초록 ▼

A vapor recovery fuel system includes a fuel tank having at least one vent opening defined therein. A fuel vapor canister is in communication with the vent opening to receive and filter fuel vapors from the tank. A refueling control valve is configured in the vent opening and has a first inlet orifi

A vapor recovery fuel system includes a fuel tank having at least one vent opening defined therein. A fuel vapor canister is in communication with the vent opening to receive and filter fuel vapors from the tank. A refueling control valve is configured in the vent opening and has a first inlet orifice and an outlet in communication with the vapor trap. The control valve includes a variably buoyant first float body extending into an interior of the fuel tank which rises over a predetermined range of movement in response to increasing fuel level. The control valve includes a second float body engaged by the first float body over at least a portion of its range of movement. The first float body has a buoyancy during refueling so as to rise with increasing fuel level to engage and move the second float body into a sealing position to seal the inlet orifice from the outlet at a predetermined height of fuel within the tank. The first float body has a buoyancy reducing mechanism for automatically reducing its buoyancy after refueling so that it lowers in the fuel tank thereby allowing the second buoyant body to lower and unseal the inlet orifice after refueling.

대표청구항 ▼

[ What is claimed is:] [1.] A vapor recovery fuel system, comprising:a fuel tank having at least one vent opening defined therein;a fuel vapor trap in communication with said vent opening to receive fuel vapors from said fuel tank; anda refueling control valve configured with said vent opening, said

[ What is claimed is:] [1.] A vapor recovery fuel system, comprising:a fuel tank having at least one vent opening defined therein;a fuel vapor trap in communication with said vent opening to receive fuel vapors from said fuel tank; anda refueling control valve configured with said vent opening, said control valve having a first inlet and an outlet in communication with said vapor trap, said control valve comprising a variably buoyant first float body extending into an interior volume of said fuel tank which rises over a predetermined range of movement in response to increasing fuel level in said fuel tank during refueling, said control valve further comprising a second float body movable relative to said first float body and engaged by said first float body over at least a portion of said range of movement, said first float body having a buoyancy during refueling so as to rise with increasing fuel level and engage and move said second float body into a sealing position to seal said inlet from said outlet at a predetermined height of fuel within said fuel tank, said first float body having a buoyancy reducing mechanism for automatically reducing its buoyancy after refueling so that it lowers in said fuel tank allowing said second float body to lower and unseal said inlet after refueling.