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How many outflow valves, positive press relief valve and negative press relief valve in the B777?

April 26, 2017negative Outflow positive Press relief valve valves

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How many outflow valves, positive press relief valve and negative press relief valve in the B777?

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Two outflow valves: to regulate the cabin pressurization. Two positive pressure relief valves: to prevent over-pressure (air inside the cabin is high) Four negative pressure relief valve: to prevent under-pressure (air inside the cabin is low).