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.
> Lens ring joint used in higher pressure then 3,000 lbs. > These gaskets had been used on pipe flanges in synthesizing line.