Low oil content filtering system: superior quality components of oil and gas separation and gas, liquid components to ensure units under various conditions in the safe, reliable and stable to provide high-quality compressed air. Gas separation device of its kind screw oil filtering unit area than doubled in size, lower air flow rate increased separation, oil and gas company barrel components using original second reflow technology to further reduce air flow, so that a better separation effect, export compression air-oil content is less than 3ppm. Gas separation device lifetime.