[T3] breather flapper valve

[Edward Morris <zpctnlj@yahoo.com>]

If I'm interpreting this correctly - 

at some point there will a large enough pressure diff
between the the crankcase and atmosphere to overcome
the butterfly's attached 'counterweight' ?  Does this
work as engineered or are there practical
alternatives?  As always - thanks for your help. 
Edward

butterfly closed:

http://members.cox.net/witfir/breatherclosed.jpg

counterweight:

http://members.cox.net/witfir/breathercounterweight.jpg

butterfly open:

http://members.cox.net/witfir/breatheropen.jpg


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