| 摘要 |
The present invention relates to a safety valve modified to block the flow in two directions within a flow passage to be closed by the pressure difference between a first end and a second end. The safety valve comprises: the flow passage including the first end (40) and the second end (42); and an interruption means (18) for reducing the flow of the flow passage. The interruption means (18) is arranged to be moved between a first position (20) and a second position (22) depending on the influence of the pressure difference between the first end (40) and the second end (42) of the flow passage. When the interruption means (18) is located at the first position (20) and the second position (22) instead of at the center of the interval between the first position (20) and the second position (22), the flow of the flow passage is remarkably reduced. The position of the interruption means (18) is specified depending on the flow of the flow passage. The safety valve controls the flow of the flow passage using pressure reduction. |
