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The Butterfly Valve is used on the F-15 weapon system. It is part of the F-15 Environmental Control System that regulates bleed air in an engine bleed control sub-system providing air for environmenta... The Butterfly Valve is used on the F-15 weapon system. It is part of the F-15 Environmental Control System that regulates bleed air in an engine bleed control sub-system providing air for environmental control. Please see attached for more information.