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Drum type PB integrated exhaust muffler, exhaust steam (gas) are the most reasonable design principle of muffler muffler. High pressure steam in the silencer through a flow control in Buck body, large volume again after expansion buck, leading to the formation of low pressure steam jet, in the process steam flow mechanical energy into certain frequencies of sound, the noise while the power is weakened, but often because of exhaust steam deviate from the designed value and many other reasons, the exhaust noise is still higher than the standard value.