Exhaust valve

The valve casing has a funnel or cup-shaped deep-drawn metal sheet construction, with openings (17, 18) at the narrow and wider ends. A separate flange plate (19) covers and seals the wider end (18) where it is fastened. This plate includes two (14, 15) of the three openings (13, 14, 15). An internal valve flap swings between valve seats connected to these openings (14, 15).