Fuel cutoff valve and production method thereof

A fuel cutoff valve mountable on an upper tank wall of a fuel tank, the fuel cutoff valve comprising:

• a cover made of a first resin material that is thermally weldable to the upper tank wall, the cover including a welding end thermally weldable to the upper tank wall;
• a casing made of a second resin material different from the first resin material, the casing including an upper portion and a valve chest that is able to communicate with the fuel tank and at least a portion of a fuel conduit forming a passage from the fuel tank to the outside of the fuel cutoff valve;
• a valve body accommodated in the valve chest to open and close the fuel conduit;
• wherein the cover has a plurality of sealing ribs and a stopper formation, the sealing ribs projecting substantially vertically towards the casing, the stopper formation forming a substantially horizontal step at substantially right angles to the sealing ribs;
• and
• wherein the casing is unified with the cover by overmolding to embed the sealing ribs and the stopper formation in the casing.

A process for manufacturing a fuel cutoff valve mountable on an upper tank wall of a fuel tank, the process comprising:

• forming a casing from a resin material including forming a plurality of sealing ribs and a stopper formation, the sealing ribs projecting outward and the stopper formation forming a substantially horizontal step that extends at substantially right angles to the sealing ribs;
• setting the casing in a cavity of a mold;
• and
• forming a cover that is thermally weldable to the upper tank wall from a different resin material than the resin material of the casing by injecting the different resin material into the cavity to enclose the sealing ribs and stopper formation, thereby integrally molding the cover with the upper portion of the casing.