Passive exhaust valve with floating spring stop

A passive exhaust valve assembly includes an exhaust conduit or pipe section with a valve plate or vane member that can pivot within the interior section or volume of the exhaust conduit to regulate the flow of exhaust gases through the exhaust conduit. A flexible bumper element, such as a metal mesh pad, may be positioned on the interior surface of the exhaust conduit, such that an end portion ofthe valve plate may contact the mesh pad in the closed position. The bumper element may be disposed in a recessed pocket or depression and may be biased inward, such as with a spring, for the end portion of the valve plate to contact the bumper element as it moves toward the closed position, and thereby gradually reduce the closure speed of the valve plate to the closed position. 种被动排出阀组件，包括排出管道或管区段，具有阀板或叶片构件，该阀板或叶片构件可以在排出管道的内部区段或容积内枢转，以调节通过排出管道的排出气体的流。柔性可弯曲缓冲器元件，诸如金属网垫，可以定位在排出管道的内表面上，使得阀板的端部部分可以在关闭位置接触网垫。缓冲器元件可以设置在凹陷的袋状物或凹陷部中并且可以向内偏压，诸如使用弹簧，以使阀板的端部部分在阀板朝向关闭位置移动时接触缓冲器元件，并且由此逐渐减小阀板到关闭位置的闭合速度。