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The function of the gas distribution mechanism is in accordance with the requirements of the working cycle of the diesel engine, open and close the exhaust valve regularly, make the fresh air enter the cylinder at the right time, exhaust gas out of the cylinder in time, and compress the inlet and exhaust doors on the corresponding seat in the compression and work stroke, seal into, exhaust the airways without air leakage and ensure the fuel in the cylinder. Mixing and burning with air efficiently.