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[i]After examining the problematic engine, SpaceX engineers were able to trace the high-pressure problem to a valve that controls the flow of nitrogen used to purge the engine before ignition. Using the inert nitrogen gas to purge rocket engines is common and has been used for decades. The nitrogen displaces gases and/or liquids, effectively cleaning the engine and preventing any volatile mixtures before ignition. A check valve that allows the nitrogen purge prior to ignition in the Merlin engine was stuck open just before launch. This stuck valve allowed "liquid oxygen to flow from the main injector [for the rocket engine itself] into the gas generator injector" that generates hot turbine gas, which drives the turbopumps, according to SpaceX.[/i]
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