Self-closing valve

Abstract

The invention relates to a self-closing valve for dispensing a free-flowing product. The valve has a valve membrane with an opening for dispensing and an encircling edge at the outer perimeter, wherein the valve membrane is able to switch between a closed mode, a dispensing mode, and a back suction mode due to pressure differences produced. There is also a stopper on which the valve membrane lies in the closed mode and in the back suction mode so that the dispensing opening is closed, and from which it is lifted in the dispensing mode. The valve includes a stop ring, on which the encircling edge of the valve membrane lies as a seal during the closed mode and from which it is lifted in the back suction mode, and a lateral channel that extends axially, wherein at least parts of the encircling edge are opposite the valve membrane, and the encircling edge is movable axially on the lateral channel to switch to back suction mode, in which a gap is created between the encircling edge and the lateral channel.

1 . Self-closing valve for dispensing a free-flowing product, comprising:
 a valve membrane, which has the shape of a disk spring, with an opening for dispensing and a level encircling edge at the outer perimeter, wherein the valve membrane is able to switch between a closed mode, a dispensing mode, and a back suction mode due to pressure differences produced;   a stop disk lying transversely to the axis of symmetry of the valve, with a bearing surface, on which the valve membrane lies in the closed mode and in the back suction mode so that the dispensing opening is closed, and from which it is lifted in the dispensing mode;   a stop ring, on which the encircling edge of the valve membrane lies as a seal during the closed mode and from which it is lifted in the back suction mode;   a lateral guide that extends axially, and at least parts of the encircling edge of the valve membrane are opposite it at the periphery, while the encircling edge can move axially on the lateral guide to switch to the back suction mode, in which a gap is created between the encircling edge and the lateral guide; wherein the valve membrane shaped as a disk spring is cambered in the closed position in the direction of the stop disk and in the dispensing position it has a cambering inverted relative to the closed position.   
     
     
         2 . The self-closing valve according to  claim 1 , wherein the valve membrane and the dispensing opening are circular and concentric in configuration. 
     
     
         3 . The self-closing valve according to  claim 2 , wherein the stop disk has a pin with an envelope surface in the shape of a truncated cone, and the pin projects into the dispensing opening in the closed position. 
     
     
         4 . The self-closing valve according to  claim 3 , wherein the dispensing opening has a sealing lip at its periphery, and at least parts of the inner surface of the sealing lip conform to the truncated cone shape of the pin. 
     
     
         5 . (canceled) 
     
     
         6 . (canceled) 
     
     
         7 . The self-closing valve according to  claim 1 , wherein the valve membrane is made from a silicone plastic or a thermoplastic elastomer. 
     
     
         8 . The self-closing valve according to  claim 1 , wherein the stop, the stop ring and the lateral guide are made as a single piece. 
     
     
         9 . The self-closing valve per according to  claim 8 , wherein the stop disk, the stop ring and the lateral guide are made as a single piece with an outer fastening frame, which can be fastened in the bottle neck opening of a squeeze bottle. 
     
     
         10 . The self-closing valve according to  claim 8 , wherein the stop disk, the stop ring and the lateral guide and the outer fastening frame are made as a single piece with a container in which the free-flowing product is kept. 
     
     
         11 . The self-closing valve according to  claim 1 , wherein further support means are provided on the stop, on which the valve membrane rests by segments in the closed position. 
     
     
         12 . The self-closing valve according to  claim 1 , wherein stiffening means are provided on the valve membrane. 
     
     
         13 . The self-closing valve according to  claim 12 , wherein the stiffening means are arranged between the bearing surface and the encircling edge. 
     
     
         14 . The self-closing valve according to  claim 1 , wherein contouring means are provided on the valve membrane, which project into the dispensing opening and/or are arranged in the wall of the dispensing opening.