Patent ID: 8360088
Filing Date: 2013-01-29
Classification: F16K,Y10T

Abstract:
1. A fuel cutoff valve attached to an upper portion of a fuel tank and configured to open and close a connection conduit for connecting the fuel tank with outside by down and up motions of a float and thereby connect and disconnect the fuel tank with and from the outside, the fuel cutoff valve comprising: a cover member welded to an upper wall face of the fuel tank; and a easing fastened to the cover member and having a valve chest for connecting the fuel tank with the connection conduit, the valve chest receiving the float therein, wherein the casing has a bottomed recess with a concave shape arranged in an outer circumferential wall of the valve chest, and the casing has a vent hole formed in a bottom area of the bottomed recess that is configured to ventilate the valve chest to the fuel tank, the vent hole having a smaller diameter than a diameter of the bottom area of the bottomed recess, the bottom area of the bottomed recess includes a vent hole surrounding site surrounding the vent hole and a recess inner circumferential wall site around the vent hole surrounding site, and the recess inner circumferential wall site has a wall thickness less than a wall thickness of the vent hole surrounding site.