Patent ID: 8499784

Claim:
An air-lock valve comprising: a housing having an opening configured to be traversed by a flexible band substrate; and at least one moveable sealing body cooperating with a sealing surface of the housing for closing the opening during a closing phase of the air-lock valve, with the band substrate being clamped between the at least one movable sealing body and the sealing surface; wherein the sealing surface surrounds the opening, and the opening is closed by pressing the at least one movable sealing body upon the sealing surface and/or upon the band substrate traversing the opening such that the at least one movable sealing body closes the opening at least through indirect abutting at edges of the sealing surface; and wherein the at least one movable sealing body and the sealing surface each have an arcuate contour and a radius of the sealing surface is larger or equal to the radius of the at least one movable sealing body.