Patent ID: 7571740

Claim:
A cut off valve that opens and closes a connection conduit for connecting a fuel tank to a location exterior to the fuel tank, the cut off valve comprising: a casing that includes a valve chamber that is constructed and arranged to connect the fuel tank to the connection conduit; a float mechanism that is accommodated in the valve chamber to open and close the connection conduit according to a level of a liquid fuel in the fuel tank; and a spring that presses the float mechanism in a closing direction, wherein the float mechanism includes (i) a first float body that has a valve portion, which opens and closes the connection conduit, a storage chamber, which is opened downwardly, a spring support, which supports an end of the spring, and a vent, which is formed through an upper portion of the first float body, wherein the vent connects the storage chamber with an outside space of the float mechanism; and (ii) a second float body that is received in the storage chamber to be joined with the first float body, wherein the second float body includes an engaging claw that engages with the vent and joins the first float body and the second float body, wherein the float mechanism includes a spring storage space for receiving the spring, and wherein the spring storage space is formed between an inner wall of the storage chamber and an outer circumference of the second float body and is connected with the vent.