US Patent 6851255 Normally open reverse flow flapper valve
Patent 6851255 was granted and assigned to Pratt & Whitney Canada on February, 2005 by the United States Patent and Trademark Office.
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Patent abstract
A fluid flow actuated valve for controlling the fluid flow in a conduit comprises a support structure adapted to be mounted within the conduit and at least one flap member pivotally mounted to the support structure. The at least one flap member is pivotable between an first position for a minimum fluid flow and a second position for a maximum fluid flow. A torsion spring is attached to the at least one flap member to urge the same to pivot against a fluid pressure differential, from the first position to the second position when the fluid pressure differential is smaller than a predetermined level.
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Patent Inventor Names
Henry Smith0
Patrick David Germain0
Paul Archibald Aitchison0
Date of Patent
February 8, 2005
0Patent Application Number
103215210
Date Filed
December 18, 2002
0Patent Primary Examiner
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US Patent 6851255 Normally open reverse flow flapper valve
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