A release valve is disclosed which in one embodiment includes a housing having a passageway extending therethrough and defining an inlet and an outlet, and a membrane extending across the passageway between the inlet and the outlet. The membrane is operable to permit passage through the passageway of...http://www.google.de/patents/US20020160245?utm_source=gb-gplus-sharePatent US20020160245 - Release valve and method for venting a system
