Closing-element movement apparatus having: • a fluid system , which has ∘ a first deformable container , which, in a manner dependent on a degree of deformation of the first container, forms a store volume which is able to be varied between a first size (S, S2) and a second size (S', S2'), ∘ a second deformable container , which, in a manner dependent on a degree of deformation of the second container, forms a working volume which is able to be varied between a first size (A, A2) and a second size (A', A2'), ∘ a connecting line , which fluidically connects the first container to the second container , and ∘ a working fluid, which is contained in the fluid system , • an actuation element , by means of which the first container is able to be selectively deformed in order to vary the store volume between the first size (S, S2) and the second size (S', S2'), and • a closing element (15, 15', 15"), which is able to be moved between a first position (P) and a second position (P') and is coupled to the second container , wherein, when the store volume of the first container is varied between the first size (S, S2) and the second size (S',S2') by the actuation element , the working fluid is discharged from the store volume or is introduced into the store volume, and consequently the working volume of the second container is varied between the first size (A, A2) and the second size (A', A2') and the second container is deformed, in order to move the closing element (15, 15', 15") between the first position (P) and the second position (P'), and characterized in that the fluid system is formed between two overlapping adjacent foils , and a contour of the containers and of the connecting line(s) is formed by a connection portion at which the two foils are connected to one another. • a fluid system , which has ∘ a first deformable container , which, in a manner dependent on a degree of deformation of the first container, forms a store volume which is able to be varied between a first size (S, S2) and a second size (S', S2'), ∘ a second deformable container , which, in a manner dependent on a degree of deformation of the second container, forms a working volume which is able to be varied between a first size (A, A2) and a second size (A', A2'), ∘ a connecting line , which fluidically connects the first container to the second container , and ∘ a working fluid, which is contained in the fluid system , ∘ a first deformable container , which, in a manner dependent on a degree of deformation of the first container, forms a store volume which is able to be varied between a first size (S, S2) and a second size (S', S2'), ∘ a second deformable container , which, in a manner dependent on a degree of deformation of the second container, forms a working volume which is able to be varied between a first size (A, A2) and a second size (A', A2'), ∘ a connecting line , which fluidically connects the first container to the second container , and ∘ a working fluid, which is contained in the fluid system , • an actuation element , by means of which the first container is able to be selectively deformed in order to vary the store volume between the first size (S, S2) and the second size (S', S2'), and • a closing element (15, 15', 15"), which is able to be moved between a first position (P) and a second position (P') and is coupled to the second container , <EOS>