Abstract: This invention provides a new low vacuum oil/water mixture liquid separation method and an improved oil purification device for oil/water separation. Fully diffused purified gas is introduced into an oil/water mixture liquid in a low vacuum container, enabling the liquid to produce concentrated micro fine gas bubbles, enabling in the liquid to be in a state of gas/liquid two-phase mixture. This greatly increases the surface area of the oil/water mixture liquid, speeding up the oil/water separation. This invention provides an oil/water separation rate ten times higher than that of the conventional method. This invention is not only suitable for the purification of new oil, but is adequate in the recovery, regeneration and purification of various waste lubrication oils, hydraulic oils, and transformer oils.

Abstract: This invention relates to the method and apparatus for eliminating cavitation in the hydraulic system. In the hydraulic fluid there is great difference between the seperating pressure of the air, water content and volatile substance from said fluid and the saturated vapor pressure of said fluid. With the heating method and vacuumizing technique, the air, water content and volatile substance in said hydraulic fluid which are sealed in a tank may be seperated and exhausted. With the changing of volume changeable device, the working fluid is pressurized up to the operating pressure. The apparatus designed according to this invention may be used either a movable pre-treatment device to replace the working fluid in the hydraulic system or an independent hydraulic pump station.