ZJD series oil purifier are suitable especially for purifying and restoring hydraulic oil, machine oil, gear oil, coolant oil and various other lubrication oil. The most breakdown of machinery which has lubrication oil system results from contaminated lubrication in which has water, gas, impurities etc. ZJD series can rapidly remove water, gas, particulate matters and impurities from lubrication oil and improve properties of lubricating oil so as to greatly extend lifetime of machinery which has lubrication system.