Lens Gasket is a line contact seal for use in high pressure piping systems and in pressure vessel heads. The lens cross section is a spherical gasket surface and requires special machining on the flanges. Since the contact area is very small and gasket seating pressures are very high, the gaskets will seat with a small bolt load.
Single use seal on ultra high vacuum flanges. Copper solid gaskets fit between the same size UHV/CF flanges to make a impermeable seal. Copper is relatively soft, the steel knife edges of the flanges bite down on the copper as the flanges are tightened toward each other.
> Ring Joint Gaskets are for oilfield and process industry duties. > Octagonal shape gasket is belong to API 6A R series > These gaskets are used in pressures up to 10,000 PSI, more than Oval ring joint. > The oval type is the only gasket that will fit a bottom radiused groove. > Gaskets and not re-used after torque.