When the medium flows import , by placing the tube in the filter, to remove solid impurities , the liquid passed through the filter assembly , the change in direction of liquid flow , the liquid portion of the free gas and the full separation of dissolved gases , the gas up to the separator at the top , forming gas space , oil and gas interface appears . With gas increases , the pressure increases , the volume increase, oil and gas interface drop down to a certain extent the current float device moves to open the gas valve exclusion , rising oil and gas interface , the gas space narrowing float device off valve, which a process to make oil, gas, solid three separate , enabling the liquid cool down and filtering capabilities.