Exhaust device of boat

An exhaust device for a boat, the boat including a boat body having a hull that forms a boat bottom and a deck that covers the hull, and an engine that is arranged inside the boat body, said exhaust device comprising:

• an exhaust pipe that leads exhaust gas generated by the engine to the outside of the boat body;
• and
• an open/close valve mounted on an outlet of the exhaust pipe, the open/close valve including a valve casing and a valve element that is tiltably mounted on the valve casing, the valve casing including a cylindrical portion that extends vertically, a through hole formed in a bottom of the cylindrical portion, and an exhaust inlet formed in an upper portion of the cylindrical portion, and the valve element including a sealing plate having a size that allows the sealing plate to close the through hole, an arm portion that extends from the sealing plate to allow the sealing plate to tilt, and a tilting support shaft provided on the arm portion at a position where a center of gravity of the valve element at a valve opened position and a valve closed position is offset from a horizontal line passing through a support shaft that tiltably supports the valve element,
• wherein when the hull is arranged below the deck, the exhaust gas that enters the valve casing through the exhaust inlet is discharged to the outside of the valve casing through the through hole, and when the hull is arranged above the deck, the sealing plate of the valve element is tilted due to gravity to close the through hole.

An exhaust device for a boat, the boat including a boat body having a hull that forms a boat bottom and a deck that covers the hull, and an engine that is arranged inside the boat body, said exhaust device comprising:

• an exhaust pipe that leads exhaust gas generated by the engine to the outside of the boat body;
• and
• an open/close valve mounted on an outlet of the exhaust pipe, the open/close valve including a valve casing and a valve element that is movable with respect to the valve casing, the valve element including a sealing plate that is movable by gravity to open and close the open/close valve,
• wherein when the hull is arranged below the deck, the exhaust gas that enters the valve casing through the exhaust inlet is discharged to the outside of the valve casing, and when the hull is arranged above the deck, the sealing plate of the valve element is moved due to gravity to close the open/close valve to prevent discharge of exhaust gas outside of the valve casing.