Patent ID: 8371326
Filing Date: 2013-02-12
Classification: F16K,Y10T

Abstract:
1. A fuel vapor vent valve assembly for a fuel tank, the fuel vapor vent valve assembly comprising: a housing including an outlet and defining an interior opening in fluid communication with the outlet; a liquid/vapor discriminator coupled to the housing and movable between an open position and a closed position, wherein the liquid/vapor discriminator allows fluid communication between an interior of the fuel tank and the interior opening of the housing in the open position, and the liquid/vapor discriminator prevents fluid communication between the interior of the fuel tank and the interior opening of the housing in the closed position; and an anti-trickle valve disposed within the interior opening of the housing to open and close fluid communication between the interior opening of the housing and the liquid/vapor discriminator to selectively allow fluid communication between the interior opening of the housing and the interior of the fuel tank when the liquid/vapor discriminator is in the open position; wherein the anti-trickle valve includes: wherein the casing defines an upper vacuum relief vapor passage and a lower vacuum relief vapor passage, with the upper vacuum relief vapor passage configured for communicating vapor between the interior opening of the housing and the second cavity, and the lower vacuum relief vapor passage configured for communicating vapor between the second cavity and the liquid/vapor discriminator; and wherein the vacuum relief mechanism includes a float disposed within the second cavity, wherein the float is configured to seal against the upper vacuum relief vapor passage in response to a vapor pressure from within the fuel tank that exceeds a selected vacuum level to close fluid communication between the upper vacuum relief vapor passage and the lower vacuum relief vapor passage, and wherein the float is configured to withdraw from sealing engagement with the upper vacuum relief vapor passage in response to a vacuum pressure from within the fuel tank that is less than the selected vacuum level to open fluid communication between the upper vacuum relief vapor passage and the lower vacuum relief vapor passage.