PACKING CONTAINER VALVE (VERSIONS) Russian patent published in 2003 - IPC

FIELD: packing. SUBSTANCE: invention is designed for use in packing containers, especially, in thin-walls plastic bottles for dispensing liquids, such as tomato sauces, washing liquids, etc. Proposed valve has head concave from outside and connected with outer edge by means of flexible connecting wall. Connecting wall id provided with outer section in from of truncated cone and cylindrical inner section connected with outer section by knee. Inner section is connected with valve head by thin flange turned inwards. Outer section of connecting wall is made in form of truncated cone and it can be displaced between tilted downwards and tilted upwards positions when valve is pushed out for pouring out the contents. Such design provides bistable operating characteristic of valve. Knee of connecting wall acts as spring for quick pulling in of valve after pouring out of product. Flange operates as movable joint without bending resistance so that subsequent deformation of valve head does not preclude ventilation. EFFECT: prevention of crumpling of bottle walls at re-closing of bottle. 15 cl, 15 dwg