Patent ID: 8215103
Filing Date: 2012-07-10
Classification: F01N,F16K

Abstract:
1. An exhaust pressure actuated valve assembly for placement inside a tubular exhaust conduit, the valve assembly comprising: a valve flap having first and second arcuate edges conforming to and in contact with curved portions of the exhaust conduit, and first and second linear edges extending between the first and second arcuate edges and providing clearance between the valve flap and an inner surface of the conduit when the valve flap is in a fully closed position; an axle adapted to pivotally couple the valve flap to the exhaust conduit about a longitudinal axis of the axle, the axle coupled to the valve flap between the first and second arcuate edges such that unequal surface areas of the valve flap lie on either side of the axle, the axle including a protrusion at one end thereof adapted to be positioned exteriorly of the exhaust conduit; and a bias element adapted to be coupled between the exhaust conduit and the axle protrusion, the bias element operative to urge the valve flap toward a closed position wherein the first and second arcuate edges of the valve flap contact curved portions of the exhaust conduit; wherein exhaust pressure of a magnitude overriding a bias force of the bias element forces the valve flap to a full open position within the conduit wherein the first and second linear edges of the valve flap contact an inner surface of the valve conduit and are parallel to a longitudinal axis of the conduit.