US 6,981,514 B2 | ||
Fuel cutoff valve | ||
Hiroshi Nishi, Aichi-ken (Japan) | ||
Assigned to Toyoda Gosei Co., Ltd., Aichi-ken (Japan) | ||
Filed on Mar. 16, 2004, as Appl. No. 10/800,718. | ||
Claims priority of application No. 2003-082931 (JP), filed on Mar. 25, 2003. | ||
Prior Publication US 2004/0187923 A1, Sep. 30, 2004 | ||
Int. Cl. F16K 24/04 (2006.01) |
U.S. Cl. 137—202 | 12 Claims |
1. A fuel cutoff valve that is attached to an upper wall of a fuel tank, and works by a liquid level in the fuel tank, the
fuel cutoff valve comprising:
a casing including (i) a casing main body having a valve chamber connected to the fuel tank, (ii) an external conduit located
outside the fuel tank, and (iii) a first connection conduit formed in an upper portion of the casing main body to connect
the external conduit with the valve chamber,
a first float including (i) a float main body accommodated in the valve chamber, being capable of moving up and down, the
float main body having (i-a) a bottom-open storage chamber, and (i-b) a second connection conduit to connect the first connection
conduit and the storage chamber, an area of the second connection conduit being smaller than that of the first connection
conduit, and (iii) a buoyancy body coupled with the float main body and making a resulting specific gravity of the buoyancy
body and the float main body smaller than a specific gravity of a fuel;
a second float accommodated in the storage chamber, being capable of moving up and down according the liquid level in the
fuel tank to open and close the second connection conduit, a specific gravity of the second float being greater than that
of the fuel, and;
a spring for pressing the second float toward the second connection conduit,
wherein the first float is constructed to move up by buoyancy and thereby close the first connection conduit when the liquid
lever exceeds a first liquid level, and
the second float is constructed to move up by buoyancy and a pressing force of the spring and thereby close the second connection
conduit when the liquid level exceeds a second liquid level higher than the first liquid level, and to move down to open the
second connection conduit when the level drops below the second liquid level but is still above the first liquid level.
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