Tank system

Abstract

The invention relates to a tank system and a closure, comprising a base portion and a membrane portion, wherein the base portion has a jacket-shaped wall portion and a transition region adjacent thereto, wherein the membrane portion is adjacent to the transition region and protrudes from the transition region along a central axis, wherein the membrane portion is designed to be brought into a blocking state or into a passage state, wherein the membrane portion is substantially fluid-impermeable in the blocking state, and wherein the membrane portion is fluid-permeable along the central axis in the passage state.

1 . Closure, in particular for use in a tank,
 comprising a base portion and a membrane portion,   wherein the base portion has a jacket-shaped wall portion and a transition region adjacent thereto,   wherein the membrane portion is adjacent to the transition region and protrudes from the transition region along a central axis,   wherein the membrane portion is designed to be brought into a blocking state or into a passage state,   wherein the membrane portion is substantially fluid-impermeable in the blocking state, and   wherein the membrane portion is fluid-permeable along the central axis in the passage state.   
     
     
         2 . Closure according to  claim 1 ,
 wherein the wall portion is substantially axially symmetrical and/or rotationally symmetrical about the central axis and preferably has a circular cross section.   
     
     
         3 . Closure according to  claim 1 ,
 wherein at least the membrane portion is formed from an elastically deformable material having a Shore hardness of 20 to 90 Shore A, preferably 50 to 70 Shore A.   
     
     
         4 . Closure according to  claim 1 ,
 wherein the membrane portion has a first membrane wall and a second membrane wall opposite the first membrane wall,   wherein the first and second membrane walls in the blocking state lie against each other substantially over their entire surface, and   wherein in the passage state a gap is formed between the first membrane wall and the second membrane wall and is fluid-permeable along or parallel to the central axis.   
     
     
         5 . Closure according to  claim 1 ,
 wherein the membrane portion, at least in the blocking state, has a substantially flat and planar extent parallel to a gap plane, wherein the central axis lies in the gap plane.   
     
     
         6 . Closure according to  claim 1 ,
 wherein the base portion is pot-shaped and is open at its end facing away from the transition region.   
     
     
         7 . Closure according to  claim 1 ,
 wherein an overpressure in the main body compared to the pressure at a distal end of the membrane portion puts the membrane portion into the passage state such that a fluid can flow from the base portion toward the distal end,   wherein the overpressure is preferably in the range from 50 Pa to 600 Pa, particularly preferably from 90 Pa to 400 Pa.   
     
     
         8 . Closure according to  claim 1 ,
 wherein the base portion has a collar which has a greater extent orthogonal to the central axis than the wall portion.   
     
     
         9 . Closure according to  claim 1 ,
 wherein the membrane portion has a maximum membrane length measured parallel to the central axis,   wherein the membrane portion has a maximum membrane width measured orthogonal to the central axis,   wherein the membrane length is in a ratio of preferably 0.7 to 2, particularly preferably 0.9 to 1.5 to the membrane width.   
     
     
         10 . Tank system, in particular tank system of a motorhome or caravan, comprising a tank and a riser pipe which extends at least partially inside the tank,
 wherein in or at a first end region of the riser pipe a closure according to  claim 1  is fixed, such that the riser pipe is sealed by the closure, wherein the riser pipe opens into the environment at a second end region.