| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of stress or the leakage of internal liquid by causing a through-bolt for fastening a easing to follow up even the thermal expansion/shrinking of the easing accompanying the sudden increase/decrease of the temperature of liquid inside a multistage pump. SOLUTION: A through-bolt 6 is formed to be hollow, and its inside 20 is communicated with a pump casing 3 to pass a part of liquid flowing in a pump. Alternatively, the portion of the through-bolt 6 having no screw thread is enveloped by a water jacket, the internal space of the water jacket and the pump casing 3 are communicated with each other, and thus a part of the liquid flowing the pump is passed.
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