Valve for a packaging container

A valve for a packaging container, comprising at least one base film (10) with an opening (11), at least one frame film (13) encompassing a free region (17), and at least one membrane (12) which is arranged on the base film (10) and covers the opening (11), wherein a fluid is provided between the membrane (12) and the base film (10),

• wherein the membrane (12) is connected to a surrounding film (20) via at least one connection region (22), the surrounding film (20) being connected on one side to the base film (10) and on its other side to the frame film (13), wherein the membrane (12) is arranged movably within the free region (17), wherein the surrounding film (20) includes an outer perimeter, and wherein the outer perimeter of the surrounding film (20) is open at least in one point such that a channel (18) is formed in the surrounding film (20).