Patent ID: 8192548

Claim:
An arrangement for coating a substrate comprising: an evaporation source for the evaporation of materials with which the substrate is to be coated; a vapor conducting arrangement from the evaporation source to the substrate, said vapor conducting arrangement including at least two tubes which are perpendicular to each other; and a valve comprising a mechanical vapor barrier in the vapor conducting arrangement; wherein the mechanical vapor barrier comprises a sphere at an opening of one of the tubes being connected to a rod, a ram within a ram guide, a rod that is arranged in parallel with one of the tubes which are perpendicular to each other; and a spherical calotte connected to a sphere, wherein, when the sphere is raised upwardly by the rod, it closes the spherical calotte so that the contamination of the rod, the ram and the spherical calotte with vaporized material is prevented; wherein the arrangement further comprises a hemispherical calotte, which is attached to a neck shaped cylindrical body at the top, which is further tied to the ram, and wherein said hemispherical calotte, cylindrical body and ram are enclosed within the valve, which is perpendicularly attached to a tube; wherein the valve is heatable to at least 500° C.