Overfill protection for fuel tanks
AssigneeW & J Risbridger Limited
InventorGraham M. Stuart
Life of this patent
Estimating the term…
Abstract
A fuel storage tank is disclosed which is fitted with an overfill protection device for automatically shutting off flow of fuel into the tank when the fuel reaches an intended maximum fill level. The overfill protection device comprises a fill valve located in a fuel fill tube and linked to a diaphragm or piston which is displaceable within a chamber, said chamber communicating with an aperture which is arranged to vent the chamber into the tank. The device may include a float valve for controlling the aperture and maintaining the aperture closed until fuel in the tank reaches a predetermined fill level, whereupon the aperture is opened and the piston or diaphragm is displaced to cause closure of the valve.
Claims10
A fuel storage tank (3) having an overfill protection device (OPD) for shutting off flow of fuel into the tank when the amount of fuel in the tank reaches an intended maximum fill level, said OPD including a fill valve (4) located in or connected to a fuel fill tube (5) and linked to a piston or diaphragm (6), which is displaceable in a chamber, said chamber communicating with an aperture (53) which is arranged to vent the chamber into the tank when said aperture is open to cause displacement of the piston or diaphragm and the consequential closure of the fill valve, said aperture being controlled by a vent valve which normally maintains said valve closed, but is linked to fuel level sensing means for sensing when the level of fuel in the tank reaches said intended maximum fill level and causing said vent valve to open.
A storage tank as claimed in 1 wherein the fill valve is linked to a piston which is movable in a cylinder.
Dependencies are inferred from the claim text.