+ Visit NASA.gov + Contact NASA   + Home Select Search Field * All Report - Patent Number Abstract *Accession Number *NASA Center *Author NameDocument IDKeywordsPublication Date *Title * Find Results With All of the words At least one of the words Enter Search Term  within returned results    Search Tips: Use only the fields with * to search NIX collection. Enclose terms in double quotation marks (") to search for exact phrases, ie: "space shuttle". NOTE: Commas and dashes are removed from search term by search engine. Select Reset Search button to start a new search. See Help for more tips. Selected Navigations: Author > Fournier, Walter L. [x] Sort results by: NASA Center | Date Added to NTRS | Publication Year There are a total of 1 record(s) matching your query. Sorted by: Date Added To NTRS in Descending order Lightweight Valve Closes Duct Quickly Author(s): Fournier, Walter L.; Burgy, N. Frank Abstract: Expanding balloon serves as lightweight emergency valve to close wide duct. Uninflated balloon stored in housing of duct. Pad resting on burst diaphragm protects balloon from hot gases in duct. Once control system triggers ... NASA Center: Marshall Space Flight Center Publication Year: 1991 Added to NTRS: 2005-09-30 Accession Number: 91B10663; Document ID: 19910000663; Report Number: MFS-28511 + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007