General precision lathe metal stainless steel flat washers two processed into concentric grooves, depending on the medium, you can choose flexible graphite, PTFE, asbestos Board, or some other soft metals, paste the second surface of the gasket. Can also be used without sealing layer, and can achieve good sealing effect, but easy on the surface of the flange in the pressures lead to losses.
This type of gasket flange seal surface and divided into two basic types:
1. for flat flange type tooth with positioning ring cushions
2. for male and female flanges without a ring pad with teeth.