Spiral Wound Gasket kianwasher（缠绕式垫片kianwasher）.pdfVIP

Spiral Wound Gasket A requirement of any gasket is the ability to recover under variable loads. The effects of pressure and temperature fluctuations, the temperature difference across the flange face,along with flange rotation, bolt stress relaxation and creep, demand a gasket with adequate flexibility and recovery, to maintain a seal under variable working conditions. The spiral wound gasket, invented by KWS meets these requirements. A spiral wound gasket is manufactured by spirally winding a preformed metal strip and a filler on the outer periphery of metal winding mandrels. The winding mandrel outside diameter forms the inner diameter of the gasket and the superposed metal and non-metallic windings are continually wound until the required outer diameter is attained. Normal practice is to reinforce the inner and outer diameters with several plies of metal without fillers. This engineered product is “tailor made” to be compatible with the flange closure in which it is to be used. Semi-metallic gaskets can be manufactured from a range of filler materials according to different service conditions: Filler Material Maximum Temperature ASME B16.20 Colour Coding Graphite 550°C Grey Stripe PTFE 260°C White Stripe Mica 1000°C Light Green Stripe Mica and Graphite 900°C Winding Material Maximum Temperature ASME B16.20Colour Coding Carbon Steel 500° C Silver 304 Stainless Steel 650°C Yellow 316L Stainless Steel 800°C Green Duplex UN S31803 800°C N/A 347 Stainless Steel 870°C