De-oiling under vacuum
In this process, the components to be cleaned are placed in a vacuum chamber and heated by radiant heaters. The process temperature and pressure are adjusted so that any contamination on the components is vaporized.
In this process, the work piece is blow dried with a side channel blower. The flow volume and pressure of the air stream are critical for the degree of dryness. The temperature of the air stream also contributes to the effectiveness of the drying process.
Flood injection washing under vacuum
In this process, the air is first evacuated from the washing chamber. A pressurized injection fluid wash (16 bar) also cleans hidden hollow passages and undercuts.
Blowers in vacuum operation are used with a primary pump in order to deposit a metalic coating on the car lights.
With vacuum drying, difficult spots such as blind bore holes, narrow lubrication channels and even internal passage ways can be dried completely, with no residual water remaining in voids or uneven surfaces. In this process, a vacuum is created in the washing chamber. When the pressure drops below that of the vapor pressure of the fluid to be removed, the fluid evaporates and the parts are dried. Most of the vapor removed is trapped in a condensate separator upstream of the vacuum pump. The residual vapor in the air is eliminated by the vacuum pump.
Depending on how dirty the parts are, a water or solvent based detergent is employed. In some cases ATEX approved vacuum pumps are required for solvent based detergents, which may be explosive in nature.