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.

Abstract: An air transfer valve is disclosed comprising a housing (8) having an inlet (21) and an outlet (22), the outlet being controlled by a first non-return, valve (28) which is biased to its closed position and the outlet being controlled by a second valve (30) which is normally in its open position, the first valve being caused to open by an increase in air pressure within the valve but closing in response to reduced pressure. The valve is intended to be fitted into a fill pipe (1) of a fuel storage tank so that the outlet communicate with the tank ullage through an aligned hole in the wall of the fill pipe. In this situation, the valve transfers air from the fill pipe into the ullage and reduces turbulence which would otherwise cause excessive generation of vapor during tank filling (FIG. 1).