| 摘要 |
Several forms of valve assembly, to be secured permanently to a container, enable one-time-only filling of the container, for avoiding dangerously refilled containers. The valve assembly has a shut-off valve for controlling fluid dispensing. In some forms, the shut-off valve converts the assembly to its non-fillable condition as a consequence of the first closing operation of the shut-off valve. There may be an initially inactive check valve that allows the container to be filled and becomes a discharge-only check valve, or a check valve in a dispensing passage may have a parallel filling passage that is blocked after one use.
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