| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust valve device which suppresses slapping sound of a valve body with a valve seating and improves its durability.SOLUTION: An exhaust valve device includes: a valve body 4 opened and closed according to pressure of exhaust gas; a valve seating 9 with which the valve body 4 contacts when the valve body 4 is closed; a biasing means 5 for biasing the valve body 4 toward its closing side; and a biasing force reducing means 6 elastically deforming and reducing a biasing force generated by the biasing means 5 when an opening degree of the valve body 4 is a predetermined opening degree or smaller, which is larger than an opening degree by which the opening degree of the valve body 4 closes the valve body 4. |
