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2. Check valve - Wikipedia

   en.wikipedia.org/wiki/Check_valve

   A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. [1] Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various ...

3. Baikal Airlines Flight 130 - Wikipedia

   en.wikipedia.org/wiki/Baikal_Airlines_Flight_130

   The flight crews at the time didn't think that the alarm was an emergency, as they thought that the design of the Tupolev Tu-154 would not have made it possible to happen. The previous predecessor of the Tu-154M variant was equipped with a check valve, which would shut off the supply of air to the engine starter.

4. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   Choke valve, Butterfly valve used to limit air intake in internal combustion engine. (Not to be confused with choke valves used in industrial flow control, above.) Clapper valve: a type of check valve used in the Siamese fire appliance to allow only one hose to be connected instead of two (the clapper valve blocks the other side from leaking out)

5. United Airlines Flight 585 - Wikipedia

   en.wikipedia.org/wiki/United_Airlines_Flight_585

   United Airlines Flight 585 was a scheduled passenger flight on March 3, 1991, from Denver to Colorado Springs, Colorado, carrying 20 passengers and 5 crew members on board. The plane experienced a rudder hardover while on final approach to runway 35 at Colorado Springs Municipal Airport , causing the plane to roll over and enter an uncontrolled ...

6. Double check valve - Wikipedia

   en.wikipedia.org/wiki/Double_check_valve

   A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest pressure source. It ...

7. ValuJet Airlines - Wikipedia

   en.wikipedia.org/wiki/ValuJet_Airlines

   ValuJet Airlines was an ultra low-cost airline in the United States that operated from 1992 until 1997, when it was rebranded as AirTran Airlines after joining forces with AirTran Airways. It was headquartered in unincorporated Clayton County, Georgia [ 2 ] and operated regularly scheduled domestic and international flights in the Eastern ...