Its function was to expel the air that came inside the cylinder along with the steam to prevent the engine to become "wind logged". Since the valve was non-return, how did Newcomen stopped steam from leaving after pushing out the air?

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    $\begingroup$ I think this should migrate to Engineering.SE since it's not an historical question. $\endgroup$ – Carl Witthoft Sep 26 '17 at 11:28

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