The following is about Lens Ring Gasket related, I hope to help you better understand Lens Ring Gasket.
Lens ring gaskets have spherical sealing faces designed to fit mating flanged recesses, providing a high pressure/temperature metal to metal seal. Available in standard RTJ gasket materials and made to DIN standards, the lens ring, as with all RTJ type gaskets, should be softer than the flange material.
Lens Ring Joint Gasket Drawings:
