Patent ID: 8608021

Claim:
A fill cover assembly for a liquid fuel storage tank of a road tanker, the assembly comprising: a base plate; a seat member having a frame, the frame defining a fill aperture, the frame configured to be fixedly coupled to the base plate of a liquid storage tank, the base plate having a plate aperture formed therein; and a fill-cover coupled to the frame and arranged to be moveable with respect to the frame between a closed condition and an open condition; wherein in the closed condition, a fluid tight seal is formed between the fill cover and the seat member whereby there is no venting of pressurized fluid from the liquid storage tank when a pressure of the fluid is below a prescribed value, and in the open condition, fluid may be passed through said fill aperture to fill said storage tank; wherein the frame of the seat member is in the form of an insert member having a flange portion with a peripheral face arranged to abut a portion of a face of the base plate around a periphery of the plate aperture and a lip portion arranged to project from the flange portion through the plate aperture; wherein the lip portion is configured to abut an edge of the wall member defining the plate aperture so that the flange portion forms a fluid tight seal between the seat member and the base plate of the liquid storage tank around said plate aperture; wherein the base plate is arranged to be coupled to a liquid storage tank having an access aperture formed therein and forms a fluid tight seal around the access aperture; and wherein the assembly is further arranged to allow venting of pressurized fluid from the liquid storage tank in the even that a pressure of the fluid exceeds said prescribed value when the fill cover is in a closed condition.