Valve, and package

Abstract

A pressure-relief valve includes a cup shaped main body with a bottom and a circumferential wall to be fastened to a flexible package material. The bottom has at least one through hole forming a passage through the main body. A valve membrane lies against the main body on a package side in a region around the through hole(s), with a sealing liquid between the main body and the valve membrane. The valve membrane thereby covers the at least one through hole. The circumferential wall has, on its outside, a plurality of indentations.

1 . Pressure-relief valve, the valve comprising a cup shaped main body, with a bottom and a circumferential wall, equipped to be fastened to a flexible package material, the bottom having at least one through hole forming a passage through the main body, a valve membrane lying against the main body on a package side in a region around the at least one through hole, and a sealing liquid between the main body and the valve membrane membrane, wherein the circumferential wall has, on its outer surface, a plurality of indentations. 
     
     
         2 . The valve according to  claim 1 , wherein the indentations are arranged equally distributed around the outside of the circumferential wall. 
     
     
         3 . The valve according to  claim 1 , wherein the indentations are axially running grooves extending from a product-side end of the main body, with ribs between the grooves. 
     
     
         4 . The valve according to  claim 1 , wherein the outer surface of the circumferential wall, with the exception of the indentations, is cylindrical or slightly conical. 
     
     
         5 . The valve according to  claim 1 , wherein the circumferential wall comprises, on a package-side end face, an energy directing circumferential rib. 
     
     
         6 . The valve according to  claim 1 , wherein the circumferential wall comprises, on the package-side end, an outwardly protruding flange. 
     
     
         7 . The valve according to  claim 1 , wherein the outer surface of the circumferential wall has a structured section with the indentations and further has a smooth section axially spaced from the structured section. 
     
     
         8 . The valve according to  claim 1 , wherein at least one component of the valve is made of a polymer composition comprising a water-soluble polymer. 
     
     
         9 . The valve according to  claim 1 , being bio-degradable. 
     
     
         10 . The valve according to  claim 1 , further comprising a permeable membrane being a fabric secured to the main body to cover the at least one through hole on a product side opposite the package side. 
     
     
         11 . The valve according to  claim 1 , wherein the main body has a system of ventilation grooves, with spacers between them, the mouth of the through hole or the at least one of the through holes being in a ventilation groove. 
     
     
         12 . The valve according to  claim 1 , further comprising a fixing part fixed relative to the circumferential wall so that the valve membrane is sandwiched between the bottom and the fixing part. 
     
     
         13 . A package for packaging food products, the package comprising a flexible, pliant packaging material as well as a pressure relief valve according to  claim 1 , wherein the main body is attached to the packaging material.