| 摘要 |
A tank filler neck which ha& 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). Said 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.
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