| 摘要 |
PROBLEM TO BE SOLVED: To provide a butterfly opening/closing valve which can heat or cool substantially across the whole housing or disk-like valve body.SOLUTION: A butterfly opening/closing valve V has a disk-like valve body for opening/closing a flow passage provided in a housing 1. In the butterfly opening/closing valve V, a heat medium passage 3 is provided for flowing a cooling medium or a heating medium substantially across the whole inside of the housing 1 or substantially across the whole surface of the housing 1 for cooling or heating the housing 1.SELECTED DRAWING: Figure 3 |
