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Ret ring with concentric serrations made ofvarious types of metal.Used when bolting force is not sufficient to seal a flat gasket,because it contacts flange face only at serration peaks.Commonly used on valve bannets and flanges attached to equipment 3 types of cross section as per right table are available.
Type & Cross Section
Depth of Serration(t)
|less than 10mm||inner diameter less than 200mm;0.75mm||0.5mm|
|10mm and above||1.0mm|