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US 8,047,393 B2Granted
Tank filler neck with a negative and positive pressure relief valve
AssigneeMAGNA STEYR Fuel Systems GesmbH
InventorStefan Feichtinger
Life of this patent
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AssigneeMAGNA STEYR Fuel Systems GesmbH
InventorStefan Feichtinger
Estimating the term…
A tank filler neck comprises an outer wall (1), an inner wall (2) and an inner space (19) closed off from the environment during operation. In order to enable the pressure in this space (19) to be equalized in both directions, a negative and positive pressure relief valve (20) is provided in the annular space (18) between outer wall (1) and inner wall (2). The valve comprises a partition (21) with holes (30) distributed over the circumference, said partition dividing the annular space (18) between outer wall (1) and inner wall (2) into a first annular space (22) connected to the atmosphere and a second annular space (23) connected to the inner space (19), a first valve ring (31) in the first annular space (22) and a second valve ring (32) in the second annular space (23), which valve rings have first zones (40, 42) and second offset zones (41, 43) alternating in the circumferential direction, see FIG. 4.
Tank filler neck comprises an outer wall (1) and a concentric and cylindric inner wall (2) and, in its interior, forms a space (19) which is closed in relation to the environment during operation and is opened for refueling, wherein a single combined valve which acts as a negative and positive pressure relief valve is provided for equalizing the pressure when the space (19) is closed, the single combined negative and positive pressure relief valve (20) is arranged in an annular space (18) formed between the outer wall (1) and the inner wall (2) and the single combined valve surrounds the entire inner wall, which single combined valve (20) is firstly connected to the space (19) and secondly to the atmosphere and opens in the one or other direction in order to reduce a pressure differential between the space (19) and the atmosphere.
Dependencies are inferred from the claim text.