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Lens ring flange joints and how they are machined How does a lens ring joint create a seal? The lens ring gasket is a made using a metal softer than the flange so that the gasket plastically deforms on compressive load, rather than the flange The lens cross section includes a spherical sealing surface and requires special angles machined on the 2 connecting flange surfaces In accordance with DIN 2696 and to meet ASME B16 5 standards, only