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Germany invited industry representatives, EU officials invite aviation experts to Berlin to go over launching regulations for air travel. Iceland’s major air-ports were closed after shifting winds blew the ash cloud toward the Reykjavik the first time. The airspace closure lasting for the week because of the ash threat to flight creates the worst breakdown in civil aviation in Europe. Over 100000 flights were canceled. Airlines on target lose more fat than 2 billion dollars. Principle: resulting in differential pressure. By differential pressure switch monitoring in and out of the nozzle pressure difference of change, when the differential pressure to set data, control device for hydraulic control valves, motor drive signal, caused by the following action: motor driving brush rotation, the filter cleaning, emission control valve to open at the same time, the whole cleaning process for dozens of seconds, at the end of the automatic brush filter when cleaning, close the valve, the motor stop running, system back to its initial state, began to filter into the next process

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