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DCP-500B Vacuum packing machine operation principle is the same as general volume pump. It by one with rotate axle install but in partial rotor of position make up in the body in pump with one heart, rotor have three blade that radial slip, it separate and succeed 3 operating rooms the pump, the mouth is entered to pump the gas and breathe in by oneself. Against stopping the valve and filtering the network to enter the pump room through being open.