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For the gas in the pipeline, whether it is a multi-stage water column, the air column is phased, there is no pressure or pressure can be discharged at high speed continuously, the float is not on the exhaust port, there is no problem of jamming, a small amount of gas can be discharged through microholes, the pipeline can be injected when there is negative pressure, anti-gas staining and buffering the water hammer boost, relieving the danger of new pipeline test run, exhaust difficulty, Reduce pipe burst accidents in urban pipe networks, reduce resistance and energy saving, reduce pressure oscillation, and improve the safety and reliability of the entire water supply system and various equipment.