Fuel cutoff valve

摘要

A fuel cutoff valve comprises a casing having a primary valve chamber and a secondary valve chamber, a primary valve mechanism housed in the primary valve chamber, and a secondary valve mechanism housed in the secondary valve chamber. The casing has a first communication path that connects the inside of the fuel tank and the primary valve chamber, and a second communication path that connects the primary valve chamber and the secondary valve chamber, due to the differential pressure between the tank internal pressure and the primary valve chamber, by the fuel in the fuel tank flowing into the primary valve chamber through the first communication path, a connection conduit is closed by the primary valve mechanism. When the fuel level inside the fuel tank reaches a second fuel level, the second communication path is closed by the rising of the secondary valve mechanism.

主权项

1. A fuel cutoff valve that opens and closes a connection conduit connecting a fuel tank and the outside, the fuel cutoff valve comprising:
a casing that includes a primary valve chamber connected to the connection conduit, and a secondary valve chamber disposed under the primary valve chamber; a primary valve mechanism that is housed in the primary valve chamber, that rises and falls according to a fuel level in the primary valve chamber, and that is configured to rise when the fuel level inside the primary valve chamber reaches a first predetermined level; and a secondary valve mechanism that is housed in the secondary valve chamber and rises and falls according to a fuel level in the secondary valve chamber, wherein the casing includes a first communication path connecting the fuel tank and the primary valve chamber, and a second communication path connecting the primary valve chamber and the secondary valve chamber, wherein the first communication path is an elongated tube, the casing and the primary valve mechanism are configured such that the primary valve mechanism closes the connection conduit by the fuel in the fuel tank entering the primary valve chamber through the first communication path due to a differential pressure between an internal pressure of the tank and a pressure of the primary valve chamber when the fuel level in the fuel tank reaches a first fuel level, and the casing and the secondary valve mechanism are configured such that the secondary valve mechanism closes the second communication path when the fuel level in the fuel tank reaches a second fuel level as same as the first fuel level or higher than the first fuel level.