... .high efficiency 3.long life blower 4.make the output water clean without any oil-dust and ordor 1. Low noise ... to the direction of spiral line, all these prevent the pulse noise and vibration. What's more, by using the Impedance ... . Widely used in many fields, especially in gas transportation, waste water treatment, aquaculture, pneumatic transport, vacuum packing, oxygen generation, etc. 14 ...