| 摘要 |
A valve unit installed in the pipeline equipped with double tubes. A valve body has an inlet passage, an outlet passage and a valve chamber. An inner tube of an inlet double tube is welded to the inlet passage of the inlet double tube, and an outer tube of the inlet double tube is secured to the valve body. The outlet double tube is also attached to the valve body. A cover is welded to the valve body, the inlet double tube and the outlet double tube. Passages are provided for leading leaked gas from the valve chamber to conduits formed between the outer tube and the inner tube of the inlet double tube and the outlet double tube.
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