Automatic closure for elastically deformable containers

An automatic closure for an elastically deformable container having a dispensing neck for pasty or liquid media, comprising:

• a housing for attachment to the dispensing neck;
• a hood cover with a front wall defining a dispensing opening;
• a stopper closing member movable in the axial direction for closing an inside of the dispensing opening, the hood cover being arranged on said housing, said closing member comprising an elastic membrane wall with a hollow body of an elastic material as a whole and includes a substantially cylindrical wall section;
• an inner ring wall section with a chamber which is closed by a bottom surface, said substantially cylindrical wall section surrounding said inner ring wall section, said chamber being arranged within a hollow space of the housing, though which hollow space the media flows, and said chamber being connected to the environment through at least one ventilating channel, said at least one ventilating channel being arranged in a radial web, said radial web and connecting said inner ring wall to said housing;
• a second ring wall, said inner ring wall being surrounded by said second ring wall to form an annular groove with the inner ring wall, said annular groove having at least one axial ventilating opening connecting said ventilating charmel to said hollow space surrounded by said second ring wall, said substantially cylindrical wall section of said hollow body having an elastic lip separating said at least one ventilating opening from the hollow space, functioning as a on-way valve.