... after degassing of oil into the regenerator through the high-precision filters, filter out particulate impurities into the ... observation holes, defoaming device, Liquid level control, discharged pumps, condensers, vacuum pumps, electrical control cabinet, control instrumentation, and piping system, ... /T429ParticleNAS≤5DS/T313 Standard Double-stage High-Efficiency Vacuum Insulation Oil Purifier Plant