Precision Filtration Systems

They primarily remove liquid water, oil mist, solid particles (such as rust and dust), and some gaseous oil vapors. Through multi-stage filtration combinations, they effectively reduce oil, dust, and water content, providing a clean air supply for downstream equipment and processes.

There are three main indicators: ① A significant increase in the pressure differential across the filter (usually ≥0.07 MPa), indicating the element is clogged; ② The recommended replacement interval has been reached (typically 6–12 months, depending on operating conditions); ③ A decline in air quality at the outlet, such as the appearance of "fish-eyes" (craters) during spraying or frequent malfunctions in pneumatic equipment. It is recommended to base the decision primarily on the pressure differential reading while also considering actual usage time.

Selection is generally based on the compressed air quality requirements of the equipment: for standard pneumatic tools and blow-off applications, 3μm or 1μm grades are sufficient; for demanding applications like spraying, precision instrumentation, and electronics manufacturing, a 0.01μm high-efficiency grade is recommended; for food, pharmaceutical, and ultra-precision applications, an activated carbon filter can be added downstream of the high-efficiency filter to further remove oil vapors and meet oil-free and odorless standards.

Precision filters primarily remove liquid water and solid particles but cannot remove gaseous water vapor. If the process requires a specific compressed air dew point (e.g., applications requiring dry, water-free air), a refrigerated dryer or desiccant dryer must be installed. The dryer removes gaseous moisture, while the filter removes liquid water, oil mist, and particles; their functions complement each other to ensure high-quality compressed air.