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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 Second, public security, transportation, industry and commerce, taxation, forestry, animal husbandry and other departments need in provincial roads, county roads, and adjacent to the border provinces (autonomous regions) of setting up checkpoints on roads (card), must be approved by the provincial people's government. The checkpoints (CARDS) set by local and local departments are illegal, and people and vehicle drivers may refuse to accept their inspection.

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