A flexible tube check valve is introduced within a fluid path for leakage protection from flexible liquid containers. The flexible check valve can be a crossbill valve comprising multiple flexible members that restrict the flow of fluid in a tubular member. The flexible check valve is preferably functionally...http://www.google.fr/patents/US20070108158?utm_source=gb-gplus-shareBrevet US20070108158 - NO STRAW LIQUID POUCH
