Patent ID: 8220481

Claim:
A fuel shutoff valve being mounted on the top of fuel tank, and opening and closing a connector passage that connects the inside of the fuel tank to the outside, thereby communicating the inside of the fuel tank with the outside and shutting off the inside of the fuel tank from the outside, the fuel shutoff valve comprising: a valve chamber for communicating the connector passage with the inside of the fuel tank; a casing comprising a body for forming the valve chamber, a cylinder being disposed on an upper side of the body and protruding into the valve chamber to form the connector passage, and a seal being disposed at a lower end of the cylinder; a float being accommodated in the valve chamber, comprising an engager, and ascending and descending within the valve chamber, depending on a buoyant force that results from a liquid-fuel level within the valve chamber to exert on the float; and a shock absorber being disposed between the seal of the casing and the float, comprising an engagee that engages with the engager of the float when the float descends at least, and a seat that attaches to and detaches from the seal of the casing, and the shock absorber ascending and descending along with the float within the valve chamber to attach and detach the seat to and from the seal, thereby closing and opening the connector passage; the shock absorber further comprising: the seat being disposed at a diametrically central part of the shock absorber; the engagee being disposed on a diametrically outer side of the seat; a first arm protruding toward a diametrically outer side of the seat, and exhibiting elasticity; a second arm protruding from one of the first arm and the seat, having a leading end that makes a free end, and exhibiting elasticity; a contact being disposed at the leading end of the second arm, and coming in contact with the ascending float; and a locker being disposed at a diametrically-outer-side leading end of the first arm, and locking to the body of the casing when the shock absorber is positioned at the lowermost level in the valve chamber.