Patent ID: 8356619

Claim:
A non-return valve intended to be joined to a container intended for air or liquids, comprising: an opening channel in a non-rigid plastic or rubber material forming the non-return valve; and a resilient device on a flat outside of the non-return valve in a shape of a thin resilient sheet material, which extends along the opening channel and is fastenedly received in a deflected arch on each side of the opening channel in order to spread the material of the opening channel laterally, wherein the resilient sheet material is fixed under the plastic or rubber material, which is welded along outer sides of the opening channel and which thereby forms a holder for the resilient sheet material, which is arranged to be deflected and threaded in between one of the material of the opening channel and the material of the holder, and the resilient sheet material has projections along side edges facing away from each other for retention.