OIL-LESS PRESSURE RELIEF VALVES

摘要

A self contained one-way pressure relief valve for application to product packaging that does not require the addition of a sealing lubricant. Atop a base with an opening extending through the base is an adhesive-like material layer, and a dry strap of a silicone or other release film coated membrane, all of which are of gas impervious materials. The release film coated material layer covers the opening with the release film in contact with the adhesive-like material creating a surface attraction between the release film and the adhesive-like material. An intermediate layer of gas impervious material with an opening extending through such layer may be provided. A gas pervious filter material layer may be provided to block passage of fine particulates or liquid.

主权项

1. A one-way pressure relief valve for application to a closed package having an exterior surface and a gas-producing product therein, the valve comprising:
a gas-impervious base layer having an outer edge, a top, a bottom, adhesive on the bottom for affixing the valve to the package exterior surface and a gas-flow opening extending entirely through the base layer from the bottom to the top; a gas-impervious flexible cover over the base layer and the gas-flow opening; and a pair of contacting and separable gas-impervious layers, one of the separable layers being associated with the base layer completely around the gas-flow opening and the other of the separable layers being associated with the flexible cover completely covering the gas-flow opening, the separable layers being of materials having material properties which keep the separable layers in contact to block passage of gas therebetween until a force from gas entering the gas-flow opening separates the layer associated with the flexible cover from the layer associated with the base layer sufficiently to allow the gas to flow between the separable layers, to the outer edge of the base layer, and out of the valve.