| 摘要 |
PROBLEM TO BE SOLVED: To provide a throttle valve device having a simple structure, allowed to be manufactured at low cost and having high quietness.SOLUTION: In a throttle valve device (1) including a valve seat member (10) on which a valve seat part (10a) is formed and a valve body (20) to be attached/detached to/from the valve seat part (10a), a fluid passage (30A) for passing fluid between the valve seat member (10) and the valve body (20) in an abutted state of the valve body (20) on the valve seat part (10a) is formed between the valve seat member (10) and the valve body (20), a cross section contraction part for continuously reducing a cross-sectional area from the upstream side of the fluid passage (30A) to the downstream side is formed at least on a part of the fluid passage (30A), a fluid guide part (22) for guiding the fluid passed through the fluid passage (30A) is formed on the downstream side of the fluid passage (30A), and the fluid guide part has a passage cross-sectional area not less than a minimum passage cross-sectional area of the cross section contraction part of the fluid passage (30A). |
