Closure device for a vessel holding an operating medium

Abstract

A closure device for a vessel for holding an operating medium includes a tank closure (2) and a tank stub (1). The tank stub (1) defines a fill opening having a sealing surface (16) disposed therearound. The tank closure (2) includes an outer part (6) and an inner part (8) which are limitedly movable toward one another in the axial direction of the tank stub (1). The inner part (8) does not rotate but is guided axially displaceably in the tank stub (1) and the outer part (6) is rotatable relative to the inner part (8) on the tank stub (1) so as to be fix-tightly screwable thereon. A spring (26) is provided between the outer part (6) and the inner part (8). The spring biases the inner part (8) against the sealing surface (16) on the tank stub (1).

Dependencies are inferred from the claim text.