard dimensions and shapes, and larger diameters are available on request.
 
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